OPENJPA-2917 fix off-by-1 issue on java stack

long parameters take up 2 byte on the call stack

openjpa-kernel/src/main/java/org/apache/openjpa/enhance/PCDataGenerator.java

@@ -64,8 +64,7 @@ import org.apache.xbean.asm9.tree.VarInsnNode;
  */
 public class PCDataGenerator extends DynamicStorageGenerator {
 
-    private static final Localizer _loc = Localizer.forPackage
+    private static final Localizer _loc = Localizer.forPackage(PCDataGenerator.class);
-        (PCDataGenerator.class);
 
     protected static final String POSTFIX = "$openjpapcdata";
 
@@ -89,8 +88,10 @@ public class PCDataGenerator extends DynamicStorageGenerator {
      * Return a {@link PCData} instance for the given oid and metadata.
      */
     public PCData generatePCData(Object oid, ClassMetaData meta) {
-        if (meta == null)
+        if (meta == null) {
             return null;
+        }
+
         Class<?> type = meta.getDescribedType();
         DynamicStorage storage = _generated.get(type);
         if (storage == null) {
@@ -110,13 +111,15 @@ public class PCDataGenerator extends DynamicStorageGenerator {
      * Actually generate the factory instance.
      */
     private DynamicStorage generateStorage(ClassMetaData meta) {
-        if (_log.isTraceEnabled())
+        if (_log.isTraceEnabled()) {
             _log.trace(_loc.get("pcdata-generate", meta));
+        }
 
         FieldMetaData[] fields = meta.getFields();
         int[] types = new int[fields.length];
-        for (int i = 0; i < types.length; i++)
+        for (int i = 0; i < types.length; i++) {
             types[i] = replaceType(fields[i]);
+        }
         return generateStorage(types, meta);
     }
 
@@ -128,8 +131,10 @@ public class PCDataGenerator extends DynamicStorageGenerator {
 
     @Override
     protected int getCreateFieldMethods(int typeCode) {
-        if (typeCode >= JavaTypes.OBJECT)
+        if (typeCode >= JavaTypes.OBJECT) {
             return POLICY_SILENT;
+        }
+
         // don't bother creating set/get<Primitive> methods
         return POLICY_EMPTY;
     }

openjpa-kernel/src/main/java/org/apache/openjpa/enhance/PCEnhancer.java

@@ -1215,6 +1215,7 @@ public class PCEnhancer {
             addGetManagedValueCode(classNode, insns, fmd, true);
         }
         else {
+            // the method parameter
             insns.add(new VarInsnNode(AsmHelper.getLoadInsn(type), param + 1));
         }
         insns.add(new MethodInsnNode(Opcodes.INVOKESTATIC,
@@ -4195,7 +4196,7 @@ public class PCEnhancer {
                                               null, null);
         classNode.methods.add(newMethod);
         final InsnList instructions = newMethod.instructions;
-        int nextFreeVarPos = 2;
+        int nextFreeVarPos = 1 + Type.getType(propType).getSize();
 
         setVisibilityToSuperMethod(newMethod);
 

openjpa-persistence-jdbc/src/test/java/org/apache/openjpa/enhance/TestEnhancementWithMultiplePUs.java

@@ -26,12 +26,14 @@ import java.util.List;
 import org.apache.openjpa.conf.OpenJPAConfiguration;
 import org.apache.openjpa.conf.OpenJPAConfigurationImpl;
 import org.apache.openjpa.lib.conf.Configurations;
+import org.apache.openjpa.util.asm.AsmHelper;
 import org.apache.openjpa.util.asm.BytecodeWriter;
 import org.apache.openjpa.lib.util.J2DoPrivHelper;
 import org.apache.openjpa.lib.util.Options;
 import org.apache.openjpa.meta.MetaDataRepository;
 import org.apache.openjpa.persistence.test.AbstractCachedEMFTestCase;
 import org.apache.openjpa.util.asm.ClassNodeTracker;
+import org.apache.openjpa.util.asm.EnhancementClassLoader;
 import org.apache.openjpa.util.asm.EnhancementProject;
 import org.apache.xbean.asm9.Type;
 
@@ -52,10 +54,23 @@ public class TestEnhancementWithMultiplePUs
         ClassNodeTracker bc = assertNotPC(loader, project, className);
 
         PCEnhancer enhancer = new PCEnhancer(conf, bc, repos, loader);
+        enhancer.setCreateSubclass(true);
 
         assertEquals(PCEnhancer.ENHANCE_PC, enhancer.run());
 
         assertTrue(enhancer.getPCBytecode().getClassNode().interfaces.contains(Type.getInternalName(PersistenceCapable.class)));
+
+        // load the Class<?> for real.
+        EnhancementProject finalProject = new EnhancementProject();
+        EnhancementClassLoader finalLoader = new EnhancementClassLoader(finalProject, this.getClass().getClassLoader());
+        final byte[] classBytes2 = AsmHelper.toByteArray(enhancer.getPCBytecode());
+
+        // this is just to make the ClassLoader aware of the bytecode for the enhanced class
+        finalProject.loadClass(classBytes2, finalLoader);
+
+        String pcClassName = enhancer.getPCBytecode().getClassNode().name.replace("/", ".");
+        final Class<?> implClass = Class.forName(pcClassName, true, finalLoader);
+        assertNotNull(implClass);
     }
 
     private ClassNodeTracker assertNotPC(ClassLoader loader, EnhancementProject project, String className) {

openjpa-persistence-jdbc/src/test/java/org/apache/openjpa/enhance/UnenhancedBootstrapInstance.java

@@ -20,9 +20,48 @@ package org.apache.openjpa.enhance;
 
 import jakarta.persistence.Entity;
 import jakarta.persistence.Id;
+import jakarta.persistence.IdClass;
 
 @Entity
+@IdClass(UnenhancedBootstrapInstanceId.class)
 public class UnenhancedBootstrapInstance {
+    private long billNumber;
+    private long billVersion;
+    private long billRevision;
+    private String billDescription;
+
     @Id
-    private int id;
+    public long getBillNumber() {
+        return billNumber;
+    }
+
+    public void setBillNumber(final long number) {
+        billNumber = number;
+    }
+
+    @Id
+    public long getBillVersion() {
+        return billVersion;
+    }
+
+    public void setBillVersion(final long version) {
+        billVersion = version;
+    }
+
+    @Id
+    public long getBillRevision() {
+        return billRevision;
+    }
+
+    public void setBillRevision(final long revision) {
+        billRevision = revision;
+    }
+
+    public String getBillDescription() {
+        return billDescription;
+    }
+
+    public void setBillDescription(final String description) {
+        billDescription = description;
+    }
 }

openjpa-persistence-jdbc/src/test/java/org/apache/openjpa/enhance/UnenhancedBootstrapInstanceId.java

@@ -0,0 +1,87 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.openjpa.enhance;
+
+import java.io.Serializable;
+
+/**
+ *
+ */
+public class UnenhancedBootstrapInstanceId implements Serializable {
+    private long billNumber;
+    private long billVersion;
+    private long billRevision;
+
+    public UnenhancedBootstrapInstanceId() {
+
+    }
+
+    public UnenhancedBootstrapInstanceId(final long number, final long version, final long revision) {
+        this.billNumber = number;
+        this.billVersion = version;
+        this.billRevision = revision;
+    }
+
+    public long getBillNumber() {
+        return this.billNumber;
+    }
+
+    public void setBillNumber(final long number) {
+        this.billNumber = number;
+    }
+
+    public long getBillVersion() {
+        return this.billVersion;
+    }
+
+    public void setBillVersion(final long version) {
+        this.billVersion = version;
+    }
+
+    public long getBillRevision() {
+        return this.billRevision;
+    }
+
+    public void setBillRevision(final long revision) {
+        this.billRevision = revision;
+    }
+
+    public boolean equals(final Object obj) {
+        if (obj == this)
+            return true;
+
+        if (!(obj instanceof UnenhancedBootstrapInstanceId))
+            return false;
+
+        final UnenhancedBootstrapInstanceId pk = (UnenhancedBootstrapInstanceId) obj;
+
+        if (billNumber != pk.billNumber)
+            return false;
+
+        if (billVersion != pk.billVersion)
+            return false;
+
+        if (billRevision != pk.billRevision)
+            return false;
+
+        return true;
+    }
+
+    public int hashCode() {
+        return (billNumber + "." + billVersion + "." + billRevision).hashCode();
+    }
+}

openjpa-persistence-jdbc/src/test/java/org/apache/openjpa/enhance/UnenhancedFieldAccess.java

@@ -42,6 +42,8 @@ public class UnenhancedFieldAccess
     @Version public int version;
     protected String stringField = "foo";
 
+    private long longVal;
+
     @Basic(fetch = FetchType.LAZY)
     private String lazyField = "lazy";
 
@@ -65,6 +67,15 @@ public class UnenhancedFieldAccess
         return lazyField;
     }
 
+
+    public long getLongVal() {
+        return longVal;
+    }
+
+    public void setLongVal(long longVal) {
+        this.longVal = longVal;
+    }
+
     @Override
     public boolean equals(Object o) {
         if (o == this)