org.apache.tools.ant.taskdefs

## Class Javac

- java.lang.Object
- - org.apache.tools.ant.ProjectComponent
  - - org.apache.tools.ant.Task
    - - org.apache.tools.ant.taskdefs.MatchingTask
      - - org.apache.tools.ant.taskdefs.Javac

- All Implemented Interfaces:
    java.lang.Cloneable, SelectorContainer
  Direct Known Subclasses:
    Apt

      public class Javac
      extends MatchingTask

  Compiles Java source files. This task can take the following arguments:
  - sourcedir
  - destdir
  - deprecation
  - classpath
  - bootclasspath
  - extdirs
  - optimize
  - debug
  - encoding
  - target
  - depend
  - verbose
  - failonerror
  - includeantruntime
  - includejavaruntime
  - source
  - compiler
  Of these arguments, the sourcedir and destdir are required.

  When this task executes, it will recursively scan the sourcedir and destdir looking for Java source files to compile. This task makes its compile decision based on timestamp.

  Since:
    Ant 1.1

- - ### Nested Class Summary

    Nested Classes
    Modifier and Type | Class and Description
    --- | ---
    `class` | `Javac.ImplementationSpecificArgument` Adds an "compiler" attribute to Commandline$Attribute used to filter command line attributes based on the current implementation.

  - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `protected java.io.File[]` | `compileList`
    `protected boolean` | `failOnError`
    `protected boolean` | `listFiles`

    - ### Fields inherited from class org.apache.tools.ant.taskdefs.MatchingTask

      `fileset`

    - ### Fields inherited from class org.apache.tools.ant.Task

      `target, taskName, taskType, wrapper`

    - ### Fields inherited from class org.apache.tools.ant.ProjectComponent

      `description, location, project`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `Javac()` Javac task for compilation of Java files.

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `add(CompilerAdapter adapter)` Set the compiler adapter explicitly.
    `protected void` | `checkParameters()` Check that all required attributes have been set and nothing silly has been entered.
    `protected void` | `compile()` Perform the compilation.
    `Path` | `createBootclasspath()` Adds a path to the bootclasspath.
    `Path` | `createClasspath()` Adds a path to the classpath.
    `Javac.ImplementationSpecificArgument` | `createCompilerArg()` Adds an implementation specific command-line argument.
    `Path` | `createCompilerClasspath()` The classpath to use when loading the compiler implementation if it is not a built-in one.
    `Path` | `createExtdirs()` Adds a path to extdirs.
    `Path` | `createSourcepath()` Adds a path to sourcepath.
    `Path` | `createSrc()` Adds a path for source compilation.
    `void` | `execute()` Executes the task.
    `Path` | `getBootclasspath()` Gets the bootclasspath that will be used to compile the classes against.
    `Path` | `getClasspath()` Gets the classpath to be used for this compilation.
    `java.lang.String` | `getCompiler()` The implementation for this particular task.
    `java.lang.String` | `getCompilerVersion()` The implementation for this particular task.
    `java.lang.String[]` | `getCurrentCompilerArgs()` Get the additional implementation specific command line arguments.
    `boolean` | `getDebug()` Gets the debug flag.
    `java.lang.String` | `getDebugLevel()` Get the value of debugLevel.
    `boolean` | `getDepend()` Gets the depend flag.
    `boolean` | `getDeprecation()` Gets the deprecation flag.
    `java.io.File` | `getDestdir()` Gets the destination directory into which the java source files should be compiled.
    `java.lang.String` | `getEncoding()` Gets the java source file encoding name.
    `java.lang.String` | `getExecutable()` The value of the executable attribute, if any.
    `Path` | `getExtdirs()` Gets the extension directories that will be used during the compilation.
    `boolean` | `getFailonerror()` Gets the failonerror flag.
    `java.io.File[]` | `getFileList()` Gets the list of files to be compiled.
    `boolean` | `getIncludeantruntime()` Gets whether or not the ant classpath is to be included in the classpath.
    `boolean` | `getIncludejavaruntime()` Gets whether or not the java runtime should be included in this task's classpath.
    `java.lang.String` | `getJavacExecutable()` The name of the javac executable to use in fork-mode.
    `boolean` | `getListfiles()` Get the listfiles flag.
    `java.lang.String` | `getMemoryInitialSize()` Gets the memoryInitialSize flag.
    `java.lang.String` | `getMemoryMaximumSize()` Gets the memoryMaximumSize flag.
    `boolean` | `getNowarn()` Should the -nowarn option be used.
    `boolean` | `getOptimize()` Gets the optimize flag.
    `java.lang.String` | `getSource()` Get the value of source.
    `Path` | `getSourcepath()` Gets the sourcepath to be used for this compilation.
    `Path` | `getSrcdir()` Gets the source dirs to find the source java files.
    `protected java.lang.String` | `getSystemJavac()`
    `java.lang.String` | `getTarget()` Gets the target VM that the classes will be compiled for.
    `boolean` | `getTaskSuccess()` Get the result of the javac task (success or failure).
    `java.io.File` | `getTempdir()` Where Ant should place temporary files.
    `boolean` | `getVerbose()` Gets the verbose flag.
    `boolean` | `isForkedJavac()` Is this a forked invocation of JDK's javac?
    `boolean` | `isIncludeDestClasses()` Get the value of the includeDestClasses property.
    `protected boolean` | `isJdkCompiler(java.lang.String compilerImpl)` Is the compiler implementation a jdk compiler
    `protected Path` | `recreateSrc()` Recreate src.
    `protected void` | `resetFileLists()` Clear the list of files to be compiled and copied..
    `protected void` | `scanDir(java.io.File srcDir, java.io.File destDir, java.lang.String[] files)` Scans the directory looking for source files to be compiled.
    `void` | `setBootclasspath(Path bootclasspath)` Sets the bootclasspath that will be used to compile the classes against.
    `void` | `setBootClasspathRef(Reference r)` Adds a reference to a classpath defined elsewhere.
    `void` | `setClasspath(Path classpath)` Set the classpath to be used for this compilation.
    `void` | `setClasspathRef(Reference r)` Adds a reference to a classpath defined elsewhere.
    `void` | `setCompiler(java.lang.String compiler)` Choose the implementation for this particular task.
    `void` | `setCreateMissingPackageInfoClass(boolean b)` Whether package-info.class files will be created by Ant matching package-info.java files that have been compiled but didn't create class files themselves.
    `void` | `setDebug(boolean debug)` Indicates whether source should be compiled with debug information; defaults to off.
    `void` | `setDebugLevel(java.lang.String v)` Keyword list to be appended to the -g command-line switch.
    `void` | `setDepend(boolean depend)` Enables dependency-tracking for compilers that support this (jikes and classic).
    `void` | `setDeprecation(boolean deprecation)` Indicates whether source should be compiled with deprecation information; defaults to off.
    `void` | `setDestdir(java.io.File destDir)` Set the destination directory into which the Java source files should be compiled.
    `void` | `setEncoding(java.lang.String encoding)` Set the Java source file encoding name.
    `void` | `setErrorProperty(java.lang.String errorProperty)` The property to set on compilation failure.
    `void` | `setExecutable(java.lang.String forkExec)` Sets the name of the javac executable.
    `void` | `setExtdirs(Path extdirs)` Sets the extension directories that will be used during the compilation.
    `void` | `setFailonerror(boolean fail)` Indicates whether the build will continue even if there are compilation errors; defaults to true.
    `void` | `setFork(boolean f)` If true, forks the javac compiler.
    `void` | `setIncludeantruntime(boolean include)` If true, includes Ant's own classpath in the classpath.
    `void` | `setIncludeDestClasses(boolean includeDestClasses)` This property controls whether to include the destination classes directory in the classpath given to the compiler.
    `void` | `setIncludejavaruntime(boolean include)` If true, includes the Java runtime libraries in the classpath.
    `void` | `setListfiles(boolean list)` If true, list the source files being handed off to the compiler.
    `void` | `setMemoryInitialSize(java.lang.String memoryInitialSize)` The initial size of the memory for the underlying VM if javac is run externally; ignored otherwise.
    `void` | `setMemoryMaximumSize(java.lang.String memoryMaximumSize)` The maximum size of the memory for the underlying VM if javac is run externally; ignored otherwise.
    `void` | `setNowarn(boolean flag)` If true, enables the -nowarn option.
    `void` | `setOptimize(boolean optimize)` If true, compiles with optimization enabled.
    `void` | `setProceed(boolean proceed)`
    `void` | `setSource(java.lang.String v)` Value of the -source command-line switch; will be ignored by all implementations except modern, jikes and gcj (gcj uses -fsource).
    `void` | `setSourcepath(Path sourcepath)` Set the sourcepath to be used for this compilation.
    `void` | `setSourcepathRef(Reference r)` Adds a reference to a source path defined elsewhere.
    `void` | `setSrcdir(Path srcDir)` Set the source directories to find the source Java files.
    `void` | `setTarget(java.lang.String target)` Sets the target VM that the classes will be compiled for.
    `void` | `setTempdir(java.io.File tmpDir)` Where Ant should place temporary files.
    `void` | `setUpdatedProperty(java.lang.String updatedProperty)` The property to set on compilation success.
    `void` | `setVerbose(boolean verbose)` If true, asks the compiler for verbose output.

    - ### Methods inherited from class org.apache.tools.ant.taskdefs.MatchingTask

      `add, addAnd, addContains, addContainsRegexp, addCustom, addDate, addDepend, addDepth, addDifferent, addFilename, addMajority, addModified, addNone, addNot, addOr, addPresent, addSelector, addSize, addType, appendSelector, createExclude, createExcludesFile, createInclude, createIncludesFile, createPatternSet, getDirectoryScanner, getImplicitFileSet, getSelectors, hasSelectors, selectorCount, selectorElements, setCaseSensitive, setDefaultexcludes, setExcludes, setExcludesfile, setFollowSymlinks, setIncludes, setIncludesfile, setProject, XsetIgnore, XsetItems`

    - ### Methods inherited from class org.apache.tools.ant.Task

      `bindToOwner, getOwningTarget, getRuntimeConfigurableWrapper, getTaskName, getTaskType, getWrapper, handleErrorFlush, handleErrorOutput, handleFlush, handleInput, handleOutput, init, isInvalid, log, log, log, log, maybeConfigure, perform, reconfigure, setOwningTarget, setRuntimeConfigurableWrapper, setTaskName, setTaskType`

    - ### Methods inherited from class org.apache.tools.ant.ProjectComponent

      `clone, getDescription, getLocation, getProject, setDescription, setLocation`

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

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

- - ### Field Detail

    - #### failOnError

          protected boolean failOnError

    - #### listFiles

          protected boolean listFiles

    - #### compileList

          protected java.io.File[] compileList

  - ### Constructor Detail

    - #### Javac

          public Javac()

      Javac task for compilation of Java files.

  - ### Method Detail

    - #### getDebugLevel

          public java.lang.String getDebugLevel()

      Get the value of debugLevel.
      Returns:
        value of debugLevel.

    - #### setDebugLevel

          public void setDebugLevel(java.lang.String v)

      Keyword list to be appended to the -g command-line switch. This will be ignored by all implementations except modern and classic(ver >= 1.2). Legal values are none or a comma-separated list of the following keywords: lines, vars, and source. If debuglevel is not specified, by default, :none will be appended to -g. If debug is not turned on, this attribute will be ignored.
      Parameters:
        `v` - Value to assign to debugLevel.

    - #### getSource

          public java.lang.String getSource()

      Get the value of source.
      Returns:
        value of source.

    - #### setSource

          public void setSource(java.lang.String v)

      Value of the -source command-line switch; will be ignored by all implementations except modern, jikes and gcj (gcj uses -fsource).

      If you use this attribute together with jikes or gcj, you must make sure that your version of jikes supports the -source switch.

      Legal values are 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, and 5, 6, 7, 8 and 9 - by default, no -source argument will be used at all.

      Parameters:
        `v` - Value to assign to source.

    - #### createSrc

          public Path createSrc()

      Adds a path for source compilation.
      Returns:
        a nested src element.

    - #### recreateSrc

          protected Path recreateSrc()

      Recreate src.
      Returns:
        a nested src element.

    - #### setSrcdir

          public void setSrcdir(Path srcDir)

      Set the source directories to find the source Java files.
      Parameters:
        `srcDir` - the source directories as a path

    - #### getSrcdir

          public Path getSrcdir()

      Gets the source dirs to find the source java files.
      Returns:
        the source directories as a path

    - #### setDestdir

          public void setDestdir(java.io.File destDir)

      Set the destination directory into which the Java source files should be compiled.
      Parameters:
        `destDir` - the destination director

    - #### getDestdir

          public java.io.File getDestdir()

      Gets the destination directory into which the java source files should be compiled.
      Returns:
        the destination directory

    - #### setSourcepath

          public void setSourcepath(Path sourcepath)

      Set the sourcepath to be used for this compilation.
      Parameters:
        `sourcepath` - the source path

    - #### getSourcepath

          public Path getSourcepath()

      Gets the sourcepath to be used for this compilation.
      Returns:
        the source path

    - #### createSourcepath

          public Path createSourcepath()

      Adds a path to sourcepath.
      Returns:
        a sourcepath to be configured

    - #### setSourcepathRef

          public void setSourcepathRef(Reference r)

      Adds a reference to a source path defined elsewhere.
      Parameters:
        `r` - a reference to a source path

    - #### setClasspath

          public void setClasspath(Path classpath)

      Set the classpath to be used for this compilation.
      Parameters:
        `classpath` - an Ant Path object containing the compilation classpath.

    - #### getClasspath

          public Path getClasspath()

      Gets the classpath to be used for this compilation.
      Returns:
        the class path

    - #### createClasspath

          public Path createClasspath()

      Adds a path to the classpath.
      Returns:
        a class path to be configured

    - #### setClasspathRef

          public void setClasspathRef(Reference r)

      Adds a reference to a classpath defined elsewhere.
      Parameters:
        `r` - a reference to a classpath

    - #### setBootclasspath

          public void setBootclasspath(Path bootclasspath)

      Sets the bootclasspath that will be used to compile the classes against.
      Parameters:
        `bootclasspath` - a path to use as a boot class path (may be more than one)

    - #### getBootclasspath

          public Path getBootclasspath()

      Gets the bootclasspath that will be used to compile the classes against.
      Returns:
        the boot path

    - #### createBootclasspath

          public Path createBootclasspath()

      Adds a path to the bootclasspath.
      Returns:
        a path to be configured

    - #### setBootClasspathRef

          public void setBootClasspathRef(Reference r)

      Adds a reference to a classpath defined elsewhere.
      Parameters:
        `r` - a reference to a classpath

    - #### setExtdirs

          public void setExtdirs(Path extdirs)

      Sets the extension directories that will be used during the compilation.
      Parameters:
        `extdirs` - a path

    - #### getExtdirs

          public Path getExtdirs()

      Gets the extension directories that will be used during the compilation.
      Returns:
        the extension directories as a path

    - #### createExtdirs

          public Path createExtdirs()

      Adds a path to extdirs.
      Returns:
        a path to be configured

    - #### setListfiles

          public void setListfiles(boolean list)

      If true, list the source files being handed off to the compiler.
      Parameters:
        `list` - if true list the source files

    - #### getListfiles

          public boolean getListfiles()

      Get the listfiles flag.
      Returns:
        the listfiles flag

    - #### setFailonerror

          public void setFailonerror(boolean fail)

      Indicates whether the build will continue even if there are compilation errors; defaults to true.
      Parameters:
        `fail` - if true halt the build on failure

    - #### setProceed

          public void setProceed(boolean proceed)

      Parameters:
        `proceed` - inverse of failoferror

    - #### getFailonerror

          public boolean getFailonerror()

      Gets the failonerror flag.
      Returns:
        the failonerror flag

    - #### setDeprecation

          public void setDeprecation(boolean deprecation)

      Indicates whether source should be compiled with deprecation information; defaults to off.
      Parameters:
        `deprecation` - if true turn on deprecation information

    - #### getDeprecation

          public boolean getDeprecation()

      Gets the deprecation flag.
      Returns:
        the deprecation flag

    - #### setMemoryInitialSize

          public void setMemoryInitialSize(java.lang.String memoryInitialSize)

      The initial size of the memory for the underlying VM if javac is run externally; ignored otherwise. Defaults to the standard VM memory setting. (Examples: 83886080, 81920k, or 80m)
      Parameters:
        `memoryInitialSize` - string to pass to VM

    - #### getMemoryInitialSize

          public java.lang.String getMemoryInitialSize()

      Gets the memoryInitialSize flag.
      Returns:
        the memoryInitialSize flag

    - #### setMemoryMaximumSize

          public void setMemoryMaximumSize(java.lang.String memoryMaximumSize)

      The maximum size of the memory for the underlying VM if javac is run externally; ignored otherwise. Defaults to the standard VM memory setting. (Examples: 83886080, 81920k, or 80m)
      Parameters:
        `memoryMaximumSize` - string to pass to VM

    - #### getMemoryMaximumSize

          public java.lang.String getMemoryMaximumSize()

      Gets the memoryMaximumSize flag.
      Returns:
        the memoryMaximumSize flag

    - #### setEncoding

          public void setEncoding(java.lang.String encoding)

      Set the Java source file encoding name.
      Parameters:
        `encoding` - the source file encoding

    - #### getEncoding

          public java.lang.String getEncoding()

      Gets the java source file encoding name.
      Returns:
        the source file encoding name

    - #### setDebug

          public void setDebug(boolean debug)

      Indicates whether source should be compiled with debug information; defaults to off.
      Parameters:
        `debug` - if true compile with debug information

    - #### getDebug

          public boolean getDebug()

      Gets the debug flag.
      Returns:
        the debug flag

    - #### setOptimize

          public void setOptimize(boolean optimize)

      If true, compiles with optimization enabled.
      Parameters:
        `optimize` - if true compile with optimization enabled

    - #### getOptimize

          public boolean getOptimize()

      Gets the optimize flag.
      Returns:
        the optimize flag

    - #### setDepend

          public void setDepend(boolean depend)

      Enables dependency-tracking for compilers that support this (jikes and classic).
      Parameters:
        `depend` - if true enable dependency-tracking

    - #### getDepend

          public boolean getDepend()

      Gets the depend flag.
      Returns:
        the depend flag

    - #### setVerbose

          public void setVerbose(boolean verbose)

      If true, asks the compiler for verbose output.
      Parameters:
        `verbose` - if true, asks the compiler for verbose output

    - #### getVerbose

          public boolean getVerbose()

      Gets the verbose flag.
      Returns:
        the verbose flag

    - #### setTarget

          public void setTarget(java.lang.String target)

      Sets the target VM that the classes will be compiled for. Valid values depend on the compiler, for jdk 1.4 the valid values are "1.1", "1.2", "1.3", "1.4", "1.5", "1.6", "1.7", "1.8", "1.9", "5", "6", "7", "8", "9".
      Parameters:
        `target` - the target VM

    - #### getTarget

          public java.lang.String getTarget()

      Gets the target VM that the classes will be compiled for.
      Returns:
        the target VM

    - #### setIncludeantruntime

          public void setIncludeantruntime(boolean include)

      If true, includes Ant's own classpath in the classpath.
      Parameters:
        `include` - if true, includes Ant's own classpath in the classpath

    - #### getIncludeantruntime

          public boolean getIncludeantruntime()

      Gets whether or not the ant classpath is to be included in the classpath.
      Returns:
        whether or not the ant classpath is to be included in the classpath

    - #### setIncludejavaruntime

          public void setIncludejavaruntime(boolean include)

      If true, includes the Java runtime libraries in the classpath.
      Parameters:
        `include` - if true, includes the Java runtime libraries in the classpath

    - #### getIncludejavaruntime

          public boolean getIncludejavaruntime()

      Gets whether or not the java runtime should be included in this task's classpath.
      Returns:
        the includejavaruntime attribute

    - #### setFork

          public void setFork(boolean f)

      If true, forks the javac compiler.
      Parameters:
        `f` - "true|false|on|off|yes|no"

    - #### setExecutable

          public void setExecutable(java.lang.String forkExec)

      Sets the name of the javac executable.

      Ignored unless fork is true or extJavac has been specified as the compiler.

      Parameters:
        `forkExec` - the name of the executable

    - #### getExecutable

          public java.lang.String getExecutable()

      The value of the executable attribute, if any.
      Returns:
        the name of the java executable
      Since:
        Ant 1.6

    - #### isForkedJavac

          public boolean isForkedJavac()

      Is this a forked invocation of JDK's javac?
      Returns:
        true if this is a forked invocation

    - #### getJavacExecutable

          public java.lang.String getJavacExecutable()

      The name of the javac executable to use in fork-mode.

      This is either the name specified with the executable attribute or the full path of the javac compiler of the VM Ant is currently running in - guessed by Ant.

      You should not invoke this method if you want to get the value of the executable command - use `getExecutable` for this.

      Returns:
        the name of the javac executable

    - #### setNowarn

          public void setNowarn(boolean flag)

      If true, enables the -nowarn option.
      Parameters:
        `flag` - if true, enable the -nowarn option

    - #### getNowarn

          public boolean getNowarn()

      Should the -nowarn option be used.
      Returns:
        true if the -nowarn option should be used

    - #### createCompilerArg

          public Javac.ImplementationSpecificArgument createCompilerArg()

      Adds an implementation specific command-line argument.
      Returns:
        a ImplementationSpecificArgument to be configured

    - #### getCurrentCompilerArgs

          public java.lang.String[] getCurrentCompilerArgs()

      Get the additional implementation specific command line arguments.
      Returns:
        array of command line arguments, guaranteed to be non-null.

    - #### setTempdir

          public void setTempdir(java.io.File tmpDir)

      Where Ant should place temporary files.
      Parameters:
        `tmpDir` - the temporary directory
      Since:
        Ant 1.6

    - #### getTempdir

          public java.io.File getTempdir()

      Where Ant should place temporary files.
      Returns:
        the temporary directory
      Since:
        Ant 1.6

    - #### setUpdatedProperty

          public void setUpdatedProperty(java.lang.String updatedProperty)

      The property to set on compilation success. This property will not be set if the compilation fails, or if there are no files to compile.
      Parameters:
        `updatedProperty` - the property name to use.
      Since:
        Ant 1.7.1.

    - #### setErrorProperty

          public void setErrorProperty(java.lang.String errorProperty)

      The property to set on compilation failure. This property will be set if the compilation fails.
      Parameters:
        `errorProperty` - the property name to use.
      Since:
        Ant 1.7.1.

    - #### setIncludeDestClasses

          public void setIncludeDestClasses(boolean includeDestClasses)

      This property controls whether to include the destination classes directory in the classpath given to the compiler. The default value is "true".
      Parameters:
        `includeDestClasses` - the value to use.

    - #### isIncludeDestClasses

          public boolean isIncludeDestClasses()

      Get the value of the includeDestClasses property.
      Returns:
        the value.

    - #### getTaskSuccess

          public boolean getTaskSuccess()

      Get the result of the javac task (success or failure).
      Returns:
        true if compilation succeeded, or was not necessary, false if the compilation failed.

    - #### createCompilerClasspath

          public Path createCompilerClasspath()

      The classpath to use when loading the compiler implementation if it is not a built-in one.
      Since:
        Ant 1.8.0

    - #### add

          public void add(CompilerAdapter adapter)

      Set the compiler adapter explicitly.
      Since:
        Ant 1.8.0

    - #### setCreateMissingPackageInfoClass

          public void setCreateMissingPackageInfoClass(boolean b)

      Whether package-info.class files will be created by Ant matching package-info.java files that have been compiled but didn't create class files themselves.
      Since:
        Ant 1.8.3

    - #### execute

          public void execute()
                       throws BuildException

      Executes the task.
      Overrides:
        `execute` in class `Task`
      Throws:
        `BuildException` - if an error occurs

    - #### resetFileLists

          protected void resetFileLists()

      Clear the list of files to be compiled and copied..

    - #### scanDir

          protected void scanDir(java.io.File srcDir,
                     java.io.File destDir,
                     java.lang.String[] files)

      Scans the directory looking for source files to be compiled. The results are returned in the class variable compileList
      Parameters:
        `srcDir` - The source directory
        `destDir` - The destination directory
        `files` - An array of filenames

    - #### getFileList

          public java.io.File[] getFileList()

      Gets the list of files to be compiled.
      Returns:
        the list of files as an array

    - #### isJdkCompiler

          protected boolean isJdkCompiler(java.lang.String compilerImpl)

      Is the compiler implementation a jdk compiler
      Parameters:
        `compilerImpl` - the name of the compiler implementation
      Returns:
        true if compilerImpl is "modern", "classic", "javac1.1", "javac1.2", "javac1.3", "javac1.4", "javac1.5", "javac1.6", "javac1.7", "javac1.8" or "javac1.9".

    - #### getSystemJavac

          protected java.lang.String getSystemJavac()

      Returns:
        the executable name of the java compiler

    - #### setCompiler

          public void setCompiler(java.lang.String compiler)

      Choose the implementation for this particular task.
      Parameters:
        `compiler` - the name of the compiler
      Since:
        Ant 1.5

    - #### getCompiler

          public java.lang.String getCompiler()

      The implementation for this particular task.

      Defaults to the build.compiler property but can be overridden via the compiler and fork attributes.

      If fork has been set to true, the result will be extJavac and not classic or java1.2 - no matter what the compiler attribute looks like.

      Returns:
        the compiler.
      Since:
        Ant 1.5
      See Also:
        `getCompilerVersion()`

    - #### getCompilerVersion

          public java.lang.String getCompilerVersion()

      The implementation for this particular task.

      Defaults to the build.compiler property but can be overridden via the compiler attribute.

      This method does not take the fork attribute into account.

      Returns:
        the compiler.
      Since:
        Ant 1.5
      See Also:
        `getCompiler()`

    - #### checkParameters

          protected void checkParameters()
                                  throws BuildException

      Check that all required attributes have been set and nothing silly has been entered.
      Throws:
        `BuildException` - if an error occurs
      Since:
        Ant 1.5

    - #### compile

          protected void compile()

      Perform the compilation.
      Since:
        Ant 1.5