#2157 - ManyToMany mapping to itself results in broken generated SQL DDL when not defining @JoinTable.

ebean-core/src/test/java/org/tests/model/interfaces/SelfManyMany.java

@@ -0,0 +1,40 @@
+package org.tests.model.interfaces;
+
+import javax.persistence.Entity;
+import javax.persistence.Id;
+import javax.persistence.JoinColumn;
+import javax.persistence.JoinTable;
+import javax.persistence.ManyToMany;
+import java.util.List;
+
+@Entity
+public class SelfManyMany {
+
+  @Id
+  private long id;
+
+  private final String name;
+
+  @ManyToMany
+  // requires explicit @JoinTable
+  @JoinTable(name = "self_many_bridge",
+    joinColumns = @JoinColumn(name = "self_1_id"),
+    inverseJoinColumns = @JoinColumn(name = "self_2_id"))
+  private List<SelfManyMany> related;
+
+  public SelfManyMany(String name) {
+    this.name = name;
+  }
+
+  public long getId() {
+    return id;
+  }
+
+  public String getName() {
+    return name;
+  }
+
+  public List<SelfManyMany> getRelated() {
+    return related;
+  }
+}

ebean-core/src/test/java/org/tests/model/interfaces/TestSelfMany.java

@@ -0,0 +1,15 @@
+package org.tests.model.interfaces;
+
+import io.ebean.BaseTestCase;
+import io.ebean.DB;
+import org.junit.Test;
+
+public class TestSelfMany extends BaseTestCase {
+
+  @Test
+  public void self_manyToMany() {
+
+    SelfManyMany m = new SelfManyMany("1");
+    DB.save(m);
+  }
+}