Examples of org.apache.commons.exec.DefaultExecutor

org.apache.commons.exec.DefaultExecutor
The default class to start a subprocess. The implementation allows to
- set a current working directory for the subprocess
- provide a set of environment variables passed to the subprocess
- capture the subprocess output of stdout and stderr using an ExecuteStreamHandler
- kill long-running processes using an ExecuteWatchdog
- define a set of expected exit values
- terminate any started processes when the main process is terminating using a ProcessDestroyer
The following example shows the basic usage:
```
 Executor exec = new DefaultExecutor(); CommandLine cl = new CommandLine("ls -l"); int exitvalue = exec.execute(cl); 
```

public class ExecWorkItemHandler implements WorkItemHandler {


  public void executeWorkItem(WorkItem workItem, WorkItemManager manager) {
    String command = (String) workItem.getParameter("Command");
    CommandLine commandLine = CommandLine.parse(command);
    DefaultExecutor executor = new DefaultExecutor();
    try {
      executor.execute(commandLine);
      manager.completeWorkItem(workItem.getId(), null);
    } catch (Throwable t) {
      t.printStackTrace();
      manager.abortWorkItem(workItem.getId());
    }

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                log.info("Process execution complete, exit code=" + result);
            }
        };


        final String vmOptions = config.getProperty(PROP_VM_OPTIONS);
        executor = new DefaultExecutor();
        final CommandLine cl = new CommandLine(jvmFullPath);
        if (vmOptions != null && vmOptions.length() > 0) {
            cl.addArguments(vmOptions);
        }
        cl.addArgument("-jar");

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      }
    };
    
    streamHandler = new PumpStreamHandler(outStream, errStream);
    
    executor = new DefaultExecutor();
    executor.setStreamHandler(streamHandler);


  }

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    CommandLine cmd = new CommandLine(cmdlist[0]);
    for (int i = 1; i < cmdlist.length; i++) {
      cmd.addArgument(cmdlist[i]);
    }


    DefaultExecutor exec = new DefaultExecutor();
    exec.execute(cmd);
  }

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        if (clojureArgs != null) {
            cl.addArguments(clojureArgs, false);
        }
        
        Executor exec = new DefaultExecutor();
        Map<String,String> env = new HashMap<String,String>(System.getenv());
        env.put("path", ";");
        env.put("path", System.getProperty("java.home"));
        
        ExecuteStreamHandler handler = new CustomPumpStreamHandler(System.out, System.err, System.in);
        exec.setStreamHandler(handler);
        
        int status;
        try {
            status = exec.execute(cl, env);
        } catch (ExecuteException e) {
            status = e.getExitValue();
        } catch(IOException e) {
            status = 1;
        }

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            cl.addArguments(clojureArgs, false);
        }


        getLog().debug("Command line: " + cl.toString());


        Executor exec = new DefaultExecutor();
        Map<String, String> env = new HashMap<String, String>(System.getenv());
//        env.put("path", ";");
//        env.put("path", System.getProperty("java.home"));


        ExecuteStreamHandler handler = new PumpStreamHandler(System.out, System.err, System.in);
        exec.setStreamHandler(handler);
        exec.setWorkingDirectory(getWorkingDirectory());


        int status;
        try {
            status = exec.execute(cl, env);
        } catch (ExecuteException e) {
            status = e.getExitValue();
        } catch (IOException e) {
            status = 1;
        }

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public class ExecWorkItemHandler implements WorkItemHandler {


  public void executeWorkItem(WorkItem workItem, WorkItemManager manager) {
    String command = (String) workItem.getParameter("Command");
    CommandLine commandLine = CommandLine.parse(command);
    DefaultExecutor executor = new DefaultExecutor();
    try {
      executor.execute(commandLine);
      manager.completeWorkItem(workItem.getId(), null);
    } catch (Throwable t) {
      t.printStackTrace();
      manager.abortWorkItem(workItem.getId());
    }

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      // set timeout
      ExecuteWatchdog watchdog = new ExecuteWatchdog(timeout);




      // create executor
      DefaultExecutor executor = new DefaultExecutor();


      executor.setExitValue(this.exitCode);


      this.baos = new ByteArrayOutputStream();


      this.baosErr = new ByteArrayOutputStream();


      if(this.writerStdIn)
      {
        this.bais = new ByteArrayInputStream(in.getText().getBytes());


        executor.setStreamHandler(new PumpStreamHandler(this.baos, this.baosErr, this.bais));
      }
      else
      {
        executor.setStreamHandler(new PumpStreamHandler(this.baos, this.baosErr));
      }


      executor.setWatchdog(watchdog);


      executor.execute(commandLine, new ExecuteResultHandler(){


        public void onProcessComplete(int e) 
        {
          out.setText(baos.toString());
        }

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        return null;
    }


    private String exec(File workingDir, org.apache.commons.exec.CommandLine cmdLine) throws Exception {
        Executor executor = new DefaultExecutor();
        org.apache.commons.io.output.ByteArrayOutputStream buffer = new org.apache.commons.io.output.ByteArrayOutputStream();
        NullOutputStream nullOs = new NullOutputStream();
        PumpStreamHandler streamHandler = new PumpStreamHandler(nullOs, buffer);
        executor.setWorkingDirectory(workingDir);
        executor.setStreamHandler(streamHandler);
        String result = "";


        try {
            exec(executor, cmdLine);
            result = buffer.toString();

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            }
        }
    }


    protected void killPid(String pid) throws IOException {
        Executor executor = new DefaultExecutor();
        executor.setWorkingDirectory(getBinDir());
        PumpStreamHandler streamHandler = new PumpStreamHandler(createNullOutputStream(), createNullOutputStream());
        executor.setStreamHandler(streamHandler);
        org.apache.commons.exec.CommandLine commandLine;


        commandLine = new org.apache.commons.exec.CommandLine("kill").addArgument(pid);
        executor.execute(commandLine);
    }

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