Null pointer exception is an “exception” (error) that is particularly common when programming in Java. For a beginner, this is a confusing and daunting message to receive, but it can be just ...

The output from both examples looks like this: ERROR: NullPointerException encountered while trying to adding String to Deque that is set to null. java.lang.NullPointerException ...

Learn everything you need to throw, try, catch, and clean up after Java exceptions in your programs.