ObjectIdResolvers for Export and Import part I

sci-publications/src/main/java/org/scientificcms/publications/ArticleInCollectedVolume.java

@@ -5,6 +5,9 @@
  */
 package org.scientificcms.publications;
 
+import com.fasterxml.jackson.annotation.JsonIdentityInfo;
+import com.fasterxml.jackson.annotation.JsonIdentityReference;
+import com.fasterxml.jackson.annotation.ObjectIdGenerators;
 import org.hibernate.envers.Audited;
 
 import java.util.Objects;
@@ -24,12 +27,18 @@ import static org.scientificcms.publications.SciPublicationsConstants.*;
 @Entity
 @Table(name = "ARTICLES_IN_COLLECTED_VOLUME", schema = DB_SCHEMA)
 @Audited
+@JsonIdentityInfo(
+    generator = ObjectIdGenerators.PropertyGenerator.class,
+    resolver = ArticleInCollectedVolumeIdResolver.class,
+    property = "uuid"
+)
 public class ArticleInCollectedVolume extends Publication {
 
     private static final long serialVersionUID = 1L;
 
     @ManyToOne
     @JoinColumn(name = "COLLECTED_VOLUME_ID")
+    @JsonIdentityReference(alwaysAsId = true)
     private CollectedVolume collectedVolume;
 
     @Column(name = "START_PAGE")

sci-publications/src/main/java/org/scientificcms/publications/ArticleInCollectedVolumeIdResolver.java

@@ -0,0 +1,62 @@
+package org.scientificcms.publications;
+
+import com.fasterxml.jackson.annotation.ObjectIdGenerator;
+import com.fasterxml.jackson.annotation.ObjectIdResolver;
+import org.libreccm.cdi.utils.CdiUtil;
+
+import java.io.Serializable;
+
+import javax.enterprise.context.RequestScoped;
+
+/**
+ *
+ * @author <a href="mailto:jens.pelzetter@googlemail.com">Jens Pelzetter</a>
+ */
+@RequestScoped
+public class ArticleInCollectedVolumeIdResolver 
+    implements Serializable, ObjectIdResolver{
+    
+    private static final long serialVersionUID = 1L;
+    
+      @Override
+    public void bindItem(
+        final ObjectIdGenerator.IdKey idKey,
+        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(PublicationRepository.class)
+            .findByUuidAndType(
+                id.key.toString(), 
+                ArticleInCollectedVolume.class
+            )
+            .orElseThrow(
+                () -> new IllegalArgumentException(
+                    String.format(
+                        "No ArticleInCollectedVolume with UUID %s in the "
+                            + "database.",
+                        id.key.toString()
+                    )
+                )
+            );
+    }
+
+    @Override
+    public ObjectIdResolver newForDeserialization(final Object context) {
+        return new ArticleInCollectedVolumeIdResolver();
+    }
+
+    @Override
+    public boolean canUseFor(final ObjectIdResolver resolverType) {
+        return resolverType instanceof ArticleInCollectedVolumeIdResolver;
+    }
+    
+    
+}

sci-publications/src/main/java/org/scientificcms/publications/ArticleInJournal.java

@@ -5,6 +5,9 @@
  */
 package org.scientificcms.publications;
 
+import com.fasterxml.jackson.annotation.JsonIdentityInfo;
+import com.fasterxml.jackson.annotation.JsonIdentityReference;
+import com.fasterxml.jackson.annotation.ObjectIdGenerators;
 import org.hibernate.envers.Audited;
 
 import java.time.LocalDate;
@@ -25,12 +28,18 @@ import static org.scientificcms.publications.SciPublicationsConstants.*;
 @Entity
 @Table(name = "ARTICLES_IN_JOURNAL", schema = DB_SCHEMA)
 @Audited
+@JsonIdentityInfo(
+    generator = ObjectIdGenerators.PropertyGenerator.class,
+    resolver = ArticleInCollectedVolumeIdResolver.class,
+    property = "uuid"
+)
 public class ArticleInJournal extends Publication {
 
     private static final long serialVersionUID = 1L;
 
     @ManyToOne
     @JoinColumn(name = "JOURNAL_ID")
+    @JsonIdentityReference(alwaysAsId = true)
     private Journal journal;
 
     @Column(name = "VOLUME")

sci-publications/src/main/java/org/scientificcms/publications/ArticleInJournalIdResolver.java

@@ -0,0 +1,58 @@
+package org.scientificcms.publications;
+
+import com.fasterxml.jackson.annotation.ObjectIdGenerator;
+import com.fasterxml.jackson.annotation.ObjectIdResolver;
+import org.libreccm.cdi.utils.CdiUtil;
+
+import java.io.Serializable;
+
+import javax.enterprise.context.RequestScoped;
+
+/**
+ *
+ * @author <a href="mailto:jens.pelzetter@googlemail.com">Jens Pelzetter</a>
+ */
+@RequestScoped
+public class ArticleInJournalIdResolver 
+    implements Serializable, ObjectIdResolver {
+
+    private static final long serialVersionUID = 1L;
+
+  @Override
+    public void bindItem(
+        final ObjectIdGenerator.IdKey idKey,
+        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(PublicationRepository.class)
+            .findByUuidAndType(id.key.toString(), ArticleInJournal.class)
+            .orElseThrow(
+                () -> new IllegalArgumentException(
+                    String.format(
+                        "No ArticleInJournal with UUID %s found in the "
+                            + "database.",
+                        id.key.toString()
+                    )
+                )
+            );
+    }
+
+    @Override
+    public ObjectIdResolver newForDeserialization(final Object context) {
+        return new ArticleInJournalIdResolver();
+    }
+
+    @Override
+    public boolean canUseFor(final ObjectIdResolver resolverType) {
+        return resolverType instanceof ArticleInJournalIdResolver;
+    }
+    
+}

sci-publications/src/main/java/org/scientificcms/publications/Authorship.java

@@ -5,6 +5,9 @@
  */
 package org.scientificcms.publications;
 
+import com.fasterxml.jackson.annotation.JsonIdentityInfo;
+import com.fasterxml.jackson.annotation.JsonIdentityReference;
+import com.fasterxml.jackson.annotation.ObjectIdGenerators;
 import org.hibernate.envers.Audited;
 import org.librecms.assets.Person;
 
@@ -29,6 +32,10 @@ import static org.scientificcms.publications.SciPublicationsConstants.*;
 @Entity
 @Table(name = "AUTHORSHIPS", schema = DB_SCHEMA)
 @Audited
+@JsonIdentityInfo(
+    generator = ObjectIdGenerators.PropertyGenerator.class,
+    property = "uuid"
+)
 public class Authorship implements Serializable, Comparable<Authorship> {
 
     private static final long serialVersionUID = 1L;
@@ -43,10 +50,12 @@ public class Authorship implements Serializable, Comparable<Authorship> {
 
     @ManyToOne
     @JoinColumn(name = "PUBLICATION_ID")
+    @JsonIdentityReference(alwaysAsId = true)
     private Publication publication;
 
     @ManyToOne
     @JoinColumn(name = "AUTHOR_ID")
+    @JsonIdentityReference(alwaysAsId = true)
     private Person author;
 
     @Column(name = "EDITOR")

sci-publications/src/main/java/org/scientificcms/publications/CollectedVolume.java

@@ -5,6 +5,9 @@
  */
 package org.scientificcms.publications;
 
+import com.fasterxml.jackson.annotation.JsonIdentityInfo;
+import com.fasterxml.jackson.annotation.JsonIgnore;
+import com.fasterxml.jackson.annotation.ObjectIdGenerators;
 import org.hibernate.envers.Audited;
 
 import java.util.ArrayList;
@@ -25,12 +28,18 @@ import static org.scientificcms.publications.SciPublicationsConstants.*;
 @Entity
 @Table(name = "COLLECTED_VOLUMES", schema = DB_SCHEMA)
 @Audited
+@JsonIdentityInfo(
+    generator = ObjectIdGenerators.PropertyGenerator.class,
+    resolver = CollectedVolumeIdResolver.class,
+    property = "uuid"
+)
 public class CollectedVolume extends PublicationWithPublisher {
 
     private static final long serialVersionUID = 1L;
 
     @OneToMany(mappedBy = "collectedVolume")
     @OrderBy("chapter")
+    @JsonIgnore
     private List<ArticleInCollectedVolume> articles;
 
     public CollectedVolume() {

sci-publications/src/main/java/org/scientificcms/publications/CollectedVolumeIdResolver.java

@@ -0,0 +1,55 @@
+package org.scientificcms.publications;
+
+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 CollectedVolumeIdResolver 
+    implements Serializable, ObjectIdResolver{
+
+    private static final long serialVersionUID = 1L;
+
+    @Override
+    public void bindItem(
+        final ObjectIdGenerator.IdKey idKey,
+        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(PublicationRepository.class)
+            .findByUuidAndType(id.key.toString(), CollectedVolume.class)
+            .orElseThrow(
+                () -> new IllegalArgumentException(
+                    String.format(
+                        "No CollectedVolume with UUID found in the database.",
+                        id.key.toString()
+                    )
+                )
+            );
+    }
+
+    @Override
+    public ObjectIdResolver newForDeserialization(final Object context) {
+        return new CollectedVolumeIdResolver();
+    }
+
+    @Override
+    public boolean canUseFor(final ObjectIdResolver resolverType) {
+        return resolverType instanceof CollectedVolumeIdResolver;
+    }
+    
+    
+}

sci-publications/src/main/java/org/scientificcms/publications/Expertise.java

@@ -1,5 +1,8 @@
 package org.scientificcms.publications;
 
+import com.fasterxml.jackson.annotation.JsonIdentityInfo;
+import com.fasterxml.jackson.annotation.JsonIdentityReference;
+import com.fasterxml.jackson.annotation.ObjectIdGenerators;
 import org.hibernate.envers.Audited;
 import org.librecms.assets.Organization;
 
@@ -20,6 +23,11 @@ import static org.scientificcms.publications.SciPublicationsConstants.*;
 @Entity
 @Table(name = "EXPERTISES", schema = DB_SCHEMA)
 @Audited
+@JsonIdentityInfo(
+    generator = ObjectIdGenerators.PropertyGenerator.class,
+    resolver = ExpertiseIdResolver.class,
+    property = "uuid"
+)
 public class Expertise extends Publication {
 
     private static final long serialVersionUID = 1L;
@@ -32,10 +40,12 @@ public class Expertise extends Publication {
 
     @OneToOne
     @JoinColumn(name = "ORGANIZATION_ID")
+    @JsonIdentityReference(alwaysAsId = true)
     private Organization organization;
 
     @OneToOne
     @JoinColumn(name = "ORDERER_ID")
+    @JsonIdentityReference(alwaysAsId = true)
     private Organization orderer;
 
     public String getPlace() {

sci-publications/src/main/java/org/scientificcms/publications/ExpertiseIdResolver.java

@@ -0,0 +1,53 @@
+package org.scientificcms.publications;
+
+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 ExpertiseIdResolver implements Serializable, ObjectIdResolver {
+
+    private static final long serialVersionUID = 1L;
+
+    @Override
+    public void bindItem(
+        final ObjectIdGenerator.IdKey idKey,
+        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(PublicationRepository.class)
+            .findByUuidAndType(id.key.toString(), Expertise.class)
+            .orElseThrow(
+                () -> new IllegalArgumentException(
+                    String.format(
+                        "No Expertise with UUID %s found in the database.",
+                        id.key.toString()
+                    )
+                )
+            );
+    }
+
+    @Override
+    public ObjectIdResolver newForDeserialization(final Object context) {
+        return new ExpertiseIdResolver();
+    }
+
+    @Override
+    public boolean canUseFor(final ObjectIdResolver resolverType) {
+        return resolverType instanceof ExpertiseIdResolver;
+    }
+    
+}

sci-publications/src/main/java/org/scientificcms/publications/Journal.java

@@ -5,6 +5,9 @@
  */
 package org.scientificcms.publications;
 
+import com.fasterxml.jackson.annotation.JsonIdentityInfo;
+import com.fasterxml.jackson.annotation.JsonIgnore;
+import com.fasterxml.jackson.annotation.ObjectIdGenerators;
 import org.hibernate.envers.Audited;
 import org.libreccm.l10n.LocalizedString;
 
@@ -48,6 +51,11 @@ import static org.scientificcms.publications.SciPublicationsConstants.*;
                     + "WHERE LOWER(j.title) LIKE CONCAT('%', :title, '%')"
     )
 })
+@JsonIdentityInfo(
+    generator = ObjectIdGenerators.PropertyGenerator.class,
+    resolver = JournalIdResolver.class,
+    property = "uuid"
+)
 public class Journal implements Serializable {
 
     private static final long serialVersionUID = 1L;
@@ -102,6 +110,7 @@ public class Journal implements Serializable {
     private String symbol;
 
     @OneToMany(mappedBy = "journal")
+    @JsonIgnore
     private List<ArticleInJournal> articles;
 
     public Journal() {

sci-publications/src/main/java/org/scientificcms/publications/JournalIdResolver.java

@@ -0,0 +1,53 @@
+package org.scientificcms.publications;
+
+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 JournalIdResolver implements Serializable, ObjectIdResolver {
+
+    private static final long serialVersionUID = 1L;
+
+    @Override
+    public void bindItem(
+        final ObjectIdGenerator.IdKey idKey,
+        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(JournalRepository.class)
+            .findByUuid(id.key.toString())
+            .orElseThrow(
+                () -> new IllegalArgumentException(
+                    String.format(
+                        "No Journa with UUID %s found in the database.",
+                        id.key.toString()
+                    )
+                )
+            );
+    }
+
+    @Override
+    public ObjectIdResolver newForDeserialization(final Object context) {
+        return new JournalIdResolver();
+    }
+
+    @Override
+    public boolean canUseFor(final ObjectIdResolver resolverType) {
+        return resolverType instanceof JournalIdResolver;
+    }
+
+}

sci-publications/src/main/java/org/scientificcms/publications/Publication.java

@@ -5,6 +5,9 @@
  */
 package org.scientificcms.publications;
 
+import com.fasterxml.jackson.annotation.JsonIdentityInfo;
+import com.fasterxml.jackson.annotation.JsonIgnore;
+import com.fasterxml.jackson.annotation.ObjectIdGenerators;
 import org.hibernate.annotations.NamedQueries;
 import org.hibernate.annotations.NamedQuery;
 import org.hibernate.envers.Audited;
@@ -93,6 +96,11 @@ import static org.scientificcms.publications.SciPublicationsConstants.*;
                     + "AND TYPE(p) = :type"
     )
 })
+@JsonIdentityInfo(
+    generator = ObjectIdGenerators.PropertyGenerator.class,
+    resolver = PublicationIdResolver.class,
+    property = "uuid"
+)
 public class Publication implements Serializable {
 
     private static final long serialVersionUID = 1L;
@@ -115,6 +123,7 @@ public class Publication implements Serializable {
         orphanRemoval = true
     )
     @OrderBy("authorOrder")
+    @JsonIgnore
     private List<Authorship> authorships;
 
     @Embedded
@@ -179,6 +188,7 @@ public class Publication implements Serializable {
     private Locale languageOfPublication;
 
     @OneToMany(mappedBy = "publication")
+    @JsonIgnore
     private List<VolumeInSeries> series;
 
     public Publication() {

sci-publications/src/main/java/org/scientificcms/publications/PublicationIdResolver.java

@@ -0,0 +1,58 @@
+package org.scientificcms.publications;
+
+import com.fasterxml.jackson.annotation.ObjectIdGenerator;
+import com.fasterxml.jackson.annotation.ObjectIdResolver;
+import org.libreccm.cdi.utils.CdiUtil;
+
+import java.io.Serializable;
+
+import javax.enterprise.context.RequestScoped;
+
+/**
+ *
+ * @author <a href="mailto:jens.pelzetter@googlemail.com">Jens Pelzetter</a>
+ */
+@RequestScoped
+public class PublicationIdResolver implements Serializable, ObjectIdResolver {
+    
+    private static final long serialVersionUID = 1L;
+
+    @Override
+    public void bindItem(
+        final ObjectIdGenerator.IdKey idKey,
+        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(PublicationRepository.class)
+            .findByUuid(id.key.toString())
+            .orElseThrow(
+                () -> new IllegalArgumentException(
+                    String.format(
+                        "No Publiation with UUID %s found in database.",
+                        id.key.toString()
+                    )
+                )
+            );
+    }
+
+    @Override
+    public ObjectIdResolver newForDeserialization(final Object context) {
+        return new PublicationIdResolver();
+    }
+
+    @Override
+    public boolean canUseFor(final ObjectIdResolver resolverType) {
+        return resolverType instanceof PublicationIdResolver;
+    }
+    
+    
+    
+}

sci-publications/src/main/java/org/scientificcms/publications/PublicationWithPublisher.java

@@ -5,6 +5,11 @@
  */
 package org.scientificcms.publications;
 
+import com.fasterxml.jackson.annotation.JsonIdentityInfo;
+import com.fasterxml.jackson.annotation.JsonIdentityReference;
+import com.fasterxml.jackson.annotation.JsonIgnore;
+import com.fasterxml.jackson.annotation.ObjectIdGenerator;
+import com.fasterxml.jackson.annotation.ObjectIdGenerators;
 import org.hibernate.envers.Audited;
 import org.libreccm.l10n.LocalizedString;
 
@@ -53,11 +58,17 @@ import static org.scientificcms.publications.SciPublicationsConstants.*;
                     + "WHERE p.isbn13 = :isbn"
     )
 })
+@JsonIdentityInfo(
+    generator = ObjectIdGenerators.PropertyGenerator.class,
+    resolver = PublicationWithPublisherIdResolver.class,
+    property = "uuid"
+)
 public class PublicationWithPublisher extends Publication {
 
     private static final long serialVersionUID = 1L;
 
     @ManyToOne
+    @JsonIdentityReference(alwaysAsId = true)
     private Publisher publisher;
 
     @Column(name = "ISBN10", length = 13)

sci-publications/src/main/java/org/scientificcms/publications/PublicationWithPublisherIdResolver.java

@@ -0,0 +1,61 @@
+package org.scientificcms.publications;
+
+import com.fasterxml.jackson.annotation.ObjectIdGenerator;
+import com.fasterxml.jackson.annotation.ObjectIdResolver;
+import org.libreccm.cdi.utils.CdiUtil;
+
+import java.io.Serializable;
+
+import javax.enterprise.context.RequestScoped;
+
+/**
+ *
+ * @author <a href="mailto:jens.pelzetter@googlemail.com">Jens Pelzetter</a>
+ */
+@RequestScoped
+public class PublicationWithPublisherIdResolver
+    implements Serializable, ObjectIdResolver {
+
+    private static final long serialVersionUID = 1L;
+
+    @Override
+    public void bindItem(
+        final ObjectIdGenerator.IdKey idKey,
+        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(PublicationRepository.class)
+            .findByUuidAndType(
+                id.key.toString(),
+                PublicationWithPublisher.class
+            )
+            .orElseThrow(
+                () -> new IllegalArgumentException(
+                    String.format(
+                        "No PublicationWithPublisher with UUID %s found in "
+                            + "database.",
+                        id.key.toString()
+                    )
+                )
+            );
+    }
+
+    @Override
+    public ObjectIdResolver newForDeserialization(final Object context) {
+        return new PublicationWithPublisherIdResolver();
+    }
+
+    @Override
+    public boolean canUseFor(final ObjectIdResolver resolverType) {
+        return resolverType instanceof PublicationWithPublisherIdResolver;
+    }
+
+}

sci-publications/src/main/java/org/scientificcms/publications/Publisher.java

@@ -5,6 +5,9 @@
  */
 package org.scientificcms.publications;
 
+import com.fasterxml.jackson.annotation.JsonIdentityInfo;
+import com.fasterxml.jackson.annotation.JsonIgnore;
+import com.fasterxml.jackson.annotation.ObjectIdGenerators;
 import org.hibernate.envers.Audited;
 
 import java.io.Serializable;
@@ -43,6 +46,11 @@ import static org.scientificcms.publications.SciPublicationsConstants.*;
                     + "WHERE p.name LIKE CONCAT('%', :name, '%')"
     )
 })
+@JsonIdentityInfo(
+    generator = ObjectIdGenerators.PropertyGenerator.class,
+    resolver = PublisherIdResolver.class,
+    property = "uuid"
+)
 public class Publisher implements Serializable {
 
     private static final long serialVersionUID = 1L;
@@ -70,6 +78,7 @@ public class Publisher implements Serializable {
     private String place;
 
     @OneToMany(mappedBy = "publisher")
+    @JsonIgnore
     private List<PublicationWithPublisher> publications;
 
     public Publisher() {

sci-publications/src/main/java/org/scientificcms/publications/PublisherIdResolver.java

@@ -0,0 +1,56 @@
+package org.scientificcms.publications;
+
+
+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 PublisherIdResolver implements Serializable, ObjectIdResolver {
+    
+    private static final long serialVersionUID = 1L;
+    
+     @Override
+    public void bindItem(
+        final ObjectIdGenerator.IdKey idKey,
+        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(PublisherRepository.class)
+            .findByUuid(id.key.toString())
+            .orElseThrow(
+                () -> new IllegalArgumentException(
+                    String.format(
+                        "No Pubisher with UUID %s found in the database.",
+                        id.key.toString()
+                    )
+                )
+            );
+    }
+
+    @Override
+    public ObjectIdResolver newForDeserialization(final Object context) {
+        return new PublicationIdResolver();
+    }
+
+    @Override
+    public boolean canUseFor(final ObjectIdResolver resolverType) {
+        return resolverType instanceof PublicationIdResolver;
+    }
+    
+    
+    
+}

sci-publications/src/main/java/org/scientificcms/publications/Series.java

@@ -1,5 +1,8 @@
 package org.scientificcms.publications;
 
+import com.fasterxml.jackson.annotation.JsonIdentityInfo;
+import com.fasterxml.jackson.annotation.JsonIgnore;
+import com.fasterxml.jackson.annotation.ObjectIdGenerators;
 import org.hibernate.envers.Audited;
 import org.libreccm.l10n.LocalizedString;
 
@@ -42,6 +45,11 @@ import static org.scientificcms.publications.SciPublicationsConstants.*;
         query = "SELECT DISTINCT s FROM Series s JOIN s.title.values t WHERE lower(t) LIKE CONCAT ('%', :title, '%')"
     )
 })
+@JsonIdentityInfo(
+    generator = ObjectIdGenerators.PropertyGenerator.class,
+    resolver = SeriesIdResolver.class,
+    property = "uuid"
+)
 public class Series implements Serializable {
 
     private static final long serialVersionUID = 1L;
@@ -81,6 +89,7 @@ public class Series implements Serializable {
     private LocalizedString description;
 
     @OneToMany(mappedBy = "series")
+    @JsonIgnore
     private List<VolumeInSeries> volumes;
 
     public Series() {

sci-publications/src/main/java/org/scientificcms/publications/SeriesIdResolver.java

@@ -0,0 +1,53 @@
+package org.scientificcms.publications;
+
+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 SeriesIdResolver implements Serializable, ObjectIdResolver {
+
+    private static final long serialVersionUID = 1L;
+
+    @Override
+    public void bindItem(
+        final ObjectIdGenerator.IdKey idKey,
+        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(SeriesRepository.class)
+            .findByUuid(id.key.toString())
+            .orElseThrow(
+                () -> new IllegalArgumentException(
+                    String.format(
+                        "No Series with UUID %s found in the database.",
+                        id.key.toString()
+                    )
+                )
+            );
+    }
+
+    @Override
+    public ObjectIdResolver newForDeserialization(final Object context) {
+        return new SeriesIdResolver();
+    }
+
+    @Override
+    public boolean canUseFor(final ObjectIdResolver resolverType) {
+        return resolverType instanceof SeriesIdResolver;
+    }
+
+}

sci-publications/src/main/java/org/scientificcms/publications/VolumeInSeries.java

@@ -5,6 +5,9 @@
  */
 package org.scientificcms.publications;
 
+import com.fasterxml.jackson.annotation.JsonIdentityInfo;
+import com.fasterxml.jackson.annotation.JsonIdentityReference;
+import com.fasterxml.jackson.annotation.ObjectIdGenerators;
 import org.hibernate.envers.Audited;
 
 import java.io.Serializable;
@@ -28,6 +31,10 @@ import static org.scientificcms.publications.SciPublicationsConstants.*;
 @Entity
 @Table(name = "VOLUMES_IN_SERIES", schema = DB_SCHEMA)
 @Audited
+@JsonIdentityInfo(
+    generator = ObjectIdGenerators.PropertyGenerator.class,
+    property = "uuid"
+)
 public class VolumeInSeries implements Serializable {
 
     private static final long serialVersionUID = 1L;
@@ -45,10 +52,12 @@ public class VolumeInSeries implements Serializable {
 
     @ManyToOne
     @JoinColumn(name = "PUBLICATION_ID")
+    @JsonIdentityReference(alwaysAsId = true)
     private Publication publication;
 
     @ManyToOne
     @JoinColumn(name = "SERIES_ID")
+    @JsonIdentityReference(alwaysAsId = true)
     private Series series;
 
     public long getVolumeId() {

sci-types-project/src/main/java/org/scientificcms/contenttypes/sciproject/Contact.java

@@ -5,6 +5,9 @@
  */
 package org.scientificcms.contenttypes.sciproject;
 
+import com.fasterxml.jackson.annotation.JsonIdentityInfo;
+import com.fasterxml.jackson.annotation.JsonIdentityReference;
+import com.fasterxml.jackson.annotation.ObjectIdGenerators;
 import org.hibernate.envers.Audited;
 import org.libreccm.core.CcmObjects;
 import org.librecms.assets.ContactableEntity;
@@ -30,6 +33,10 @@ import static org.scientificcms.contenttypes.sciproject.SciProjectConstants.*;
 @Entity
 @Audited
 @Table(name = "PROJECT_CONTACTS", schema = DB_SCHEMA)
+@JsonIdentityInfo(
+    generator = ObjectIdGenerators.PropertyGenerator.class,
+    property = "uuid"
+)
 public class Contact implements Serializable {
 
     private static final long serialVersionUID = 1L;
@@ -47,10 +54,12 @@ public class Contact implements Serializable {
 
     @ManyToOne
     @JoinColumn(name = "PROJECT_ID")
+    @JsonIdentityReference(alwaysAsId = true)
     private SciProject project;
 
     @ManyToOne
     @JoinColumn(name = "CONTACTABLE_ID")
+    @JsonIdentityReference(alwaysAsId = true)
     private ContactableEntity contactable;
 
     public long getContactId() {

sci-types-project/src/main/java/org/scientificcms/contenttypes/sciproject/Membership.java

@@ -5,6 +5,9 @@
  */
 package org.scientificcms.contenttypes.sciproject;
 
+import com.fasterxml.jackson.annotation.JsonIdentityInfo;
+import com.fasterxml.jackson.annotation.JsonIdentityReference;
+import com.fasterxml.jackson.annotation.ObjectIdGenerators;
 import org.hibernate.envers.Audited;
 import org.libreccm.core.CcmObjects;
 import org.librecms.assets.Person;
@@ -32,6 +35,10 @@ import static org.scientificcms.contenttypes.sciproject.SciProjectConstants.*;
 @Entity
 @Audited
 @Table(name = "PROJECT_MEMBERSHIPS", schema = DB_SCHEMA)
+@JsonIdentityInfo(
+    generator = ObjectIdGenerators.PropertyGenerator.class,
+    property = "uuid"
+)
 public class Membership implements Serializable {
 
     private static final long serialVersionUID = 1L;
@@ -50,10 +57,12 @@ public class Membership implements Serializable {
 
     @ManyToOne
     @JoinColumn(name = "PROJECT_ID")
+    @JsonIdentityReference(alwaysAsId = true)
     private SciProject project;
 
     @ManyToOne
     @JoinColumn(name = "MEMBER_ID")
+    @JsonIdentityReference(alwaysAsId = true)
     private Person member;
 
     public long getMembershipId() {

sci-types-project/src/main/java/org/scientificcms/contenttypes/sciproject/SciProject.java

@@ -5,6 +5,11 @@
  */
 package org.scientificcms.contenttypes.sciproject;
 
+import com.fasterxml.jackson.annotation.JsonIdentityInfo;
+import com.fasterxml.jackson.annotation.JsonIgnore;
+import com.fasterxml.jackson.annotation.ObjectIdGenerator;
+import com.fasterxml.jackson.annotation.ObjectIdGenerators;
+
 import javax.persistence.Entity;
 
 import org.hibernate.envers.Audited;
@@ -88,6 +93,11 @@ import static org.scientificcms.contenttypes.sciproject.SciProjectConstants.*;
                     + "WHERE m.member = :member"
     )
 })
+@JsonIdentityInfo(
+    generator = ObjectIdGenerators.PropertyGenerator.class,
+    resolver = SciProjectIdResolver.class,
+    property = "uuid"
+)
 public class SciProject extends ContentItem implements Serializable {
 
     private static final long serialVersionUID = 1L;
@@ -142,17 +152,20 @@ public class SciProject extends ContentItem implements Serializable {
     )
     private LocalizedString fundingVolume;
 
+    
     @OneToMany(cascade = CascadeType.ALL, mappedBy = "project")
     @OrderBy("order ASC")
+    @JsonIgnore
     private List<Contact> contacts;
 
     @OneToMany(mappedBy = "project", cascade = CascadeType.ALL)
-//    @OrderBy("member.personName ASC")
     @OrderBy("member ASC")
+    @JsonIgnore
     private List<Membership> members;
 
     @OneToMany(mappedBy = "project", cascade = CascadeType.ALL)
     @OrderBy("order ASC")
+    @JsonIgnore
     private List<Sponsoring> sponsoring;
 
     public SciProject() {

sci-types-project/src/main/java/org/scientificcms/contenttypes/sciproject/SciProjectIdResolver.java

@@ -0,0 +1,57 @@
+package org.scientificcms.contenttypes.sciproject;
+
+import com.fasterxml.jackson.annotation.ObjectIdGenerator;
+import com.fasterxml.jackson.annotation.ObjectIdResolver;
+import org.libreccm.cdi.utils.CdiUtil;
+import org.librecms.contentsection.ContentItemRepository;
+
+import java.io.Serializable;
+
+import javax.enterprise.context.RequestScoped;
+
+/**
+ *
+ * @author <a href="mailto:jens.pelzetter@googlemail.com">Jens Pelzetter</a>
+ */
+@RequestScoped
+public class SciProjectIdResolver implements Serializable, ObjectIdResolver {
+
+    private static final long serialVersionUID = 1L;
+
+    @Override
+    public void bindItem(
+        final ObjectIdGenerator.IdKey idKey,
+        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(ContentItemRepository.class)
+            .findByUuid(id.key.toString(), SciProject.class)
+            .orElseThrow(
+                () -> new IllegalArgumentException(
+                    String.format(
+                        "No SciProject with UUID %s found in the datbase.",
+                        id.key.toString()
+                    )
+                )
+            );
+    }
+
+    @Override
+    public ObjectIdResolver newForDeserialization(final Object context) {
+        return new SciProjectIdResolver();
+    }
+
+    @Override
+    public boolean canUseFor(final ObjectIdResolver resolverType) {
+        return resolverType instanceof SciProjectIdResolver;
+    }
+
+}

sci-types-project/src/main/java/org/scientificcms/contenttypes/sciproject/Sponsoring.java

@@ -5,6 +5,9 @@
  */
 package org.scientificcms.contenttypes.sciproject;
 
+import com.fasterxml.jackson.annotation.JsonIdentityInfo;
+import com.fasterxml.jackson.annotation.JsonIdentityReference;
+import com.fasterxml.jackson.annotation.ObjectIdGenerators;
 import org.hibernate.envers.Audited;
 import org.libreccm.core.CcmObjects;
 import org.librecms.assets.Organization;
@@ -30,6 +33,10 @@ import static org.scientificcms.contenttypes.sciproject.SciProjectConstants.*;
 @Entity
 @Audited
 @Table(name = "SPONSORING", schema = DB_SCHEMA)
+@JsonIdentityInfo(
+    generator = ObjectIdGenerators.PropertyGenerator.class,
+    property = "uuid"
+)
 public class Sponsoring implements Serializable {
 
     private static final long serialVersionUID = 1L;
@@ -47,10 +54,12 @@ public class Sponsoring implements Serializable {
 
     @ManyToOne
     @JoinColumn(name = "PROJECT_ID")
+    @JsonIdentityReference(alwaysAsId = true)
     private SciProject project;
 
     @ManyToOne
     @JoinColumn(name = "SPONSOR_ID")
+    @JsonIdentityReference(alwaysAsId = true)
     private Organization sponsor;
 
     public long getSponsoringId() {