Caused by javalangIllegalStateException ContainerBaseaddChild start orgapachecatalinaLifecycleException Failed to start component StandardEngineCatalinaStandardHostlocalhostStandardContextweb-app

This exception is thrown when there is an error while starting the Tomcat container and deploying a web application. Specifically, it indicates that there was a failure in starting the component related to the specified context ([StandardEngine[Catalina].StandardHost[localhost].StandardContext[/web-app]]).

The root cause of this exception could be various issues, including:

1. Missing or incompatible libraries: Check if all the required libraries and dependencies are present and compatible with the Tomcat version you are using.

2. Incorrect configuration: Verify if the configuration files (e.g., web.xml, server.xml) are properly set up and don't contain any errors.

3. Port conflict: Ensure that the port specified for running Tomcat is not already in use by another application.

4. Invalid deployment descriptor: Check if the web application's deployment descriptor (web.xml) is properly configured and doesn't have any syntax errors.

5. Insufficient permissions: Make sure that the user running the Tomcat server has sufficient permissions to access the required files and directories.

To troubleshoot the issue, you can look for more detailed error messages or stack traces in the Tomcat logs (e.g., catalina.out, localhost.log). These logs will provide more specific information about the cause of the failure and help you narrow down the problem