Program: 44583
Project: 44583
Buggy source:
/** 
 * {@inheritDoc}
 */
@Override protected JCodeModel generateModel() throws IllegalStateException {
  final JCodeModel codeModel=super.generateModel();
  definedClass().constructor(JMod.PROTECTED);
  ClassModelUtil.createReadResolveMethod(definedClass());
  addValidator(new MessageIdValidator(methodDescriptor));
  for (  MethodDescriptor methodDesc : methodDescriptor) {
    final JClass returnType=codeModel.ref(methodDesc.returnTypeAsString());
    final JMethod jMethod=definedClass().method(JMod.PUBLIC | JMod.FINAL,returnType,methodDesc.name());
    jMethod.annotate(Override.class);
    final Message message=methodDesc.message();
    final JMethod msgMethod=addMessageMethod(methodDesc.name(),message.value(),message.id());
    final JBlock body=jMethod.body();
    final JClass returnField=codeModel.ref(returnType.fullName());
    final JVar result=body.decl(returnField,"String_Node_Str");
    JClass formatter=null;
switch (message.format()) {
case MESSAGE_FORMAT:
      formatter=codeModel.ref(java.text.MessageFormat.class);
    break;
case PRINTF:
  formatter=codeModel.ref(String.class);
break;
}
final JInvocation formatterMethod=formatter.staticInvoke("String_Node_Str");
formatterMethod.arg(JExpr.invoke(msgMethod));
for (VariableElement param : methodDesc.parameters()) {
final JClass paramType=codeModel.ref(param.asType().toString());
JVar paramVar=jMethod.param(JMod.FINAL,paramType,param.getSimpleName().toString());
formatterMethod.arg(paramVar);
}
if (methodDesc.hasClause() && codeModel.ref(Throwable.class).isAssignableFrom(returnField)) {
result.init(JExpr._new(returnField));
JInvocation inv=body.invoke(result,"String_Node_Str");
inv.arg(JExpr.ref(methodDesc.causeVarName()));
}
 else {
result.init(formatterMethod);
}
body._return(result);
}
return codeModel;
}

Fixed version (ground truth):
/** 
 * {@inheritDoc}
 */
@Override protected JCodeModel generateModel() throws IllegalStateException {
  final JCodeModel codeModel=super.generateModel();
  definedClass().constructor(JMod.PROTECTED);
  ClassModelUtil.createReadResolveMethod(definedClass());
  for (  MethodDescriptor methodDesc : methodDescriptor) {
    final JClass returnType=codeModel.ref(methodDesc.returnTypeAsString());
    final JMethod jMethod=definedClass().method(JMod.PUBLIC | JMod.FINAL,returnType,methodDesc.name());
    jMethod.annotate(Override.class);
    final Message message=methodDesc.message();
    final JMethod msgMethod=addMessageMethod(methodDesc.name(),message.value());
    final JVar messageIdVar=addIdVar(methodDesc.name(),message.id());
    final JBlock body=jMethod.body();
    final JClass returnField=codeModel.ref(returnType.fullName());
    final JVar result=body.decl(returnField,"String_Node_Str");
    JClass formatter=null;
switch (message.format()) {
case MESSAGE_FORMAT:
      formatter=codeModel.ref(java.text.MessageFormat.class);
    break;
case PRINTF:
  formatter=codeModel.ref(String.class);
break;
}
final JInvocation formatterMethod=formatter.staticInvoke("String_Node_Str");
if (messageIdVar == null) {
formatterMethod.arg(JExpr.invoke(msgMethod));
}
 else {
formatterMethod.arg(messageIdVar.plus(JExpr.invoke(msgMethod)));
}
for (VariableElement param : methodDesc.parameters()) {
final JClass paramType=codeModel.ref(param.asType().toString());
JVar paramVar=jMethod.param(JMod.FINAL,paramType,param.getSimpleName().toString());
formatterMethod.arg(paramVar);
}
if (methodDesc.hasClause() && codeModel.ref(Throwable.class).isAssignableFrom(returnField)) {
result.init(JExpr._new(returnField));
JInvocation inv=body.invoke(result,"String_Node_Str");
inv.arg(JExpr.ref(methodDesc.causeVarName()));
}
 else {
result.init(formatterMethod);
}
body._return(result);
}
return codeModel;
}