How to Execute a Java Application in a Separate Process for Cross-Platform Compatibility?

Executing a Java Application in a Separate Process, Simplified

The ability to execute a Java application in a separate process, independent of its location, is a valuable feature for cross-platform compatibility. However, traditional approaches using Runtime.getRuntime().exec(COMMAND) can be platform-specific.

To address this issue, consider the following enhanced solution:

public final class JavaProcess {

    private JavaProcess() {}        

    public static int exec(Class klass, List<String> args) throws IOException,
                                               InterruptedException {

        // Determine platform-independent paths
        String javaHome = System.getProperty("java.home");
        String javaBin = javaHome +
                File.separator + "bin" +
                File.separator + "java";
        String classpath = System.getProperty("java.class.path");
        String className = klass.getName();

        // Create process builder
        ProcessBuilder builder = new ProcessBuilder();

        // Set command and arguments
        builder.command().addAll(Arrays.asList(javaBin, "-cp", classpath, className));
        builder.command().addAll(args);

        // Execute and return exit status
        Process process = builder.inheritIO().start();
        process.waitFor();
        return process.exitValue();
    }
}

Usage:

int status = JavaProcess.exec(MyClass.class, args);

This approach leverages the Java system properties to obtain necessary paths and utilizes a ProcessBuilder for platform-independent process creation. It accepts the fully qualified class name and provides the desired platform-agnostic behavior.

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