Dear Team,
I'm working on the project right now that is based on the Google
technologies stack(GWT, Guice, Google App Engine). My team and I
wanted to make the overall project structure in domain-driven design
style, so after the latest changes to GWT(the ones that currently in
trunk version) I've started to implement our custom ServiceLayer in
order to use repositories injected by Guice for the persistence layer.
In that custom ServiceLayer implementation I was hoping to be able to
avoid static finder methods for persistent entities.
Everything goes fine with implementation of ServiceLayer API. BUT I've
got a problem with SimpleRequestProcessor and its
decodeInvocationArguments method.
SimpleRequestProcessor still believes that all Request methods should
be static and it causes a
java.lang.NullPointerException at
com.google.gwt.autobean.server.impl.TypeUtils.getParameterization(TypeUtils.java:
125)
at
com.google.gwt.autobean.server.impl.TypeUtils.getSingleParameterization(TypeUtils.java:
151)
at
com.google.gwt.requestfactory.server.SimpleRequestProcessor.decodeInvocationArguments(SimpleRequestProcessor.java:
357)
at
com.google.gwt.requestfactory.server.SimpleRequestProcessor.processInvocationMessages(SimpleRequestProcessor.java:
422)
at
com.google.gwt.requestfactory.server.SimpleRequestProcessor.process(SimpleRequestProcessor.java:
218)
at
com.google.gwt.requestfactory.server.SimpleRequestProcessor.process(SimpleRequestProcessor.java:
125)
at
com.google.gwt.requestfactory.server.RequestFactoryServlet.doPost(RequestFactoryServlet.java:
142)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:713)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:806)
at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:
511)
at org.mortbay.jetty.servlet.ServletHandler
$CachedChain.doFilter(ServletHandler.java:1166)
at
com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:
67)
at
com.google.inject.servlet.ManagedFilterPipeline.dispatch(ManagedFilterPipeline.java:
122)
at com.google.inject.servlet.GuiceFilter.doFilter(GuiceFilter.java:
110)
at org.mortbay.jetty.servlet.ServletHandler
$CachedChain.doFilter(ServletHandler.java:1157)
at
com.google.appengine.api.blobstore.dev.ServeBlobFilter.doFilter(ServeBlobFilter.java:
58)
at org.mortbay.jetty.servlet.ServletHandler
$CachedChain.doFilter(ServletHandler.java:1157)
at
com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:
43)
at org.mortbay.jetty.servlet.ServletHandler
$CachedChain.doFilter(ServletHandler.java:1157)
at
com.google.appengine.tools.development.StaticFileFilter.doFilter(StaticFileFilter.java:
122)
at org.mortbay.jetty.servlet.ServletHandler
$CachedChain.doFilter(ServletHandler.java:1157)
at
org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:
388)
at
org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:
216)
at
org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:
182)
at
org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:
765)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:
418)
at
com.google.apphosting.utils.jetty.DevAppEngineWebAppContext.handle(DevAppEngineWebAppContext.java:
70)
at
org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:
152)
at com.google.appengine.tools.development.JettyContainerService
$ApiProxyHandler.handle(JettyContainerService.java:349)
at
org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:
152)
at org.mortbay.jetty.Server.handle(Server.java:326)
at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:
542)
at org.mortbay.jetty.HttpConnection
$RequestHandler.content(HttpConnection.java:938)
at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:755)
at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:218)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
at
org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:
409)
at org.mortbay.thread.QueuedThreadPool
$PoolThread.run(QueuedThreadPool.java:582)
The question is what is the right way to implement non-static Request
methods for persistent entities (like findProject(id))?
Maybe you can consider providing some kind of API to switch the
RequestProcessor instance?
Any feedback will be appreciated.
Regards,
Eugene
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