Software⏱️ 2 min read📅 2026-05-31

How to Fix: org.postgresql.util.PSQLException: FATAL: sorry, too many clients already

Exceeding the maximum number of clients allowed in PostgreSQL.

Quick Answer: Check your server.properties file and adjust the MaxConnections parameter to a lower value, e.g. MaxConnections=50.

📋 Table of Contents

  1. ⚠️ Common Causes
  2. ✅ Best Solutions to Fix It
  3. 💡 Conclusion

The 'org.postgresql.util.PSQLException: FATAL: sorry, too many clients already' error indicates that the PostgreSQL server has reached its maximum allowed number of concurrent connections. This can occur due to excessive usage or a misconfigured connection pool.

⚠️ Common Causes

  • Excessive usage of the database, leading to a high number of concurrent connections.

✅ Best Solutions to Fix It

Method 1: Reduce Concurrent Connections

  1. Step 1: Decrease the value of `MaxConnections` in your server.properties file to a more reasonable number, such as 50 or 20.

Method 2: Implement Connection Pooling

  1. Step 1: Adjust the `PoolSize` in your server.properties file to a more suitable value, such as 20 or 10.

💡 Conclusion

By reducing concurrent connections and implementing connection pooling, you can effectively fix the 'org.postgresql.util.PSQLException: FATAL: sorry, too many clients already' error.

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