Program: 90913
Project: 90913
Buggy source:
/** 
 * Create a RollingFileAppender.
 * @param fileName The name of the file that is actively written to. (required).
 * @param filePattern The pattern of the file name to use on rollover. (required).
 * @param append If true, events are appended to the file. If false, the fileis overwritten when opened. Defaults to "true"
 * @param name The name of the Appender (required).
 * @param bufferedIO When true, I/O will be buffered. Defaults to "true".
 * @param immediateFlush When true, events are immediately flushed. Defaults to "true".
 * @param policy The triggering policy. (required).
 * @param strategy The rollover strategy. Defaults to DefaultRolloverStrategy.
 * @param layout The layout to use (defaults to the default PatternLayout).
 * @param filter The Filter or null.
 * @param suppress "true" if exceptions should be hidden from the application, "false" otherwise.The default is "true".
 * @return A RollingFileAppender.
 */
@PluginFactory public static RollingFileAppender createAppender(@PluginAttr("String_Node_Str") String fileName,@PluginAttr("String_Node_Str") String filePattern,@PluginAttr("String_Node_Str") String append,@PluginAttr("String_Node_Str") String name,@PluginAttr("String_Node_Str") String bufferedIO,@PluginAttr("String_Node_Str") String immediateFlush,@PluginElement("String_Node_Str") TriggeringPolicy policy,@PluginElement("String_Node_Str") RolloverStrategy strategy,@PluginElement("String_Node_Str") Layout layout,@PluginElement("String_Node_Str") Filter filter,@PluginAttr("String_Node_Str") String suppress){
  boolean isAppend=append == null ? true : Boolean.valueOf(append);
  boolean handleExceptions=suppress == null ? true : Boolean.valueOf(suppress);
  boolean isBuffered=bufferedIO == null ? true : Boolean.valueOf(bufferedIO);
  ;
  boolean isFlush=immediateFlush == null ? true : Boolean.valueOf(immediateFlush);
  ;
  if (name == null) {
    LOGGER.error("String_Node_Str");
    return null;
  }
  if (fileName == null) {
    LOGGER.error("String_Node_Str" + name);
    return null;
  }
  if (filePattern == null) {
    LOGGER.error("String_Node_Str" + name);
    return null;
  }
  if (policy == null) {
    LOGGER.error("String_Node_Str");
    return null;
  }
  if (strategy == null) {
    strategy=DefaultRolloverStrategy.createStrategy(null,null);
  }
  RollingFileManager manager=RollingFileManager.getFileManager(fileName,filePattern,isAppend,isBuffered);
  if (manager == null) {
    return null;
  }
  if (layout == null) {
    layout=PatternLayout.createLayout(null,null,null,null);
  }
  return new RollingFileAppender(name,layout,policy,strategy,filter,manager,fileName,filePattern,handleExceptions,isFlush);
}

Fixed version (ground truth):
/** 
 * Create a RollingFileAppender.
 * @param fileName The name of the file that is actively written to. (required).
 * @param filePattern The pattern of the file name to use on rollover. (required).
 * @param append If true, events are appended to the file. If false, the fileis overwritten when opened. Defaults to "true"
 * @param name The name of the Appender (required).
 * @param bufferedIO When true, I/O will be buffered. Defaults to "true".
 * @param immediateFlush When true, events are immediately flushed. Defaults to "true".
 * @param policy The triggering policy. (required).
 * @param strategy The rollover strategy. Defaults to DefaultRolloverStrategy.
 * @param layout The layout to use (defaults to the default PatternLayout).
 * @param filter The Filter or null.
 * @param suppress "true" if exceptions should be hidden from the application, "false" otherwise.The default is "true".
 * @return A RollingFileAppender.
 */
@PluginFactory public static RollingFileAppender createAppender(@PluginAttr("String_Node_Str") String fileName,@PluginAttr("String_Node_Str") String filePattern,@PluginAttr("String_Node_Str") String append,@PluginAttr("String_Node_Str") String name,@PluginAttr("String_Node_Str") String bufferedIO,@PluginAttr("String_Node_Str") String immediateFlush,@PluginElement("String_Node_Str") TriggeringPolicy policy,@PluginElement("String_Node_Str") RolloverStrategy strategy,@PluginElement("String_Node_Str") Layout layout,@PluginElement("String_Node_Str") Filter filter,@PluginAttr("String_Node_Str") String suppress){
  boolean isAppend=append == null ? true : Boolean.valueOf(append);
  boolean handleExceptions=suppress == null ? true : Boolean.valueOf(suppress);
  boolean isBuffered=bufferedIO == null ? true : Boolean.valueOf(bufferedIO);
  boolean isFlush=immediateFlush == null ? true : Boolean.valueOf(immediateFlush);
  if (name == null) {
    LOGGER.error("String_Node_Str");
    return null;
  }
  if (fileName == null) {
    LOGGER.error("String_Node_Str" + name);
    return null;
  }
  if (filePattern == null) {
    LOGGER.error("String_Node_Str" + name);
    return null;
  }
  if (policy == null) {
    LOGGER.error("String_Node_Str");
    return null;
  }
  if (strategy == null) {
    strategy=DefaultRolloverStrategy.createStrategy(null,null);
  }
  RollingFileManager manager=RollingFileManager.getFileManager(fileName,filePattern,isAppend,isBuffered);
  if (manager == null) {
    return null;
  }
  if (layout == null) {
    layout=PatternLayout.createLayout(null,null,null,null);
  }
  return new RollingFileAppender(name,layout,policy,strategy,filter,manager,fileName,filePattern,handleExceptions,isFlush);
}