Program: 64313
Project: 64313
Buggy source:
public void execute() throws BuildException {
  checkConfiguration();
  Vector files=getFileList();
  if (isUpToDate(files)) {
    return;
  }
  log("String_Node_Str" + archiveType + "String_Node_Str"+ cabFile.getAbsolutePath());
  if (!Os.isFamily("String_Node_Str")) {
    log("String_Node_Str",Project.MSG_VERBOSE);
    StringBuffer sb=new StringBuffer();
    Enumeration fileEnum=files.elements();
    while (fileEnum.hasMoreElements()) {
      sb.append(fileEnum.nextElement()).append("String_Node_Str");
    }
    sb.append("String_Node_Str").append(cabFile.getAbsolutePath()).append("String_Node_Str");
    try {
      Process p=Runtime.getRuntime().exec("String_Node_Str");
      OutputStream out=p.getOutputStream();
      out.write(sb.toString().getBytes());
      out.flush();
      out.close();
    }
 catch (    IOException ex) {
      String msg="String_Node_Str" + cabFile + "String_Node_Str"+ ex.getMessage();
      throw new BuildException(msg);
    }
  }
 else {
    try {
      File listFile=createListFile(files);
      ExecTask exec=createExec();
      File outFile=null;
      exec.setFailonerror(true);
      exec.setDir(baseDir);
      if (!doVerbose) {
        outFile=fileUtils.createTempFile("String_Node_Str","String_Node_Str",null);
        exec.setOutput(outFile);
      }
      exec.setCommand(createCommand(listFile));
      exec.execute();
      if (outFile != null) {
        outFile.delete();
      }
      listFile.delete();
    }
 catch (    IOException ioe) {
      String msg="String_Node_Str" + cabFile + "String_Node_Str"+ ioe.getMessage();
      throw new BuildException(msg);
    }
  }
}

Fixed version (ground truth):
public void execute() throws BuildException {
  checkConfiguration();
  Vector files=getFileList();
  if (isUpToDate(files)) {
    return;
  }
  log("String_Node_Str" + archiveType + "String_Node_Str"+ cabFile.getAbsolutePath());
  if (!Os.isFamily("String_Node_Str")) {
    log("String_Node_Str",Project.MSG_VERBOSE);
    StringBuffer sb=new StringBuffer();
    Enumeration fileEnum=files.elements();
    while (fileEnum.hasMoreElements()) {
      sb.append(fileEnum.nextElement()).append("String_Node_Str");
    }
    sb.append("String_Node_Str").append(cabFile.getAbsolutePath()).append("String_Node_Str");
    try {
      Process p=Execute.launch(getProject(),new String[]{"String_Node_Str"},null,baseDir,true);
      OutputStream out=p.getOutputStream();
      out.write(sb.toString().getBytes());
      out.flush();
      out.close();
      LogOutputStream outLog=new LogOutputStream(this,Project.MSG_VERBOSE);
      LogOutputStream errLog=new LogOutputStream(this,Project.MSG_ERR);
      StreamPumper outPump=new StreamPumper(p.getInputStream(),outLog);
      StreamPumper errPump=new StreamPumper(p.getErrorStream(),errLog);
      (new Thread(outPump)).start();
      (new Thread(errPump)).start();
      int result=-99;
      try {
        result=p.waitFor();
        outPump.waitFor();
        outLog.close();
        errPump.waitFor();
        errLog.close();
      }
 catch (      InterruptedException ie) {
        log("String_Node_Str" + ie);
      }
      if (result != 0) {
        log("String_Node_Str" + result);
      }
    }
 catch (    IOException ex) {
      String msg="String_Node_Str" + cabFile + "String_Node_Str"+ ex.getMessage();
      throw new BuildException(msg);
    }
  }
 else {
    try {
      File listFile=createListFile(files);
      ExecTask exec=createExec();
      File outFile=null;
      exec.setFailonerror(true);
      exec.setDir(baseDir);
      if (!doVerbose) {
        outFile=fileUtils.createTempFile("String_Node_Str","String_Node_Str",null);
        exec.setOutput(outFile);
      }
      exec.setCommand(createCommand(listFile));
      exec.execute();
      if (outFile != null) {
        outFile.delete();
      }
      listFile.delete();
    }
 catch (    IOException ioe) {
      String msg="String_Node_Str" + cabFile + "String_Node_Str"+ ioe.getMessage();
      throw new BuildException(msg);
    }
  }
}