Tomcat can access normally while Websphere encounters an exception.

ner.exception.WebAppNotLoadedException: SRVE0200E: The project has stopped due to the following error: [reason].

This error typically indicates that an application on the WebSphere server failed to load correctly. This could be due to one of the following reasons:

1. There are mistakes or incomplete configurations in the deployment descriptor of the application (such as the web.xml file).
2. The application is missing or has incorrect dependencies.
3. There is an issue with the configuration of the WebSphere server, causing the application to not load correctly.

The steps to resolve this issue are as follows:

1. Review the deployment descriptor of the application (such as the web.xml file) to ensure that the configuration is correct.
2. Check the dependencies of the application and ensure they are correctly configured and deployed.
3. Review the configuration of the WebSphere server, particularly focusing on the settings related to application loading and deployment.

If the above steps still don’t solve the issue, it is recommended to check the WebSphere server’s log files for more detailed error information and to seek help on relevant forums or communities.