Package org.apache.commons.exec.launcher

# Interface CommandLauncher

All Known Implementing Classes:
  `CommandLauncherImpl`, `CommandLauncherProxy`, `Java13CommandLauncher`, `OS2CommandLauncher`, `VmsCommandLauncher`, `WinNTCommandLauncher`

public interface CommandLauncher
Abstracts platform-dependent implementations.

- ## Method Summary

  Modifier and Type
  Method
  Description
  `Process`
  `exec(CommandLine commandLine, Map<String,String> env)`
  Executes the given command in a new process.
  `Process`
  `exec(CommandLine commandLine, Map<String,String> env, File workingDirectory)`
  Executes the given command in a new process, in the given working directory.
  `boolean`
  `isFailure(int exitValue)`
  Tests whether `exitValue` signals a failure on the current system (OS specific).

- ## Method Details

  - ### exec

    Process exec(CommandLine commandLine, Map<String,String> env) throws IOException
    Executes the given command in a new process.
    Parameters:
      `commandLine` - The command to execute.
      `env` - The environment for the new process. If null, the environment of the current process is used.
    Returns:
      the newly created process.
    Throws:
      `IOException` - if attempting to run a command in a specific directory.

  - ### exec

    Process exec(CommandLine commandLine, Map<String,String> env, File workingDirectory) throws IOException
    Executes the given command in a new process, in the given working directory.
    Parameters:
      `commandLine` - The command to execute.
      `env` - The environment for the new process. If null, the environment of the current process is used.
      `workingDirectory` - The directory to start the command in. If null, the current directory is used.
    Returns:
      the newly created process.
    Throws:
      `IOException` - if trying to change directory.

  - ### isFailure

    boolean isFailure(int exitValue)
    Tests 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.