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

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Thrown when an application is trying to use or access an object whose reference equals to null but if you are getting no message, try using the option -XX:-OmitStackTraceInFastThrow.

java.lang.NullPointerException:
at java.io.Reader.(Reader.java:61)
at java.io.InputStreamReader.(InputStreamReader.java:80)
at org.simpleframework.xml.core.Persister.read(Persister.java:471)
at deviceContainer.DeviceCollectionXMLAO.readXML(DeviceCollectionXMLAO.java:15)
at testContainer.Temp.updateNode(Temp.java:44)
at testContainer.Temp.main(Temp.java:25)

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