[ http://issues.apache.org/jira/browse/TAPESTRY-328?page=all ]
Howard M. Lewis Ship closed TAPESTRY-328:
-----------------------------------------
Fix Version: 4.0
Resolution: Fixed
Assign To: Howard M. Lewis Ship
> When an engine implementation is missing Tapestry does not throw an
> appropriate error
> -------------------------------------------------------------------------------------
>
> Key: TAPESTRY-328
> URL: http://issues.apache.org/jira/browse/TAPESTRY-328
> Project: Tapestry
> Type: Bug
> Components: Framework
> Versions: 4.0
> Environment: OS X 10.3.9, Tomcat 5.0.30, Powerbook g4
> Reporter: Warner Onstine
> Assignee: Howard M. Lewis Ship
> Fix For: 4.0
>
> I had a custom engine implementation specified in my application file which
> did not exist. When I attempted to access the application I received the
> following error:
> java.lang.NullPointerException
>
> org.apache.tapestry.services.impl.EngineFactoryImpl.constructNewEngineInstance(EngineFactoryImpl.java:90)
>
> $EngineFactory_103d20624a2.constructNewEngineInstance($EngineFactory_103d20624a2.java)
>
> $EngineFactory_103d20624a1.constructNewEngineInstance($EngineFactory_103d20624a1.java)
>
> org.apache.tapestry.services.impl.EngineManagerImpl.getEngineInstance(EngineManagerImpl.java:51)
>
> $EngineManager_103d206249b.getEngineInstance($EngineManager_103d206249b.java)
>
> $EngineManager_103d206249a.getEngineInstance($EngineManager_103d206249a.java)
>
> org.apache.tapestry.services.impl.InvokeEngineTerminator.service(InvokeEngineTerminator.java:51)
>
> org.apache.tapestry.services.impl.WebRequestServicerPipelineBridge.service(WebRequestServicerPipelineBridge.java:56)
>
> org.apache.tapestry.request.DecodedRequestInjector.service(DecodedRequestInjector.java:55)
>
> $ServletRequestServicer_103d206249c.service($ServletRequestServicer_103d206249c.java)
>
> org.apache.tapestry.multipart.MultipartDecoderFilter.service(MultipartDecoderFilter.java:52)
>
> $ServletRequestServicerFilter_103d2062485.service($ServletRequestServicerFilter_103d2062485.java)
>
> $ServletRequestServicerFilter_103d2062484.service($ServletRequestServicerFilter_103d2062484.java)
>
> $ServletRequestServicer_103d206249c.service($ServletRequestServicer_103d206249c.java)
>
> org.apache.tapestry.services.impl.SetupRequestEncoding.service(SetupRequestEncoding.java:53)
>
> $ServletRequestServicer_103d206249c.service($ServletRequestServicer_103d206249c.java)
>
> org.apache.tapestry.ApplicationServlet.doService(ApplicationServlet.java:125)
>
> org.apache.tapestry.ApplicationServlet.doGet(ApplicationServlet.java:89)
> javax.servlet.http.HttpServlet.service(HttpServlet.java:697)
> javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
> It would be better for end devlopers if Tapestry threw a message that said -
> cannot find custom Engine - "blah.Engine", please ensure that it is in your
> classpath. Or something like that.
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