Abap Debugging Basic

SPS102: ABAP DEBUGGING

Kasama RuangrongEMIT|SAS|SPS26-Oct-2007

Based on a Presentation byJohn C Benson(1st Edition) June 06

Mike Bradshaw(2nd) June 06Kylie Sng Yen Leng(3rd) Oct19, 07

Agenda

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1. Debugging Overview

2. Debugging Components

3. Breakpoints

4. Displaying Data Values

5. Changing Data Values

6. Watchpoints

7. ABAP Dump(ST22)

8. Tips & Tricks

1. Debugging Overview (DM1)

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Components

Breakpoint

Watchpoint

DebugData Values

Component

Breakpoint

Data Value Watchpoint

OVERVIEW

1. Debugging Overview (DM1)

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ABAP Program: Y_ABAP_DEBUG_DEMO

or

Transaction: Y_ABAP_DEBUG_DEMO

Selection Screen:

1. Debugging Overview (DM1)

ABAP Debug Screen

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2. Debugging Components (DM1)

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• Basic understanding of the ABAP Debug Components

Components

2. Debugging Components (DM1)

Description Icon Fkey Action

Single Step <F5> go to the next instruction regardless of program level

Execute <F6> go to next instruction in the current program level

Return <F7> return to the calling program level

Continue <F8> continue execution to the next breakpoint or complete processing.

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Execution within the Debugger

2. Debugging Components (DM1)

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Execution Flow within the ABAP Debugger

• Demonstrating the use of within the program execution levels.

• Breakpoint in the program executing the Perform.

• Breakpoint in the Perform.

• Breakpoint in the Function Module

2. Debugging Components (DM1)

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Display Options within the ABAP Debugger

• Display program lines before and after the current line to be executed.

or

• Display the current line to be executed.

• Increase Program Section Size

• Display the current Call or Program Level

2. Debugging Components (DM1)

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Display Options within the ABAP Debugger (cont’d)

• or Reset the ABAP Debug Display.

• Cancel Execution.

3. Breakpoints (DM3)

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• Setting Breakpoints

Breakpoint

3. Breakpoints (DM3)

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Start the ABAP Debugger Before Start of Execution

• Enter “/h” in the Command Line:

or

Menu Path: System>Utilities>Debug ABAP

Bottom of the Screen:

• SE38>Select the Debug ICON:

3. Breakpoints (DM3)

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Breakpoints

• Initial Breakpoints are set using SE38/SE39 or SE37.

With the line highlighted click the on the toolbar to set the breakpoint.

Click again to delete

3. Breakpoints (DM3)

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Breakpoints (cont’d)

• The complete list of breakpoints can be displayed/deleted in SE38 (Utilities>Breakpoint>Display).

3. Breakpoints (DM3)

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Breakpoints (cont’d)

• Breakpoints can be added or deleted during the debug session.

Double click on a line to add or delete a breakpoint.

3. Breakpoints (DM3)

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Breakpoints (cont’d)

• Displaying all breakpoints during a debug session.

Breakpoints can be deleted in the breakpoint list by double clicking .

3. Breakpoints (DM3)

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Breakpoints (cont’d)

• Display a dropdown list to deactivate or reactivate breakpoints for the current execution.

indicates a deactivated breakpoint.

3. Breakpoints (DM3)

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Breakpoints (cont’d)

• Breakpoints added or deleted during a debug session can be saved for subsequent executions.

Initial execution

Subsequent executions after saving the

deletion of the original breakpoint and the setting of a new breakpoint in a

previous debug session.

3. Breakpoints (DM3)

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Breakpoints (cont’d)

• Breakpoints are only active for the user that sets the breakpoints.

• Breakpoints are active for all sessions within a user logon.

• Breakpoints are not active for additional user logons.

4. Displaying Data Values (DM2+DM4)

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• Displaying Data Values in Fields, structure & Internal Tables

• Changing Data Values

Data Values

4. Displaying Data Values (DM2+DM4)

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• Displaying the Output List in the ABAP Debugger

• is added to the execution task bar after output has been created.

• Click on to display the current Output List.

4. Displaying Data Values (DM2+DM4)

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• Displaying Data Values

Standard System Values

4. Displaying Data Values (DM2+DM4)

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Displaying Data Values (cont’d)

• Single Fields

• Type or double click the single field.

• Double click the field to display the field attributes.

4. Displaying Data Values (DM2+DM4)

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Displaying Data Values (cont’d)

• Structures

• Type or double click the structure name.

• Double click the structure name to display the values for each structure field.

• Double click the structure field to display its attributes.

4. Displaying Data Values (DM2+DM4)

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Displaying Data Values (Cont’d)

• Internal Tables

• Type or Double Click the Internal Table Name

• Hit <Enter> to display the internal table contents

Current Values in the Table Header

4. Displaying Data Values (DM2+DM4)

Icon Table Field

First

Previous

Next

Last

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Displaying Data Values (Cont’d)

• Parsing the Internal Table:

• Table Paging:

• Finding a Record:

Icon Page

First

Previous

Next

Last

Icon In Table

Find

Find Next

4. Displaying Data Values (DM2+DM4)

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Displaying Data Values (Cont’d)

• Internal Tables (Cont’d)

• Fields can be excluded from the internal table display. Highlight the fields to be excluded, depress <Delete>, then depress <Enter>.

• To redisplay all fields, click on .

4. Displaying Data Values (DM2+DM4)

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Displaying Data Values (Cont’d)

• Download Internal Tables (Cont’d)

4. Displaying Data Values (DM2+DM4)

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Displaying Data Values (Cont’d)

• Download Internal Tables (Cont’d)

5. Changing Data Values (DM5)

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• Changing Data Values

• Display the fields in the ABAP Debugger

• Overtype the field value and select to make the change to the field value.

5. Changing Data Values (DM5)

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• Changing Data Values (cont’d)

• Display the Internal table in the ABAP Debugger

• To change the Value, place cursor at the column & click “Change”. Press Enter to confirm changes.

5. Changing Data Values (DM5)

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• Changing Data Values (cont’d)

• To insert a new row into the Internal Table. Click on the “Insert”. Press Enter to confirm the changes.

5. Changing Data Values (DM5)

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• Changing Data Values (cont’d)

• To add a new record at the END of the Internal Table. Click on the “Append”. Press Enter to confirm the changes.

5. Changing Data Values (DM5)

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• Changing Data Values (cont’d)

• To remove an record. Place your cursor at that row. Click on “Delete”. Press Enter to confirm the changes.

5. Changing Data Values (DM5)

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• Changing Data Values (cont’d)

• To remove a record, place your cursor at record and click on the “Delete”.

6. Watchpoints (DM6)

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• Setting Watchpoint

Watchpoint

6. Watchpoints (DM6)

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Watchpoints

• Uses an ABAP field to create a conditional breakpoint while in the ABAP Debugger

6. Watchpoints (DM6)

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Watchpoint (Cont’d)

• Displaying and changing the watchpoints that have been set in the ABAP Debugger.

is used to change the watchpoint condition.

is used to delete the watchpoint.

7. ABAP Dump (ST22)

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ABAP DUMP ANALYSIS (ST22)

7. ABAP Dump (ST22)

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ABAP Dump Analysis

• An ABAP Dump occurs when the program intentionally triggers a dump when current conditions cannot be handled.

Examples: Divide by ZeroNumeric field too small for the result (field overflow)Timeout

• Use transaction ST22 to view and analyze an ABAP Dump.

7. ABAP Dump (ST22)

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ABAP Dump Analysis (cont’d)

Summary of What Happened!

Where it Happened!

Click here to View the code

7. ABAP Dump (ST22)

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ABAP Dump Analysis (cont’d)

Contents of System Variables!

Contents of Chosen Variables!

7. ABAP Dump (ST22)

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ABAP Dump Analysis (cont’d)

Where it has been and

where it is!

• The program was at line 197 in the Form “DEMO_07” which was called from line 77 in the Event “Start_of_Selection”.

• IMPORTANT : Please kindly save the short dump into a file and send to SPS for analysis.

8. Tips & Tricks

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Tips & Tricks

8. Tips & Tricks

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To Debug Dialog Screen• Save the below into a .txt on the desktop (can be any name).

[FUNCTION] Command=/H Title=Debugger Type=SystemCommand

8. Tips & Tricks

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To Debug Dialog Screen (cont’d)• Drag and drop the above file onto the Dialog screen.

• Debugging will be activated.

8. Tips & Tricks

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To Debug Background job• Transaction SM37• Function code JDBG

• Transaction SM66 > Debugging

8. Tips & Tricks

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Transaction Codes• AL21 – ABAP Program Analysis

8. Tips & Tricks

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Transaction Codes (cont’d)• SE30 – ABAP Runtime Analysis

Click here for more analysis

8. Tips & Tricks

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Transaction Codes (cont’d)• SE93 – Maintain Transaction (good for finding the program name).

ABAP Debugging Summary

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Potential Pitfalls

• Running code in the debugger is not exactly the same as normal execution.

• The debugger may perform commits which can cause: - Abends the code by breaking the database cursor (Select/Endselect). - Inadvertently commits changes to the database that would otherwise be rolled

back.

• Timing is changed in the debugger: - Problems related to the timing and sequence of database updates may

not show up when in the debugger.

• Restarting without leaving the debugger completely may retain prior information in global memory that would normally be refreshed.

• Record locks are not released within an appropriate timeframe thereby impacting other processing.

• A limited number of processes are available in production so try to avoid extended debug sessions.

• Start a secondary session to be able to terminate a runaway session.

ABAP Debugging Summary

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Summary

• The debugger can be useful to isolate hard to locate problems.

• The debugger changes the environment so some problems are very difficult or impossible to debug.

• Breakpoints and watchpoints help to get to the suspected problem area faster.

• Variables can be changed to create tests and bypass checks, but debug with replace is not normally used or allowed in production.

SPS102: Revisions

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1. Debugging Overview

2. Debugging Components

3. Breakpoints

4. Displaying Data Values

5. Changing Data Values

6. Watchpoints

7. ABAP Dump(ST22)

8. Tips & Tricks