java – commons-exec：当我调用executor.execute(commandLine)

import java.io.DataInputStream;
import java.io.IOException;
import java.io.PipedInputStream;
import java.io.PipedOutputStream;
import org.apache.commons.exec.CommandLine;
import org.apache.commons.exec.DefaultExecutor;
import org.apache.commons.exec.ExecuteException;
import org.apache.commons.exec.PumpStreamHandler;
public class test {

public static void main(String[] args) {
    String command = "java";

    PipedOutputStream output = new PipedOutputStream();
    PumpStreamHandler psh = new PumpStreamHandler(output);

    CommandLine cl = CommandLine.parse(command);

    DefaultExecutor exec = new DefaultExecutor();
    DataInputStream is = null;
    try {
        is = new DataInputStream(new PipedInputStream(output));
        exec.setStreamHandler(psh);
        exec.execute(cl);
    } catch (ExecuteException ex) {
    } catch (IOException ex) {
    }

    System.out.println("huh?");
}
}