CODEWITHSUNDEEP
javaant
GingerComa
GingerComa

Reputation: 147

Ant: How to execute Ant from Java

I'm trying execute Ant target from Java for searching directories by criteria. If run searchDirectories from console, result is OK, if from Java class, directories not found.

File buildFile = new File("build.xml");

Project p = new Project();
p.setUserProperty("ant.file", buildFile.getAbsolutePath());
p.init();
ProjectHelper helper = ProjectHelper.getProjectHelper();
DefaultLogger consoleLogger = new DefaultLogger();
consoleLogger.setErrorPrintStream(System.err);
consoleLogger.setOutputPrintStream(System.out);
consoleLogger.setMessageOutputLevel(Project.MSG_INFO);
p.addBuildListener(consoleLogger);
p.addReference("ant.projectHelper", helper);
helper.parse(p, buildFile);

try {
    p.fireBuildStarted();
    p.fireSubBuildStarted();
    p.executeTarget("searchDirectories");
} catch (IOException e) {
    p.fireBuildFinished(e);
}

EDIT: If I call Ant from directory where contains build.xml, directories will be found. Otherwise when ant is executed via this line the result is incorrect.

ant -buildfile D:\Projects\antproj searchDirectories

I can't understand what is the problem?

Upvotes: 1

Views: 231

Answers (1)

beatngu13
beatngu13

Reputation: 9373

You can execute Ant from Java and print the output to System.out as follows (note that -buildfile is the same as -file or -f):

ProcessBuilder builder = new ProcessBuilder("ant", "-f", "/path/to/build.xml", "searchDirectories");
Process process = builder.start();

try (BufferedReader out = new BufferedReader(new InputStreamReader(process.getInputStream()))) {
    out.lines().collect(Collectors.toList()).forEach(System.out::println);
}

If your searchDirectories task produces wrong results, maybe the corresponding <target> contains a bug.

Upvotes: 1

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