GWT

NEW bitcoinbankbook.com is an example of GWT on rupy.

Decode, invoke and encode

This is using GWT 2.1.1 or later.

This example uses 'book' as project/jar name, replace this to suit your project/jar.

Add this inner class below to GreetingServiceImpl.java in the generated GWT start app:

public static class Call extends Service {
    public String path() { return "/book/greet"; }
    public void filter(Event event) throws Event, Exception {
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        Deploy.pipe(event.input(), out);
        String req = out.toString();

        /*

         * on host.rupy.se this is done for you
         * so you should remove this line since
         * you don't have the privileges to alter
         * context class loader there.
         */
        Thread.currentThread().setContextClassLoader(event.daemon().archive("book"));

        RPCRequest rpc = RPC.decodeRequest(req, GreetingService.class);

        String res = null;

        try {
            Object response = rpc.getMethod().invoke(new GreetingServiceImpl(), rpc.getParameters());
            res = RPC.encodeResponseForSuccess(rpc.getMethod(), response);
        }
        catch(InvocationTargetException e) {
            res = RPC.encodeResponseForFailure(rpc.getMethod(), e.getCause());
        }

        event.output().print(res);
    }
}

Remove these servlet specific lines:

String serverInfo = getServletContext().getServerInfo();
String userAgent = getThreadLocalRequest().getHeader("User-Agent");

Then add http.jar and gwt-user.jar to the classpath and start rupy:

java -classpath "lib\http.jar;lib\gwt-user.jar" se.rupy.http.Daemon -verbose -pass secret -log

Finally deploy the war file as a jar to rupy with the following build.xml modifications and everything will just magically work:

<path id="project.class.path">
    ...
    <pathelement location="lib/http.jar"/>
</path>

<target name="gwtc" depends="javac" ...>
    ...
    <mkdir dir="bin"/>
    <jar jarfile="bin/book.jar">
        <manifest>
            <attribute name="Built-By" value="${user.name}"/>
        </manifest>
        <fileset dir="war"/>
    </jar>
    <java fork="yes" classname="se.rupy.http.Deploy" classpath="lib/http.jar">
        <arg line="localhost:8000"/>
        <arg line="bin/book.jar"/>
        <arg line="secret"/>
    </java>
</target>

Before 2.1.1 you had to use SerializableException to encode a failure; even though the documentation told you not to.

[Anonymous]

Originally posted by: kbatma... (code.google.com)@gmail.com

Hello

I have created the project mygwt01 (eclipse Google Web Application Project all option default), have changed as is specified above and at the go to http://127.0.0.1:8000/Mygwt01.html Gives out an error "GWT module ' mygwt01 ' may need to be (re) compiled"

Lay out please a working example with GWT.

Thanks.

[Anonymous]

Originally posted by: kbatma... (code.google.com)@gmail.com

At the go to the address http://127.0.0.1:8000/mygwt01/greet

Gives out an error:

java.lang.IllegalArgumentException?: encodedRequest cannot be empty

at com.google.gwt.user.server.rpc.RPC.decodeRequest(RPC.java:232) at com.google.gwt.user.server.rpc.RPC.decodeRequest(RPC.java:170) at com.mygwt01.server.GreetingServiceImpl?$Call.filter(GreetingServiceImpl?.java:66) at se.rupy.http.Chain.filter(Chain.java:80) at se.rupy.http.Event.service(Event.java:281) at se.rupy.http.Event.read(Event.java:222) at se.rupy.http.Worker.run(Worker.java:175) at java.lang.Thread.run(Unknown Source)