File | Settings | Build, Execution, Deployment | Debugger for Windows and Linux IntelliJ IDEA | Preferences | Build, Execution, Deployment | Debugger for macOS Ctrl+Alt+S
Use this page to configure behavior of the Debugger and customize its view.
Focus application on breakpoint
If this checkbox is selected, on hitting a breakpoint, IntelliJ IDEA will show the location of this breakpoint in the editor and will attempt to bring its frame to the front.
Show debug window on breakpoint
Is this checkbox is selected, IntelliJ IDEA activates the Debug Tool Window on hitting a breakpoint.
Hide debug window on process termination
Automatically hide the Debug window when the debugged program terminates.
Scroll execution point to center
If this checkbox is selected, the line with the current execution point will be kept in the middle of the screen.
Select transport for connection to the process. Available options are socket and shared memory, which is available for Windows systems only.
Force classic VM for JDK 1.3.x and earlier
Check this option to launch process to be debugged with classic VM.
With this option you can control whether the -Djava.compiler=NONE parameter is specified when the application is launched. This parameter affects JIT compiler, and if the option is turned on, JIT compiler will be disabled.
Show alternative source switcher
The alternative source switcher appears on top of the editor, if in project there is more than one class with the same fully qualified name.
Kill the debug process immediately
Select this checkbox, if you want to soft kill the Java process.
Use this spin box to specify the port on which the built-in web server runs. By default this port is set to port 63343 through which IntelliJ IDEA accepts connections from services. You can set the port number to any other value starting with 1024 and higher.
Can accept external connections
If this checkbox is selected, then the files on the built-in server running on the specified port are accessible from another computer. If this checkbox is cleared (by default), then the debugger listens only to local connections.
Allow unsigned requests
For security reasons, any request to a page on the built-in server from outside IntelliJ IDEA is by default rejected and the following authorization pop-up window is displayed: To access the requested page, click Copy authorization URL to clipboard and paste the generated token in the address bar of the browser.
However this behaviour may be annoying, for example, it may block your debugging session if manual intervention is impossible. To suppress displaying the authorization pop-up window, select the Allow unsigned requests checkbox.