How to Handle \"No Operations Allowed After Connection Closed\" Exception in Database Interactions?

No Operations Allowed After Connection Closed Exception

Description:

This exception occurs when an attempt is made to execute an operation after the connection to the database has been closed. The underlying cause is often a connection timeout issue.

Possible Causes:

• Server-side timeouts (e.g., MySQL's wait_timeout)
• Client-side timeouts
• Poor connection pooling configuration

Solution:

Connection Pooling

Ensure that a third-party connection pooling library is used instead of Hibernate's default connection pool, as it is not suited for production environments. Consider using C3P0 or DBCP.

Server-Side Timeout Configuration

Adjust the wait_timeout parameter in MySQL to a higher value to prevent premature connection closures.

Client-Side Timeout Configuration

Increase the maxConnectionAge and maxIdleTime properties of the connection pool to extend connection lifetimes.

Example C3P0 Configuration:

<code class="xml"><property name="connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider</property>
<property name="c3p0.acquire_increment">1</property> 
<property name="c3p0.idle_test_period">100</property> <!-- seconds --> 
<property name="c3p0.max_size">100</property> 
<property name="c3p0.max_statements">0</property> 
<property name="c3p0.min_size">10</property> 
<property name="c3p0.timeout">1800</property> <!-- seconds --> </code>

Additional Note:

The "c3p0.testConnectionOnCheckout=true" property can be set to test connections before being used, but this may impact performance.

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