问题
i got this error when starting the app.
SEVERE: Exception starting filter struts2 java.lang.ClassNotFoundException:
org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter
and the server gave this error twice in a row.
i have struts2-core-2.3.15.2.jar in WEB-INF/lib and imported into build path.. i do not understand why StrutsPrepareAndExecuteFilter cannot be found.
the application can get started. thats no problem. the problem is because of this error, struts2 cannot redirect the action.
i use tomcat 7 and struts2 2.3.16. cuz it's tomcat 7, the servelet-api is not 3.0 i guess. i tried to put servelet-api-3.0 in tomcat/lib. but it's not compatible.
whats the problem?
Jars used
回答1:
The following minimum jars should be on your classpath:
- asm-3.3.jar
- asm-commons-3.3.jar
- asm-tree-3.3.jar
- commons-fileupload-1.3.jar
- commons-io-2.2.jar
- commons-lang3-3.1.jar
- commons-logging-1.1.3.jar
- freemarker-2.3.19.jar
- javassist-3.11.0.GA.jar
- log4j-1.2.17.jar
- ognl-3.0.6.jar
- struts2-core-2.3.16.jar
- xwork-core-2.3.16.jar
You can also follow How To Create A Struts 2 Web Application.
回答2:
the runtime problem was solved eventually by replacing the json jars package.. i think its the versions problems. it is a whole package. i dont remember the link now..
so it seems its better get the jar files from one source but not pick different version.. and these 6 jars should be included together. of course, be careful with the versions. i dont know mine. but it works.
commons-lang.jar
commons-logging.jar
commons-beanutils.jar
commons-collections.jar
json-lib-2.2.2-jdk15.jar
ezmorph.jar
BUT this problem is still there... I have this error, but the app can run
java.lang.ClassNotFoundException:
org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter
回答3:
Maybe the jars in WEB-INF/lib aren't copied to WEB-INF/lib of Tomcat. Please see the Deployment assembly property pages, which allow you to add flexible resource and dependency mapping to your applications.
回答4:
If you are using external JRE, it may not work. Instead use the internal JRE (which is inside JDK)
In the project
Go to Build path
-->Configure Build path
-->Libraries
-->Add Libraries
-->Installed JRRs
--> Give path of "JDK"(and not external JRE)
-->Finish.
Refresh the project and it would work.
回答5:
If you use Intellij IDEA, the reason maybe you did not add struts-xxx.xxx.jar file to artifacts.To solve this problem you just need open Project structure >> problems >> add struts x.x.x to artifacts(righit click on the problem option)
It works for me ,may it helps you.
来源：https://stackoverflow.com/questions/23220862/classnotfoundexception-strutsprepareandexecutefilter-in-struts2