Unable to start embedded Tomcat

There could be several reasons why you are unable to start the embedded Tomcat server. Here are a few common causes and solutions:

1. Port already in use: Check if the port on which your Tomcat server is running is not already in use by another application. If it is, either stop the other application or change the port on which Tomcat is running.

2. Missing dependencies: Make sure that all the required dependencies for Tomcat are present in your project's classpath. If any required dependency is missing, add it to your project's dependencies.

3. Configuration issues: Check if your Tomcat server's configuration is correct. Make sure that all the required properties are set correctly in the configuration file.

4. Memory issues: If your Tomcat server is running out of memory, increase the memory allocation for the server.

5. Firewall issues: Check if your firewall is blocking the Tomcat server from starting up. If it is, add an exception for Tomcat in your firewall rules.

If none of these solutions work, try looking at the Tomcat logs to see if there are any specific error messages that can help you identify the issue.