Troubleshooting Generic Server Hang Issues in WebLogic

A server hang in WebLogic can severely impact application availability, leading to unresponsive services and frustrated users. Unlike a server crash, a server hang occurs when the server appears to be running but does not process requests or responds extremely slowly.

To help administrators effectively diagnose and resolve server hang issues, we’ve prepared a detailed training guide that covers possible causes, troubleshooting techniques, and best practices.

📥 Download the Generic Server Hang Troubleshooting Guide

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Common Causes of Server Hang in WebLogic

1️⃣ Thread Pool Exhaustion

• All available threads are blocked, waiting for resources.
• Excessive long-running requests or slow database queries.

2️⃣ High CPU or Memory Utilization

• Garbage Collection (GC) issues causing long pauses.
• Memory leaks leading to OutOfMemoryError.

3️⃣ Stuck Threads

• A request takes too long, causing WebLogic to mark it as stuck.
• Unoptimized code, deadlocks, or dependency issues.

4️⃣ Database or External System Bottlenecks

• Slow responses from backend services affect server performance.
• JDBC connection pool exhaustion.

5️⃣ Incorrect WebLogic Configuration

• Misconfigured work managers, timeouts, or thread constraints.

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How to Investigate WebLogic Server Hangs

🔹 Check Active Threads Using WebLogic Console

• Navigate to Servers > Monitoring > Threads and check for stuck or hogging threads.

🔹 Analyze WebLogic Logs

• Review server.log and stdout logs for warnings, errors, or excessive GC activity.

🔹 Generate & Analyze Thread Dumps

• Capture thread dumps using: kill -3 <WebLogic_PID>
• Identify blocked, waiting, or deadlocked threads.

🔹 Monitor JVM Performance

• Use tools like JConsole, JVisualVM, or Java Flight Recorder (JFR).
• Check for high GC pause times or memory leaks.

🔹 Test Database & External Services

• Run test queries to check if the database is responding properly.
• Monitor JDBC connection pool usage in WebLogic.

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Best Practices to Prevent WebLogic Server Hangs

✔ Optimize Thread Pool Configuration

• Set appropriate Work Manager policies to handle high loads.

✔ Tune Garbage Collection (GC) Settings

• Avoid frequent full GC pauses that cause server freezes.

✔ Fix Stuck Threads

• Identify slow-running requests and optimize application logic.

✔ Monitor & Tune JDBC Connection Pools

• Ensure enough database connections are available.

✔ Set Proper Timeouts

• Use timeouts for database queries, web service calls, and transactions to prevent waiting indefinitely.

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Download the Full Guide

For step-by-step troubleshooting techniques, configuration tuning, and real-world debugging examples, download the full training guide here:

📥 Generic Server Hang Troubleshooting Guide

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Final Thoughts

Server hangs in WebLogic can disrupt business-critical applications, but with proactive monitoring, proper tuning, and efficient troubleshooting, you can maintain a stable and responsive server environment.

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