ClassNotFound when passing serialized objects via Event Bus

[Pavel Ivashkov]

Hello,

I'm facing a ClassNotFoundException when trying to deserialize object coming from event bus.

Here is a sample verticle code:

package proto;

import java.io.Serializable;

import org.apache.commons.lang3.SerializationUtils;

import org.apache.log4j.Logger;

import org.vertx.java.core.Handler;

import org.vertx.java.core.buffer.Buffer;

import org.vertx.java.core.eventbus.Message;

import org.vertx.java.platform.Verticle;

public class MasterVerticle extends Verticle

{

    private static final Logger logger = Logger.getLogger(MasterVerticle.class);

    public static class MyTestClass implements Serializable

    {

        String field;

    }

    @Override

    public void start()

    {

        vertx.eventBus().registerHandler("addr", new Handler<Message<Buffer>>()

        {

            @Override

            public void handle(Message<Buffer> msg)

            {

                MyTestClass test = SerializationUtils.deserialize(msg.body().getBytes());

            }

        });

        vertx.setTimer(1000, new Handler<Long>()

        {

            @Override

            public void handle(Long event)

            {

                MyTestClass tes = new MyTestClass();

                tes.field = "test";

                vertx.eventBus().send("addr", new Buffer(SerializationUtils.serialize(tes)));

            }

        });

    }

}

Command line:

bin/vertx run proto.MasterVerticle -cp "../build/libs/clzloader-1.0.jar:../build/deps/*"

The error I'm getting:

Registering handler

Succeeded in deploying verticle

Sending message

class loader class org.vertx.java.platform.impl.ModuleClassLoader

Handling message

Exception in Java verticle

org.apache.commons.lang3.SerializationException: java.lang.ClassNotFoundException: proto.MasterVerticle$MyTestClass

at org.apache.commons.lang3.SerializationUtils.deserialize(SerializationUtils.java:230)

at org.apache.commons.lang3.SerializationUtils.deserialize(SerializationUtils.java:268)

at proto.MasterVerticle$1.handle(MasterVerticle.java:35)

at proto.MasterVerticle$1.handle(MasterVerticle.java:26)

at org.vertx.java.core.eventbus.impl.DefaultEventBus$11.run(DefaultEventBus.java:943)

at org.vertx.java.core.impl.DefaultContext$3.run(DefaultContext.java:175)

at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:370)

at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:353)

at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:116)

at java.lang.Thread.run(Thread.java:745)

Caused by: java.lang.ClassNotFoundException: proto.MasterVerticle$MyTestClass

at java.net.URLClassLoader$1.run(URLClassLoader.java:372)

at java.net.URLClassLoader$1.run(URLClassLoader.java:361)

at java.security.AccessController.doPrivileged(Native Method)

at java.net.URLClassLoader.findClass(URLClassLoader.java:360)

at java.lang.ClassLoader.loadClass(ClassLoader.java:424)

at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)

at java.lang.ClassLoader.loadClass(ClassLoader.java:357)

at java.lang.Class.forName0(Native Method)

at java.lang.Class.forName(Class.java:340)

at java.io.ObjectInputStream.resolveClass(ObjectInputStream.java:626)

at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1613)

at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1518)

at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1774)

at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351)

at java.io.ObjectInputStream.readObject(ObjectInputStream.java:371)

at org.apache.commons.lang3.SerializationUtils.deserialize(SerializationUtils.java:224)

... 9 more

What could be the cause of this?

- pavel

[Paulo Lopes]

you need to add the class file you are trying to deserialize to all your modules, this is not a vert.x issue it is just how java serialization works...

[Pavel Ivashkov]

Paulo, look at the sample -- there is single module with single verticle. I'm passing serialized object through event bus into the same verticle.

- pavel

[Nick Scavelli]

Try making it a module. Running raw verticles is really for very simple scenarios.

[Pavel Ivashkov]

Running this sample as a module fixes the issue. Thank you.