Скачать или смотреть Resolving WAS gets hung WSVR0605W due to JDBC PreparedStatement Execution Errors in WebSphere

Discover how to fix the `WAS gets hung WSVR0605W` error caused by JDBC prepared statement execution in WebSphere Application Server.
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This video is based on the question https://stackoverflow.com/q/63137350/ asked by the user 'Shiva' ( https://stackoverflow.com/u/4853912/ ) and on the answer https://stackoverflow.com/a/63167941/ provided by the user 'Shiva' ( https://stackoverflow.com/u/4853912/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Understanding the Problem: WAS gets hung WSVR0605W

If you're working with JDBC and WebSphere Application Server (WAS), you may have encountered the frustrating WSVR0605W warning, indicating a thread is hung for too long during batch processing of JDBC prepared statements. Not only does this halt the execution of your application, but it can lead to potential data integrity issues because the expected database transactions never get executed.

This problem typically arises when you're manipulating records across multiple tables through batch inserts. So, what can you do to avoid these security and performance issues in your application?

Identifying the Significance of the Problem

In the scenario presented, the user was trying to execute three prepared statements for inserting data into three separate tables. The process worked smoothly on a local environment but ran into trouble in a test environment where it caused the application to hang. Analyzing the logs, the following warning was evident:

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This warning indicates that the application thread is stuck, waiting for a response, which often points to network or driver-related issues, particularly when dealing with batch statements in JDBC.

Solution: Use Connection Pooling Instead of Direct Connection

To resolve the issue, a key step that was taken involved switching from creating a direct database connection to leveraging a connection pool. Here’s a breakdown of the solution:

Why Use a Connection Pool?

Efficiency: Connection pools manage a pool of connections, reducing the overhead of repeatedly opening and closing connections.

Performance: It allows for better resource management, which is crucial in environments with high traffic and increased load.

Stability: Connection pools typically handle connections more effectively, which reduces the likelihood of running into hangs and locks.

Implementation Steps

Obtain the Data Source: Use the existing data source to retrieve a connection instead of manually establishing a new one.

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Modify Your Existing Code: Replace your existing connection logic with the new approach in your regPoints method. Ensure that all calls use the obtained dbConn instance.

Review Batch Executions: Since WebSphere Commerce (WCS) may not permit batch executing prepared statements through a standard JDBC access bean, using the DataSource from BaseJDBCHelper ensures the operations are handled properly by the server.

Logging for Debugging: Maintain your logging practices to catch any similar issues that may arise. Logging how many rows get processed in each table can provide insights about possible bottlenecks.

Conclusion

By implementing a connection pool and leveraging the BaseJDBCHelper to retrieve connections, you can enhance the stability of database operations and prevent the application from hanging during prepared statement executions. Moving away from manual connections not only optimizes resource use but significantly enhances application performance.



By understanding the importance of effective database management and utilizing a structured approach to resolve WAS gets hung WSVR0605W errors, you can ensure smoother application operation and maintain data integrity.