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There are a number of options available to debug your application in IntelliJ.
If not done already prepare your application for remote debugging as described here: Enable remote debugging
Next we need to link the IntelliJ project with the deployed webapp.
Within IntelliJ, open the project containing the webapp deployed into jetty that you want to debug. SelectRun -> Edit Configurations. Add a new configuration by clicking the "+" icon. Choose Remote. Make sure the port you choose is the same as the one you added in Enable remote debugging.
Next in your webapp you can set a breakpoint within a servlet which when it is tripped will halt the remote jvm's processing thread to await for debugging commands from your IntelliJ instance. To set a breakpoint, simply open the servlet or any other class you want to debug and click left to the line you want to set the breakpoint at (where the red dot is on the next screenshot). The red dot and red background on the line mark the breakpoint.
Accessing that servlet within your browser, pointed at your remote debug configurated jetty-distribution, should transition your IntelliJ instance to the standard debugger view.
Since Jetty can be incredibly simple to embed, many people choose to create a small
method which they can launch directly within IntelliJ in order to more easily debug their entire
The best place to get started on this approach is to look through
Once you have a main method defined in order to launch your application, open the source file and right-click the main method. Select Debug or simply hit CTRL+SHIFT+D. In your Console tab within IntelliJ you should see your application startup and once it has completed startup you should be able to configure breakpoints and hit the Jetty instance as normal via your web browser. The same thing works for unit tests. Instead of the main method run debug on the test method you want to debug.
Debugging in IntelliJ is extremely powerful. For example it's possible to have conditional breakpoints that only trigger a break if the configured conditions are met. Have a look at the various tutorials in the internet or the IntelliJ documentation for further details.
You can easily configure logging through a
file. If this file is on your classpath then Jetty will use it for configuring logging, we use this
approach extensively throughout Jetty development and it makes life ever so much easier. You can see
this in action in the
Configuring Jetty StdErrLog