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    Thrown when an application is trying to use or access an object whose reference equals to null. You are probably trying to use a reference that points to no location in memory as though it were referencing an object.

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via Oracle Community by 807555, 1 year ago
This exception has no message.
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This exception has no message.
via GitHub by jprante
, 2 years ago
This exception has no message.
java.lang.NullPointerException: 	at java.util.Hashtable.put(Hashtable.java:385)	at java.awt.GridBagLayout.setConstraints(GridBagLayout.java:357)	at NetClient.(NetClient.java:94)	at NetClient.main(NetClient.java:144)