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Posted to dev@cocoon.apache.org by Bart Molenkamp <b....@bizzdesign.nl> on 2006/12/21 17:11:56 UTC
[2.2] NPE when using block: protocol, caused by a ResourceNotFoundException
Hi,
While using the block: protocol, I got NullPointerExceptions because a
resource could not be found in the target block. This was due to a
ResourceNotFoundException, and when Cocoon tries to report the
exception, the NPE occurs.
It seems that the outputStream member is null. Has anybody any idea
where this should be set? The exception is quite confusing, because I
can't see the original ResourceNotFoundException.
Here is the stacktrace:
java.lang.NullPointerException
at
org.apache.cocoon.blocks.util.BlockCallHttpServletResponse$1.write(Block
CallHttpServletResponse.java:158)
at java.io.OutputStream.write(OutputStream.java:99)
at java.io.OutputStream.write(OutputStream.java:58)
at
org.apache.cocoon.components.notification.Notifier.notifyHTML(Notifier.j
ava:104)
at
org.apache.cocoon.components.notification.Notifier.notify(Notifier.java:
49)
at
org.apache.cocoon.servlet.RequestProcessor.manageException(RequestProces
sor.java:306)
at
org.apache.cocoon.servlet.RequestProcessor.service(RequestProcessor.java
:176)
at
org.apache.cocoon.sitemap.SitemapServlet.service(SitemapServlet.java:61)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
at
org.apache.cocoon.blocks.BlockContext$PathDispatcher.forward(BlockContex
t.java:461)
at
org.apache.cocoon.blocks.BlockContext$NamedDispatcher.forward(BlockConte
xt.java:404)
at
org.apache.cocoon.blocks.BlockConnection.getInputStream(BlockConnection.
java:115)
at
org.apache.cocoon.blocks.components.BlockSource.getInputStream(BlockSour
ce.java:51)
at
org.apache.cocoon.reading.ResourceReader.generate(ResourceReader.java:32
7)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.jav
a:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessor
Impl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at
org.apache.cocoon.core.container.spring.avalon.PoolableFactoryBean$Proxy
Handler.invoke(PoolableFactoryBean.java:349)
at $Proxy4.generate(Unknown Source)
at
org.apache.cocoon.components.pipeline.impl.AbstractCachingProcessingPipe
line.processReader(AbstractCachingProcessingPipeline.java:878)
at
org.apache.cocoon.components.pipeline.AbstractProcessingPipeline.process
(AbstractProcessingPipeline.java:429)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.jav
a:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessor
Impl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at
org.apache.cocoon.core.container.spring.avalon.PoolableFactoryBean$Proxy
Handler.invoke(PoolableFactoryBean.java:349)
at $Proxy3.process(Unknown Source)
at
org.apache.cocoon.components.treeprocessor.sitemap.ReadNode.invoke(ReadN
ode.java:94)
at
org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.
invokeNodes(AbstractParentProcessingNode.java:55)
at
org.apache.cocoon.components.treeprocessor.sitemap.MatchNode.invoke(Matc
hNode.java:87)
at
org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.
invokeNodes(AbstractParentProcessingNode.java:77)
at
org.apache.cocoon.components.treeprocessor.sitemap.PipelineNode.invoke(P
ipelineNode.java:152)
at
org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.
invokeNodes(AbstractParentProcessingNode.java:77)
at
org.apache.cocoon.components.treeprocessor.sitemap.PipelinesNode.invoke(
PipelinesNode.java:93)
at
org.apache.cocoon.components.treeprocessor.ConcreteTreeProcessor.process
(ConcreteTreeProcessor.java:239)
at
org.apache.cocoon.components.treeprocessor.ConcreteTreeProcessor.process
(ConcreteTreeProcessor.java:170)
at
org.apache.cocoon.components.treeprocessor.TreeProcessor.process(TreePro
cessor.java:233)
at
org.apache.cocoon.servlet.RequestProcessor.process(RequestProcessor.java
:377)
at
org.apache.cocoon.servlet.RequestProcessor.service(RequestProcessor.java
:155)
at
org.apache.cocoon.sitemap.SitemapServlet.service(SitemapServlet.java:61)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
at
org.apache.cocoon.blocks.BlockContext$PathDispatcher.forward(BlockContex
t.java:461)
at
org.apache.cocoon.blocks.BlockContext$PathDispatcher.forward(BlockContex
t.java:443)
at
org.apache.cocoon.blocks.BlockServlet.service(BlockServlet.java:123)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
at
org.apache.cocoon.blocks.DispatcherServlet.service(DispatcherServlet.jav
a:128)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
at
org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:428)
at
org.mortbay.jetty.servlet.WebApplicationHandler.dispatch(WebApplicationH
andler.java:473)
at
org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:568)
at org.mortbay.http.HttpContext.handle(HttpContext.java:1530)
at
org.mortbay.jetty.servlet.WebApplicationContext.handle(WebApplicationCon
text.java:633)
at org.mortbay.http.HttpContext.handle(HttpContext.java:1482)
at org.mortbay.http.HttpServer.service(HttpServer.java:909)
at
org.mortbay.http.HttpConnection.service(HttpConnection.java:820)
at
org.mortbay.http.HttpConnection.handleNext(HttpConnection.java:986)
at
org.mortbay.http.HttpConnection.handle(HttpConnection.java:837)
at
org.mortbay.http.SocketListener.handleConnection(SocketListener.java:245
)
at
org.mortbay.util.ThreadedServer.handle(ThreadedServer.java:357)
at
org.mortbay.util.ThreadPool$PoolThread.run(ThreadPool.java:534)
Thanks,
Bart.
Re: [2.2] NPE when using block: protocol, caused by a ResourceNotFoundException
Posted by Alexander Klimetschek <al...@mindquarry.com>.
Hi Bart,
I had the same problem and fixed it with a patch:
https://issues.apache.org/jira/browse/COCOON-1954
Unfortunately it is not committed yet, because it was unclear if this
might break some specific old problem.
The problem is that the original exception is swallowed, so the "called"
block tries to write the error page into the blockconnection stream,
which is not possible due to a difficult (and currently wrong)
implementation of BlockCallHttpServletResponse.reset(). But this is no
problem, since the caller (the calling block) cannot handle the error
page anyway, it might be expecting xml anyway. So the exception should
be passed on so that it is catched in the exception handler of the
calling block - which then can write the error page into the response to
the browser.
Alex
Bart Molenkamp schrieb:
> Hi,
>
> While using the block: protocol, I got NullPointerExceptions because a
> resource could not be found in the target block. This was due to a
> ResourceNotFoundException, and when Cocoon tries to report the
> exception, the NPE occurs.
>
> It seems that the outputStream member is null. Has anybody any idea
> where this should be set? The exception is quite confusing, because I
> can't see the original ResourceNotFoundException.
>
> Here is the stacktrace:
>
> java.lang.NullPointerException
> at
> org.apache.cocoon.blocks.util.BlockCallHttpServletResponse$1.write(Block
> CallHttpServletResponse.java:158)
> at java.io.OutputStream.write(OutputStream.java:99)
> at java.io.OutputStream.write(OutputStream.java:58)
> at
> org.apache.cocoon.components.notification.Notifier.notifyHTML(Notifier.j
> ava:104)
> at
> org.apache.cocoon.components.notification.Notifier.notify(Notifier.java:
> 49)
> at
> org.apache.cocoon.servlet.RequestProcessor.manageException(RequestProces
> sor.java:306)
> at
> org.apache.cocoon.servlet.RequestProcessor.service(RequestProcessor.java
> :176)
> at
> org.apache.cocoon.sitemap.SitemapServlet.service(SitemapServlet.java:61)
> at javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
> at
> org.apache.cocoon.blocks.BlockContext$PathDispatcher.forward(BlockContex
> t.java:461)
> at
> org.apache.cocoon.blocks.BlockContext$NamedDispatcher.forward(BlockConte
> xt.java:404)
> at
> org.apache.cocoon.blocks.BlockConnection.getInputStream(BlockConnection.
> java:115)
> at
> org.apache.cocoon.blocks.components.BlockSource.getInputStream(BlockSour
> ce.java:51)
> at
> org.apache.cocoon.reading.ResourceReader.generate(ResourceReader.java:32
> 7)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.jav
> a:39)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessor
> Impl.java:25)
> at java.lang.reflect.Method.invoke(Method.java:585)
> at
> org.apache.cocoon.core.container.spring.avalon.PoolableFactoryBean$Proxy
> Handler.invoke(PoolableFactoryBean.java:349)
> at $Proxy4.generate(Unknown Source)
> at
> org.apache.cocoon.components.pipeline.impl.AbstractCachingProcessingPipe
> line.processReader(AbstractCachingProcessingPipeline.java:878)
> at
> org.apache.cocoon.components.pipeline.AbstractProcessingPipeline.process
> (AbstractProcessingPipeline.java:429)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.jav
> a:39)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessor
> Impl.java:25)
> at java.lang.reflect.Method.invoke(Method.java:585)
> at
> org.apache.cocoon.core.container.spring.avalon.PoolableFactoryBean$Proxy
> Handler.invoke(PoolableFactoryBean.java:349)
> at $Proxy3.process(Unknown Source)
> at
> org.apache.cocoon.components.treeprocessor.sitemap.ReadNode.invoke(ReadN
> ode.java:94)
> at
> org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.
> invokeNodes(AbstractParentProcessingNode.java:55)
> at
> org.apache.cocoon.components.treeprocessor.sitemap.MatchNode.invoke(Matc
> hNode.java:87)
> at
> org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.
> invokeNodes(AbstractParentProcessingNode.java:77)
> at
> org.apache.cocoon.components.treeprocessor.sitemap.PipelineNode.invoke(P
> ipelineNode.java:152)
> at
> org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.
> invokeNodes(AbstractParentProcessingNode.java:77)
> at
> org.apache.cocoon.components.treeprocessor.sitemap.PipelinesNode.invoke(
> PipelinesNode.java:93)
> at
> org.apache.cocoon.components.treeprocessor.ConcreteTreeProcessor.process
> (ConcreteTreeProcessor.java:239)
> at
> org.apache.cocoon.components.treeprocessor.ConcreteTreeProcessor.process
> (ConcreteTreeProcessor.java:170)
> at
> org.apache.cocoon.components.treeprocessor.TreeProcessor.process(TreePro
> cessor.java:233)
> at
> org.apache.cocoon.servlet.RequestProcessor.process(RequestProcessor.java
> :377)
> at
> org.apache.cocoon.servlet.RequestProcessor.service(RequestProcessor.java
> :155)
> at
> org.apache.cocoon.sitemap.SitemapServlet.service(SitemapServlet.java:61)
> at javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
> at
> org.apache.cocoon.blocks.BlockContext$PathDispatcher.forward(BlockContex
> t.java:461)
> at
> org.apache.cocoon.blocks.BlockContext$PathDispatcher.forward(BlockContex
> t.java:443)
> at
> org.apache.cocoon.blocks.BlockServlet.service(BlockServlet.java:123)
> at javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
> at
> org.apache.cocoon.blocks.DispatcherServlet.service(DispatcherServlet.jav
> a:128)
> at javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
> at
> org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:428)
> at
> org.mortbay.jetty.servlet.WebApplicationHandler.dispatch(WebApplicationH
> andler.java:473)
> at
> org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:568)
> at org.mortbay.http.HttpContext.handle(HttpContext.java:1530)
> at
> org.mortbay.jetty.servlet.WebApplicationContext.handle(WebApplicationCon
> text.java:633)
> at org.mortbay.http.HttpContext.handle(HttpContext.java:1482)
> at org.mortbay.http.HttpServer.service(HttpServer.java:909)
> at
> org.mortbay.http.HttpConnection.service(HttpConnection.java:820)
> at
> org.mortbay.http.HttpConnection.handleNext(HttpConnection.java:986)
> at
> org.mortbay.http.HttpConnection.handle(HttpConnection.java:837)
> at
> org.mortbay.http.SocketListener.handleConnection(SocketListener.java:245
> )
> at
> org.mortbay.util.ThreadedServer.handle(ThreadedServer.java:357)
> at
> org.mortbay.util.ThreadPool$PoolThread.run(ThreadPool.java:534)
>
> Thanks,
> Bart.
>
>
--
Alexander Klimetschek
http://www.mindquarry.com