## org.apache.tools.ant.taskdefs
Class Execute

    java.lang.Object
      |
      +--org.apache.tools.ant.taskdefs.Execute

public class Execute
extends java.lang.Object

Runs an external program.

Since:
  Ant 1.2
Version:
  $Revision: 1.68.2.2 $
Author:
  thomas.haas@softwired-inc.com, Jeff Tulley, Charles Hudak

Field Summary
`static int` `INVALID` Invalid exit code.

Constructor Summary
`Execute()` Creates a new execute object using `PumpStreamHandler` for stream handling.
`Execute(ExecuteStreamHandler streamHandler)` Creates a new execute object.
`Execute(ExecuteStreamHandler streamHandler, ExecuteWatchdog watchdog)` Creates a new execute object.

Method Summary
`int` `execute()` Runs a process defined by the command line and returns its exit status.
`java.lang.String[]` `getCommandline()` Returns the commandline used to create a subprocess.
`java.lang.String[]` `getEnvironment()` Returns the environment used to create a subprocess.
`int` `getExitValue()` Query the exit value of the process.
`static java.util.Vector` `getProcEnvironment()` Find the list of environment variables for this process.
`static boolean` `isFailure(int exitValue)` Checks whether `exitValue` signals a failure on the current system (OS specific).
`boolean` `killedProcess()` test for an untimely death of the process
`static java.lang.Process` `launch(Project project, java.lang.String[] command, java.lang.String[] env, java.io.File dir, boolean useVM)` Creates a process that runs a command.
`static void` `runCommand(Task task, java.lang.String[] cmdline)` A utility method that runs an external command.
`void` `setAntRun(Project project)` Set the name of the antRun script using the project's value.
`void` `setCommandline(java.lang.String[] commandline)` Sets the commandline of the subprocess to launch.
`void` `setEnvironment(java.lang.String[] env)` Sets the environment variables for the subprocess to launch.
`protected void` `setExitValue(int value)` set the exit value
`void` `setNewenvironment(boolean newenv)` Set whether to propagate the default environment or not.
`void` `setSpawn(boolean spawn)` set whether or not you want the process to be spawned default is not spawned
`void` `setStreamHandler(ExecuteStreamHandler streamHandler)`
`void` `setVMLauncher(boolean useVMLauncher)` Launch this execution through the VM, where possible, rather than through the OS's shell.
`void` `setWorkingDirectory(java.io.File wd)` Sets the working directory of the process to execute.
`void` `spawn()` Starts a process defined by the command line.
`static java.lang.String` `toString(java.io.ByteArrayOutputStream bos)` ByteArrayOutputStream#toString doesn't seem to work reliably on OS/390, at least not the way we use it in the execution context.
`protected void` `waitFor(java.lang.Process process)` wait for a given process

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

### INVALID

    public static final int INVALID

  Invalid exit code.

  See Also:
    Constant Field Values

Constructor Detail

### Execute

    public Execute()

  Creates a new execute object using `PumpStreamHandler` for stream handling.

### Execute

    public Execute(ExecuteStreamHandler streamHandler)

  Creates a new execute object.

Parameters:
  `streamHandler` - the stream handler used to handle the input and output streams of the subprocess.

### Execute

    public Execute(ExecuteStreamHandler streamHandler,
                   ExecuteWatchdog watchdog)

  Creates a new execute object.

Parameters:
  `streamHandler` - the stream handler used to handle the input and output streams of the subprocess.
  `watchdog` - a watchdog for the subprocess or `null` to to disable a timeout for the subprocess.

Method Detail

### setSpawn

    public void setSpawn(boolean spawn)

  set whether or not you want the process to be spawned default is not spawned

  Parameters:
    `spawn` - if true you do not want ant to wait for the end of the process
  Since:
    ant 1.6

### getProcEnvironment

    public static java.util.Vector getProcEnvironment()

  Find the list of environment variables for this process.

  Returns:
    a vector containing the environment variables the vector elements are strings formatted like variable = value

### toString

    public static java.lang.String toString(java.io.ByteArrayOutputStream bos)

  ByteArrayOutputStream#toString doesn't seem to work reliably on OS/390, at least not the way we use it in the execution context.

  Parameters:
    `bos` - the output stream that one wants to read
  Returns:
    the output stream as a string, read with special encodings in the case of z/os and os/400
  Since:
    Ant 1.5

### setStreamHandler

    public void setStreamHandler(ExecuteStreamHandler streamHandler)

  Since:
    Ant 1.6

### getCommandline

    public java.lang.String[] getCommandline()

  Returns the commandline used to create a subprocess.

  Returns:
    the commandline used to create a subprocess

### setCommandline

    public void setCommandline(java.lang.String[] commandline)

  Sets the commandline of the subprocess to launch.

  Parameters:
    `commandline` - the commandline of the subprocess to launch

### setNewenvironment

    public void setNewenvironment(boolean newenv)

  Set whether to propagate the default environment or not.

  Parameters:
    `newenv` - whether to propagate the process environment.

### getEnvironment

    public java.lang.String[] getEnvironment()

  Returns the environment used to create a subprocess.

  Returns:
    the environment used to create a subprocess

### setEnvironment

    public void setEnvironment(java.lang.String[] env)

  Sets the environment variables for the subprocess to launch.

  Parameters:
    `env` - array of Strings, each element of which has an environment variable settings in format key=value

### setWorkingDirectory

    public void setWorkingDirectory(java.io.File wd)

  Sets the working directory of the process to execute.

  This is emulated using the antRun scripts unless the OS is Windows NT in which case a cmd.exe is spawned, or MRJ and setting user.dir works, or JDK 1.3 and there is official support in java.lang.Runtime.

  Parameters:
    `wd` - the working directory of the process.

### setAntRun

    public void setAntRun(Project project)
                   throws BuildException

  Set the name of the antRun script using the project's value.

  Parameters:
    `project` - the current project.
  Throws:
    `BuildException` - not clear when it is going to throw an exception, but it is the method's signature

### setVMLauncher

    public void setVMLauncher(boolean useVMLauncher)

  Launch this execution through the VM, where possible, rather than through the OS's shell. In some cases and operating systems using the shell will allow the shell to perform additional processing such as associating an executable with a script, etc

  Parameters:
    `useVMLauncher` - true if exec should launch through the VM, false if the shell should be used to launch the command.

### launch

    public static java.lang.Process launch(Project project,
                                           java.lang.String[] command,
                                           java.lang.String[] env,
                                           java.io.File dir,
                                           boolean useVM)
                                    throws java.io.IOException

  Creates a process that runs a command.

  Parameters:
    `project` - the Project, only used for logging purposes, may be null.
    `command` - the command to run
    `env` - the environment for the command
    `dir` - the working directory for the command
    `useVM` - use the built-in exec command for JDK 1.3 if available.
  Returns:
    the process started
  Throws:
    `java.io.IOException` - forwarded from the particular launcher used
  Since:
    Ant 1.5

### execute

    public int execute()
                throws java.io.IOException

  Runs a process defined by the command line and returns its exit status.

  Returns:
    the exit status of the subprocess or `INVALID`
  Throws:
    `java.io.IOException` - The exception is thrown, if launching of the subprocess failed

### spawn

    public void spawn()
               throws java.io.IOException

  Starts a process defined by the command line. Ant will not wait for this process, nor log its output

  Throws:
    `java.io.IOException` - The exception is thrown, if launching of the subprocess failed
  Since:
    ant 1.6

### waitFor

    protected void waitFor(java.lang.Process process)

  wait for a given process

  Parameters:
    `process` - the process one wants to wait for

### setExitValue

    protected void setExitValue(int value)

  set the exit value

  Parameters:
    `value` - exit value of the process

### getExitValue

    public int getExitValue()

  Query the exit value of the process.

  Returns:
    the exit value or Execute.INVALID if no exit value has been received

### isFailure

    public static boolean isFailure(int exitValue)

  Checks whether `exitValue` signals a failure on the current system (OS specific).

  Note that this method relies on the conventions of the OS, it will return false results if the application you are running doesn't follow these conventions. One notable exception is the Java VM provided by HP for OpenVMS - it will return 0 if successful (like on any other platform), but this signals a failure on OpenVMS. So if you execute a new Java VM on OpenVMS, you cannot trust this method.

  Parameters:
    `exitValue` - the exit value (return code) to be checked
  Returns:
    `true` if `exitValue` signals a failure

### killedProcess

    public boolean killedProcess()

  test for an untimely death of the process

  Returns:
    true if a watchdog had to kill the process
  Since:
    Ant 1.5

### runCommand

    public static void runCommand(Task task,
                                  java.lang.String[] cmdline)
                           throws BuildException

  A utility method that runs an external command. Writes the output and error streams of the command to the project log.

  Parameters:
    `task` - The task that the command is part of. Used for logging
    `cmdline` - The command to execute.
  Throws:
    `BuildException` - if the command does not return 0.

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