Apache Ant Java Task

This task is used to execute Java code inside the Ant JVM. We can also use other (outside) JVM by setting fork attribute true.

To get input for the fork JVM, we can use input and inputstring attributes.

Apache Ant Java Task Attributes

Attribute	Description	Required
classname	A Java class which is to be executed.	Exactly one of the three
jar	Jar file with location.
module	Main module name to resolve.
args	The arguments for the class that is executed.	No
classpath	The classpath to use.	No
classpathref	The classpath to use with path reference.	No
modulepath	It is used to specify module path.	No
modulepathref	The modulepath with path reference.	No
fork	If enabled triggers the class execution in another JVM.	No
spawn	It is used to allow to start a process which will outlive Ant.	No
jvm	It is a command used to run JVM.	No
jvmargs	The JVM arguments, passed to the JVM.	No
maxmemory	Max amount of memory to allocate to the forked JVM.	No
failonerror	It stops the build process.	No
resultproperty	The name of a property in which the return code of the command should be stored.	No
dir	The directory to be include in run.	No
output	Output file name.	No
error	Error file name.	No
logError	To get errors log, store into a file.	No
append	Whether output and error files should be appended to or overwritten./td>	No
outputproperty	A property in which the output of the command should be stored.	No
errorproperty	A property in which the standard error of the command should be stored.	No

Apache Ant Java Task Example

This example will run the a Java class Hello.

<project name="java-ant project" default="run">	
	<target name="run">
		<java classname = "com.javatpoint.Hello">
			<classpath path="test"></classpath>
		</java>
	</target>
</project>

Run the JAR with maximum memory 128 MB.

<java jar="dist/test.jar"
      fork="true"
      failonerror="true"
      maxmemory="128m">
  <arg value="-h"/>
  <classpath>
    <pathelement location="dist/test.jar"/>
    <pathelement path="${java.class.path}"/>
  </classpath>
</java>

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