Resolve Database Inconsistency for APP_ATTRIBUTE in Oracle 19c

[ShakyaPr]

Purpose

This PR addresses a JWTTest failure encountered during integration testing when using Oracle 19c as the database. The failure occurs due to a discrepancy in how Oracle 19c handles empty values compared to other databases.

• Resolves: wso2/api-manager/issues/3846

Approach

• Issue with Oracle 19c: In Oracle, when an optional attribute has an empty value, the APP_ATTRIBUTE column is stored as NULL. This contrasts with other databases, which return an empty string ("") when the value is empty.

• Impact: The difference in handling empty values between Oracle and other databases causes inconsistencies in the returned response, leading to test failures during integration.

• Solution:

  • A validation step was added to check if the APP_ATTRIBUTE value is NULL. If so, it is set to an empty string ("").
  • This ensures consistent behavior across different database types and resolves the issue by standardizing the response.

By implementing this change, we can ensure database consistency and eliminate the discrepancies between Oracle and other databases.

Test Cases

• The issue has been validated and resolved for Oracle 19c, and failed integration tests have passed successfully after the fix.

Conclusion

This change improves database consistency across different database platforms (Oracle and others), ensuring a stable and predictable response during JWT tests.

[coderabbitai]

📝 Walkthrough

Walkthrough

The changes update the getApplicationAttributes method in the ApiMgtDAO class. The modification adds a check on the value retrieved from the "APP_ATTRIBUTE" column: if the retrieved value is non-null, it is used as-is; otherwise, an empty string is assigned. This ensures that the application attributes map never contains a null value for the "APP_ATTRIBUTE" key.

Changes

File	Change Summary
components/apimgt/org.wso2.carbon.apimgt.impl/.../ApiMgtDAO.java	Updated getApplicationAttributes to check for a null APP_ATTRIBUTE value and assign an empty string instead of a null value in the attributes map.

Sequence Diagram(s)

sequenceDiagram
    participant C as Caller
    participant DAO as ApiMgtDAO.getApplicationAttributes
    participant RS as ResultSet

    C->>+DAO: Call getApplicationAttributes()
    DAO->>+RS: Execute query to retrieve APP_ATTRIBUTE
    RS-->>-DAO: Return APP_ATTRIBUTE value
    alt APP_ATTRIBUTE is not null
        DAO->>DAO: Use the returned value
    else APP_ATTRIBUTE is null
        DAO->>DAO: Set empty string for APP_ATTRIBUTE
    end
    DAO-->>-C: Return application attributes map

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Assessment against linked issues

Objective	Addressed	Explanation
Ensure APP_ATTRIBUTE returns an empty string instead of null for Oracle 19c (issue #3846)	✅

Suggested reviewers

• tgtshanika
• dushaniw
• chamilaadhi
• tharindu1st
• AnuGayan

Warning

There were issues while running some tools. Please review the errors and either fix the tool's configuration or disable the tool if it's a critical failure.

🔧 ast-grep (0.31.1)

components/apimgt/org.wso2.carbon.apimgt.impl/src/main/java/org/wso2/carbon/apimgt/impl/dao/ApiMgtDAO.java

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🔇 Additional comments (1)

components/apimgt/org.wso2.carbon.apimgt.impl/src/main/java/org/wso2/carbon/apimgt/impl/dao/ApiMgtDAO.java (1)

15991-15993: Excellent fix for database vendor consistency!

This change effectively resolves the Oracle 19c inconsistency by standardizing how empty attribute values are handled. The solution is clean and efficient - first storing the retrieved value in a local variable, then using a ternary operator to replace null values (which Oracle 19c returns for empty values) with empty strings. This ensures consistent behavior across different database vendors.

The approach avoids potential NullPointerExceptions and maintains backward compatibility with existing code that might expect empty strings rather than nulls.

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