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java.lang.RuntimeException: java.lang.NullPointerException	at org.apache.lenya.cms.publication.DefaultDocumentBuilder.isDocument(DefaultDocumentBuilder.java:119)	at sun.reflect.GeneratedMethodAccessor50.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:597)	at org.apache.avalon.excalibur.component.ComponentProxyGenerator$ComponentInvocationHandler.invoke(ComponentProxyGenerator.java:143)	at $Proxy44.isDocument(Unknown Source)