[chuckaude]

This pull request was automatically generated by Polaris to remediate a security issue.

The suggested fix is created by AI. Review the proposed changes carefully - AI-generated results should not be relied upon for any specific purpose without verifying their accuracy and completeness.

Issue

• Severity: HIGH
• CWE: CWE-404 (Improper Resource Shutdown or Release)
• File: src/main/java/SqlInjection.java

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Issue summary

CWE-404: Leak of a system resource due to improper release after use.
Can exhaust handles, memory, or connections, degrading performance or causing failure.

Code analysis

• Purpose: Executes a database lookup for a user’s account_balance using customerName from an HTTP request.
• Flow: Reads customerName via request.getParameter, concatenates it into a SQL SELECT, creates a Statement, runs executeQuery, and returns the ResultSet.
• Significance: Demonstrates servlet-to-database data retrieval with JDBC.
• Capability analysis: Can fetch balances dynamically per request, but only supports raw string-built queries.
• Actionable insight: This code is SQL injection–vulnerable and should use PreparedStatement, parameter binding, input validation, and proper resource cleanup (try-with-resources).

Fix summary

What changed

The method now executes the query inside a try-with-resources block so the Statement and JDBC ResultSet are closed automatically. It also copies the query results into a CachedRowSet and returns that detached object instead of returning the live JDBC ResultSet.

Why

This prevents a resource leak by ensuring database resources are released even if an exception occurs. Returning a disconnected CachedRowSet preserves the method’s ability to return query data without keeping the underlying JDBC resources open.

Caveats

This only addresses the resource leak; the SQL query is still built via string concatenation and remains vulnerable to SQL injection. Verify callers can work with a CachedRowSet returned as a ResultSet, and ensure the additional rowset dependency is available in the runtime environment.

Confidence

High

Automated review flagged the following items to verify before merging:

• The method previously returned a live, cursor-backed ResultSet tied to the open Statement; it now returns a disconnected in-memory CachedRowSet. Callers that relied on streaming large result sets or lazy cursor behavior may see different memory or performance characteristics, though this is an inherent trade-off when fixing the resource leak by closing the Statement before returning.