I have an Java App Engine project using SDK 1.3.5 and the latest
Restlet GAE 2.0rc4 to implement some restful services. Everything
worked well (this has been in production for 6 months) until I added
GWT 2.0.4 to the project. As soon as I check use GWT on in the
control panel in Eclipse (without even adding a module) my services
start to fail in the development server with the following class not
found exception:
Couldn't write the XML representation: Provider
org.apache.xalan.processor.TransformerFactoryImpl not found
This exception happens on the way out of my Restlet, after a GET of a
lists of entities, as it tries to turn my DomRepresentation into the
response payload. I've found that if I remove the gwt-dev.jar, the
exception does not happen. Of course, I can't use the development
server if I do that. Again, this all works fine without GWT.
Here is the relevant parts of the trace:
SEVERE: An exception occured writing the response entity
java.io.IOException: Couldn't write the XML representation: Provider
org.apache.xalan.processor.TransformerFactoryImpl not found
at
org.restlet.ext.xml.DomRepresentation.write(DomRepresentation.java:
287)
at
org.restlet.representation.WriterRepresentation.write(WriterRepresentation.java:
104)
at
org.restlet.engine.http.ServerCall.writeResponseBody(ServerCall.java:
502)
at org.restlet.engine.http.ServerCall.sendResponse(ServerCall.java:
439)
at
org.restlet.ext.servlet.internal.ServletCall.sendResponse(ServletCall.java:
451)
at
org.restlet.engine.http.adapter.ServerAdapter.commit(ServerAdapter.java:
198)
at
org.restlet.engine.http.HttpServerHelper.handle(HttpServerHelper.java:
151)
at
org.restlet.ext.servlet.ServerServlet.service(ServerServlet.java:1037)
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.jav
a:1166)
at
com.google.appengine.api.blobstore.dev.ServeBlobFilter.doFilter(ServeBlobFilter.
java:51)
at
org.mortbay.jetty.servlet.ServletHandler
$CachedChain.doFilter(ServletHandler.jav
a:1157)
at
com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(Transactio
nCleanupFilter.java:43)
at
org.mortbay.jetty.servlet.ServletHandler
$CachedChain.doFilter(ServletHandler.jav
a:1157)
at
com.google.appengine.tools.development.StaticFileFilter.doFilter(StaticFileFilte
r.java:122)
at
org.mortbay.jetty.servlet.ServletHandler
$CachedChain.doFilter(ServletHandler.jav
a: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(DevAppEngineW
ebAppContext.java:70)
at
org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:
152)
at
com.google.appengine.tools.development.JettyContainerService
$ApiProxyHandler.han
dle(JettyContainerService.java:349)
at
org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:
152)
at org.mortbay.jetty.Server.handle(Server.java:326)
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