Program: 155880
Project: 155880
Buggy source:
@Override public boolean process(Set<? extends TypeElement> annotations,RoundEnvironment roundEnv){
  for (  Element classElement : roundEnv.getElementsAnnotatedWith(Ignore.class)) {
    if (!classElement.getKind().equals(ElementKind.FIELD)) {
      error("String_Node_Str");
      return false;
    }
    if (!codeGenerator.add_Ignore(classElement.getSimpleName().toString())) {
      error(codeGenerator.getError());
      return false;
    }
  }
  for (  Element classElement : roundEnv.getElementsAnnotatedWith(RealmClass.class)) {
    if (!classElement.getKind().equals(ElementKind.CLASS)) {
      error("String_Node_Str");
      return false;
    }
    TypeElement typeElement=(TypeElement)classElement;
    Element enclosingElement=typeElement.getEnclosingElement();
    if (!enclosingElement.getKind().equals(ElementKind.PACKAGE)) {
      error("String_Node_Str");
      return false;
    }
    try {
      PackageElement packageElement=(PackageElement)enclosingElement;
      String qName=packageElement.getQualifiedName().toString();
      if (qName != null) {
        String qualifiedClassName=qName + "String_Node_Str" + classElement.getSimpleName()+ "String_Node_Str";
        qualifiedClassName=qualifiedClassName.replace("String_Node_Str","String_Node_Str");
        JavaFileObject jfo=processingEnv.getFiler().createSourceFile(qualifiedClassName);
        codeGenerator.setBufferedWriter(new BufferedWriter(jfo.openWriter()));
        if (!codeGenerator.setPackageName(qName)) {
          error(codeGenerator.getError());
          return false;
        }
        if (!codeGenerator.setClassName(classElement.getSimpleName().toString())) {
          error(codeGenerator.getError());
          return false;
        }
        for (        Element element : typeElement.getEnclosedElements()) {
          if (element.getKind().equals(ElementKind.FIELD)) {
            String elementName=element.getSimpleName().toString();
            VariableElement varElem=(VariableElement)element;
            Set<Modifier> modifiers=varElem.getModifiers();
            for (Iterator<Modifier> m=modifiers.iterator(); m.hasNext(); ) {
              Modifier modifier=m.next();
              if (modifier == Modifier.PRIVATE) {
                if (!codeGenerator.add_Field(elementName,varElem)) {
                  error(codeGenerator.getError());
                  return false;
                }
              }
            }
          }
        }
        if (!codeGenerator.generate()) {
          error(codeGenerator.getError());
          return false;
        }
      }
    }
 catch (    IOException ex) {
      error("String_Node_Str" + ex.getMessage());
    }
  }
  return true;
}

Fixed version (ground truth):
@Override public boolean process(Set<? extends TypeElement> annotations,RoundEnvironment roundEnv){
  for (  Element classElement : roundEnv.getElementsAnnotatedWith(Ignore.class)) {
    if (!classElement.getKind().equals(ElementKind.FIELD)) {
      error("String_Node_Str");
      return false;
    }
    if (!codeGenerator.add_Ignore(classElement.getSimpleName().toString())) {
      error(codeGenerator.getError());
      return false;
    }
  }
  for (  Element classElement : roundEnv.getElementsAnnotatedWith(RealmClass.class)) {
    if (!classElement.getKind().equals(ElementKind.CLASS)) {
      error("String_Node_Str");
      return false;
    }
    TypeElement typeElement=(TypeElement)classElement;
    Element enclosingElement=typeElement.getEnclosingElement();
    if (!enclosingElement.getKind().equals(ElementKind.PACKAGE)) {
      error("String_Node_Str");
      return false;
    }
    try {
      PackageElement packageElement=(PackageElement)enclosingElement;
      String qName=packageElement.getQualifiedName().toString();
      if (qName != null) {
        String qualifiedClassName=qName + "String_Node_Str" + classElement.getSimpleName()+ "String_Node_Str";
        qualifiedClassName=qualifiedClassName.replace("String_Node_Str","String_Node_Str");
        JavaFileObject jfo=processingEnv.getFiler().createSourceFile(qualifiedClassName);
        codeGenerator.setBufferedWriter(new BufferedWriter(jfo.openWriter()));
        if (!codeGenerator.setPackageName(qName)) {
          error(codeGenerator.getError());
          return false;
        }
        if (!codeGenerator.setClassName(classElement.getSimpleName().toString())) {
          error(codeGenerator.getError());
          return false;
        }
        for (        Element element : typeElement.getEnclosedElements()) {
          if (element.getKind().equals(ElementKind.FIELD)) {
            String elementName=element.getSimpleName().toString();
            VariableElement varElem=(VariableElement)element;
            Set<Modifier> modifiers=varElem.getModifiers();
            for (Iterator<Modifier> m=modifiers.iterator(); m.hasNext(); ) {
              Modifier modifier=m.next();
              if (modifier == Modifier.PRIVATE) {
                if (!codeGenerator.setField(elementName,varElem)) {
                  error(codeGenerator.getError());
                  return false;
                }
              }
            }
          }
        }
        if (!codeGenerator.generate()) {
          error(codeGenerator.getError());
          return false;
        }
      }
    }
 catch (    IOException ex) {
      error("String_Node_Str" + ex.getMessage());
    }
  }
  return true;
}