Errors in the stage editor

When using the Java™ Integration stage, you might encounter certain GUI errors.

Symptoms

When you click Configure on the Java Integration stage property editor, you might encounter the following warning message:
```
Failed to instantiate the resource wrapper class
```
When you click Select on the stage property Usage>User class property, you might encounter the following warning message:
```
Failed to send the request to the handler: The agent at HOST123:31531 
is not available.
```

Resolving the problem

Verify that the ASB agent is working and restart the ASB agent if necessary.

The ASB agent log file can help you understand the errors that occur in the stage editor. The file is named asb-agent-xx.out and is in the ASBNode/logs folder if com.ibm.iis.cas.level=ALL is added into the ASBNode/conf/asbagent-logging.properties file.