Java Swing text editor throws NullPointerException?

The variable myPane is not initialized ( null ). This causes the NullPointerException You create a new JEditorPane (around line 65) but assign it to a local variable, so the class member with the same name is still null (and actionPerformed uses the class member variable myPane ). Change line 65 JEditorPane myPane = new JEditorPane() to myPane = new JEditorPane().

The variable myPane is not initialized (null). This causes the NullPointerException. You create a new JEditorPane (around line 65) but assign it to a local variable, so the class member with the same name is still null (and actionPerformed uses the class member variable myPane).

Change line 65 JEditorPane myPane = new JEditorPane(); to myPane = new JEditorPane().

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