Program: 64276
Project: 64276
Buggy source:
/** 
 * Execute P4 command assembled by subclasses.
 * @param command The command to run
 * @param p4input Input to be fed to command on stdin
 * @param handler A P4Handler to process any input and output
 */
protected void execP4Command(String command,P4Handler handler) throws BuildException {
  try {
    Commandline commandline=new Commandline();
    commandline.setExecutable("String_Node_Str");
    if (P4Port != null && P4Port.length() != 0) {
      commandline.createArgument().setValue(P4Port);
    }
    if (P4User != null && P4User.length() != 0) {
      commandline.createArgument().setValue(P4User);
    }
    if (P4Client != null && P4Client.length() != 0) {
      commandline.createArgument().setValue(P4Client);
    }
    commandline.createArgument().setLine(command);
    String[] cmdline=commandline.getCommandline();
    String cmdl="String_Node_Str";
    for (int i=0; i < cmdline.length; i++) {
      cmdl+=cmdline[i] + "String_Node_Str";
    }
    log(cmdl.describeCommand(),Project.MSG_VERBOSE);
    if (handler == null) {
      handler=new SimpleP4OutputHandler(this);
    }
    Execute exe=new Execute(handler,null);
    exe.setAntRun(project);
    exe.setCommandline(commandline.getCommandline());
    try {
      exe.execute();
    }
 catch (    IOException e) {
      throw new BuildException(e);
    }
 finally {
      try {
        handler.stop();
      }
 catch (      Exception e) {
      }
    }
  }
 catch (  Exception e) {
    String failMsg="String_Node_Str" + e.getMessage();
    if (failOnError) {
      throw new BuildException(failMsg);
    }
 else {
      log(failMsg,Project.MSG_ERR);
    }
  }
}

Fixed version (ground truth):
/** 
 * Execute P4 command assembled by subclasses.
 * @param command The command to run
 * @param p4input Input to be fed to command on stdin
 * @param handler A P4Handler to process any input and output
 */
protected void execP4Command(String command,P4Handler handler) throws BuildException {
  try {
    Commandline commandline=new Commandline();
    commandline.setExecutable("String_Node_Str");
    if (P4Port != null && P4Port.length() != 0) {
      commandline.createArgument().setValue(P4Port);
    }
    if (P4User != null && P4User.length() != 0) {
      commandline.createArgument().setValue(P4User);
    }
    if (P4Client != null && P4Client.length() != 0) {
      commandline.createArgument().setValue(P4Client);
    }
    commandline.createArgument().setLine(command);
    String[] cmdline=commandline.getCommandline();
    String cmdl="String_Node_Str";
    for (int i=0; i < cmdline.length; i++) {
      cmdl+=cmdline[i] + "String_Node_Str";
    }
    log(commandline.describeCommand(),Project.MSG_VERBOSE);
    if (handler == null) {
      handler=new SimpleP4OutputHandler(this);
    }
    Execute exe=new Execute(handler,null);
    exe.setAntRun(project);
    exe.setCommandline(commandline.getCommandline());
    try {
      exe.execute();
    }
 catch (    IOException e) {
      throw new BuildException(e);
    }
 finally {
      try {
        handler.stop();
      }
 catch (      Exception e) {
      }
    }
  }
 catch (  Exception e) {
    String failMsg="String_Node_Str" + e.getMessage();
    if (failOnError) {
      throw new BuildException(failMsg);
    }
 else {
      log(failMsg,Project.MSG_ERR);
    }
  }
}