#600 - Unique index or primary key violation - double insert attempted on ManyToMany intersection

src/test/java/com/avaje/tests/model/m2m/DCredit.java

@@ -0,0 +1,49 @@
+package com.avaje.tests.model.m2m;
+
+import com.avaje.ebean.Model;
+
+import javax.persistence.CascadeType;
+import javax.persistence.Entity;
+import javax.persistence.Id;
+import javax.persistence.ManyToMany;
+import java.util.List;
+
+@Entity
+public class DCredit  extends Model {
+
+	@Id
+	Long id;
+
+  String credit;
+
+  @ManyToMany(cascade = CascadeType.PERSIST)
+  List<DRol> droles;
+
+	public DCredit(String credit) {
+		this.credit = credit;
+	}
+
+  public Long getId() {
+    return id;
+  }
+
+  public void setId(Long id) {
+    this.id = id;
+  }
+
+  public String getCredit() {
+    return credit;
+  }
+
+  public void setCredit(String credit) {
+    this.credit = credit;
+  }
+
+  public List<DRol> getDroles() {
+    return droles;
+  }
+
+  public void setDroles(List<DRol> droles) {
+    this.droles = droles;
+  }
+}

src/test/java/com/avaje/tests/model/m2m/DRol.java

@@ -0,0 +1,56 @@
+package com.avaje.tests.model.m2m;
+
+import com.avaje.ebean.Model;
+
+import javax.persistence.CascadeType;
+import javax.persistence.Entity;
+import javax.persistence.Id;
+import javax.persistence.ManyToMany;
+import java.util.List;
+
+@Entity
+public class DRol extends Model {
+
+  @Id
+  Long id;
+
+  final String name;
+
+  @ManyToMany(mappedBy = "droles", cascade = CascadeType.PERSIST)
+  private List<DCredit> credits;
+
+  @ManyToMany(mappedBy = "croles", cascade = CascadeType.PERSIST)
+  private List<DRot> rots;
+
+  public DRol(String name) {
+    this.name = name;
+  }
+
+  public Long getId() {
+    return id;
+  }
+
+  public void setId(Long id) {
+    this.id = id;
+  }
+
+  public String getName() {
+    return name;
+  }
+
+  public List<DCredit> getCredits() {
+    return credits;
+  }
+
+  public void setCredits(List<DCredit> credits) {
+    this.credits = credits;
+  }
+
+  public List<DRot> getRots() {
+    return rots;
+  }
+
+  public void setRots(List<DRot> rots) {
+    this.rots = rots;
+  }
+}

src/test/java/com/avaje/tests/model/m2m/DRot.java

@@ -0,0 +1,46 @@
+package com.avaje.tests.model.m2m;
+
+import com.avaje.ebean.Model;
+
+import javax.persistence.CascadeType;
+import javax.persistence.Entity;
+import javax.persistence.Id;
+import javax.persistence.ManyToMany;
+import java.util.List;
+
+
+@Entity
+public class DRot  extends Model {
+
+	@Id
+	Long id;
+
+	final String name;
+	
+	@ManyToMany(cascade = CascadeType.ALL)
+  List<DRol> croles;
+
+  public DRot(String name) {
+    this.name = name;
+  }
+
+  public Long getId() {
+    return id;
+  }
+
+  public void setId(Long id) {
+    this.id = id;
+  }
+
+  public String getName() {
+    return name;
+  }
+
+  public List<DRol> getCroles() {
+    return croles;
+  }
+
+  public void setCroles(List<DRol> croles) {
+    this.croles = croles;
+  }
+}

src/test/java/com/avaje/tests/model/m2m/TestM2MDoubleInsert.java

@@ -0,0 +1,23 @@
+package com.avaje.tests.model.m2m;
+
+import com.avaje.ebean.Ebean;
+import org.junit.Test;
+
+public class TestM2MDoubleInsert {
+
+  @Test
+  public void doubleInsert() {
+
+    DRol role = new DRol("rol");
+    role.save();
+
+    DCredit credit = new DCredit("x1");
+    credit.getDroles().add(role);
+    role.getCredits().add(credit);
+    credit.save();
+
+    DRot rot = new DRot("rot");
+    rot.getCroles().add(role);
+    Ebean.save(rot);
+  }
+}