java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at undefined.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 org.icefaces.ace.component.fileentry.FileEntry.broadcast(FileEntry.java:306)

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