Runs the annotation processor tool (apt), and then optionally compiles the original code, and any generated source code.
This task runs on Java 1.5 to Java 1.7.
Apt is deprecated in Java 1.6, which can run annotation processors as part of javac, and removed from the distribution in Java 1.8. The task will fire an exception when attempting to run under Java 1.8.
This task inherits from the Javac Task, and thus supports nearly all of the same attributes, and subelements. There is one special case, the fork attribute, which is present but which can only be set to true. That is, apt only works as a forked process.
In addition, it supports the following addition items:
| Attribute | Description | Required | 
| compile | After running the Apt, should the code be compiled.  (see the -nocompileflag on the Apt executable) | No, defaults to false. | 
| factory | The fully qualified classname of the AnnotationProcessFactory to be used
                     to construct annotation processors.  This represents the -factorycommand line flag of the Apt executable. | No | 
| factorypathref | The reference id of the path used to find the classes needed by the
                     AnnotationProcessorFactory (and the location of the factory itself).
                     This represents the -factorypathflag on the Apt executable. | No | 
| preprocessdir | The directory used for preprocessing.  This is the directory where the
                     generated source code will be place.  This represents the -sflag on
                     the Apt executable. | No | 
You can specify the path used to find the classes needed by the AnnotationProcessorFactory
   at runtime, using this element.  It is represents as a generic path like structure.  This
   represents the -factorypath flag on the Apt executable.
Used to represent a generic option to pass to Apt.  This represents the -A flag on the
   Apt executable.  You can specify zero or more <option> elements.
| Attribute | Description | Required | 
| name | The name of the option | Yes. | 
| value | The value to set the option to | Yes. | 
<apt srcdir="${src}"
     destdir="${build}"
     classpath="xyz.jar"
     debug="on"
     compile="true"
     factory="com.mycom.MyAnnotationProcessorFactory"
     factorypathref="my.factorypath.id"
     preprocessdir="${preprocess.dir}">
</apt>
compiles all .java files under the ${src}
directory, and stores
the .class files in the ${build} directory.
The classpath used includes xyz.jar, and compiling with
debug information is on.  It also forces the generated source code to
be compiled.  The generated source code will be placed in
${preprocess.dir} directory, using the class
com.mycom.MyAnnotationProcessorFactory to supply
AnnotationProcessor instances.
The inherited "fork" attribute is set to true by default; please do not change it.
The inherited "compiler" attribute is ignored, as it is forced to use the Apt compiler
Using the Apt compiler with the "compile" option set to "true"
   forces you to use Sun's Apt compiler, which will use the JDK's Javac compiler.
   If you wish to use another compiler, you will first need run the Apt processor
   with the "compile" flag set to "false", and then use a
   <javac> task to compile first your original source code, and then the
   generated source code:
<apt srcdir="${src}"
     destdir="${build}"
     classpath="xyz.jar"
     debug="true"
     compile="false"
     factory="com.mycom.MyAnnotationProcessorFactory"
     factorypathref="my.factorypath.id"
     preprocessdir="${preprocess.dir}">
</apt>
<javac srcdir="${src}"
       destdir="${build}"
       classpath="xyz.jar"
       debug="on"/>
<javac srcdir="${preprocess.dir}"
       destdir="${build}"
       classpath="xyz.jar"
       debug="true"/>