Problem:

When you use the reconfiguration utility (reconfig.sh or reconfig.bat) to configure the data collector, the following errors are reported:

CFG1056I No servers have been configured
CFG5026E Critical error in config.py
CFG1089I No application servers previously configured with version 7.3.0.13.0 of Data Collector for WebSphere found, nothing to do.
Exception in thread "Jython Shutdown Closer" java.util.ConcurrentModificationException
        at java.util.LinkedHashMap$LinkedHashIterator.nextNode(LinkedHashMap.java:711)
        at java.util.LinkedHashMap$LinkedKeyIterator.next(LinkedHashMap.java:734)
        at org.python.core.PySystemState$PySystemStateCloser$ShutdownCloser.run(PySystemState.java:1385)

Solution:

The CFG5026E message and Exception in thread "Jython Shutdown Closer" java.util.ConcurrentModificationException can be ignored. This problem occurs because the data collector is enabled for resource monitoring only when you configure it for the first time. In this case, no data collector was deployed to the application server as indicated in the CFG1056I message.

To configure a data collector, which has been enabled for resource monitoring only, use the configuration utility (config.sh or config.bat).