{"id":70,"date":"2012-07-06T19:18:54","date_gmt":"2012-07-06T18:18:54","guid":{"rendered":"http:\/\/mayeur.com\/wordpressfr\/?p=70"},"modified":"2012-07-06T19:59:49","modified_gmt":"2012-07-06T18:59:49","slug":"hijacking-gwt-rpc-serialization","status":"publish","type":"post","link":"https:\/\/mayeur.com\/wordpressfr\/hijacking-gwt-rpc-serialization\/","title":{"rendered":"Hijacking GWT-RPC serialization"},"content":{"rendered":"

GWT<\/a>, the Google Web Toolkit for client-side web programming, contains several client\/server communication frameworks. The \u00ab\u00a0traditional\u00a0\u00bb one is called GWT-RPC. GWT-RPC encapsulates the serialization\/deserialization of objects, and all the protocol plumbing.<\/p>\n

This is usually fine for most use cases, but I needed to explicitely serialize objects on the client side, and deserialize them on the server side.<\/p>\n

Use case<\/span> : I need to call a servlet from my GWT application, to open a document (generated server-side) in a new windows – using window.open()<\/p>\n

Solution<\/span> : create a standard GWT-RPC, declaring a \u00ab\u00a0fake\u00a0\u00bb method containing all the parameter types that we need to explicitly serialize. This will generate a correct GWT \u00ab\u00a0serialization policy\u00a0\u00bb. Then, server side, implement the GWT Service servlet, and override the doGet<\/code> with your code.<\/p>\n

Create the standard GWT-RPC interfaces :<\/p>\n

The interface declares a fake method, with the only goal to allow the type we want to add in the serialization process (here, we have OutputTypeEnum, RepositoryServiceEnum and FBBaseFilterPagingLoadConfig).<\/p>\n

@RemoteServiceRelativePath(\"..\/fastbiz\/service\/recordUpload\")
\npublic interface RecordUploadService extends RemoteService {
\n \/\/ Fake
\n void fakeModel(OutputTypeEnum outputType, RepositoryServiceEnum repository, FBBaseFilterPagingLoadConfig config) throws FBException;
\n}
\n<\/code>
\n 
\npublic interface RecordUploadServiceAsync {
\n \/\/ Fake
\n void fakeModel(OutputTypeEnum outputType,RepositoryServiceEnum repository,FBBaseFilterPagingLoadConfig config, AsyncCallback<Void> callback);
\n}
\n<\/code><\/p>\n