Java. lang. NoClassDefFoundError: ognl/PropertyAccessor solution, ognl expression

Java. lang. NoClassDefFoundError: ognl/PropertyAccessor solution, ognl expression

I didn't want to write a special article for this article, but I found that no one answered such a simple question. From the perspective of convenient search, I took this question specially.

In fact, the solution is to add the jar package of ognl. For example, I use ognl3.0.6, as shown in:

Struts2 cannot run. There is a pilot package, but it is 404

Struts2-gxp-plugin-2.3.16.3.jar this package seems incomplete
 
Myeclipse tomcat startup error javalangNoClassDefFoundError: ognl/PropertyAccessor

This package was added later, and has it been re-released in tomcat; otherwise, there is no package in tomcatl.