Program: 9105
Project: 9105
Buggy source:
/** 
 * Run the compile in the same VM by loading the compiler (Main), setting up any message holders, doing the compile, and converting abort/failure and error messages to BuildException, as appropriate.
 * @throws BuildException if abort or failure messages or if errors and failonerror.
 */
protected void executeInSameVM(String[] args){
  if (null != maxMem) {
    log("String_Node_Str" + maxMem,Project.MSG_WARN);
  }
  IMessageHolder holder=messageHolder;
  int numPreviousErrors;
  if (null == holder) {
    MessageHandler mhandler=new MessageHandler(true);
    final IMessageHandler delegate;
    delegate=new AntMessageHandler(this.logger,this.verbose,false);
    mhandler.setInterceptor(delegate);
    holder=mhandler;
    numPreviousErrors=0;
  }
 else {
    numPreviousErrors=holder.numMessages(IMessage.ERROR,true);
  }
{
    Main newmain=new Main();
    newmain.setHolder(holder);
    newmain.setCompletionRunner(new Runnable(){
      public void run(){
        doCompletionTasks();
      }
    }
);
    if (null != main) {
      MessageUtil.fail(holder,"String_Node_Str");
      return;
    }
    main=newmain;
  }
  main.runMain(args,false);
  if (failonerror) {
    int errs=holder.numMessages(IMessage.ERROR,false);
    errs-=numPreviousErrors;
    if (0 < errs) {
      String m=errs + "String_Node_Str";
      MessageUtil.print(System.err,holder,"String_Node_Str",MessageUtil.MESSAGE_ALL,MessageUtil.PICK_ERROR,true);
      throw new BuildException(m);
    }
  }
{
    IMessage[] fails=holder.getMessages(IMessage.FAIL,true);
    if (!LangUtil.isEmpty(fails)) {
      StringBuffer sb=new StringBuffer();
      String prefix="String_Node_Str";
      int numThrown=0;
      for (int i=0; i < fails.length; i++) {
        String message=fails[i].getMessage();
        if (LangUtil.isEmpty(message)) {
          message="String_Node_Str";
        }
 else         if (-1 != message.indexOf(USAGE_SUBSTRING)) {
          continue;
        }
        Throwable t=fails[i].getThrown();
        if (null != t) {
          numThrown++;
          sb.append(prefix);
          sb.append(LangUtil.unqualifiedClassName(t.getClass()));
          String thrownMessage=t.getMessage();
          if (!LangUtil.isEmpty(thrownMessage)) {
            sb.append("String_Node_Str" + thrownMessage + "String_Node_Str");
          }
        }
        sb.append("String_Node_Str" + message + "String_Node_Str");
        prefix="String_Node_Str";
      }
      if (0 < sb.length()) {
        sb.append("String_Node_Str" + numThrown + "String_Node_Str");
        throw new BuildException(sb.toString());
      }
    }
  }
}

Fixed version (ground truth):
/** 
 * Run the compile in the same VM by loading the compiler (Main), setting up any message holders, doing the compile, and converting abort/failure and error messages to BuildException, as appropriate.
 * @throws BuildException if abort or failure messages or if errors and failonerror.
 */
protected void executeInSameVM(String[] args){
  if (null != maxMem) {
    log("String_Node_Str" + maxMem,Project.MSG_WARN);
  }
  IMessageHolder holder=messageHolder;
  int numPreviousErrors;
  if (null == holder) {
    MessageHandler mhandler=new MessageHandler(true);
    final IMessageHandler delegate;
    delegate=new AntMessageHandler(this.logger,this.verbose,false);
    mhandler.setInterceptor(delegate);
    holder=mhandler;
    numPreviousErrors=0;
  }
 else {
    numPreviousErrors=holder.numMessages(IMessage.ERROR,true);
  }
{
    Main newmain=new Main();
    newmain.setHolder(holder);
    newmain.setCompletionRunner(new Runnable(){
      @Override public void run(){
        doCompletionTasks();
      }
    }
);
    if (null != main) {
      MessageUtil.fail(holder,"String_Node_Str");
      return;
    }
    main=newmain;
  }
  main.runMain(args,false);
  if (failonerror) {
    int errs=holder.numMessages(IMessage.ERROR,false);
    errs-=numPreviousErrors;
    if (0 < errs) {
      String m=errs + "String_Node_Str";
      MessageUtil.print(System.err,holder,"String_Node_Str",MessageUtil.MESSAGE_ALL,MessageUtil.PICK_ERROR,true);
      throw new BuildException(m);
    }
  }
{
    IMessage[] fails=holder.getMessages(IMessage.FAIL,true);
    if (!LangUtil.isEmpty(fails)) {
      StringBuffer sb=new StringBuffer();
      String prefix="String_Node_Str";
      int numThrown=0;
      for (int i=0; i < fails.length; i++) {
        String message=fails[i].getMessage();
        if (LangUtil.isEmpty(message)) {
          message="String_Node_Str";
        }
 else         if (-1 != message.indexOf(USAGE_SUBSTRING)) {
          continue;
        }
        Throwable t=fails[i].getThrown();
        if (null != t) {
          numThrown++;
          sb.append(prefix);
          sb.append(LangUtil.unqualifiedClassName(t.getClass()));
          String thrownMessage=t.getMessage();
          if (!LangUtil.isEmpty(thrownMessage)) {
            sb.append("String_Node_Str" + thrownMessage + "String_Node_Str");
          }
        }
        sb.append("String_Node_Str" + message + "String_Node_Str");
        prefix="String_Node_Str";
      }
      if (0 < sb.length()) {
        sb.append("String_Node_Str" + numThrown + "String_Node_Str");
        throw new BuildException(sb.toString());
      }
    }
  }
}