org.gradle.api.tasks

## Class JavaExec

- java.lang.Object
- - org.gradle.api.internal.AbstractTask
  - - org.gradle.api.DefaultTask
    - - org.gradle.api.internal.ConventionTask
      - - org.gradle.api.tasks.JavaExec

- All Implemented Interfaces:
    Comparable<Task>, org.gradle.api.internal.DynamicObjectAware, org.gradle.api.internal.IConventionAware, org.gradle.api.internal.TaskInternal, ExtensionAware, Task, BaseExecSpec, JavaExecSpec, JavaForkOptions, ProcessForkOptions, org.gradle.util.Configurable<Task>
  Direct Known Subclasses:
    RhinoShellExec

      public class JavaExec
      extends org.gradle.api.internal.ConventionTask
      implements JavaExecSpec

  Executes a Java application in a child process.

  Similar to `Exec`, but starts a JVM with the given classpath and application class.

       apply plugin: 'java'

       task runApp(type: JavaExec) {
         classpath = sourceSets.main.runtimeClasspath

         main = 'package.Main'

         // arguments to pass to the application
         args 'appArg1'
       }

  The process can be started in debug mode (see `getDebug()`) in an ad-hoc manner by supplying the `--debug-jvm` switch when invoking the build.

       gradle someJavaExecTask --debug-jvm

- - ### Nested Class Summary

    - ### Nested classes/interfaces inherited from interface org.gradle.api.Task

      `Task.Namer`

  - ### Field Summary

    - ### Fields inherited from interface org.gradle.api.Task

      `TASK_ACTION, TASK_DEPENDS_ON, TASK_DESCRIPTION, TASK_GROUP, TASK_NAME, TASK_OVERWRITE, TASK_TYPE`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `JavaExec()`

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `JavaExecSpec` | `args(Iterable<?> args)` Adds args for the main class to be executed.
    `JavaExec` | `args(Object... args)` Adds args for the main class to be executed.
    `JavaExec` | `bootstrapClasspath(Object... classpath)` Adds the given values to the end of the bootstrap classpath for the process.
    `JavaExec` | `classpath(Object... paths)` Adds elements to the classpath for executing the main class.
    `JavaExec` | `copyTo(JavaForkOptions options)` Copies these options to the given options.
    `JavaExec` | `copyTo(ProcessForkOptions target)` Copies these options to the given target options.
    `JavaExec` | `environment(Map<String,?> environmentVariables)` Adds some environment variables to the environment for this process.
    `JavaExec` | `environment(String name, Object value)` Adds an environment variable to the environment for this process.
    `void` | `exec()`
    `JavaExec` | `executable(Object executable)` Sets the name of the executable to use.
    `List<String>` | `getAllJvmArgs()` Returns the full set of arguments to use to launch the JVM for the process.
    `List<String>` | `getArgs()` Returns the arguments passed to the main class to be executed.
    `FileCollection` | `getBootstrapClasspath()` Returns the bootstrap classpath to use for the process.
    `FileCollection` | `getClasspath()` Returns the classpath for executing the main class.
    `List<String>` | `getCommandLine()` Returns the full command line, including the executable plus its arguments.
    `boolean` | `getDebug()` Returns true if debugging is enabled for the process.
    `String` | `getDefaultCharacterEncoding()` Returns the default character encoding to use.
    `boolean` | `getEnableAssertions()` Returns true if assertions are enabled for the process.
    `Map<String,Object>` | `getEnvironment()` The environment variables to use for the process.
    `OutputStream` | `getErrorOutput()` Returns the output stream to consume standard error from the process executing the command.
    `String` | `getExecutable()` Returns the name of the executable to use.
    `protected org.gradle.api.internal.file.FileResolver` | `getFileResolver()`
    `List<String>` | `getJvmArgs()` Returns the extra arguments to use to launch the JVM for the process.
    `String` | `getMain()` Returns the fully qualified name of the Main class to be executed.
    `String` | `getMaxHeapSize()` Returns the maximum heap size for the process, if any.
    `String` | `getMinHeapSize()` Returns the minimum heap size for the process, if any.
    `InputStream` | `getStandardInput()` Returns the standard input stream for the process executing the command.
    `OutputStream` | `getStandardOutput()` Returns the output stream to consume standard output from the process executing the command.
    `Map<String,Object>` | `getSystemProperties()` Returns the system properties which will be used for the process.
    `File` | `getWorkingDir()` Returns the working directory for the process.
    `boolean` | `isIgnoreExitValue()` Tells whether a non-zero exit value is ignored, or an exception thrown.
    `JavaExec` | `jvmArgs(Iterable<?> arguments)` Adds some arguments to use to launch the JVM for the process.
    `JavaExec` | `jvmArgs(Object... arguments)` Adds some arguments to use to launch the JVM for the process.
    `void` | `setAllJvmArgs(Iterable<?> arguments)` Sets the full set of arguments to use to launch the JVM for the process.
    `JavaExec` | `setArgs(Iterable<?> applicationArgs)` Sets the args for the main class to be executed.
    `void` | `setBootstrapClasspath(FileCollection classpath)` Sets the bootstrap classpath to use for the process.
    `JavaExec` | `setClasspath(FileCollection classpath)` Sets the classpath for executing the main class.
    `void` | `setDebug(boolean enabled)` Enable or disable debugging for the process.
    `void` | `setDefaultCharacterEncoding(String defaultCharacterEncoding)` Sets the default character encoding to use.
    `void` | `setEnableAssertions(boolean enabled)` Enable or disable assertions for the process.
    `void` | `setEnvironment(Map<String,?> environmentVariables)` Sets the environment variable to use for the process.
    `JavaExec` | `setErrorOutput(OutputStream outputStream)` Sets the output stream to consume standard error from the process executing the command.
    `void` | `setExecutable(Object executable)` Sets the name of the executable to use.
    `JavaExecSpec` | `setIgnoreExitValue(boolean ignoreExitValue)` Sets whether a non-zero exit value is ignored, or an exception thrown.
    `void` | `setJvmArgs(Iterable<?> arguments)` Sets the extra arguments to use to launch the JVM for the process.
    `JavaExec` | `setMain(String mainClassName)` Sets the fully qualified name of the main class to be executed.
    `void` | `setMaxHeapSize(String heapSize)` Sets the maximum heap size for the process.
    `void` | `setMinHeapSize(String heapSize)` Sets the minimum heap size for the process.
    `JavaExec` | `setStandardInput(InputStream inputStream)` Sets the standard input stream for the process executing the command.
    `JavaExec` | `setStandardOutput(OutputStream outputStream)` Sets the output stream to consume standard output from the process executing the command.
    `void` | `setSystemProperties(Map<String,?> properties)` Sets the system properties to use for the process.
    `void` | `setWorkingDir(Object dir)` Sets the working directory for the process.
    `JavaExec` | `systemProperties(Map<String,?> properties)` Adds some system properties to use for the process.
    `JavaExec` | `systemProperty(String name, Object value)` Adds a system property to use for the process.
    `JavaExec` | `workingDir(Object dir)` Sets the working directory for the process.

    - ### Methods inherited from class org.gradle.api.internal.ConventionTask

      `conventionMapping, conventionMapping, getConventionMapping`

    - ### Methods inherited from class org.gradle.api.internal.AbstractTask

      `addValidator, appendParallelSafeAction, compareTo, configure, deleteAllActions, dependsOn, dependsOnTaskDidWork, doFirst, doFirst, doLast, doLast, execute, finalizedBy, getActions, getAnt, getAsDynamicObject, getConvention, getDependsOn, getDescription, getDidWork, getEnabled, getExecuter, getExtensions, getFinalizedBy, getGroup, getImpliesSubProjects, getInputs, getLogger, getLogging, getMustRunAfter, getName, getOnlyIf, getOutputs, getPath, getProject, getServices, getShouldRunAfter, getStandardOutputCapture, getState, getTaskActions, getTaskDependencies, getTemporaryDir, getTemporaryDirFactory, getValidators, hasProperty, injectIntoNewInstance, isEnabled, isHasCustomActions, leftShift, mustRunAfter, onlyIf, onlyIf, prependParallelSafeAction, property, setActions, setDependsOn, setDescription, setDidWork, setEnabled, setExecuter, setFinalizedBy, setGroup, setImpliesSubProjects, setMustRunAfter, setName, setOnlyIf, setOnlyIf, setProject, setProperty, setShouldRunAfter, shouldRunAfter, toString`

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait`

- - ### Constructor Detail

    - #### JavaExec

          public JavaExec()

  - ### Method Detail

    - #### getFileResolver

          @Inject
          protected org.gradle.api.internal.file.FileResolver getFileResolver()

    - #### exec

          public void exec()

    - #### getAllJvmArgs

          public List<String> getAllJvmArgs()

      Returns the full set of arguments to use to launch the JVM for the process. This includes arguments to define system properties, the minimum/maximum heap size, and the bootstrap classpath.
      Specified by:
        `getAllJvmArgs` in interface `JavaForkOptions`
      Returns:
        The arguments. Returns an empty list if there are no arguments.

    - #### setAllJvmArgs

          public void setAllJvmArgs(Iterable<?> arguments)

      Sets the full set of arguments to use to launch the JVM for the process. Overwrites any previously set system properties, minimum/maximum heap size, assertions, and bootstrap classpath.
      Specified by:
        `setAllJvmArgs` in interface `JavaForkOptions`
      Parameters:
        `arguments` - The arguments. Must not be null.

    - #### getJvmArgs

          public List<String> getJvmArgs()

      Returns the extra arguments to use to launch the JVM for the process. Does not include system properties and the minimum/maximum heap size.
      Specified by:
        `getJvmArgs` in interface `JavaForkOptions`
      Returns:
        The arguments. Returns an empty list if there are no arguments.

    - #### setJvmArgs

          public void setJvmArgs(Iterable<?> arguments)

      Sets the extra arguments to use to launch the JVM for the process. System properties and minimum/maximum heap size are updated.
      Specified by:
        `setJvmArgs` in interface `JavaForkOptions`
      Parameters:
        `arguments` - The arguments. Must not be null.

    - #### jvmArgs

          public JavaExec jvmArgs(Iterable<?> arguments)

      Adds some arguments to use to launch the JVM for the process.
      Specified by:
        `jvmArgs` in interface `JavaForkOptions`
      Parameters:
        `arguments` - The arguments. Must not be null.
      Returns:
        this

    - #### jvmArgs

          public JavaExec jvmArgs(Object... arguments)

      Adds some arguments to use to launch the JVM for the process.
      Specified by:
        `jvmArgs` in interface `JavaForkOptions`
      Parameters:
        `arguments` - The arguments.
      Returns:
        this

    - #### getSystemProperties

          public Map<String,Object> getSystemProperties()

      Returns the system properties which will be used for the process.
      Specified by:
        `getSystemProperties` in interface `JavaForkOptions`
      Returns:
        The system properties. Returns an empty map when there are no system properties.

    - #### setSystemProperties

          public void setSystemProperties(Map<String,?> properties)

      Sets the system properties to use for the process.
      Specified by:
        `setSystemProperties` in interface `JavaForkOptions`
      Parameters:
        `properties` - The system properties. Must not be null.

    - #### systemProperties

          public JavaExec systemProperties(Map<String,?> properties)

      Adds some system properties to use for the process.
      Specified by:
        `systemProperties` in interface `JavaForkOptions`
      Parameters:
        `properties` - The system properties. Must not be null.
      Returns:
        this

    - #### systemProperty

          public JavaExec systemProperty(String name,
                                Object value)

      Adds a system property to use for the process.
      Specified by:
        `systemProperty` in interface `JavaForkOptions`
      Parameters:
        `name` - The name of the property
        `value` - The value for the property. May be null.
      Returns:
        this

    - #### getBootstrapClasspath

          @InputFiles
          public FileCollection getBootstrapClasspath()

      Returns the bootstrap classpath to use for the process. The default bootstrap classpath for the JVM is used when this classpath is empty.
      Specified by:
        `getBootstrapClasspath` in interface `JavaForkOptions`
      Returns:
        The bootstrap classpath. Never returns null.

    - #### setBootstrapClasspath

          public void setBootstrapClasspath(FileCollection classpath)

      Sets the bootstrap classpath to use for the process. Set to an empty classpath to use the default bootstrap classpath for the specified JVM.
      Specified by:
        `setBootstrapClasspath` in interface `JavaForkOptions`
      Parameters:
        `classpath` - The classpath. Must not be null. Can be empty.

    - #### bootstrapClasspath

          public JavaExec bootstrapClasspath(Object... classpath)

      Adds the given values to the end of the bootstrap classpath for the process.
      Specified by:
        `bootstrapClasspath` in interface `JavaForkOptions`
      Parameters:
        `classpath` - The classpath.
      Returns:
        this

    - #### getMinHeapSize

          public String getMinHeapSize()

      Returns the minimum heap size for the process, if any.
      Specified by:
        `getMinHeapSize` in interface `JavaForkOptions`
      Returns:
        The minimum heap size. Returns null if the default minimum heap size should be used.

    - #### setMinHeapSize

          public void setMinHeapSize(String heapSize)

      Sets the minimum heap size for the process.
      Specified by:
        `setMinHeapSize` in interface `JavaForkOptions`
      Parameters:
        `heapSize` - The minimum heap size. Use null for the default minimum heap size.

    - #### getDefaultCharacterEncoding

          public String getDefaultCharacterEncoding()

      Returns the default character encoding to use.
      Specified by:
        `getDefaultCharacterEncoding` in interface `JavaForkOptions`
      Returns:
        The default character encoding. Returns null if the `default character encoding of this JVM` should be used.

    - #### setDefaultCharacterEncoding

          public void setDefaultCharacterEncoding(String defaultCharacterEncoding)

      Sets the default character encoding to use. Note: Many JVM implementations support the setting of this attribute via system property on startup (namely, the `file.encoding` property). For JVMs where this is the case, setting the `file.encoding` property via `JavaForkOptions.setSystemProperties(java.util.Map)` or similar will have no effect as this value will be overridden by the value specified by `JavaForkOptions.getDefaultCharacterEncoding()`.
      Specified by:
        `setDefaultCharacterEncoding` in interface `JavaForkOptions`
      Parameters:
        `defaultCharacterEncoding` - The default character encoding. Use null to use `this JVM's default charset`

    - #### getMaxHeapSize

          public String getMaxHeapSize()

      Returns the maximum heap size for the process, if any.
      Specified by:
        `getMaxHeapSize` in interface `JavaForkOptions`
      Returns:
        The maximum heap size. Returns null if the default maximum heap size should be used.

    - #### setMaxHeapSize

          public void setMaxHeapSize(String heapSize)

      Sets the maximum heap size for the process.
      Specified by:
        `setMaxHeapSize` in interface `JavaForkOptions`
      Parameters:
        `heapSize` - The heap size. Use null for the default maximum heap size.

    - #### getEnableAssertions

          public boolean getEnableAssertions()

      Returns true if assertions are enabled for the process.
      Specified by:
        `getEnableAssertions` in interface `JavaForkOptions`
      Returns:
        true if assertions are enabled, false if disabled

    - #### setEnableAssertions

          public void setEnableAssertions(boolean enabled)

      Enable or disable assertions for the process.
      Specified by:
        `setEnableAssertions` in interface `JavaForkOptions`
      Parameters:
        `enabled` - true to enable assertions, false to disable.

    - #### getDebug

          public boolean getDebug()

      Returns true if debugging is enabled for the process. When enabled, the process is started suspended and listening on port 5005.
      Specified by:
        `getDebug` in interface `JavaForkOptions`
      Returns:
        true when debugging is enabled, false to disable.

    - #### setDebug

          public void setDebug(boolean enabled)

      Enable or disable debugging for the process. When enabled, the process is started suspended and listening on port 5005.
      Specified by:
        `setDebug` in interface `JavaForkOptions`
      Parameters:
        `enabled` - true to enable debugging, false to disable.

    - #### getMain

          public String getMain()

      Returns the fully qualified name of the Main class to be executed.
      Specified by:
        `getMain` in interface `JavaExecSpec`

    - #### setMain

          public JavaExec setMain(String mainClassName)

      Sets the fully qualified name of the main class to be executed.
      Specified by:
        `setMain` in interface `JavaExecSpec`
      Parameters:
        `mainClassName` - the fully qualified name of the main class to be executed.
      Returns:
        this

    - #### getArgs

          public List<String> getArgs()

      Returns the arguments passed to the main class to be executed.
      Specified by:
        `getArgs` in interface `JavaExecSpec`

    - #### setArgs

          public JavaExec setArgs(Iterable<?> applicationArgs)

      Sets the args for the main class to be executed.
      Specified by:
        `setArgs` in interface `JavaExecSpec`
      Parameters:
        `applicationArgs` - Args for the main class.
      Returns:
        this

    - #### args

          public JavaExec args(Object... args)

      Adds args for the main class to be executed.
      Specified by:
        `args` in interface `JavaExecSpec`
      Parameters:
        `args` - Args for the main class.
      Returns:
        this

    - #### args

          public JavaExecSpec args(Iterable<?> args)

      Adds args for the main class to be executed.
      Specified by:
        `args` in interface `JavaExecSpec`
      Parameters:
        `args` - Args for the main class.
      Returns:
        this

    - #### setClasspath

          public JavaExec setClasspath(FileCollection classpath)

      Sets the classpath for executing the main class.
      Specified by:
        `setClasspath` in interface `JavaExecSpec`
      Parameters:
        `classpath` - the classpath
      Returns:
        this

    - #### classpath

          public JavaExec classpath(Object... paths)

      Adds elements to the classpath for executing the main class.
      Specified by:
        `classpath` in interface `JavaExecSpec`
      Parameters:
        `paths` - classpath elements
      Returns:
        this

    - #### getClasspath

          @InputFiles
          public FileCollection getClasspath()

      Returns the classpath for executing the main class.
      Specified by:
        `getClasspath` in interface `JavaExecSpec`

    - #### copyTo

          public JavaExec copyTo(JavaForkOptions options)

      Copies these options to the given options.
      Specified by:
        `copyTo` in interface `JavaForkOptions`
      Parameters:
        `options` - The target options.
      Returns:
        this

    - #### getExecutable

          public String getExecutable()

      Returns the name of the executable to use.
      Specified by:
        `getExecutable` in interface `ProcessForkOptions`
      Returns:
        The executable.

    - #### setExecutable

          public void setExecutable(Object executable)

      Sets the name of the executable to use.
      Specified by:
        `setExecutable` in interface `ProcessForkOptions`
      Parameters:
        `executable` - The executable. Must not be null.

    - #### executable

          public JavaExec executable(Object executable)

      Sets the name of the executable to use.
      Specified by:
        `executable` in interface `ProcessForkOptions`
      Parameters:
        `executable` - The executable. Must not be null.
      Returns:
        this

    - #### getWorkingDir

          public File getWorkingDir()

      Returns the working directory for the process. Defaults to the project directory.
      Specified by:
        `getWorkingDir` in interface `ProcessForkOptions`
      Returns:
        The working directory. Never returns null.

    - #### setWorkingDir

          public void setWorkingDir(Object dir)

      Sets the working directory for the process. The supplied argument is evaluated as per `Project.file(Object)`.
      Specified by:
        `setWorkingDir` in interface `ProcessForkOptions`
      Parameters:
        `dir` - The working directory. Must not be null.

    - #### workingDir

          public JavaExec workingDir(Object dir)

      Sets the working directory for the process. The supplied argument is evaluated as per `Project.file(Object)`.
      Specified by:
        `workingDir` in interface `ProcessForkOptions`
      Parameters:
        `dir` - The working directory. Must not be null.
      Returns:
        this

    - #### getEnvironment

          public Map<String,Object> getEnvironment()

      The environment variables to use for the process. Defaults to the environment of this process.
      Specified by:
        `getEnvironment` in interface `ProcessForkOptions`
      Returns:
        The environment. Returns an empty map when there are no environment variables.

    - #### setEnvironment

          public void setEnvironment(Map<String,?> environmentVariables)

      Sets the environment variable to use for the process.
      Specified by:
        `setEnvironment` in interface `ProcessForkOptions`
      Parameters:
        `environmentVariables` - The environment variables. Must not be null.

    - #### environment

          public JavaExec environment(String name,
                             Object value)

      Adds an environment variable to the environment for this process.
      Specified by:
        `environment` in interface `ProcessForkOptions`
      Parameters:
        `name` - The name of the variable.
        `value` - The value for the variable. Must not be null.
      Returns:
        this

    - #### environment

          public JavaExec environment(Map<String,?> environmentVariables)

      Adds some environment variables to the environment for this process.
      Specified by:
        `environment` in interface `ProcessForkOptions`
      Parameters:
        `environmentVariables` - The environment variables. Must not be null.
      Returns:
        this

    - #### copyTo

          public JavaExec copyTo(ProcessForkOptions target)

      Copies these options to the given target options.
      Specified by:
        `copyTo` in interface `ProcessForkOptions`
      Parameters:
        `target` - The target options
      Returns:
        this

    - #### setStandardInput

          public JavaExec setStandardInput(InputStream inputStream)

      Sets the standard input stream for the process executing the command. The stream is closed after the process completes.
      Specified by:
        `setStandardInput` in interface `BaseExecSpec`
      Parameters:
        `inputStream` - The standard input stream for the process. Must not be null.
      Returns:
        this

    - #### getStandardInput

          public InputStream getStandardInput()

      Returns the standard input stream for the process executing the command. The stream is closed after the process completes. Defaults to an empty stream.
      Specified by:
        `getStandardInput` in interface `BaseExecSpec`
      Returns:
        The standard input stream.

    - #### setStandardOutput

          public JavaExec setStandardOutput(OutputStream outputStream)

      Sets the output stream to consume standard output from the process executing the command. The stream is closed after the process completes.
      Specified by:
        `setStandardOutput` in interface `BaseExecSpec`
      Parameters:
        `outputStream` - The standard output stream for the process. Must not be null.
      Returns:
        this

    - #### getStandardOutput

          public OutputStream getStandardOutput()

      Returns the output stream to consume standard output from the process executing the command. Defaults to `System.out`.
      Specified by:
        `getStandardOutput` in interface `BaseExecSpec`
      Returns:
        The output stream

    - #### setErrorOutput

          public JavaExec setErrorOutput(OutputStream outputStream)

      Sets the output stream to consume standard error from the process executing the command. The stream is closed after the process completes.
      Specified by:
        `setErrorOutput` in interface `BaseExecSpec`
      Parameters:
        `outputStream` - The standard output error stream for the process. Must not be null.
      Returns:
        this

    - #### getErrorOutput

          public OutputStream getErrorOutput()

      Returns the output stream to consume standard error from the process executing the command. Default to `System.err`.
      Specified by:
        `getErrorOutput` in interface `BaseExecSpec`
      Returns:
        The error output stream.

    - #### setIgnoreExitValue

          public JavaExecSpec setIgnoreExitValue(boolean ignoreExitValue)

      Sets whether a non-zero exit value is ignored, or an exception thrown.
      Specified by:
        `setIgnoreExitValue` in interface `BaseExecSpec`
      Parameters:
        `ignoreExitValue` - whether a non-zero exit value is ignored, or an exception thrown
      Returns:
        this

    - #### isIgnoreExitValue

          public boolean isIgnoreExitValue()

      Tells whether a non-zero exit value is ignored, or an exception thrown. Defaults to `false`.
      Specified by:
        `isIgnoreExitValue` in interface `BaseExecSpec`
      Returns:
        whether a non-zero exit value is ignored, or an exception thrown

    - #### getCommandLine

          public List<String> getCommandLine()

      Returns the full command line, including the executable plus its arguments.
      Specified by:
        `getCommandLine` in interface `BaseExecSpec`
      Returns:
        The full command line, including the executable plus its arguments