Symptom-based JMeter error playbooks: ConnectException, SSL handshake, OutOfMemoryError, connection reset, stuck throughput, GUI vs CLI, and 401 after record.
JMeter Error Playbooks
Section titled “JMeter Error Playbooks”Dedicated pages for the failures people actually search for. Each playbook follows the same structure:
- Symptom - what you see in View Results Tree, the JTL, or
jmeter.log - Common causes - grounded in JMeter behaviour and load-test ops
- Fix - ordered checks that usually resolve the issue
- Related tools and topics - calculators and deeper guides on this site
Use these for quick triage; use the full troubleshooting guide for the broader decision tree.
Connection and TLS
Section titled “Connection and TLS”| Error | Open playbook |
|---|---|
java.net.ConnectException | ConnectException |
Non HTTP response code / non-HTTP response message | Non HTTP response code |
SSLHandshakeException / PKIX path building failed | SSLHandshakeException |
| Socket closed / connection reset | Socket closed / connection reset |
Capacity and results
Section titled “Capacity and results”| Error | Open playbook |
|---|---|
OutOfMemoryError: Java heap space | OutOfMemoryError heap |
| Throughput stuck / not reaching target RPS | Throughput stuck |
Auth and environment
Section titled “Auth and environment”| Error | Open playbook |
|---|---|
| Script works in GUI, fails in CLI | GUI works, CLI fails |
| 401 / 403 after recording | 401/403 after recording |
How to read sample errors
Section titled “How to read sample errors”- View Results Tree (debug only): response code, message, request body
jmeter.log/-jlog file: startup, SSL, class, and plugin issues- HTML dashboard (generating dashboard): error % and top errors by sampler after a CLI run
- Glossary (metrics): elapsed, latency, connect time, throughput
Related
Section titled “Related”- Troubleshooting overview
- Best practices
- Interview questions (common verbal prompts map here)
People Also Ask
What are JMeter error playbooks?
Short symptom-based guides for common JMeter failures such as ConnectException, SSL handshake errors, OutOfMemoryError, stuck throughput, GUI versus CLI failures, and 401 after recording. Each page covers symptom, causes, fix order, and related tools.
Should I use the error playbooks or the full troubleshooting guide?
Use an error playbook when you already know the exception or symptom. Use the full troubleshooting guide for the end-to-end triage tree from one thread to full load.
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