Some missing IdResolvers, added scope attributes to all

@JsonIdentityInfo annoations

ccm-cms/src/main/java/org/librecms/assets/ContactableEntity.java

@@ -52,7 +52,8 @@ import static org.librecms.CmsConstants.*;
 @JsonIdentityInfo(
     generator = ObjectIdGenerators.PropertyGenerator.class,
     resolver = ContactableEntityIdResolver.class,
-    property = "uuid"
+    property = "uuid",
+    scope = ContactableEntity.class
 )
 public class ContactableEntity extends Asset {
 

ccm-cms/src/main/java/org/librecms/assets/Organization.java

@@ -56,7 +56,8 @@ import static org.librecms.assets.AssetConstants.*;
 @JsonIdentityInfo(
     generator = ObjectIdGenerators.PropertyGenerator.class,
     resolver = OrganizationIdResolver.class,
-    property = "uuid"
+    property = "uuid",
+    scope = Organization.class
 )
 public class Organization extends ContactableEntity {
 

ccm-cms/src/main/java/org/librecms/assets/Person.java

@@ -18,7 +18,6 @@
  */
 package org.librecms.assets;
 
-
 import com.fasterxml.jackson.annotation.JsonIdentityInfo;
 import com.fasterxml.jackson.annotation.ObjectIdGenerators;
 import org.hibernate.envers.Audited;
@@ -71,7 +70,8 @@ import static org.librecms.assets.AssetConstants.*;
 @JsonIdentityInfo(
     generator = ObjectIdGenerators.PropertyGenerator.class,
     resolver = PersonIdResolver.class,
-    property = "uuid"
+    property = "uuid",
+    scope = Person.class
 )
 public class Person extends ContactableEntity {
 

ccm-cms/src/main/java/org/librecms/assets/PostalAddress.java

@@ -57,7 +57,8 @@ import static org.librecms.assets.AssetConstants.ASSETS_BUNDLE;
 @JsonIdentityInfo(
     generator = ObjectIdGenerators.PropertyGenerator.class,
     resolver = PostalAddressIdResolver.class,
-    property = "uuid"
+    property = "uuid",
+    scope = PostalAddress.class
 )
 public class PostalAddress extends Asset {
 

ccm-cms/src/main/java/org/librecms/contentsection/ContentItem.java

@@ -580,7 +580,8 @@ import javax.xml.bind.annotation.XmlElementWrapper;
 @JsonIdentityInfo(
     generator = ObjectIdGenerators.PropertyGenerator.class,
     resolver = ContentItemIdResolver.class,
-    property = "uuid"
+    property = "uuid",
+    scope = ContentItem.class
 )
 public class ContentItem extends CcmObject implements Serializable, Exportable {
 

ccm-cms/src/main/java/org/librecms/contentsection/ContentType.java

@@ -80,7 +80,8 @@ import static org.librecms.CmsConstants.*;
 @JsonIdentityInfo(
     generator = ObjectIdGenerators.PropertyGenerator.class,
     resolver = ContentTypeIdResolver.class,
-    property = "uuid"
+    property = "uuid",
+    scope = ContentType.class
 )
 public class ContentType extends CcmObject implements Serializable {
 

ccm-cms/src/main/java/org/librecms/contentsection/Folder.java

@@ -310,7 +310,8 @@ import static org.librecms.CmsConstants.*;
 @JsonIdentityInfo(
     generator = ObjectIdGenerators.PropertyGenerator.class,
     resolver = FolderIdResolver.class,
-    property = "uuid"
+    property = "uuid",
+    scope = Folder.class
 )
 public class Folder extends Category implements Serializable {
 

ccm-cms/src/main/java/org/librecms/lifecycle/Lifecycle.java

@@ -66,7 +66,8 @@ import static org.librecms.CmsConstants.*;
 @JsonIdentityInfo(
     generator = ObjectIdGenerators.PropertyGenerator.class,
     resolver = LifecycleIdResolver.class,
-    property = "uuid"
+    property = "uuid",
+    scope = Lifecycle.class
 )
 public class Lifecycle implements Exportable, Identifiable, Serializable {
 

ccm-cms/src/main/java/org/librecms/lifecycle/LifecycleDefinition.java

@@ -65,7 +65,8 @@ import static org.librecms.CmsConstants.*;
 @JsonIdentityInfo(
     generator = ObjectIdGenerators.PropertyGenerator.class,
     resolver = LifecycleDefinitionIdResolver.class,
-    property = "uuid"
+    property = "uuid",
+    scope = LifecycleDefinition.class
 )
 public class LifecycleDefinition 
     implements Identifiable, Exportable, Serializable {

ccm-cms/src/main/java/org/librecms/lifecycle/Phase.java

@@ -58,7 +58,8 @@ import static org.librecms.CmsConstants.*;
 @JsonIdentityInfo(
     generator = ObjectIdGenerators.PropertyGenerator.class,
     resolver = PhaseIdResolver.class,
-    property = "uuid"
+    property = "uuid",
+    scope = Phase.class
 )
 public class Phase implements Exportable, Serializable {
 

ccm-cms/src/main/java/org/librecms/lifecycle/PhaseDefinition.java

@@ -57,7 +57,8 @@ import static org.librecms.CmsConstants.*;
 @JsonIdentityInfo(
     generator = ObjectIdGenerators.PropertyGenerator.class,
     resolver = PhaseDefinitionIdResolver.class,
-    property = "uuid"
+    property = "uuid",
+    scope = PhaseDefinition.class
 )
 public class PhaseDefinition implements Exportable, Serializable {
 

ccm-core/src/main/java/org/libreccm/categorization/Categorization.java

@@ -104,7 +104,9 @@ import javax.persistence.Table;
 })
 @JsonIdentityInfo(
     generator = ObjectIdGenerators.PropertyGenerator.class,
-    property = "uuid"
+    resolver = CategorizationIdResolver.class,
+    property = "uuid",
+    scope = Categorization.class
 )
 public class Categorization implements Serializable, Relation, Exportable {
 

ccm-core/src/main/java/org/libreccm/categorization/CategorizationIdResolver.java

@@ -0,0 +1,51 @@
+package org.libreccm.categorization;
+
+import com.fasterxml.jackson.annotation.ObjectIdGenerator;
+import com.fasterxml.jackson.annotation.ObjectIdResolver;
+import org.libreccm.cdi.utils.CdiUtil;
+
+import java.io.Serializable;
+
+/**
+ *
+ * @author <a href="mailto:jens.pelzetter@googlemail.com">Jens Pelzetter</a>
+ */
+public class CategorizationIdResolver implements ObjectIdResolver, Serializable{
+    
+    private static final long serialVersionUID = 1L;
+    
+     @Override
+    public void bindItem(
+        final ObjectIdGenerator.IdKey id, final Object object
+    ) {
+        // According to the Jackson JavaDoc, this method can be used to keep
+        // track of objects directly in a resolver implementation. We don't need
+        // this here therefore this method is empty.
+    }
+    
+     @Override
+    public Object resolveId(final ObjectIdGenerator.IdKey id) {
+        return CdiUtil
+            .createCdiUtil()
+            .findBean(CategorizationRepository.class)
+            .findByUuid(id.key.toString())
+            .orElseThrow(
+                () -> new IllegalArgumentException(
+                    String.format(
+                        "No Categorization with UUID %s in the database.",
+                        id.key.toString()
+                    )
+                )
+            );
+    }
+    
+     @Override
+    public ObjectIdResolver newForDeserialization(final Object context) {
+        return new CategorizationIdResolver();
+    }
+
+    @Override
+    public boolean canUseFor(final ObjectIdResolver resolverType) {
+        return resolverType instanceof CategorizationIdResolver;
+    }
+}

ccm-core/src/main/java/org/libreccm/categorization/CategorizationRepository.java

@@ -0,0 +1,54 @@
+package org.libreccm.categorization;
+
+import org.libreccm.core.AbstractEntityRepository;
+
+import java.util.Optional;
+
+import javax.persistence.NoResultException;
+
+/**
+ *
+ * @author <a href="mailto:jens.pelzetter@googlemail.com">Jens Pelzetter</a>
+ */
+public class CategorizationRepository
+    extends AbstractEntityRepository<Long, Categorization> {
+
+    private static final long serialVersionUID = 1L;
+
+    @Override
+    public Class<Categorization> getEntityClass() {
+        return Categorization.class;
+    }
+
+    @Override
+    public String getIdAttributeName() {
+        return "categorizationId";
+    }
+
+    @Override
+    public Long getIdOfEntity(final Categorization entity) {
+        return entity.getCategorizationId();
+    }
+
+    @Override
+    public boolean isNew(final Categorization entity) {
+        return entity.getCategorizationId()== 0;
+    }
+
+    public Optional<Categorization> findByUuid(final String uuid) {
+        try {
+            return Optional.of(
+                getEntityManager()
+                    .createNamedQuery(
+                        "Categorization.findByUuid",
+                        Categorization.class
+                    )
+                    .setParameter("uuid", uuid)
+                    .getSingleResult()
+            );
+        } catch (NoResultException ex) {
+            return Optional.empty();
+        }
+    }
+
+}

ccm-core/src/main/java/org/libreccm/categorization/Category.java

@@ -138,7 +138,8 @@ import javax.validation.constraints.NotBlank;
 @JsonIdentityInfo(
     generator = ObjectIdGenerators.PropertyGenerator.class,
     resolver = CategoryIdResolver.class,
-    property = "uuid"
+    property = "uuid",
+    scope = Category.class
 )
 public class Category extends CcmObject implements Serializable, Exportable {
 

ccm-core/src/main/java/org/libreccm/categorization/Domain.java

@@ -133,9 +133,12 @@ import javax.validation.constraints.NotBlank;
     )
 })
 @XmlRootElement(name = "domain", namespace = CAT_XML_NS)
-@JsonIdentityInfo(generator = ObjectIdGenerators.PropertyGenerator.class,
-                  resolver = DomainIdResolver.class,
-                  property = "uuid")
+@JsonIdentityInfo(
+    generator = ObjectIdGenerators.PropertyGenerator.class,
+    resolver = DomainIdResolver.class,
+    property = "uuid",
+    scope = Domain.class
+)
 public class Domain extends CcmObject implements Serializable, Exportable {
 
     private static final long serialVersionUID = 4012590760598188732L;

ccm-core/src/main/java/org/libreccm/categorization/DomainOwnership.java

@@ -68,8 +68,12 @@ import javax.xml.bind.annotation.XmlElement;
         query = "SELECT o FROM DomainOwnership o "
                     + "WHERE o.owner = :owner AND o.domain = :domain")
 })
-@JsonIdentityInfo(generator = ObjectIdGenerators.PropertyGenerator.class,
-                  property = "uuid")
+@JsonIdentityInfo(
+    generator = ObjectIdGenerators.PropertyGenerator.class,
+    property = "uuid",
+    resolver = DomainOwnershipIdResolver.class,
+    scope = DomainOwnership.class
+)
 public class DomainOwnership implements Serializable, Exportable {
 
     private static final long serialVersionUID = 201504301305L;

ccm-core/src/main/java/org/libreccm/categorization/DomainOwnershipIdResolver.java

@@ -0,0 +1,51 @@
+package org.libreccm.categorization;
+
+import com.fasterxml.jackson.annotation.ObjectIdGenerator;
+import com.fasterxml.jackson.annotation.ObjectIdResolver;
+import org.libreccm.cdi.utils.CdiUtil;
+
+import java.io.Serializable;
+
+/**
+ *
+ * @author <a href="mailto:jens.pelzetter@googlemail.com">Jens Pelzetter</a>
+ */
+public class DomainOwnershipIdResolver implements ObjectIdResolver, Serializable{
+    
+    private static final long serialVersionUID = 1L;
+    
+     @Override
+    public void bindItem(
+        final ObjectIdGenerator.IdKey id, final Object object
+    ) {
+        // According to the Jackson JavaDoc, this method can be used to keep
+        // track of objects directly in a resolver implementation. We don't need
+        // this here therefore this method is empty.
+    }
+    
+     @Override
+    public Object resolveId(final ObjectIdGenerator.IdKey id) {
+        return CdiUtil
+            .createCdiUtil()
+            .findBean(DomainOwnershipRepository.class)
+            .findByUuid(id.key.toString())
+            .orElseThrow(
+                () -> new IllegalArgumentException(
+                    String.format(
+                        "No DomainOwnership with UUID %s in the database.",
+                        id.key.toString()
+                    )
+                )
+            );
+    }
+    
+     @Override
+    public ObjectIdResolver newForDeserialization(final Object context) {
+        return new DomainOwnershipIdResolver();
+    }
+
+    @Override
+    public boolean canUseFor(final ObjectIdResolver resolverType) {
+        return resolverType instanceof DomainOwnershipIdResolver;
+    }
+}

ccm-core/src/main/java/org/libreccm/categorization/DomainOwnershipRepository.java

@@ -0,0 +1,54 @@
+package org.libreccm.categorization;
+
+import org.libreccm.core.AbstractEntityRepository;
+
+import java.util.Optional;
+
+import javax.persistence.NoResultException;
+
+/**
+ *
+ * @author <a href="mailto:jens.pelzetter@googlemail.com">Jens Pelzetter</a>
+ */
+public class DomainOwnershipRepository
+    extends AbstractEntityRepository<Long, DomainOwnership> {
+
+    private static final long serialVersionUID = 1L;
+
+    @Override
+    public Class<DomainOwnership> getEntityClass() {
+        return DomainOwnership.class;
+    }
+
+    @Override
+    public String getIdAttributeName() {
+        return "ownershipId";
+    }
+
+    @Override
+    public Long getIdOfEntity(final DomainOwnership entity) {
+        return entity.getOwnershipId();
+    }
+
+    @Override
+    public boolean isNew(final DomainOwnership entity) {
+        return entity.getOwnershipId()== 0;
+    }
+
+    public Optional<DomainOwnership> findByUuid(final String uuid) {
+        try {
+            return Optional.of(
+                getEntityManager()
+                    .createNamedQuery(
+                        "DomainOwnership.findByUuid",
+                        DomainOwnership.class
+                    )
+                    .setParameter("uuid", uuid)
+                    .getSingleResult()
+            );
+        } catch (NoResultException ex) {
+            return Optional.empty();
+        }
+    }
+
+}

ccm-core/src/main/java/org/libreccm/core/CcmObject.java

@@ -90,9 +90,12 @@ import javax.persistence.Table;
 //persistence system we can't yet refactor it to make PMD happy. Also I think
 //this is a false warning.
 @SuppressWarnings("PMD.TooManyMethods")
-@JsonIdentityInfo(generator = ObjectIdGenerators.PropertyGenerator.class,
-                  resolver = CcmObjectIdResolver.class,
-                  property = "uuid")
+@JsonIdentityInfo(
+    generator = ObjectIdGenerators.PropertyGenerator.class,
+    resolver = CcmObjectIdResolver.class,
+    property = "uuid",
+    scope = CcmObject.class
+)
 public class CcmObject implements Exportable, Identifiable, Serializable {
 
     private static final long serialVersionUID = 201504261329L;

ccm-core/src/main/java/org/libreccm/core/Resource.java

@@ -69,12 +69,14 @@ import javax.persistence.TemporalType;
 @Entity
 @Table(name = "RESOURCES", schema = DB_SCHEMA)
 @NamedQueries({
-        @NamedQuery(name = "Resource.findByUuid",
-                query = "SELECT r FROM Resource r WHERE r.uuid = :uuid"),
-})
-@JsonIdentityInfo(generator = ObjectIdGenerators.PropertyGenerator.class,
-                  resolver = ResourceIdResolver.class,
-                  property = "uuid")
+    @NamedQuery(name = "Resource.findByUuid",
+                query = "SELECT r FROM Resource r WHERE r.uuid = :uuid"),})
+@JsonIdentityInfo(
+    generator = ObjectIdGenerators.PropertyGenerator.class,
+    resolver = ResourceIdResolver.class,
+    property = "uuid",
+    scope = Resource.class
+)
 public class Resource extends CcmObject implements Serializable, Exportable {
 
     private static final long serialVersionUID = 7345482620613842781L;

ccm-core/src/main/java/org/libreccm/core/ResourceType.java

@@ -60,14 +60,16 @@ import javax.persistence.Table;
 @Inheritance(strategy = InheritanceType.JOINED)
 @NamedQueries({
     @NamedQuery(name = "ResourceType.findByUuid",
-                query = "SELECT r FROM ResourceType r WHERE r.uuid = :uuid")
-    ,
-        @NamedQuery(name = "ResourceType.findByTitle",
+                query = "SELECT r FROM ResourceType r WHERE r.uuid = :uuid"),
+    @NamedQuery(name = "ResourceType.findByTitle",
                 query = "SELECT r FROM ResourceType r WHERE r.title = :title")
 })
-@JsonIdentityInfo(generator = ObjectIdGenerators.PropertyGenerator.class,
-                  resolver = ResourceTypeIdResolver.class,
-                  property = "uuid")
+@JsonIdentityInfo(
+    generator = ObjectIdGenerators.PropertyGenerator.class,
+    resolver = ResourceTypeIdResolver.class,
+    property = "uuid",
+    scope = ResourceType.class
+)
 @SuppressWarnings({"PMD.CyclomaticComplexity",
                    "PMD.StdCyclomaticComplexity",
                    "PMD.ModifiedCyclomaticComplexity",

ccm-core/src/main/java/org/libreccm/security/Group.java

@@ -66,18 +66,15 @@ import javax.persistence.Table;
     @NamedQuery(
         name = "Group.findByName",
         query = "SELECT g FROM Group g WHERE g.name = :name "
-                    + "ORDER BY g.name")
-    ,
+                    + "ORDER BY g.name"),
     @NamedQuery(
         name = "Group.searchByName",
         query = "SELECT g FROM Group g "
                     + "WHERE LOWER(g.name) LIKE CONCAT(LOWER(:name), '%') "
-                    + "ORDER BY g.name")
-    ,
+                    + "ORDER BY g.name"),
     @NamedQuery(
         name = "Group.findAllOrderedByGroupName",
-        query = "SELECT g FROM Group g ORDER BY g.name")
-    ,
+        query = "SELECT g FROM Group g ORDER BY g.name"),
     @NamedQuery(
         name = "Group.findByMember",
         query = "SELECT g FROM Group g "
@@ -89,8 +86,7 @@ import javax.persistence.Table;
     @NamedEntityGraph(
         name = "Group.withMembersAndRoleMemberships",
         attributeNodes = {
-            @NamedAttributeNode(value = "memberships")
-            ,
+            @NamedAttributeNode(value = "memberships"),
             @NamedAttributeNode(value = "roleMemberships",
                                 subgraph = "role")},
         subgraphs = {
@@ -99,8 +95,7 @@ import javax.persistence.Table;
                 attributeNodes = {
                     @NamedAttributeNode(value = "role",
                                         subgraph = "permissions")
-                })
-            ,
+                }),
             @NamedSubgraph(
                 name = "permissions",
                 attributeNodes = {
@@ -108,9 +103,12 @@ import javax.persistence.Table;
         })
 })
 @XmlRootElement(name = "user-group", namespace = CORE_XML_NS)
-@JsonIdentityInfo(generator = ObjectIdGenerators.PropertyGenerator.class,
-                  resolver = GroupIdResolver.class,
-                  property = "uuid")
+@JsonIdentityInfo(
+    generator = ObjectIdGenerators.PropertyGenerator.class,
+    resolver = GroupIdResolver.class,
+    property = "uuid",
+    scope = Group.class
+)
 public class Group extends Party implements Serializable, Exportable {
 
     private static final long serialVersionUID = -4800759206452780739L;

ccm-core/src/main/java/org/libreccm/security/GroupMembership.java

@@ -73,7 +73,9 @@ import javax.persistence.Table;
 @XmlRootElement(name = "group-membership", namespace = CORE_XML_NS)
 @JsonIdentityInfo(
     generator = ObjectIdGenerators.PropertyGenerator.class,
-    property = "uuid"
+    property = "uuid",
+    resolver = GroupMembershipIdResolver.class,
+    scope = GroupMembership.class
 )
 public class GroupMembership implements Serializable, Exportable {
 

ccm-core/src/main/java/org/libreccm/security/GroupMembershipIdResolver.java

@@ -0,0 +1,51 @@
+package org.libreccm.security;
+
+import com.fasterxml.jackson.annotation.ObjectIdGenerator;
+import com.fasterxml.jackson.annotation.ObjectIdResolver;
+import org.libreccm.cdi.utils.CdiUtil;
+
+import java.io.Serializable;
+
+/**
+ *
+ * @author <a href="mailto:jens.pelzetter@googlemail.com">Jens Pelzetter</a>
+ */
+public class GroupMembershipIdResolver implements ObjectIdResolver, Serializable{
+    
+    private static final long serialVersionUID = 1L;
+    
+     @Override
+    public void bindItem(
+        final ObjectIdGenerator.IdKey id, final Object object
+    ) {
+        // According to the Jackson JavaDoc, this method can be used to keep
+        // track of objects directly in a resolver implementation. We don't need
+        // this here therefore this method is empty.
+    }
+    
+     @Override
+    public Object resolveId(final ObjectIdGenerator.IdKey id) {
+        return CdiUtil
+            .createCdiUtil()
+            .findBean(GroupMembershipRepository.class)
+            .findByUuid(id.key.toString())
+            .orElseThrow(
+                () -> new IllegalArgumentException(
+                    String.format(
+                        "No GroupMembership with UUID %s in the database.",
+                        id.key.toString()
+                    )
+                )
+            );
+    }
+    
+     @Override
+    public ObjectIdResolver newForDeserialization(final Object context) {
+        return new GroupMembershipIdResolver();
+    }
+
+    @Override
+    public boolean canUseFor(final ObjectIdResolver resolverType) {
+        return resolverType instanceof GroupMembershipIdResolver;
+    }
+}

ccm-core/src/main/java/org/libreccm/security/GroupMembershipRepository.java

@@ -0,0 +1,54 @@
+package org.libreccm.security;
+
+import org.libreccm.core.AbstractEntityRepository;
+
+import java.util.Optional;
+
+import javax.persistence.NoResultException;
+
+/**
+ *
+ * @author <a href="mailto:jens.pelzetter@googlemail.com">Jens Pelzetter</a>
+ */
+public class GroupMembershipRepository
+    extends AbstractEntityRepository<Long, GroupMembership> {
+
+    private static final long serialVersionUID = 1L;
+
+    @Override
+    public Class<GroupMembership> getEntityClass() {
+        return GroupMembership.class;
+    }
+
+    @Override
+    public String getIdAttributeName() {
+        return "membershipId";
+    }
+
+    @Override
+    public Long getIdOfEntity(final GroupMembership entity) {
+        return entity.getMembershipId();
+    }
+
+    @Override
+    public boolean isNew(final GroupMembership entity) {
+        return entity.getMembershipId() == 0;
+    }
+
+    public Optional<GroupMembership> findByUuid(final String uuid) {
+        try {
+            return Optional.of(
+                getEntityManager()
+                    .createNamedQuery(
+                        "GroupMembership.findByUuid",
+                        GroupMembership.class
+                    )
+                    .setParameter("uuid", uuid)
+                    .getSingleResult()
+            );
+        } catch (NoResultException ex) {
+            return Optional.empty();
+        }
+    }
+
+}

ccm-core/src/main/java/org/libreccm/security/Party.java

@@ -89,9 +89,12 @@ import javax.persistence.Table;
                       attributeNodes = @NamedAttributeNode(
                           value = "roleMemberships"))
 })
-@JsonIdentityInfo(generator = ObjectIdGenerators.PropertyGenerator.class,
-                  resolver = PartyIdResolver.class,
-                  property = "uuid")
+@JsonIdentityInfo(
+    generator = ObjectIdGenerators.PropertyGenerator.class,
+    resolver = PartyIdResolver.class,
+    property = "uuid",
+    scope = Party.class
+)
 public class Party implements Serializable {
 
     private static final long serialVersionUID = 3319997992281332204L;

ccm-core/src/main/java/org/libreccm/security/Permission.java

@@ -105,9 +105,12 @@ import javax.persistence.TemporalType;
 })
 @XmlRootElement(name = "permission", namespace = CORE_XML_NS)
 @XmlAccessorType(XmlAccessType.FIELD)
-@JsonIdentityInfo(generator = ObjectIdGenerators.PropertyGenerator.class,
-                  resolver = PermissionIdResolver.class,
-                  property = "uuid")
+@JsonIdentityInfo(
+    generator = ObjectIdGenerators.PropertyGenerator.class,
+    resolver = PermissionIdResolver.class,
+    property = "uuid",
+    scope = Permission.class
+)
 public class Permission implements Serializable, Exportable {
 
     private static final long serialVersionUID = -5178045844045517958L;

ccm-core/src/main/java/org/libreccm/security/Role.java

@@ -75,55 +75,45 @@ import javax.xml.bind.annotation.XmlRootElement;
                 query = "SELECT r FROM Role r WHERE r.uuid = :uuid"),
     @NamedQuery(name = "Role.findByName",
                 query = "SELECT r FROM Role r "
-                            + "WHERE r.name = :name")
-    ,
+                            + "WHERE r.name = :name"),
     @NamedQuery(
         name = "Role.count",
-        query = "SELECT COUNT(r) FROM Role r")
-    ,
+        query = "SELECT COUNT(r) FROM Role r"),
     @NamedQuery(
         name = "Role.findAllOrderedByRoleName",
-        query = "SELECT r FROM Role r ORDER BY r.name")
-    ,
+        query = "SELECT r FROM Role r ORDER BY r.name"),
     @NamedQuery(
         name = "Role.findAllOrderedByRoleNameLimit",
-        query = "SELECT r FROM Role r ORDER BY r.name ")
-    ,
+        query = "SELECT r FROM Role r ORDER BY r.name "),
     @NamedQuery(
         name = "Role.findAllOrderedByRoleNameDesc",
-        query = "SELECT r FROM Role r ORDER BY r.name DESC")
-    ,
+        query = "SELECT r FROM Role r ORDER BY r.name DESC"),
     @NamedQuery(
         name = "Role.searchByName",
         query = "SELECT r FROM Role r "
                     + "WHERE LOWER(r.name) LIKE CONCAT(LOWER(:name), '%') "
-                    + "ORDER BY r.name ")
-    ,
+                    + "ORDER BY r.name "),
     @NamedQuery(
         name = "Role.searchByNameCount",
         query = "SELECT COUNT(r.name) FROM Role r "
                     + "WHERE LOWER(r.name) LIKE CONCAT(LOWER(:name), '%') "
                     + "GROUP BY r.name "
-                    + "ORDER BY r.name ")
-    ,
+                    + "ORDER BY r.name "),
     @NamedQuery(
         name = "Role.findByPrivilege",
         query = "SELECT r FROM Role r JOIN r.permissions p "
                     + "WHERE p.grantedPrivilege = :privilege "
-                    + "ORDER BY r.name")
-    ,
+                    + "ORDER BY r.name"),
     @NamedQuery(
         name = "Role.findByPrivilegeAndObject",
         query = "SELECT r FROM Role r JOIN r.permissions p "
                     + "WHERE p.grantedPrivilege = :privilege "
                     + "AND p.object = :object "
-                    + "ORDER BY r.name")
-    ,
+                    + "ORDER BY r.name"),
     @NamedQuery(
         name = "Role.findRolesOfUser",
         query = "SELECT r.role FROM RoleMembership r "
-                    + "WHERE r.member = :user")
-    ,
+                    + "WHERE r.member = :user"),
     @NamedQuery(
         name = "Role.findByParty",
         query = "SELECT r FROM Role r "
@@ -135,8 +125,7 @@ import javax.xml.bind.annotation.XmlRootElement;
     @NamedEntityGraph(
         name = Role.ENTITY_GRPAH_WITH_MEMBERS,
         attributeNodes = {
-            @NamedAttributeNode(value = "memberships"),})
-    ,
+            @NamedAttributeNode(value = "memberships"),}),
     @NamedEntityGraph(
         name = Role.ENTITY_GRPAH_WITH_PERMISSIONS,
         attributeNodes = {
@@ -146,17 +135,21 @@ import javax.xml.bind.annotation.XmlRootElement;
 @XmlRootElement(name = "role", namespace = CORE_XML_NS)
 @XmlAccessorType(XmlAccessType.FIELD)
 @SuppressWarnings({"PMD.ShortClassName", "PMD.TooManyMethods"})
-@JsonIdentityInfo(generator = ObjectIdGenerators.PropertyGenerator.class,
-                  resolver = RoleIdResolver.class,
-                  property = "uuid")
+@JsonIdentityInfo(
+    generator = ObjectIdGenerators.PropertyGenerator.class,
+    resolver = RoleIdResolver.class,
+    property = "uuid",
+    scope = Role.class
+)
 public class Role implements Serializable, Exportable {
 
     private static final long serialVersionUID = -7121296514181469687L;
 
     public static final String ENTITY_GRPAH_WITH_MEMBERS
-                                   = "Role.withMembers";
+        = "Role.withMembers";
+
     public static final String ENTITY_GRPAH_WITH_PERMISSIONS
-                                   = "Role.withPermissions";
+        = "Role.withPermissions";
 
     @Id
     @Column(name = "ROLE_ID")

ccm-core/src/main/java/org/libreccm/security/RoleMembership.java

@@ -72,8 +72,12 @@ import javax.persistence.Table;
     )
 })
 @XmlRootElement(name = "role-membership", namespace = CORE_XML_NS)
-@JsonIdentityInfo(generator = ObjectIdGenerators.PropertyGenerator.class,
-                  property = "uuid")
+@JsonIdentityInfo(
+    generator = ObjectIdGenerators.PropertyGenerator.class,
+    property = "uuid",
+    resolver = RoleMembershipIdResolver.class,
+    scope = RoleMembership.class
+)
 public class RoleMembership implements Serializable, Exportable {
 
     private static final long serialVersionUID = -3049727720697964793L;

ccm-core/src/main/java/org/libreccm/security/RoleMembershipIdResolver.java

@@ -0,0 +1,51 @@
+package org.libreccm.security;
+
+import com.fasterxml.jackson.annotation.ObjectIdGenerator;
+import com.fasterxml.jackson.annotation.ObjectIdResolver;
+import org.libreccm.cdi.utils.CdiUtil;
+
+import java.io.Serializable;
+
+/**
+ *
+ * @author <a href="mailto:jens.pelzetter@googlemail.com">Jens Pelzetter</a>
+ */
+public class RoleMembershipIdResolver implements ObjectIdResolver, Serializable{
+    
+    private static final long serialVersionUID = 1L;
+    
+     @Override
+    public void bindItem(
+        final ObjectIdGenerator.IdKey id, final Object object
+    ) {
+        // According to the Jackson JavaDoc, this method can be used to keep
+        // track of objects directly in a resolver implementation. We don't need
+        // this here therefore this method is empty.
+    }
+    
+     @Override
+    public Object resolveId(final ObjectIdGenerator.IdKey id) {
+        return CdiUtil
+            .createCdiUtil()
+            .findBean(RoleMembershipRepository.class)
+            .findByUuid(id.key.toString())
+            .orElseThrow(
+                () -> new IllegalArgumentException(
+                    String.format(
+                        "No RoleMembership with UUID %s in the database.",
+                        id.key.toString()
+                    )
+                )
+            );
+    }
+    
+     @Override
+    public ObjectIdResolver newForDeserialization(final Object context) {
+        return new RoleMembershipIdResolver();
+    }
+
+    @Override
+    public boolean canUseFor(final ObjectIdResolver resolverType) {
+        return resolverType instanceof RoleMembershipIdResolver;
+    }
+}

ccm-core/src/main/java/org/libreccm/security/RoleMembershipRepository.java

@@ -0,0 +1,52 @@
+package org.libreccm.security;
+
+import org.libreccm.core.AbstractEntityRepository;
+
+import java.util.Optional;
+
+import javax.persistence.NoResultException;
+
+/**
+ *
+ * @author <a href="mailto:jens.pelzetter@googlemail.com">Jens Pelzetter</a>
+ */
+public class RoleMembershipRepository
+    extends AbstractEntityRepository<Long, RoleMembership> {
+
+    @Override
+    public Class<RoleMembership> getEntityClass() {
+        return RoleMembership.class;
+    }
+
+    @Override
+    public String getIdAttributeName() {
+        return "membershipId";
+    }
+
+    @Override
+    public Long getIdOfEntity(final RoleMembership entity) {
+        return entity.getMembershipId();
+    }
+
+    @Override
+    public boolean isNew(final RoleMembership entity) {
+        return entity.getMembershipId() == 0;
+    }
+
+    public Optional<RoleMembership> findByUuid(final String uuid) {
+        try {
+            return Optional.of(
+                getEntityManager()
+                    .createNamedQuery(
+                        "RoleMembership.findByUuid",
+                        RoleMembership.class
+                    )
+                    .setParameter("uuid", uuid)
+                    .getSingleResult()
+            );
+        } catch (NoResultException ex) {
+            return Optional.empty();
+        }
+    }
+
+}

ccm-core/src/main/java/org/libreccm/security/User.java

@@ -147,9 +147,12 @@ import javax.xml.bind.annotation.XmlTransient;
 //Supressing a few warnings from PMD because they misleading here.
 //User is perfectly fine class name, and the complexity is not to high...
 @SuppressWarnings({"PMD.ShortClassName", "PMD.LongVariable"})
-@JsonIdentityInfo(generator = ObjectIdGenerators.PropertyGenerator.class,
-                  resolver = UserIdResolver.class,
-                  property = "uuid")
+@JsonIdentityInfo(
+    generator = ObjectIdGenerators.PropertyGenerator.class,
+    resolver = UserIdResolver.class,
+    property = "uuid",
+    scope = User.class
+)
 public class User extends Party implements Serializable, Exportable {
 
     private static final long serialVersionUID = 4035223413596611393L;

ccm-core/src/main/java/org/libreccm/web/CcmApplication.java

@@ -78,9 +78,12 @@ import javax.persistence.Table;
         })
 })
 @XmlRootElement(name = "application", namespace = WEB_XML_NS)
-@JsonIdentityInfo(generator = ObjectIdGenerators.PropertyGenerator.class,
-                  resolver = ApplicationIdResolver.class,
-                  property = "uuid")
+@JsonIdentityInfo(
+    generator = ObjectIdGenerators.PropertyGenerator.class,
+    resolver = ApplicationIdResolver.class,
+    property = "uuid",
+    scope = CcmApplication.class
+)
 public class CcmApplication extends Resource implements Serializable,
                                                         Exportable {
 

ccm-core/src/main/java/org/libreccm/workflow/AssignableTask.java

@@ -59,27 +59,23 @@ import javax.persistence.TemporalType;
 @NamedQueries({
     @NamedQuery(
         name = "AssignableTask.findByUuid",
-        query = "SELECT t FROM AssignableTask t WHERE t.uuid = :uuid")
-    ,
+        query = "SELECT t FROM AssignableTask t WHERE t.uuid = :uuid"),
     @NamedQuery(
         name = "AssignableTask.findLockedBy",
-        query = "SELECT t FROM AssignableTask t WHERE t.lockingUser = :user")
-    ,
+        query = "SELECT t FROM AssignableTask t WHERE t.lockingUser = :user"),
     @NamedQuery(
         name = "AssignableTask.findEnabledTasksForWorkflow",
         query = "SELECT t FROM AssignableTask t "
                     + "WHERE t.lockingUser = :user "
                     + "AND t.workflow = :workflow"
-    )
-    ,
+    ),
     @NamedQuery(
         name = "AssignableTask.findAssignedTasks",
         query = "SELECT DISTINCT t FROM AssignableTask t "
                     + "JOIN t.assignments a "
                     + "WHERE a.role IN :roles "
                     + "AND t.workflow = :workflow "
-                    + "AND t.active = true")
-    ,
+                    + "AND t.active = true"),
     @NamedQuery(
         name = "AssignableTask.isAssignedTo",
         query = "SELECT (CASE WHEN COUNT(t) > 0 THEN true ELSE false END) "
@@ -87,8 +83,7 @@ import javax.persistence.TemporalType;
                     + "JOIN t.assignments a "
                     + "WHERE a.role IN :roles "
                     + "AND t = :task"
-    )
-    ,
+    ),
     @NamedQuery(
         name = "AssignableTask.findOverdueTasks",
         query = "SELECT t FROM AssignableTask t "
@@ -99,9 +94,12 @@ import javax.persistence.TemporalType;
 @SuppressWarnings({"PMD.CyclomaticComplexity",
                    "PMD.StdCyclomaticComplexity",
                    "PMD.ModifiedCyclomaticComplexity"})
-@JsonIdentityInfo(generator = ObjectIdGenerators.PropertyGenerator.class,
-                  resolver = AssignableTaskIdResolver.class,
-                  property = "uuid")
+@JsonIdentityInfo(
+    generator = ObjectIdGenerators.PropertyGenerator.class,
+    resolver = AssignableTaskIdResolver.class,
+    property = "uuid",
+    scope = AssignableTask.class
+)
 public class AssignableTask extends Task implements Serializable, Exportable {
 
     private static final long serialVersionUID = 4188064584389893019L;

ccm-core/src/main/java/org/libreccm/workflow/Task.java

@@ -77,44 +77,38 @@ import javax.xml.bind.annotation.XmlElementWrapper;
 @NamedQueries({
     @NamedQuery(
         name = "Task.findByUuid",
-        query = "SELECT t FROM Task t WHERE t.uuid = :uuid")
-    ,
+        query = "SELECT t FROM Task t WHERE t.uuid = :uuid"),
     @NamedQuery(
         name = "Task.countUnfinishedAndActiveTasksForWorkflow",
         query = "SELECT COUNT(t) FROM Task t "
                     + "WHERE t.taskState != org.libreccm.workflow.TaskState.FINISHED "
                 + "AND t.active = true "
-                    + "AND t.workflow = :workflow")
-    ,
+                    + "AND t.workflow = :workflow"),
     @NamedQuery(
         name = "Task.countUnfinishedTasksForWorkflow",
         query = "SELECT COUNT(t) FROM Task t "
                     + "WHERE t.taskState != org.libreccm.workflow.TaskState.FINISHED "
                 + "AND t.workflow = :workflow"
-    )
-    ,
+    ),
     @NamedQuery(
         name = "Task.findEnabledTasks",
         query = "SELECT t FROM Task t "
                     + "WHERE t.workflow = :workflow "
                     + "AND t.taskState = org.libreccm.workflow.TaskState.ENABLED "
                 + "AND t.active = true"
-    )
-    ,
+    ),
     @NamedQuery(
         name = "Task.findFinishedTasks",
         query = "SELECT t FROM Task t "
                     + "WHERE t.workflow = :workflow "
-                    + "AND t.taskState = org.libreccm.workflow.TaskState.FINISHED")
-    ,
+                    + "AND t.taskState = org.libreccm.workflow.TaskState.FINISHED"),
     @NamedQuery(
         name = "Task.existsDependency",
         query = "SELECT (CASE WHEN COUNT(d) > 0 THEN true ELSE false END) "
                     + "FROM TaskDependency d "
                     + "WHERE d.blockedTask = :blockedTask "
                     + "AND d.blockingTask = :blockingTask"
-    )
-    ,
+    ),
     @NamedQuery(
         name = "Task.findDependency",
         query = "SELECT d FROM TaskDependency d "
@@ -122,9 +116,12 @@ import javax.xml.bind.annotation.XmlElementWrapper;
                     + "AND d.blockingTask = :blockingTask"
     )
 })
-@JsonIdentityInfo(generator = ObjectIdGenerators.PropertyGenerator.class,
-                  resolver = TaskIdResolver.class,
-                  property = "uuid")
+@JsonIdentityInfo(
+    generator = ObjectIdGenerators.PropertyGenerator.class,
+    resolver = TaskIdResolver.class,
+    property = "uuid",
+    scope = Task.class
+)
 public class Task implements Identifiable, Serializable {
 
     private static final long serialVersionUID = 8161343036908150426L;
@@ -207,7 +204,6 @@ public class Task implements Identifiable, Serializable {
     @JsonIgnore
     private List<TaskDependency> blockingTasks;
 
-
     /**
      * Comments for the task.
      */

ccm-core/src/main/java/org/libreccm/workflow/TaskAssignment.java

@@ -68,7 +68,8 @@ import javax.persistence.Table;
 })
 @JsonIdentityInfo(
     generator = ObjectIdGenerators.PropertyGenerator.class,
-    property = "customAssignId"
+    resolver = TaskAssignmentIdResolver.class,
+    property = "uuid"
 )
 public class TaskAssignment implements Serializable, Exportable {
 

ccm-core/src/main/java/org/libreccm/workflow/TaskAssignmentIdResolver.java

@@ -0,0 +1,50 @@
+package org.libreccm.workflow;
+
+import com.fasterxml.jackson.annotation.ObjectIdGenerator;
+import com.fasterxml.jackson.annotation.ObjectIdResolver;
+import org.libreccm.cdi.utils.CdiUtil;
+
+import java.io.Serializable;
+
+/**
+ *
+ * @author <a href="mailto:jens.pelzetter@googlemail.com">Jens Pelzetter</a>
+ */
+public class TaskAssignmentIdResolver implements ObjectIdResolver, Serializable{
+    
+    private static final long serialVersionUID = 1L;
+
+    @Override
+    public void bindItem(final ObjectIdGenerator.IdKey id, final Object pojo) {
+      // According to the Jackson JavaDoc, this method can be used to keep
+        // track of objects directly in a resolver implementation. We don't need
+        // this here therefore this method is empty.
+    }
+
+    @Override
+    public Object resolveId(final ObjectIdGenerator.IdKey id) {
+return CdiUtil
+    .createCdiUtil()
+    .findBean(TaskAssignmentRepository.class)
+    .findByUuid(id.key.toString())
+    .orElseThrow(
+        () -> new IllegalArgumentException(
+            String.format(
+                "No TaskAssignment with UUID %s found in the database.",
+                id.key.toString()
+            )
+        )
+    );
+    }
+
+    @Override
+    public ObjectIdResolver newForDeserialization(final Object context) {
+        return new TaskAssignmentIdResolver();
+    }
+
+    @Override
+    public boolean canUseFor(final ObjectIdResolver resolverType) {
+        return resolverType instanceof TaskAssignmentIdResolver;
+    }
+    
+}

ccm-core/src/main/java/org/libreccm/workflow/TaskAssignmentRepository.java

@@ -0,0 +1,59 @@
+package org.libreccm.workflow;
+
+import org.libreccm.core.AbstractEntityRepository;
+
+import java.util.Optional;
+
+import javax.persistence.NoResultException;
+import javax.persistence.TypedQuery;
+
+/**
+ *
+ * @author <a href="mailto:jens.pelzetter@googlemail.com">Jens Pelzetter</a>
+ */
+public class TaskAssignmentRepository
+    extends AbstractEntityRepository<Long, TaskAssignment> {
+
+    private static final long serialVersionUID = 1L;
+
+    @Override
+    public Class<TaskAssignment> getEntityClass() {
+        return TaskAssignment.class;
+    }
+
+    @Override
+    public String getIdAttributeName() {
+        return "taskAssignmentId";
+    }
+
+    @Override
+    public Long getIdOfEntity(final TaskAssignment entity) {
+        return entity.getTaskAssignmentId();
+    }
+
+    @Override
+    public boolean isNew(final TaskAssignment entity) {
+        return entity.getTaskAssignmentId() == 0;
+    }
+
+    public Optional<TaskAssignment> findByUuid(final String uuid) {
+        final TypedQuery<TaskComment> query = getEntityManager()
+            .createNamedQuery("TaskComment.findByUuid", TaskComment.class);
+        query.setParameter("uuid", uuid);
+
+        try {
+            return Optional.of(
+                getEntityManager()
+                    .createNamedQuery(
+                        "TaskAssignment.findByUuid",
+                        TaskAssignment.class
+                    )
+                    .setParameter("uuid", uuid)
+                    .getSingleResult()
+            );
+        } catch (NoResultException ex) {
+            return Optional.empty();
+        }
+    }
+
+}

ccm-core/src/main/java/org/libreccm/workflow/TaskComment.java

@@ -54,13 +54,16 @@ import javax.persistence.Table;
 @Entity
 @Table(name = "WORKFLOW_TASK_COMMENTS", schema = CoreConstants.DB_SCHEMA)
 @NamedQueries({
-        @NamedQuery(
-                name = "TaskComment.findByUuid",
-                query = "SELECT c FROM TaskComment c WHERE c.uuid = :uuid")
+    @NamedQuery(
+        name = "TaskComment.findByUuid",
+        query = "SELECT c FROM TaskComment c WHERE c.uuid = :uuid")
 })
-@JsonIdentityInfo(generator = ObjectIdGenerators.PropertyGenerator.class,
-                  resolver = TaskCommentIdResolver.class,
-                  property = "uuid")
+@JsonIdentityInfo(
+    generator = ObjectIdGenerators.PropertyGenerator.class,
+    resolver = TaskCommentIdResolver.class,
+    property = "uuid",
+    scope = TaskComment.class
+)
 public class TaskComment implements Identifiable, Serializable, Exportable {
 
     private static final long serialVersionUID = 3842991529698351698L;
@@ -179,11 +182,11 @@ public class TaskComment implements Identifiable, Serializable, Exportable {
 
     public String toString(final String data) {
         return String.format("%s{ "
-                                     + "commentId = %d, "
-                                     + "uuid = \"%s\""
-                                     + "comment = \"%s\", "
-                                     + "author = %s%s"
-                                     + " }",
+                                 + "commentId = %d, "
+                                 + "uuid = \"%s\""
+                                 + "comment = \"%s\", "
+                                 + "author = %s%s"
+                                 + " }",
                              super.toString(),
                              commentId,
                              uuid,

ccm-core/src/main/java/org/libreccm/workflow/TaskDependency.java

@@ -48,7 +48,8 @@ import javax.persistence.Table;
 @NamedQueries({
     @NamedQuery(
         name = "TaskDependency.findById",
-        query = "SELECT d FROM TaskDependency d WHERE d.taskDependencyId = :dependencyId"
+        query
+        = "SELECT d FROM TaskDependency d WHERE d.taskDependencyId = :dependencyId"
     ),
     @NamedQuery(
         name = "TaskDependency.findByUuid",
@@ -65,7 +66,8 @@ import javax.persistence.Table;
 })
 @JsonIdentityInfo(
     generator = ObjectIdGenerators.PropertyGenerator.class,
-                  property = "uuid"
+    resolver = TaskDependencyIdResolver.class,
+    property = "uuid"
 )
 public class TaskDependency implements Serializable, Exportable {
 

ccm-core/src/main/java/org/libreccm/workflow/TaskDependencyIdResolver.java

@@ -0,0 +1,51 @@
+package org.libreccm.workflow;
+
+import com.fasterxml.jackson.annotation.ObjectIdGenerator;
+import com.fasterxml.jackson.annotation.ObjectIdResolver;
+import org.libreccm.cdi.utils.CdiUtil;
+
+import java.io.Serializable;
+
+/**
+ *
+ * @author <a href="mailto:jens.pelzetter@googlemail.com">Jens Pelzetter</a>
+ */
+public class TaskDependencyIdResolver
+    implements ObjectIdResolver, Serializable {
+
+    private static final long serialVersionUID = 1L;
+
+    @Override
+    public void bindItem(final ObjectIdGenerator.IdKey id, final Object pojo) {
+        // According to the Jackson JavaDoc, this method can be used to keep
+        // track of objects directly in a resolver implementation. We don't need
+        // this here therefore this method is empty.
+    }
+
+    @Override
+    public Object resolveId(final ObjectIdGenerator.IdKey id) {
+    return CdiUtil
+        .createCdiUtil()
+        .findBean(TaskDependencyRepository.class)
+        .findByUuid(id.key.toString())
+        .orElseThrow(
+            () -> new IllegalArgumentException(
+                String.format(
+                    "No TaskDependency with UUID %s found in the database.",
+                    id.key.toString()
+                )
+            )
+        );
+    }
+
+    @Override
+    public ObjectIdResolver newForDeserialization(final Object context) {
+ return new TaskDependencyIdResolver();
+    }
+
+    @Override
+    public boolean canUseFor(final ObjectIdResolver resolverType) {
+        return resolverType instanceof TaskDependencyIdResolver;
+    }
+
+}

ccm-core/src/main/java/org/libreccm/workflow/TaskDependencyRepository.java

@@ -0,0 +1,65 @@
+package org.libreccm.workflow;
+
+import org.libreccm.core.AbstractEntityRepository;
+
+import java.util.Optional;
+
+import javax.enterprise.context.RequestScoped;
+import javax.persistence.NoResultException;
+import javax.persistence.TypedQuery;
+
+/**
+ * Repository for {@link TaskDependency}.
+ *
+ * @author <a href="mailto:jens.pelzetter@googlemail.com">Jens Pelzetter</a>
+ */
+@RequestScoped
+public class TaskDependencyRepository
+    extends AbstractEntityRepository<Long, TaskDependency> {
+
+    private static final long serialVersionUID = 1L;
+
+    @Override
+    public Class<TaskDependency> getEntityClass() {
+        return TaskDependency.class;
+    }
+
+    @Override
+    public String getIdAttributeName() {
+        return "taskDependencyId";
+    }
+
+    @Override
+    public Long getIdOfEntity(final TaskDependency entity) {
+        return entity.getTaskDependencyId();
+    }
+
+    @Override
+    public boolean isNew(TaskDependency entity) {
+        return entity.getTaskDependencyId() == 0;
+    }
+
+    /**
+     * Finds a {@link TaskComment} by its uuid.
+     *
+     * @param uuid The uuid of the item to find
+     *
+     * @return An optional either with the found item or empty
+     */
+    public Optional<TaskDependency> findByUuid(final String uuid) {
+        try {
+            return Optional.of(
+                getEntityManager()
+                    .createNamedQuery(
+                        "TaskDependency.findByUuid",
+                        TaskDependency.class
+                    )
+                    .setParameter("uuid", uuid)
+                    .getSingleResult()
+            );
+        } catch (NoResultException ex) {
+            return Optional.empty();
+        }
+    }
+
+}

ccm-core/src/main/java/org/libreccm/workflow/Workflow.java

@@ -70,16 +70,18 @@ import org.libreccm.imexport.Exportable;
 @NamedQueries({
     @NamedQuery(
         name = "Workflow.findByUuid",
-        query = "SELECT w FROM Workflow w WHERE w.uuid = :uuid")
-    ,
+        query = "SELECT w FROM Workflow w WHERE w.uuid = :uuid"),
     @NamedQuery(
         name = "Workflow.findForObject",
         query = "SELECT w FROM Workflow w "
                     + "WHERE w.object = :object")
 })
-@JsonIdentityInfo(generator = ObjectIdGenerators.PropertyGenerator.class,
-                  resolver = WorkflowIdResolver.class,
-                  property = "uuid")
+@JsonIdentityInfo(
+    generator = ObjectIdGenerators.PropertyGenerator.class,
+    resolver = WorkflowIdResolver.class,
+    property = "uuid",
+    scope = Workflow.class
+)
 public class Workflow implements Identifiable, Serializable, Exportable {
 
     private static final long serialVersionUID = 4322500264543325829L;