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CICS GDS ISSUE ERROR - Error Signaling

CICS GDS ISSUE ERROR sends an error signal to the partner system in a General Data Stream (GDS) conversation in CICS APPC environments. It provides a mechanism for error notification and communication of error conditions.

What is CICS GDS ISSUE ERROR?

CICS GDS ISSUE ERROR sends an error signal to the partner system in a GDS conversation, indicating that an error condition has occurred during data processing. It provides a structured way to communicate error information and trigger appropriate error handling procedures.

Command Syntax

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EXEC CICS GDS ISSUE ERROR
    CONVID(conversation-id)
    ERRORCODE(error-code)
    ERRORTEXT(error-text)
    RESP(response-code)
    RESP2(response-code-2)
END-EXEC.

Parameters Explained

CONVID Parameter

Specifies the conversation identifier:

  • Must be obtained from GDS ALLOCATE
  • Identifies the active conversation
  • Required for all GDS operations
  • Must be valid and active

ERRORCODE Parameter

Specifies the error code:

  • Identifies the type of error
  • Used for error classification
  • Helps in error handling
  • Must be a valid error code

ERRORTEXT Parameter

Specifies the error text:

  • Provides error description
  • Contains error details
  • Used for debugging
  • Can be null or empty

Common Error Codes

1. Data Processing Errors

  • DAT001: Data validation error
  • DAT002: Data format error
  • DAT003: Data conversion error
  • DAT004: Data integrity error

2. Business Logic Errors

  • BUS001: Business rule violation
  • BUS002: Authorization failure
  • BUS003: Workflow error
  • BUS004: Process error

3. System Errors

  • SYS001: System resource error
  • SYS002: Database error
  • SYS003: Communication error
  • SYS004: Configuration error

Implementation Example

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WORKING-STORAGE SECTION.
01 WS-CONVERSATION-ID     PIC S9(8) COMP.
01 WS-RESPONSE            PIC S9(8) COMP.
01 WS-RESPONSE2           PIC S9(8) COMP.
01 WS-ERROR-CODE          PIC X(6) VALUE 'DAT001'.
01 WS-ERROR-TEXT          PIC X(50) VALUE 'Data validation failed'.
 
PROCEDURE DIVISION.
    * Process received data
    PERFORM PROCESS-DATA
    
    * Check for processing errors
    IF DATA-PROCESSING-ERROR
        EXEC CICS GDS ISSUE ERROR
            CONVID(WS-CONVERSATION-ID)
            ERRORCODE(WS-ERROR-CODE)
            ERRORTEXT(WS-ERROR-TEXT)
            RESP(WS-RESPONSE)
            RESP2(WS-RESPONSE2)
        END-EXEC.
        
        IF WS-RESPONSE NOT EQUAL DFHRESP(NORMAL)
            EXEC CICS WRITE OPERATOR
                TEXT('GDS ISSUE ERROR failed')
            END-EXEC
        END-IF.
        
        * Error signal sent successfully
    END-IF.

When to Use Error Signaling

1. Data Processing Errors

Use error signaling when:

  • Data validation fails
  • Data format is invalid
  • Data conversion errors occur
  • Data integrity is compromised

2. Business Logic Failures

Use for business errors:

  • Business rule violations
  • Authorization failures
  • Workflow errors
  • Process failures

3. System Resource Issues

Use for system errors:

  • Resource allocation failures
  • Database access errors
  • Communication failures
  • Configuration errors

Error Processing

1. Partner Reception

Partner system receives:

  • Error signal
  • Error code
  • Error description
  • Error context

2. Error Handling

Error handling includes:

  • Error classification
  • Recovery procedures
  • Retry mechanisms
  • Fallback procedures

3. Error Logging

Error logging involves:

  • Error code recording
  • Error text logging
  • Context information
  • Timestamp recording

Common Response Codes

Success Response Codes

  • NORMAL (0): Error signal sent successfully
  • CONVERSATION (4): Error processed

Error Response Codes

  • INVREQ (16): Invalid request
  • NOTFND (20): Conversation not found
  • CONVERSATION (24): Conversation error
  • SYSTEM (28): System error

Best Practices

1. Error Classification

  • Use consistent error codes
  • Provide meaningful error text
  • Classify errors appropriately
  • Document error codes

2. Error Handling

  • Check all response codes
  • Handle error signal failures
  • Implement retry logic
  • Log error conditions

3. Error Recovery

  • Plan recovery procedures
  • Test error scenarios
  • Document recovery steps
  • Monitor error patterns

Explain It Like I'm 5 Years Old

Imagine you're playing a game and something goes wrong:

Sometimes when you're playing a game, something doesn't work the way it should. Maybe your game piece won't move, or the dice won't roll, or you can't find the card you need.

CICS GDS ISSUE ERROR is like telling your friend "Hey, something's wrong with my game!" It's not stopping the game completely, but it's letting them know that there's a problem that needs to be fixed.

Just like you might say "My dice are stuck" or "I can't find my card," the computer tells the other computer "There's a data problem" or "I can't process this information" so they know what went wrong and can help fix it.

Exercises

Exercise 1: Error Signaling

Write a CICS GDS ISSUE ERROR command to signal a data validation error with code 'DAT001' and text 'Invalid data format'.

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EXEC CICS GDS ISSUE ERROR
    CONVID(WS-CONVERSATION-ID)
    ERRORCODE('DAT001')
    ERRORTEXT('Invalid data format')
    RESP(WS-RESPONSE)
END-EXEC.

Exercise 2: Error Classification

Design an error classification system for a data processing application. What error codes would you use for different types of errors?

Answer: Use DAT001-DAT004 for data errors, BUS001-BUS004 for business logic errors, SYS001-SYS004 for system errors, and implement consistent error text and recovery procedures for each category.

Quiz

Question 1

What is the primary purpose of CICS GDS ISSUE ERROR?

Answer: B) To send error signal to partner

Question 2

Which parameter specifies the type of error that occurred?

Answer: B) ERRORCODE

Related Concepts

CICS GDS Commands

General Data Stream commands for APPC communication

CICS Error Handling

Error handling strategies in CICS applications

CICS Recovery Procedures

Recovery mechanisms in CICS environments