IntelliJ IDEA 2018.2 Help

Debug Tool Window

View | Tool Windows | Debug
Alt+5

This tool window becomes available when you start debugging.

It displays the output generated by the debugging session for your application. If you are debugging multiple applications, the output for each application is displayed in a separate tab named after the corresponding run/debug configuration.

For each application, there are the following nested tabs:

Each area has a context menu that allows you to configure its behavior and navigate between tabs.

Each of the tabs and areas can be hidden/restored, or moved to a location of your choice.

Debug toolbar

ItemTooltip and ShortcutDescription
icons actions restart svg Rerun
Ctrl+F5
Click this button to stop the current application and run it again.
icons actions resume svg Debug
F9
When the current application is stopped, click this button to debug it again. When an application is running, this button toggles to icons actions restart svg.
icons actions resume svg Resume Program
F9
When an application is paused, click this button to resume program execution.
icons actions pause svg Pause Program
Ctrl+Pause
Click this button to pause program execution.

Note that the button is not available for Run/Debug Configuration: Node.js, Run/Debug Configuration: Attach to Node.js/Chrome, and Run/Debug Configuration: NodeUnit.

icons actions suspend svg Stop
Ctrl+F2
Click this button to terminate the current process externally by means of the standard shutdown script.
icons debugger viewBreakpoints svg View Breakpoints
Ctrl+Shift+F8
Click this button to open the Breakpoints dialog where you can configure breakpoints behavior.
icons debugger muteBreakpoints svg Mute BreakpointsUse this button to toggle breakpoints status.

When the icons debugger muteBreakpoints svg button is pressed in the toolbar of the Debug tool window, all the breakpoints in a project are muted, and their icons become grey: muted breakpoint.

You can temporarily mute all the breakpoints in a project to execute the program without stopping at breakpoints.

icons actions dump svg Get thread dumpClick this button to open the Dump tab.
icons debugger restoreLayout svg Restore LayoutClick this button to abandon changes to the current layout and return to the default state.
icons general gearPlain svg Show Options MenuClick this button to open the menu with the following options available:
  • Show Values Inline: select this option to enable the Inline Debugging feature that allows viewing the values of variables right next to their usage in the editor.
  • Show Method Return Values: select this option to display the return values of the last executed method.
  • Auto-Variables Mode: select this option if you want IntelliJ IDEA debugger to automatically evaluate certain variables (the variables at breakpoints plus several lines before and after the breakpoint).
  • Sort Values Alphabetically: select this option to sort the values in the Variables pane in the alphabetical order.
  • Unmute Breakpoints on Session Finish: select this option to re-enable all disabled breakpoints after the debugging session has been finished.
icons general pin tab svg Pin Tab Click this button to pin or unpin the current tab. You may need to pin a tab to prevent it from closing automatically when the maximum number of tabs is reached in this window.

Stepping toolbar

ItemTooltip and ShortcutDescription
icons debugger showCurrentFrame svg Show Execution Point
Alt+F10
Click this button to highlight the current execution point in the editor and show the corresponding stack frame in the Frames pane.
icons actions traceOver svg Step Over
F8
Click this button to execute the program until the next line in the current method or file, skipping the methods referenced at the current execution point (if any). If the current line is the last one in the method, execution steps to the line executed right after this method.
icons actions traceInto svg Step Into
F7
Click this button to have the debugger step into the method called at the current execution point.

If stepping into the called method is suppressed through the Stepping page of the Settings dialog box (for example, if it is of a standard Java SDK class or a simple getter), the method will be skipped. Change the settings or use the Force Step Into command.

icons debugger actions force step into svg Force Step Into
Shift+Alt+F7
Click this button to have the debugger step into the method called in the current execution point even if this method is to be skipped.
icons actions stepOut svg Step Out
Shift+F8
Click this button to have the debugger step out of the current method, to the line executed right after it.
icons actions popFrame svg Drop frameInterrupts execution and returns to the initial point of method execution. In the process, it drops the current method frames from the stack.
icons actions runToCursor svg Run to Cursor
Alt+F9

Click this button to resume program execution and pause until the execution point reaches the line at the current cursor location in the editor. No breakpoint is required. Actually, there is a temporary breakpoint set for the current line at the caret, which is removed once program execution is paused. Thus, if the caret is positioned at the line which has already been executed, the program will be just resumed for further execution, because there is no way to roll back to previous breakpoints. This action is especially useful when you have stepped deep into the methods sequence and need to step out of several methods at once.

If there are breakpoints set for the lines that should be executed before bringing you to the specified line, the debugger will pause at the first encountered breakpoint.

icons debugger evaluateExpression svg Evaluate Expression
Alt+F8
Click this button to open the Evaluate Expression dialog.
stream debugger icons stream debugger svg Trace Current Stream Chain Click this icon when the debugger stops before or inside a Stream API calls chain to get a visualization of what happens to each element in each transformation (see Analyze Java Stream operations for details).

Hide/restore toolbar

IconTooltipDescription
icons actions move to button svg HideClick this button located in the upper-right corner of the Debug Console, Watches, Treads, Frames, or Variables pane to hide the corresponding area. When an area is hidden, its icon appears in the upper-right corner of the Debugger.
icons debugger console Restore 'Console' viewClick this button to make the Console area visible. This button becomes available after clicking icons actions move to button svg.
icons debugger frame Restore 'Frames' viewClick this button to make the Frames area visible. This button becomes available after clicking icons actions move to button svg.
icons debugger watches Restore 'Watches' viewClick this button to make the Watches area visible. This button becomes available after clicking icons actions move to button svg.
icons debugger threads svg Restore 'Threads' viewClick this button to make the Threads area visible. This button becomes available after clicking icons actions move to button svg.
icons debugger value Restore 'Variables' viewClick this button to make the Variables area visible. This button becomes available after clicking icons actions move to button svg.
icons debugger overhead Restore 'Overhead' View Click this button to make the Overhead pane visible that lets you quickly detect what causes overhead in a debugging session (see Monitor debugger overhead).

Moving tabs and areas

If you are unhappy with the default layout of the Debug tool window, you can always move the tabs and areas. To to that, just drag a tab or an area to the desired location. The possible target gets highlighted.

ij move debug tab

Drop the tab or area in the highlighted location.

To restore the default layout of tabs and area, click icons debugger restoreLayout svg in the Debug toolbar.

Context menu of a tab

Use the context menu of the Frames / Threads, Variables or Watches areas to configure the behavior of these areas or navigate between tabs.

ItemDescription
HideClick this button to hide the corresponding area
Close OthersClick this button to hide all tabs except for the Console and Debugger tabs.
Focus On StartupIf this option is selected, the selected area gets the focus when you start a debugging session.
Focus On BreakpointIf this option is selected, the selected area gets the focus when a breakpoint is reached.
Select Next Tab / Select Previous Tab
Ctrl+Alt+Right / Ctrl+Alt+Left
Use these options to switch between the Console and the Debugger tabs.
Last modified: 4 September 2018

See Also

Procedures:

Reference: