Debugging a CAP Application

Debugging a CAP project in SAP Business Application Studio (BAS) is quite easy, as BAS provides built-in debugging support for the Node.js runtime.

Watch the video to see how to switch on debug mode.

Breakpoints can be set by clicking on the left edge of the editor or by pressing F9 in the current line. A red dot appears to indicate that a breakpoint has been set for this line.

If you click on a set breakpoint again, it will be removed.

As soon as a request hits a line with a breakpoint, the debugger in BAS pauses execution and allows you to check variables, watch expressions and control the flow.

In the Run and Debug view, the following sections are displayed, among others, which can contain helpful information when debugging:

• VARIABLES

  The Variables section shows the current values of the variables in scope.

• WATCH

  In the Watch section, you can add any expressions that you want to keep an eye on when stepping through the code.

• CALL STACK

  The Call Stack section shows the current call stack.

The toolbar displayed in debugging mode allows you to control the flow of the application during debugging (see following figure).

Buttons are available to continue, step over, step in, and step out.

You can also restart the debugging session via the toolbar if you have made changes to the code.

To stop the debugging session, click on the red square button in the toolbar.

Watch the video to see how to debug a custom event handler.