App is crashing on onStart(), onStop() and onResume() fuctions [closed] - java

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Here is the the methods called in MainActivty class
I cant find an answer Please help

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"Supplied javaHome is not a valid folder. " visual studio code [closed]

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this is what the servelets exception i am getting
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I want to develop java swing application with Google map. But I could not be succeed. I have another problem is it possible with swing applications?
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I am Using Firebase client for android in my project and for last 4 days it throws random NullPointerException while connecting to Firebase.
Here is my stacktrace that I have found on BugSense:
java.lang.NullPointerException
1at com.firebase.tubesock.WebSocketHandshake.verifyServerHandshakeHeaders(WebSocketHandshake.java:95)
2at com.firebase.tubesock.WebSocket.run(WebSocket.java:147)
Thanks in advance in this regard

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