Apache commandline java.io.IOException

import org.apache.commons.exec.CommandLine;

import org.apache.commons.exec.DefaultExecutor;

import org.apache.commons.exec.PumpStreamHandler;

import java.io.*;

public class ApacheCommandLineTest {

    public static void main(String[] args) {

        String cmd = "source /opt/app/app.cfg";

        CommandLine commandline = new CommandLine(cmd);

        FileOutputStream fileOutputStream = null;

        try {

            fileOutputStream = new FileOutputStream("test.log", true);

        } catch (FileNotFoundException e) {

            e.printStackTrace();

        }

        PumpStreamHandler streamHandler = new PumpStreamHandler(fileOutputStream, fileOutputStream, null);

        DefaultExecutor exec = new DefaultExecutor();

        exec.setExitValues(null);

        exec.setStreamHandler(streamHandler);

        try {

            int exitValue = exec.execute(commandline);  // exit code: 0=success, 1=error

            System.out.println(exitValue);

        } catch (IOException e) {

            e.printStackTrace();

        }

    }

}

java.io.IOException: Cannot run program "source \opt\app\app.cfg" (in directory "."): CreateProcess error=2, The system cannot find the file specified

	at java.lang.ProcessBuilder.start(ProcessBuilder.java:1048)

	at java.lang.Runtime.exec(Runtime.java:620)

	at org.apache.commons.exec.launcher.Java13CommandLauncher.exec(Java13CommandLauncher.java:61)

	at org.apache.commons.exec.DefaultExecutor.launch(DefaultExecutor.java:279)

	at org.apache.commons.exec.DefaultExecutor.executeInternal(DefaultExecutor.java:336)

	at org.apache.commons.exec.DefaultExecutor.execute(DefaultExecutor.java:166)

	at org.apache.commons.exec.DefaultExecutor.execute(DefaultExecutor.java:153)

	at com.xxl.job.core.handler.impl.ApacheCommandLineTest.main(ApacheCommandLineTest.java:36)

Caused by: java.io.IOException: CreateProcess error=2, The system cannot find the file specified

	at java.lang.ProcessImpl.create(Native Method)

	at java.lang.ProcessImpl.<init>(ProcessImpl.java:386)

	at java.lang.ProcessImpl.start(ProcessImpl.java:137)

	at java.lang.ProcessBuilder.start(ProcessBuilder.java:1029)

	... 7 more

public static void main(String[] args) {

        CommandLine commandline1 = CommandLine.parse("/bin/bash " + "test.sh");

        FileOutputStream fileOutputStream = null;

        try {

            fileOutputStream = new FileOutputStream("test.log", true);

        } catch (FileNotFoundException e) {

            e.printStackTrace();

        }

        PumpStreamHandler streamHandler = new PumpStreamHandler(fileOutputStream, fileOutputStream, null);

        // exec

        DefaultExecutor exec = new DefaultExecutor();

        exec.setExitValues(null);

        exec.setStreamHandler(streamHandler);

        try {

            int exitValue1 = exec.execute(commandline1);  // exit code: 0=success, 1=error

            System.out.println(exitValue1);

        } catch (IOException e) {

            e.printStackTrace();

        }

    }