Hi,
just playing around and determined attached exception.

cheers
gerhard
DEBUG   (2001-08-25) 12:02.13:430   [cocoon  ] (/cocoon/welcome) 
tcpConnection-8080-0/CachingStreamPipeline: Compared cached validity 
'TimeStampCacheValidity: 998733566389' with new validity 'TimeStampCacheValidity: 
998733566389' : valid
DEBUG   (2001-08-25) 12:02.13:430   [cocoon  ] (/cocoon/welcome) 
tcpConnection-8080-0/CachingStreamPipeline: Compared cached validity 
'TimeStampCacheValidity: 998733566570' with new validity 'TimeStampCacheValidity: 
998733566570' : valid
DEBUG   (2001-08-25) 12:02.13:430   [cocoon  ] (/cocoon/welcome) 
tcpConnection-8080-0/CachingStreamPipeline: Compared cached validity 
'NOPCacheValidity' with new validity 'NOPCacheValidity' : valid
DEBUG   (2001-08-25) 12:02.13:430   [cocoon  ] (/cocoon/welcome) 
tcpConnection-8080-0/CachingStreamPipeline: Using valid cached content for 'welcome'.
DEBUG   (2001-08-25) 12:02.13:440   [cocoon  ] (/cocoon/welcome) 
tcpConnection-8080-0/CachingEventPipeline: Recycling of CachingEventPipeline
DEBUG   (2001-08-25) 12:02.13:440   [cocoon  ] (/cocoon/welcome) 
tcpConnection-8080-0/DefaultPool: Returning a 
org.apache.cocoon.generation.FileGenerator to the pool
DEBUG   (2001-08-25) 12:02.13:440   [cocoon  ] (/cocoon/welcome) 
tcpConnection-8080-0/DefaultPool: Returning a 
org.apache.cocoon.transformation.TraxTransformer to the pool
DEBUG   (2001-08-25) 12:02.13:440   [cocoon  ] (/cocoon/welcome) 
tcpConnection-8080-0/DefaultPool: Returning a 
org.apache.cocoon.components.pipeline.CachingEventPipeline to the pool
DEBUG   (2001-08-25) 12:02.13:440   [cocoon  ] (/cocoon/welcome) 
tcpConnection-8080-0/CachingStreamPipeline: Recycling of CachingStreamPipeline
WARN    (2001-08-25) 12:02.13:440   [cocoon  ] (/cocoon/welcome) 
tcpConnection-8080-0/DefaultPool: Pool interrupted while waiting for lock.
java.lang.IllegalArgumentException: Result should not be null
        at 
org.apache.xalan.transformer.TransformerIdentityImpl.setResult(TransformerIdentityImpl.java:118)
        at 
org.apache.cocoon.serialization.HTMLSerializer.recycle(HTMLSerializer.java:56)
        at org.apache.avalon.excalibur.pool.DefaultPool.put(DefaultPool.java:170)
        at 
org.apache.avalon.excalibur.component.PoolableComponentHandler.put(PoolableComponentHandler.java:138)
        at 
org.apache.avalon.excalibur.component.ExcaliburComponentSelector.release(ExcaliburComponentSelector.java:391)
        at 
org.apache.cocoon.sitemap.SitemapComponentSelector.release(SitemapComponentSelector.java:70)
        at 
org.apache.cocoon.components.pipeline.AbstractStreamPipeline.recycle(AbstractStreamPipeline.java:266)
        at 
org.apache.cocoon.components.pipeline.CachingStreamPipeline.recycle(CachingStreamPipeline.java:395)
        at org.apache.avalon.excalibur.pool.DefaultPool.put(DefaultPool.java:170)
        at 
org.apache.avalon.excalibur.component.PoolableComponentHandler.put(PoolableComponentHandler.java:138)
        at 
org.apache.avalon.excalibur.component.ExcaliburComponentManager.release(ExcaliburComponentManager.java:420)
        at org.apache.cocoon.www.sitemap_xmap.process(sitemap_xmap.java:2153)
        at org.apache.cocoon.sitemap.Handler.process(Handler.java:162)
        at org.apache.cocoon.sitemap.Manager.invoke(Manager.java:106)
        at org.apache.cocoon.Cocoon.process(Cocoon.java:416)
        at org.apache.cocoon.servlet.CocoonServlet.service(CocoonServlet.java:538)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:103)
        at 
com.caucho.server.http.FilterChainServlet.doFilter(FilterChainServlet.java:82)
        at com.caucho.server.http.Invocation.service(Invocation.java:272)
        at com.caucho.server.http.CacheInvocation.service(CacheInvocation.java:128)
        at com.caucho.server.http.HttpRequest.handleRequest(HttpRequest.java:216)
        at com.caucho.server.http.HttpRequest.handleConnection(HttpRequest.java:158)
        at com.caucho.server.TcpConnection.run(TcpConnection.java:140)
        at java.lang.Thread.run(Thread.java:484)
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