Fix EmbeddedId not found cache (#1811)

src/test/java/org/tests/cache/TestCacheEmbeddedId.java

@@ -0,0 +1,32 @@
+package org.tests.cache;
+
+import io.ebean.BaseTestCase;
+import io.ebean.DB;
+import org.junit.Test;
+import org.tests.model.basic.CKeyParent;
+import org.tests.model.basic.CKeyParentId;
+
+import static org.junit.Assert.assertNotNull;
+
+public class TestCacheEmbeddedId extends BaseTestCase {
+
+  @Test
+  public void test() {
+
+    CKeyParentId id = new CKeyParentId(100, "testEmbedded");
+
+    CKeyParent p = new CKeyParent();
+    p.setId(id);
+    p.setName("testCache");
+
+    DB.save(p);
+
+    CKeyParent cKeyParent = DB.find(CKeyParent.class, id);
+    assertNotNull(cKeyParent);
+
+    // find for second time
+    // causes java.lang.ClassCastException: class java.lang.String cannot be cast to class org.tests.model.basic.CKeyParentId
+    cKeyParent = DB.find(CKeyParent.class, id);
+    assertNotNull(cKeyParent);
+  }
+}