Starting a jar with Processbuilder does not work properly

Question

I have the following code:

ProcessBuilder pb = new ProcessBuilder( "java", "-jar", "test.jar", Integer.toString( jobId ), Integer.toString( software ), Integer.toString( entryPoint ), application );
pb.directory( new File("/home/userName/TestBSC") );
Process proc = pb.start();

When running the jar file from my terminal using this command:

java -jar test.jar 135 3 3 appName

Then it works like a charm. The box pushes some things in my database, so I see that it works. But when I do this from my JavaServlet with the above processBuilder code, I am not getting any data in my database, and I am not getting any errors either.

However, the process itself is running, I checked it with "ps ax" in my terminal. So I wonder where is the difference here? What am I doing wrong?

Does anyone have an idea?

Edit: more Code:

ProcessBuilder pb = new ProcessBuilder( "java", "-jar", "test.jar", Integer.toString( jobId ), Integer.toString( software ), Integer.toString( entryPoint ), application );
pb.directory( new File("/home/userName/TestBSC") );
Process proc = pb.start();

System.out.println( "Job running" );
proc.waitFor(); // wait until jar is finished
System.out.println( "Job finished" );

InputStream in = proc.getInputStream();
InputStream err = proc.getErrorStream();

byte result[] = new byte[ in.available() ];
in.read( result, 0, result.length );
System.out.println( new String( result ) );

byte error[] = new byte[ err.available() ];
err.read( error, 0, error.length );
System.out.println( new String( error ) );

---

UPDATE:

shell- script . script java .

script :

java -jar test.jar "$1" "$2" "$3" "$4"

, . :

gnome-terminal -x java -jar test.jar "$1" "$2" "$3" "$4"

!! gnome, jar .

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Answer 1

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:

• InputStreamConsumerThread /;

  public class InputStreamConsumerThread extends Thread
  {
    private InputStream is;
    private boolean sysout;
    private StringBuilder output = new StringBuilder();
  
    public InputStreamConsumerThread (InputStream is, boolean sysout)
    {
      this.is=is;
      this.sysout=sysout;
    }
  
    public void run()
    {
      try(BufferedReader br = new BufferedReader(new InputStreamReader(is)))
      {
        for (String line = br.readLine(); line != null; line = br.readLine())
        {
          if (sysout)
            System.out.println(line);    
          output.append(line).append("\n");
        }
      }
    }
    public String getOutput(){
      return output.toString();
    }
  }
  

  ;

  String systemProperties = "-Dkey=value";    
  ProcessBuilder pb = new ProcessBuilder( "java", systemProperties, "-jar", "test.jar", Integer.toString( jobId ), Integer.toString( software ), Integer.toString( entryPoint ), application );
  pb.directory( new File("/home/userName/TestBSC") );
  Process proc = pb.start();
  
  InputStreamConsumerThread inputConsumer = 
       new InputStreamConsumerThread(proc.getInputStream(), true);
  InputStreamConsumerThread errorConsumer = 
       new InputStreamConsumerThread(proc.getErrorStream(), true);
  
  inputConsumer.start();
  errorConsumer.start();
  
  System.out.println( "Job running" );
  proc.waitFor(); // wait until jar is finished
  System.out.println( "Job finished" );
  
  String processOutput = inputConsumer.getOutput();
  String processError = errorConsumer.getOutput();
  
  if(!processOutput.isEmpty()){
      //there were some output
  }
  
  if(!processError.isEmpty()){
      //there were some error
  }
  

• ProcessBuilder . , - , ProcessBuilder.Redirect.INHERIT :

  ProcessBuilder pb = new ProcessBuilder( "java", "-jar", "test.jar", Integer.toString( jobId ), Integer.toString( software ), Integer.toString( entryPoint ), application );
  pb.directory( new File("/home/userName/TestBSC") );
  pb.redirectErrorStream(true); // redirect error stream to output stream
  pb.redirectOutput(ProcessBuilder.Redirect.INHERIT);
  Process proc = pb.start();
  
  System.out.println( "Job running" );
  //since process builder will handle the streams for us
  //we can call waitFor() safely
  proc.waitFor(); 
  System.out.println( "Job finished" );
  

• . ProcessBuilder , , , .

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  . JRE, Runtime.exec() ProcessBuilder. Apache Commons Exec. (YAPL).

  / stderr to stdout - API () API SLF4J

  ^{ZT Process Executor}

API Java Process, JavaWorld Runtime.exec() .

Answer 2

?

UPDATE

:

// Java runtime
Runtime runtime = Runtime.getRuntime();
// Command
String[] command = {"java", "-jar", "test.jar", Integer.toString( jobId ), Integer.toString( software ), Integer.toString( entryPoint ), application};
// Process
Process process = runtime.exec(command, null, new File("/home/userName/TestBSC"));