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    This happens when you try to instantiate a class that can't be instantiated, either because the class object is abstract, an interface, an array class, a primitive type, void, or because the class has no nullary constructor.

Solutions on the web

via Atlassian JIRA by Matt Ryall, 1 year ago
via Atlassian JIRA by Matt Ryall, 2 years ago
java.lang.InstantiationException: com.atlassian.confluence.plugin.test.TestAction	at java.lang.Class.newInstance0(Class.java:340)	at java.lang.Class.newInstance(Class.java:308)	at com.opensymphony.xwork.ObjectFactory.buildBean(ObjectFactory.java:97)	at com.opensymphony.xwork.ObjectFactory.buildAction(ObjectFactory.java:77)	at com.atlassian.confluence.plugin.ConfluencePluginObjectFactory.buildAction(ConfluencePluginObjectFactory.java:60)