Exception starting filter struts2 java.lang.ClassNotFoundException: org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter [duplicate]

Answer 1

I figured out my problem was that I forgot to export my user defined libraries, in this case, struts libraries. You can export the libraries via Eclipse by

1. Go to the Markers tab (If you can't see, do Windows > Show View > Markers)
2. Expand "Classpath Dependency Validator Message"
3. Right click "Classpath entry org.eclipse.jdt.USER_LIBRARY/struts2 will not be exported or published. Runtime ClassNotFoundExceptions may result."
4. Click "Quick Fix"
5. Select "Mark the associated raw classpath entry as a publish/export dependency."
6. click "Finish"

Answer 2

There could be some reasons to get this error. One of the reason can be the version of jar you use does not have the required class. Check struts2-core-X.X.X.X.jar, and make sure that it contains StrutsPrepareAndExecuteFilter class under org.apache.struts2.dispatcher.ng.filter package.

Answer 3

I had the same problem. I was able to solve it by adding a few more jar files. You must have at least the following jar files:

1. commons-fileupload-X.X.X.jar
2. commons-io-X.X.jar
3. commons-lang-X.X.jar
4. commons-logging-X.X.X.jar
5. commons-logging-api-X.X.jar
6. commons-lang3-X.X.jar
7. freemaker-X.X.X.jar
8. javassist-X.X.X.GA.jar
9. ognl-X.X.X.jar
10. struts2-core-X.X.X.X.jar
11. xwork-core-X.X.X.X.jar

Answer 4

Use the following jars and remove all others.

• commons-fileupload-1.3.jar
• commons-io-2.0.1.jar
• commons-lang3-3.1.jar
• commons-logging-1.1.3.jar
• freemarker-2.3.19.jar
• javassist-3.11.0.GA.jar
• ognl-3.0.6.jar
• struts2-core-2.3.15.1.jar
• xwork-core-2.3.15.1.jar