After closer examination, this solution is not good enough. Examine the
stacktrace below;
SEVERE: [1284616090213000] javax.servlet.ServletContext log: Exception while
dispatching incoming RPC call
com.google.gwt.user.server.rpc.UnexpectedException: Service method 'public
abstract void
com.netgazelle.client.service.AccountService.createAccount(java.lang.String,java.lang.String,java.lang.String,java.lang.String,java.util.Date,java.lang.String,java.lang.String,java.lang.String,java.lang.String)
throws com.netgazelle.shared.CreateException' threw an unexpected exception:
com.netgazelle.shared.DuplicatePhoneCreationException
at com.google.gwt.user.server.rpc.RPC.encodeResponseForFailure(RPC.java:378)
at com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:581)
at com.google.gwt.user.server.rpc.RemoteServiceServlet.processCall(
RemoteServiceServlet.java:188)
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: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$CachedChain.doFilter(
ServletHandler.java:1166)
at com.google.appengine.api.blobstore.dev.ServeBlobFilter.doFilter(
ServeBlobFilter.java:58)
at org.mortbay.jetty.servlet.ServletHandler$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)
Caused by: com.netgazelle.shared.DuplicatePhoneCreationException
at com.netgazelle.server.manager.AccountManager.createAccount(
AccountManager.java:285)
at com.netgazelle.server.service.AccountServiceImpl.createAccount(
AccountServiceImpl.java:74)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(
NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(
DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at com.google.appengine.tools.development.agent.runtime.Runtime.invoke(
Runtime.java:100)
at com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:562)
... 30 more
My problem lies in RPC.java line
377; !RPCServletUtils.isExpectedException(serviceMethod, cause))
The function RPCServletUtils.isExpectedException does not take this into
consideration;
--> if the cause is an unchecked exception
--> if the cuase is an subclass instance of an defined and checked exception
The workaround seems to be to define the explicit exceptions throws in the
service interface.
Does anyone have a reason for why I should not report this a bug in the
issue tracker ?
Thanks,
:-) Kasper
On Tue, Sep 14, 2010 at 8:50 AM, San0 <san...@gmail.com> wrote:
> Your service probably extends RemoteServiceServlet, which is catching
> all non declared exceptions. Simple solution is to create your own
> RemoteServiceServlet implementation with overridden:
> String processCall(String payload) throws SerializationException
> Something like this:
>
> try {
> RPCRequest rpcRequest = RPC.decodeRequest(payload,
> delegate.getClass(), this);
> onAfterRequestDeserialized(rpcRequest);
> return RPC.invokeAndEncodeResponse(delegate,
> rpcRequest.getMethod(),
> rpcRequest.getParameters(),
> rpcRequest.getSerializationPolicy(),
> rpcRequest.getFlags());
> } catch (IncompatibleRemoteServiceException ex) {
> log("An IncompatibleRemoteServiceException was thrown while
> processing this call.",ex);
> return RPC.encodeResponseForFailure(null, ex);
> } catch (Exception ex) {
> // RuntimeException
> return RPC.encodeResponseForFailure(null, new
> GwtClientException(ex.getCause().getMessage()));
> }
>
> try-catch is from GWT sources, 2nd catch is what u need to re-throw
> exceptions to client.
>
> On Sep 13, 9:24 pm, Kasper Hansen <kbhdk1...@gmail.com> wrote:
>> Hi,
>>
>> I have this;
>>
>> public abstract class CreateException extends RuntimeException implements
>> Serializable {
>>
>> }
>>
>> Notice that I extend from RuntimeException, making it an unchecked
>> exception.
>>
>> Then I have these two;
>>
>> public class DuplicateEmailCreationException extends CreateException {
>>
>> }
>>
>> public class DuplicatePhoneCreationException extends CreateException {
>>
>> }
>>
>> My service is this one;
>>
>> @RemoteServiceRelativePath("AccountService")
>> public interface AccountService extends RemoteService {
>>
>> public void createAccount(String phone, String email);
>>
>> }
>>
>> Notice I don't declare my CreateException using the "throws" keyword.
>>
>> Now I would expect my view to work. It's this one;
>>
>> ...
>> accountServiceAsync.createAccount(tbPhone.getValue(), tbEmail.getValue(),
>> new AsyncCallback<Void>() {
>>
>> public void onSuccess(Void result) {
>>
>> }
>>
>> public void onFailure(Throwable exception) {
>>
>> if ( exception instanceof DuplicatePhoneCreationException) {
>>
>> // handle it
>>
>> }
>>
>> else {
>>
>> if (exception instanceof DuplicateEmailCreationException) {
>>
>> // handle it
>>
>> }
>> }
>> }
>>
>> ...
>>
>> However, it does not work. But if I add the "throws CreateException" in
the
>> AccountService's createAccount method, it works fine.
>>
>> The whole point with unchecked exceptions, is that I don't have to define
>> them everywhere. Is this not supported ? Or what am I doing wrong here ?
>>
>> Thanks,
>>
>> :-) Kasper
>
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