#435 - Duplicate foreign key name with ManyToMany relations

src/test/java/com/avaje/tests/m2m/TestM2MSelfRelationship.java

@@ -0,0 +1,29 @@
+package com.avaje.tests.m2m;
+
+import com.avaje.ebean.BaseTestCase;
+import com.avaje.ebean.Ebean;
+import com.avaje.tests.model.m2m.MnyTopic;
+import org.junit.Test;
+
+/**
+ * Added to test DDL generation for ManyToMany related back to itself.
+ */
+public class TestM2MSelfRelationship extends BaseTestCase {
+
+  @Test
+  public void test() {
+
+    Ebean.getDefaultServer();
+
+    // Create 2 roles r0 and r1
+    MnyTopic r0 = new MnyTopic("r0");
+    MnyTopic r1 = new MnyTopic("r1");
+
+    // Save r1 and r2
+    Ebean.save(r0);
+    Ebean.save(r1);
+
+    r0.getSubTopics().add(r1);
+    Ebean.save(r0);
+  }
+}

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

@@ -0,0 +1,67 @@
+package com.avaje.tests.model.m2m;
+
+import javax.persistence.Entity;
+import javax.persistence.Id;
+import javax.persistence.JoinColumn;
+import javax.persistence.JoinTable;
+import javax.persistence.ManyToMany;
+import javax.persistence.Version;
+import java.util.List;
+
+@Entity
+public class MnyTopic {
+
+  @Id
+  Long id;
+
+  String name;
+
+  @Version
+  Long version;
+
+  @ManyToMany
+  @JoinTable(name = "subtopics",
+      joinColumns = @JoinColumn(name = "topic", referencedColumnName = "id"),
+      inverseJoinColumns = @JoinColumn(name = "subtopic", referencedColumnName = "id"))
+  List<MnyTopic> subTopics;
+
+  public MnyTopic() {
+
+  }
+
+  public MnyTopic(String name) {
+    this.name = name;
+  }
+
+  public Long getId() {
+    return id;
+  }
+
+  public void setId(Long id) {
+    this.id = id;
+  }
+
+  public String getName() {
+    return name;
+  }
+
+  public void setName(String name) {
+    this.name = name;
+  }
+
+  public Long getVersion() {
+    return version;
+  }
+
+  public void setVersion(Long version) {
+    this.version = version;
+  }
+
+  public List<MnyTopic> getSubTopics() {
+    return subTopics;
+  }
+
+  public void setSubTopics(List<MnyTopic> subTopics) {
+    this.subTopics = subTopics;
+  }
+}