Is it possible to call Ant or NSIS scripts from Java code?

You can call ant scripts from Java code.

See this article (scroll down to the “Running Ant via Java” section) and this article:

   File buildFile = new File("build.xml");
   Project p = new Project();
   p.setUserProperty("ant.file", buildFile.getAbsolutePath());
   p.init();
   ProjectHelper helper = ProjectHelper.getProjectHelper();
   p.addReference("ant.projectHelper", helper);
   helper.parse(p, buildFile);
   p.executeTarget(p.getDefaultTarget());

Update

I tried with the following ant file , it did not “tell” anything (no console output), but it worked: the file was indeed moved

   <project name="testproject" default="test" basedir=".">
      <target name="test">
        <move file="test.txt" tofile="test2.txt" />
      </target>
   </project>

And when I try it again (when there is no test.txt to move(it is already moved)), I got an java.io.FileNotFoundException.

I think this is what you would expect when you run something from Java.

If you want the console output of the ant tasks, you might want to add a Logger as a build listener.

From @Perception’s answer below.

   DefaultLogger consoleLogger = new DefaultLogger();
   consoleLogger.setErrorPrintStream(System.err);
   consoleLogger.setOutputPrintStream(System.out);
   consoleLogger.setMessageOutputLevel(Project.MSG_INFO);
   p.addBuildListener(consoleLogger);