Java. lang. NoSuchMethodError: javax. servlet. ServletContext. getClassLoader () Ljava/lang/ClassLoader;, ljavaclassloader

Java. lang. NoSuchMethodError: javax. servlet. ServletContext. getClassLoader () Ljava/lang/ClassLoader;, ljavaclassloader
The tomcat version does not support servlet3.0 when the server is set up on the computer in the lab. Therefore, the following information is displayed when the tomcat version is set up again.

Java. lang. NoSuchMethodError: javax. servlet. ServletContext. getClassLoader () Ljava/lang/ClassLoader;

Search for information on the Internet. For earlier versions, you can modify web. xml. servlet3.0 does not need to be modified.

Check stackoverflow and then check for seasick. Search for the internet. The solution is as follows:

Modify the servlet version in jre/lib \ ext (tomcat6.0) and copy the servlet jar package under tomcat7.0 lib to overwrite it.