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Open source Reference Implementation of JSR-224: Java API for XML Web Services
There is a newer version: 4.0.3
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package com.sun.tools.ws;

import com.sun.tools.ws.wscompile.WsgenTool;

/**
 * WsGen tool entry point.
 * 
 * @author Vivek Pandey
 * @author Kohsuke Kawaguchi
 */
public class WsGen {
    /**
     * CLI entry point. Use {@link Invoker} to
     * load tools.jar
     */
    public static void main(String[] args) throws Throwable {
        System.exit(Invoker.invoke("com.sun.tools.ws.wscompile.WsgenTool", args));
    }

    /**
     * Entry point for tool integration.
     *
     * 
     * This does the same as {@link #main(String[])} except
     * it doesn't invoke {@link System#exit(int)}. This method
     * also doesn't play with classloaders. It's the caller's
     * responsibility to set up the classloader to load all jars
     * needed to run the tool, including $JAVA_HOME/lib/tools.jar
     *
     * @return
     *      0 if the tool runs successfully.
     */
    public static int doMain(String[] args) throws Throwable {
        return new WsgenTool(System.out).run(args) ? 0 : 1;
    }
}