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https://issues.apache.org/jira/browse/TAPESTRY-2353?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12588352#action_12588352
 ] 

Philip Lopez commented on TAPESTRY-2353:
----------------------------------------

There seems to be a bug in 5.0.11 where mandatory parameters to components 
trigger this behaviour. It's fixed in 5.0.12-SNAPSHOT at time of writing.

> initCause in errorFilter causes IllegalStateException
> -----------------------------------------------------
>
>                 Key: TAPESTRY-2353
>                 URL: https://issues.apache.org/jira/browse/TAPESTRY-2353
>             Project: Tapestry
>          Issue Type: Bug
>          Components: tapestry-core
>    Affects Versions: 5.0.11
>         Environment: Tomcat 5.5.25 
>            Reporter: Josh Canfield
>
> Having <t:unless> with no test parameter throws a TapestryException. 
> I've also seen this when trying to @Inject a service which hasn't been 
> configured.
> When the errorFilter gets the exception it finds that there is no cause set, 
> and tries to init one. This throws the following exception: 
> java.lang.IllegalStateException: Can't overwrite cause
>       java.lang.Throwable.initCause(Throwable.java:320)
>       
> org.apache.tapestry.services.TapestryModule$2.service(TapestryModule.java:535)
>       $RequestHandler_11943ca9edc.service($RequestHandler_11943ca9edc.java)
>       
> org.apache.tapestry.internal.services.StaticFilesFilter.service(StaticFilesFilter.java:79)
>       $RequestHandler_11943ca9edc.service($RequestHandler_11943ca9edc.java)
>       
> org.apache.tapestry.internal.services.CheckForUpdatesFilter$2.invoke(CheckForUpdatesFilter.java:93)
>       
> org.apache.tapestry.internal.services.CheckForUpdatesFilter$2.invoke(CheckForUpdatesFilter.java:84)
>       
> org.apache.tapestry.ioc.internal.util.ConcurrentBarrier.withRead(ConcurrentBarrier.java:77)
>       
> org.apache.tapestry.internal.services.CheckForUpdatesFilter.service(CheckForUpdatesFilter.java:106)
>       $RequestHandler_11943ca9edc.service($RequestHandler_11943ca9edc.java)
>       $RequestHandler_11943ca9ed2.service($RequestHandler_11943ca9ed2.java)
>       
> org.apache.tapestry.services.TapestryModule$12.service(TapestryModule.java:924)
>       
> org.apache.tapestry.upload.internal.services.MultipartServletRequestFilter.service(MultipartServletRequestFilter.java:43)
>       
> $HttpServletRequestHandler_11943ca9ed3.service($HttpServletRequestHandler_11943ca9ed3.java)
>       
> org.apache.tapestry.internal.services.IgnoredPathsFilter.service(IgnoredPathsFilter.java:62)
>       
> $HttpServletRequestFilter_11943ca9ed1.service($HttpServletRequestFilter_11943ca9ed1.java)
>       
> $HttpServletRequestHandler_11943ca9ed3.service($HttpServletRequestHandler_11943ca9ed3.java)
>       
> $HttpServletRequestHandler_11943ca9ecf.service($HttpServletRequestHandler_11943ca9ecf.java)
>       org.apache.tapestry.TapestryFilter.doFilter(TapestryFilter.java:168)

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