[Solved] NullPointerException Runtimer Error [closed]

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The problem is here:

contentPane.add(textPane, BorderLayout.CENTER);

At this point, you haven’t set up textPane. You set it up 4 lines later:

textPane = new JTextPane();
textPane.setBackground(Color.DARK_GRAY);
textPane.setEditable(false);
textPane.setMargin(null);
textPane.setContentType("text/html");

You need to add it to the pane after initializing.

Simple debugging would have fixed this problem for you. SO is not an appropriate place for “fix my code” questions.

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solved NullPointerException Runtimer Error [closed]