Tomcat logging stdout stderr

It's in red because it's written to standard error (System.err), assuming you're using a normal configuration.

Theoretically, the way to fix this is to adjust the logging configuration (which appears to be java.util.logging based) so that messages at INFO level and below are written to standard out instead. Unfortunately, this is a little bit messier than it might be because the ConsoleHandler class is hard-coded to write to standard error, and if you mix between writing to standard out and standard error, there's a good chance that you'll end up getting the logging messages written out of order. (That's bad. Very confusing.) You could fix it by subclassing StreamHandler and doing a lot of fiddling around – e.g., override publish so it sets the output stream if logging changes from high-level to low-level or vice versa – but I really doubt that the results are going to be what you desire. It's also going to be slow.

Since in a production deployment of Tomcat you don't log to the console anyway (it logs to files by default) I suggest stopping worrying about this.

You've another instance of Tomcat already running. You can confirm this by going to http://localhost:8080 in your webbrowser and check if you get the Tomcat default home page or a Tomcat-specific 404 error page. Both are equally valid evidence that Tomcat runs fine; if it didn't, then you would have gotten a browser specific HTTP connection timeout error message.

You need to shutdown it. Go to /bin subfolder of the Tomcat installation folder and execute the shutdown.bat (Windows) or shutdown.sh (Unix) script. If in vain, close Eclipse and then open the task manager and kill all java and/or javaw processes.

Or if you actually installed it as a Windows service for some reason (this is namely intented for production and is unhelpful when you're just developing), open the services manager (Start > Run > services.msc) and stop the Tomcat service. If necessary, uninstall the Windows service altogether. For development, just the ZIP file is sufficient.

Or if your actual intent is to run two instances of Tomcat simultaneously, then you have to configure the second instance to listen on different ports. Consult the Tomcat documentation for more detail.