When i try to upgrade image to many device at same time i got error message "Error in Job XML generation" If i update image to devices one by one all goes fine. Any idea what causes that. Also error message "Exception thrown from TreeGenerator class com.cisco.nm.rmeng.swim.ui.helpers.JobDetailsTreeGenerator Exception is java.lang.NullPointerException" appears.
You should look at the swim_debug.log for any more information. This error may be related to a bad device display name, or some other device data that breaks well-formed XML. As for the NullPointerException, the error may be related, but more information may be found in the Tomcat stdout.log under NMSROOT/MDC/tomcat/logs.