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Starting and stopping Tomcat
We have two choices: to start up Tomcat outside or inside Eclipse. The
difference between the two is, that if we want to use Eclipse's debug features
on jsp-pages or Java classes, Tomcat must be started inside Eclipse. Debugging
is of course a very important feature, so let's see how we manage Tomcat from
Eclipse. First some customization (I assume that the Java Perspective is
selected):
Select Window/Customize Perspective and then mark the Tomcat checkbox to get
Tomcat in the menu and in the tool bar:
The menu and tool bar now looks like this, giving you two ways to start, restart
and stop Tomcat:
If you now start Tomcat, you'll see the output from the start up process in
Eclipse's console:
Debugging jsp-pages
Having everything set up we're now ready to see how debugging works. We'll start
with a simple jsp page:
In the browser we enter this URL:
http://localhost:8080/Tom1/hello.jsp
If everything has been set up correctly you should see this:
It's also possible to debug a jsp-page, but unfortunately the plug-in does not
work at the jsp-page level, but rather at the servlet-level. From the jsp-file
Tomcat has generated a Java- servlet and compiled it. The result is found in the
work- directory. Right-click on this directory in Eclipse and do a Refresh:
You may now open the generated Java file and set a breakpoint:
The blue circle marks the breakpoint. Now do a refresh in your browser. This
will open Eclipse's debug perspective, and processing will halt at the
breakpoint:
Remember that changes to the servlet code while debugging is not reflected in
the jsp-pages.
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