GWT RPC Serialization on web and app server

[Anky]

Hi All,

I am facing a very strange scenario here. We have a GWT application that runs perfectly fine when deployed on weblogic app server. So far this was going pretty smooth for us. Now we are preparing our app for production release. For that, as per our company standard, we have installed a web server on our integration machine which will communicate with app server (installed on the same integration machine). When we access our application via webserver, we are getting the incompatibleremoteservletexception

We are using Serializable objects instead of IsSerializable for all the RPC calls in our application. This works fine when the application is directly access via the application server.

Your help here would be really appreciated.

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sample exception stack trace:

com.google.gwt.user.client.rpc.IncompatibleRemoteServiceException: Type 'com.xyz.rpcservices.ABCRequest' was not assignable to 'com.google.gwt.user.client.rpc.IsSerializable' and did not have a custom field serializer. For security purposes, this type will not be deserialized.

        at com.google.gwt.user.server.rpc.RPC.decodeRequest(RPC.java:308)

        at com.google.gwt.user.server.rpc.RemoteServiceServlet.processCall(RemoteServiceServlet.java:186)

        at com.google.gwt.user.server.rpc.RemoteServiceServlet.processPost(RemoteServiceServlet.java:224)

        at com.google.gwt.user.server.rpc.AbstractRemoteServiceServlet.doPost(AbstractRemoteServiceServlet.java:62)

        at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)

        Truncated. see log file for complete stacktrace

com.google.gwt.user.client.rpc.SerializationException: Type 'com.xyz.rpcservices.ABCRequest' was not assignable to 'com.google.gwt.user.client.rpc.IsSerializable' and did not have a custom field serializer. For security purposes, this type will not be deserialized.

        at com.google.gwt.user.server.rpc.impl.LegacySerializationPolicy.validateDeserialize(LegacySerializationPolicy.java:127)

        at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamReader.deserialize(ServerSerializationStreamReader.java:520)

        at com.google.gwt.user.client.rpc.impl.AbstractSerializationStreamReader.readObject(AbstractSerializationStreamReader.java:61)

        at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamReader$ValueReader$8.readValue(ServerSerializationStreamReader.java:137)

        at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamReader.deserializeValue(ServerSerializationStreamReader.java:384)

        Truncated. see log file for complete stacktrace     

[Jens]

Make sure that your app server can still find the <HASH>.rpc file. Thats your GWT-RPC serialization policy file that the server must know in order to serialize anything that implements Serializable. If it does not find this file it falls back to the old IsSerializable mechanism and if you do not have implemented that interface serialization will fail. 

Normally you should see a warning in the app server log on the first RPC request when GWT's RemoteServiceServlet tries to load the serialization policy file but can not find it.

For example I often have to change the lookup of that file because my deployment does not conform to GWT's standard assumptions.

-- J.

[Benoit GUILLOTIN]

HI Entlog,

How did U fix ur problem on Jmeter with the <HASH>.gwt.rpc file ?
Im still looking for fixing this IncompatibleRemoteServiceException.

Thanks for ur answer.
Benoit

Le jeudi 23 mai 2013 12:30:21 UTC+2, Entlog a écrit :

Awesome!! Thanks. I was having problems with a jmeter test and I saw your solution...it's really that! The jmeter captured request had the reference to the hash for another deployed environment and when trying to test against another deployed war it was throwing the serializable error. Now I know how to fix it :)...

[Snehalkumar Rangnenwar]

Hey Entlog , 

 what was the solution you applied in jmeter to fix the incompatibility issue ? please let us know as well.

Thank in advance, 

skay

[Michael Conrad]

Does your servlet context path exactly match the request path as sent by the browser?

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[Snehalkumar Rangnenwar]

Yes they do match.

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