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java.lang.NullPointerException: 	at FileUploadBean.uploadFile(FileUploadBean.java:54)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:597)	at org.apache.el.parser.AstValue.invoke(AstValue.java:264)	at org.apache.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:278)	at com.sun.faces.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:105)	at org.icefaces.ace.component.fileentry.FileEntry.broadcast(FileEntry.java:306)