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    Thrown when an application is trying to use or access an object whose reference equals to null. You are probably trying to use a reference that points to no location in memory as though it were referencing an object.

Solutions on the web

via Oracle Community by 807587, 1 year ago
This exception has no message.
via Ecosystem JIRA by Arya Irani, 2 years ago
This exception has no message.
via GitHub by miho
, 2 years ago
via GitHub by Wavelandian
, 2 years ago
This exception has no message.
via Stack Overflow by Unknown author, 2 years ago
java.lang.NullPointerException at java.util.Hashtable.put(Hashtable.java:393) at javax.swing.JEditorPane.registerEditorKitForContentType(JEditorPane.java:1135) at javax.swing.JEditorPane.registerEditorKitForContentType(JEditorPane.java:1117) at javax.swing.JEditorPane.loadDefaultKitsIfNecessary(JEditorPane.java:1182) at javax.swing.JEditorPane.getKitTypeRegistry(JEditorPane.java:1152) at javax.swing.JEditorPane.createEditorKitForContentType(JEditorPane.java:1077) at javax.swing.JEditorPane.getEditorKitForContentType(JEditorPane.java:975) at javax.swing.JEditorPane.setContentType(JEditorPane.java:869) at com.piper.trilogiview.ui.warningcaution.Popup.<init>(Popup.java:73)