Program: 44586
Project: 44586
Buggy source:
/** 
 * {@inheritDoc}
 */
@Override protected JCodeModel generateModel() throws IllegalStateException {
  final JCodeModel codeModel=super.generateModel();
  log=definedClass().field(JMod.PROTECTED | JMod.FINAL,Logger.class,LOG_FIELD_NAME);
  final JMethod constructor=definedClass().constructor(JMod.PROTECTED);
  final JVar constructorParam=constructor.param(JMod.FINAL,Logger.class,LOG_FIELD_NAME);
  final JBlock body=constructor.body();
  body.directStatement("String_Node_Str" + log.name() + "String_Node_Str"+ constructorParam.name()+ "String_Node_Str");
  addValidator(new MessageIdValidator(methodDescriptor));
  for (  MethodDescriptor methodDesc : methodDescriptor) {
    final String methodName=methodDesc.name();
    final JMethod jMethod=definedClass().method(JMod.PUBLIC | JMod.FINAL,codeModel.VOID,methodName);
    jMethod.annotate(Override.class);
    final Message message=methodDesc.message();
    final LogMessage logMessage=methodDesc.logMessage();
    Logger.Level logLevel=Logger.Level.INFO;
    if (logMessage != null) {
      logLevel=logMessage.level();
    }
    final JMethod msgMethod=addMessageMethod(methodName,message.value(),message.id());
    final StringBuilder logMethod=new StringBuilder(logLevel.name().toLowerCase());
switch (methodDesc.message().format()) {
case MESSAGE_FORMAT:
      logMethod.append("String_Node_Str");
    break;
case PRINTF:
  logMethod.append("String_Node_Str");
break;
}
final JBlock methodBody=jMethod.body();
final JInvocation logInv=methodBody.invoke(log,logMethod.toString());
if (methodDesc.hasClause()) {
logInv.arg(JExpr.direct(methodDesc.causeVarName()));
}
logInv.arg(JExpr.invoke(msgMethod));
for (VariableElement param : methodDesc.parameters()) {
final JClass paramType=codeModel.ref(param.asType().toString());
final JVar var=jMethod.param(JMod.FINAL,paramType,param.getSimpleName().toString());
if (!param.equals(methodDesc.cause())) {
logInv.arg(var);
}
}
}
return codeModel;
}

Fixed version (ground truth):
/** 
 * {@inheritDoc}
 */
@Override protected JCodeModel generateModel() throws IllegalStateException {
  final JCodeModel codeModel=super.generateModel();
  log=definedClass().field(JMod.PROTECTED | JMod.FINAL,Logger.class,LOG_FIELD_NAME);
  final JMethod constructor=definedClass().constructor(JMod.PROTECTED);
  final JVar constructorParam=constructor.param(JMod.FINAL,Logger.class,LOG_FIELD_NAME);
  final JBlock body=constructor.body();
  body.directStatement("String_Node_Str" + log.name() + "String_Node_Str"+ constructorParam.name()+ "String_Node_Str");
  for (  MethodDescriptor methodDesc : methodDescriptor) {
    final String methodName=methodDesc.name();
    final JMethod jMethod=definedClass().method(JMod.PUBLIC | JMod.FINAL,codeModel.VOID,methodName);
    jMethod.annotate(Override.class);
    final Message message=methodDesc.message();
    final LogMessage logMessage=methodDesc.logMessage();
    Logger.Level logLevel=Logger.Level.INFO;
    if (logMessage != null) {
      logLevel=logMessage.level();
    }
    final JMethod msgMethod=addMessageMethod(methodName,message.value());
    final JVar messageIdVar=addIdVar(methodDesc.name(),message.id());
    final StringBuilder logMethod=new StringBuilder(logLevel.name().toLowerCase());
switch (methodDesc.message().format()) {
case MESSAGE_FORMAT:
      logMethod.append("String_Node_Str");
    break;
case PRINTF:
  logMethod.append("String_Node_Str");
break;
}
final JBlock methodBody=jMethod.body();
final JInvocation logInv=methodBody.invoke(log,logMethod.toString());
if (methodDesc.hasClause()) {
logInv.arg(JExpr.direct(methodDesc.causeVarName()));
}
if (messageIdVar == null) {
logInv.arg(JExpr.invoke(msgMethod));
}
 else {
logInv.arg(messageIdVar.plus(JExpr.invoke(msgMethod)));
}
for (VariableElement param : methodDesc.parameters()) {
final JClass paramType=codeModel.ref(param.asType().toString());
final JVar var=jMethod.param(JMod.FINAL,paramType,param.getSimpleName().toString());
if (!param.equals(methodDesc.cause())) {
logInv.arg(var);
}
}
}
return codeModel;
}