IntelliJ IDEA中Tomcat启动报错，JSP应用部署失败求助

Let's break down the root causes from your logs first:

• The warning Unknown version string [3.1] is a critical clue: your Tomcat 7.0.56 only supports Servlet 3.0 and below, but your project's configuration is using Servlet 3.1. This mismatch is triggering the subsequent listener and context startup failures.
• The SEVERE: Error listenerStart is a follow-up issue from the invalid Servlet version, but we’ll cover how to debug it if needed.

Here’s a step-by-step solution:

1. Correct Servlet Version in web.xml #

Your web.xml is configured with an incompatible Servlet version. Update it to match Tomcat 7’s supported Servlet 3.0:

<web-app xmlns="http://java.sun.com/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
         version="3.0">

Ensure all attributes (namespace, schema location, and version) match the snippet above to avoid configuration parsing errors.

2. Debug Listener Startup Failures (If Needed) #

If you still see Error listenerStart after fixing the Servlet version, we need more detailed logs to pinpoint the problematic listener:

• Navigate to your Tomcat’s conf/logging.properties file
• Find the line org.apache.catalina.core.ContainerBase.[Catalina].[localhost].level and change its value from INFO to FINE
• Restart Tomcat—this will log exact exceptions from the failing listener, so you can fix the corresponding class or configuration.

3. Verify IntelliJ Tomcat Configuration #

Double-check that your IntelliJ setup aligns with your local Tomcat installation:

• Open Run/Debug Configurations in IntelliJ
• Select your Tomcat server instance:
  • Under the Server tab, confirm the Tomcat home points to C:\xampp\tomcat
  • Under the Deployment tab, ensure your Book Manger:war exploded artifact is correctly added and there are no missing dependencies.

4. Clear Caches and Redeploy #

Cached files can cause unexpected issues, so let’s clean them up:

• In IntelliJ, go to File > Invalidate Caches... and choose Invalidate and Restart
• Delete the work directory in your Tomcat installation (C:\xampp\tomcat\work)—this clears compiled JSPs and temporary runtime files
• Redeploy your project to Tomcat.

内容的提问来源于stack exchange，提问作者Andrew