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Paint Binary Search Tree to Scroll Pane in GUI

Kyle Woolsey
Posts: 2
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Hi, I am making a GUI which will allow a user to enter in values and have them displayed visually in a binary search tree. I think the code I am using to create the binary search tree should work, but am having trouble calling the class with the paint instructions to my GUI(scroll pane) as it immediately requires a value, before I can enter one, and throws a null pointer exception.

How can I call the class which creates the Binary Search Tree without throwing this exception

GUI Class

Tree Panel Class which creates Binary Search Tree

Thanks Kyle
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