Bug 412391: Add support for hidden mappedsuperclass attributes

Signed-off-by: Will Dazey <dazeydev.3@gmail.com>

jpa/eclipselink.jpa.test.jse/src/it/java/org/eclipse/persistence/jpa/test/weave/TestWeaving.java

@@ -0,0 +1,87 @@
+/*
+ * Copyright (c) 2021 Oracle, and/or affiliates. All rights reserved.
+ * Copyright (c) 2021 IBM Corporation. All rights reserved.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v. 2.0 which is available at
+ * http://www.eclipse.org/legal/epl-2.0,
+ * or the Eclipse Distribution License v. 1.0 which is available at
+ * http://www.eclipse.org/org/documents/edl-v10.php.
+ *
+ * SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause
+ */
+// Contributors:
+//     IBM - Bug 412391: Add support for weaving hidden variables
+package org.eclipse.persistence.jpa.test.weave;
+
+import jakarta.persistence.EntityManager;
+import jakarta.persistence.EntityManagerFactory;
+
+import org.eclipse.persistence.jpa.test.framework.DDLGen;
+import org.eclipse.persistence.jpa.test.framework.Emf;
+import org.eclipse.persistence.jpa.test.framework.EmfRunner;
+import org.eclipse.persistence.jpa.test.framework.Property;
+import org.eclipse.persistence.jpa.test.weave.model.WeavedAbstractMS;
+import org.eclipse.persistence.jpa.test.weave.model.WeavedEntityA;
+import org.junit.Assert;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+@RunWith(EmfRunner.class)
+public class TestWeaving {
+
+    @Emf(createTables = DDLGen.DROP_CREATE, 
+            classes = { WeavedAbstractMS.class, WeavedEntityA.class },
+            properties = { @Property(name = "eclipselink.cache.shared.default", value = "false") })
+    private EntityManagerFactory emf;
+
+    private static boolean POPULATED = false;
+
+    @Test
+    public void testHiddenAttribute() throws Exception {
+        if (emf == null)
+            return;
+
+        if(!POPULATED) 
+            populate();
+
+        EntityManager em = emf.createEntityManager();
+        try {
+            final WeavedEntityA e1 = em.find(WeavedEntityA.class, 123l);
+
+            Assert.assertNotNull(e1);
+            Assert.assertNotNull(e1.getHiddenAttribute());
+        } catch (Exception e) {
+            e.printStackTrace();
+            throw e;
+        } finally {
+            if (em != null) {
+                if (em.getTransaction().isActive()) {
+                    em.getTransaction().rollback();
+                }
+                em.close();
+            }
+        }
+    }
+
+    private void populate() {
+        EntityManager em = emf.createEntityManager();
+        try {
+            em.getTransaction().begin();
+
+            WeavedEntityA tbl1 = new WeavedEntityA();
+            tbl1.setId(123l);
+            tbl1.setHiddenAttribute((short) 1);
+            em.persist(tbl1);
+
+            em.getTransaction().commit();
+
+            POPULATED = true;
+        } finally {
+            if(em.isOpen()) {
+                em.clear();
+                em.close();
+            }
+        }
+    }
+}

jpa/eclipselink.jpa.test.jse/src/it/java/org/eclipse/persistence/jpa/test/weave/model/WeavedAbstractMS.java

@@ -0,0 +1,36 @@
+/*
+ * Copyright (c) 2021 Oracle, and/or affiliates. All rights reserved.
+ * Copyright (c) 2021 IBM Corporation. All rights reserved.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v. 2.0 which is available at
+ * http://www.eclipse.org/legal/epl-2.0,
+ * or the Eclipse Distribution License v. 1.0 which is available at
+ * http://www.eclipse.org/org/documents/edl-v10.php.
+ *
+ * SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause
+ */
+// Contributors:
+//     IBM - Bug 412391: Add support for weaving hidden variables
+package org.eclipse.persistence.jpa.test.weave.model;
+
+import jakarta.persistence.MappedSuperclass;
+
+@MappedSuperclass
+public abstract class WeavedAbstractMS {
+    private String parentOnlyAttribute;
+    private Short hiddenAttribute;
+
+    public String getParentOnlyAttribute() {
+        return parentOnlyAttribute;
+    }
+    public void setParentOnlyAttribute(String parentOnlyAttribute) {
+        this.parentOnlyAttribute = parentOnlyAttribute;
+    }
+    public Short getHiddenAttribute() {
+        return hiddenAttribute;
+    }
+    public void setHiddenAttribute(Short hiddenAttribute) {
+        this.hiddenAttribute = hiddenAttribute;
+    }
+}

jpa/eclipselink.jpa.test.jse/src/it/java/org/eclipse/persistence/jpa/test/weave/model/WeavedEntityA.java

@@ -0,0 +1,32 @@
+/*
+ * Copyright (c) 2021 Oracle, and/or affiliates. All rights reserved.
+ * Copyright (c) 2021 IBM Corporation. All rights reserved.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v. 2.0 which is available at
+ * http://www.eclipse.org/legal/epl-2.0,
+ * or the Eclipse Distribution License v. 1.0 which is available at
+ * http://www.eclipse.org/org/documents/edl-v10.php.
+ *
+ * SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause
+ */
+// Contributors:
+//     IBM - Bug 412391: Add support for weaving hidden variables
+package org.eclipse.persistence.jpa.test.weave.model;
+
+import jakarta.persistence.Entity;
+import jakarta.persistence.Id;
+
+@Entity
+public class WeavedEntityA extends WeavedAbstractMS {
+
+    @Id private long id;
+    private Short hiddenAttribute;
+
+    public long getId() {
+        return id;
+    }
+    public void setId(long id) {
+        this.id = id;
+    }
+}

jpa/org.eclipse.persistence.jpa/src/main/java/org/eclipse/persistence/internal/jpa/weaving/TransformerFactory.java

@@ -1,5 +1,6 @@
 /*
  * Copyright (c) 1998, 2021 Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2021 IBM Corporation. All rights reserved.
  *
  * This program and the accompanying materials are made available under the
  * terms of the Eclipse Public License v. 2.0 which is available at
@@ -125,6 +126,26 @@ public void addClassDetailsForMappedSuperClasses(MetadataClass clz, ClassDescrip
             }
         }
 
+        // If the superclass declares more mappings than there are unmapped mappings still to process, this superclass has shadowed attributes
+        if(mappedSuperclassDescriptor != null && unMappedAttributes.size() < mappedSuperclassDescriptor.getMappings().size()) {
+            List<DatabaseMapping> hiddenMappings = new ArrayList<DatabaseMapping>();
+            for(DatabaseMapping mapping : mappedSuperclassDescriptor.getMappings()) {
+                boolean contains = false;
+                String name = mapping.getAttributeName();
+                for(DatabaseMapping newmapping : unMappedAttributes) {
+                    if(name.equals(newmapping.getAttributeName())) {
+                        contains = true;
+                        break;
+                    }
+                }
+                // If the super has a mapping that wasn't processed by the subclasses, add it to be processed
+                if(!contains) {
+                    hiddenMappings.add(mapping);
+                }
+            }
+            unMappedAttributes.addAll(hiddenMappings);
+        }
+
         boolean weaveValueHolders = canWeaveValueHolders(superClz, unMappedAttributes);
 
         List<DatabaseMapping> stillUnMappedMappings = null;
@@ -266,11 +287,11 @@ protected boolean wasChangeTrackingAlreadyWeaved(Class<?> clz){
     /**
      * Determine if value holders are required to be weaved into the class.
      */
-    protected boolean canWeaveValueHolders(MetadataClass clz, List mappings) {
+    protected boolean canWeaveValueHolders(MetadataClass clz, List<DatabaseMapping> mappings) {
         // we intend to change to fetch=LAZY 1:1 attributes to ValueHolders
         boolean weaveValueHolders = false;
-        for (Iterator iterator = mappings.iterator(); iterator.hasNext();) {
-            DatabaseMapping mapping = (DatabaseMapping)iterator.next();
+        for (Iterator<DatabaseMapping> iterator = mappings.iterator(); iterator.hasNext();) {
+            DatabaseMapping mapping = iterator.next();
             String attributeName = mapping.getAttributeName();
             if (mapping.isForeignReferenceMapping()) {
                 ForeignReferenceMapping foreignReferenceMapping = (ForeignReferenceMapping)mapping;