Startup Error: java.lang.IncompatibleClassChangeError: org/apache/struts2/convention/DefaultClassFinder$InfoBuildingVisitor
问题 I have a Struts2 application, originally XML-based, but now for the first time I introduced an Annotation-based action, and the application broke on startup. Given the following Action mapping, on startup of the application, I get the error java.lang.InstantiationError: com.opensymphony.xwork2.util.finder.ClassFinder at org.apache.struts2.convention.PackageBasedActionConfigBuilder.findActions(PackageBasedActionConfigBuilder.java:390) at org.apache.struts2.convention