ERROR: NullPointerException encountered while trying to adding String to Deque that is set to null. java.lang.NullPointerException INFO: Successful at adding String to Deque that is set to null ...

java.lang.IllegalStateException: Captured type parameter T from generic non-reified function. Such functionality cannot be supported as T is erased, either specify serializer explicitly or make ...

Stack trace [15:36:39 ERROR]: Packet encoding of packet ID 85 threw (skippable? false) java.lang.NullPointerException: Cannot invoke "it.unimi.dsi.fastutil.objects.ObjectArrayList.get (int)" because ...

Then there’s the NullPointerException. Null pointer exception is an “exception” (error) that is particularly common when programming in Java.