Spring Tomcat7错误“org.springframework.web.SpringServletContainerInitializer无法强制转换为javax.servlet.ServletContainerInitializer”

Question

I am getting below error while starting the Tomcat7 server.

org.springframework.web.SpringServletContainerInitializer cannot be cast to javax.servlet.ServletContainerInitializer

I am just curious to find the root cause of this issue. In what scenario this error happens? I didn't get the error when I use Tomcat Enterprise Edition(TomEE)

In my project ServletContainerInitializer is getting loaded from javeee-api-7.0.jar

I have tried excluding the javax.servlet-api which is getting loaded from javeee-api but thats not working

Answer 1

添加javeee-api-7.0.jar，它适合我。

Answer 2

We encountered this case in our project that contained loads of legacy code that was obviously not really well maintained.

We solved it by analyzing all dependencies inside all pom.xml files. For this issue particularly, what we did was to exclude javax.servlet api because there was a conflicting version that loaded and caused the cast error.

If you use eclipse, when opening the pom.xml files, you can check the dependencies with the Dependency Hierarchy tab at the bottom. There you can use the filter to see all servlet jars versions, and the top-level dependency that uses them. You can then exclude the problematic ones by right clicking on them and selecting "Exclude Maven Artifact..." And then the obvious: save your pom.xml, eventually repeat for other projects/modules, update your maven project configuration and finally build/install/run to see if the problem is fixed.

Hope that helps!