Encountering the `MQJE001: Completion Code '2', Reason '2035'` error after upgrading your Java client for IBM MQ? This guide breaks down the cause and provides practical steps to resolve the issue.
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Understanding the MQJE001: Completion Code '2', Reason '2035' Error
If you've recently upgraded from the Java client version 6.0.2.2 to 9.3.1.0 for your application using IBM MQ, and now find yourself facing the MQJE001: Completion Code '2', Reason '2035' error, you are not alone. This is a common issue that arises due to changes in how the newer version handles user authentication. In this post, we'll explore the cause of this error and how to resolve it effectively.
The Issue Explained
When you receive the error message stating that the initialization of the User ID has failed, it typically means there is a problem with how the client is authenticating against the queue manager. These errors usually occur because of the following:
User Authentication: The Java application is trying to connect using a username that is not recognized by the queue manager.
MQCSP Block: The User ID is being passed incorrectly or is empty in the MQCSP block, which manages authentication credentials in IBM MQ 7.0 and later.
The key message in the error indicates that the queue manager cannot validate the given User ID, resulting in an inability to perform the intended actions, such as putting messages onto the queue.
Steps to Resolve the Error
To fix the MQJE001: Completion Code '2', Reason '2035' error, you can implement the following solutions:
1. Modifying the User ID Property
If you're experiencing this issue only after upgrading to the latest version of the MQ Java client, you may need to set your Java system property for user.name to an empty value. Implementing this can help revert to the prior behavior of version 6, which did not enforce strict user validation. Here’s how to do it:
On the Command Line:
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In Your Java Program:
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2. Utilizing Valid Credentials
Instead of using a blank User ID, consider the following approaches to enhance security and eliminate errors:
Specify a valid username and password for authentication. Ensure that these credentials have the necessary permissions to perform write operations on the queue.
Use MQ client TLS certificates for enhanced identity assertion. This can be combined with channel security (SSLPEER, MCAUSER) to control access more securely.
3. Checking Channel Authentication (CHLAUTH)
After version 7.1, CHLAUTH (channel authentication) rules were introduced in IBM MQ, which may be preventing your connection based on the User ID being passed. Here's what you need to check:
Ensure that your SVRCONN channel is configured to allow the User ID you are trying to authenticate.
Review the CHLAUTH rules to make sure they are not blocking access for the intended User ID.
Summary
This issue of MQJE001: Completion Code '2', Reason '2035' following a Java client upgrade is primarily related to strict user authentication introduced in later versions. By updating the Java system property for user.name, supplying valid credentials, and checking the CHLAUTH settings on the queue manager, you can resolve this error effectively.
Taking these measures not only helps regain functionality but also enhances the security of your messaging infrastructure. For any further assistance, consider consulting the detailed IBM documentation or reaching out to support.
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