#1617 - save() on a reference bean causes insert to occur ... results in duplicate key exception

Tests that reproduce the issue (supplied by Andre - thanks for that)

src/test/java/org/tests/o2o/TestReferenceSave.java

@@ -0,0 +1,28 @@
+package org.tests.o2o;
+
+
+import io.ebean.Ebean;
+import org.ebeantest.LoggedSqlCollector;
+import org.junit.Test;
+import org.tests.update.EPersonOnline;
+
+import java.util.List;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+public class TestReferenceSave {
+
+  @Test
+  public void test() {
+
+    Ebean.getDefaultServer();
+
+    LoggedSqlCollector.start();
+
+    EPersonOnline bean = Ebean.getReference(EPersonOnline.class, 1L);
+    Ebean.save(bean);
+
+    List<String> sql = LoggedSqlCollector.current();
+    assertThat(sql).hasSize(0);
+  }
+}