Troubleshooting & Debugging

My JMeter test is crashing with OutOfMemoryError or GC overhead limit exceeded after [N] minutes with [N] VUs.

Diagnose and fix:
- Root causes of JMeter memory issues
- JVM heap tuning: how to set -Xms and -Xmx in jmeter.bat / jmeter.sh
- Listener optimization: which listeners to disable in CI/CD runs
- Results file size management
- How to profile JMeter's own memory with JVisualVM or JMC
- Best configuration for long-running soak tests
- Recommended JVM flags for JMeter at [N] VUs

My JMeter HTTP request is failing with:
[Paste error: Connection refused / 401 / 403 / 500 / SSL handshake / etc.]

Help me debug step by step:
- What each error code means in the context of load testing
- How to enable JMeter HTTP debug logging
- How to compare JMeter request with working browser/Postman request
- SSL/TLS configuration issues and fixes
- Proxy recording debugging tips
- HTTP request header differences to check
- How to use View Results Tree effectively without memory issues

My load test has a [N]% error rate. The errors are:
[Paste error messages from JMeter or describe them]

Provide a systematic RCA:
1. Classify errors: client-side vs server-side vs network
2. Common causes for each error type
3. How to extract error details from JMeter (Response Assertion failure, HTTP status, body)
4. How to correlate errors with server logs
5. How to implement JMeter Error Handling (Error Controller, If Controller)
6. When to fail fast vs continue on error
7. Fix recommendations for the specific errors observed