Meaning of Webview error: " caused by com.wily.isengard.message.MessageUndeliverableException"

Document ID : KB000103086
Last Modified Date : 26/06/2018
Show Technical Document Details
Issue:
The following error appears in the log file IntroscopeWebView.log on the MOM server (V10.5): 

...[ERROR] [WebView.EventPump] 

com.wily.util.exception.UnexpectedExceptionError 
at com.wily.introscope.ui.dataviewer.AAsyncMetricDataDataProviderTracker$TopNDataCallback$1.run(AAsyncMetricDataDataProviderTracker.java:339) 
at com.wily.util.event.EventPump$2.IEventMarkedRunnable_run(EventPump.java:833) 
at com.wily.util.event.EventPump.immediateRun(EventPump.java:198) 
at com.wily.util.event.EventPump.access$7(EventPump.java:194) 
at com.wily.util.event.EventPump$Posting.deliver(EventPump.java:588) 
at com.wily.util.event.EventPump$EventPumpThread.run(EventPump.java:807) 
Caused by: com.wily.isengard.message.MessageUndeliverableException 
at com.wily.isengard.messageprimitives.service.MessageServiceClient.sendRequest(MessageServiceClient.java:173) 
at com.wily.isengard.messageprimitives.service.MessageServiceClient.invoke(MessageServiceClient.java:356) 
at com.sun.proxy.$Proxy49.executeAsyncQuery(Unknown Source) 
at com.wily.introscope.ui.dataviewer.AAsyncMetricDataDataProviderTracker$TopNDataCallback$1.run(AAsyncMetricDataDataProviderTracker.java:335) 
... 5 more 

There are no impacts deceled so far on the product and the connection on the application is fine. 

The closest error referenced on the support site is here: 
https://comm.support.ca.com/kb/meaning-of-webview-error-comwilyutilexception/kb000046483 
however the cause is slightly different: 

caused by: com.wily.introscope.spec.server.beans.session.IllegalSessionException 
While we have this: 
Caused by: com.wily.isengard.message.MessageUndeliverableException 
 
Environment:

APM 10.5

All Platforms

Cause:
The error is mainly linked to slowness in Webview. 
Resolution:
To improve this Webview slowness issue, increase Webview heap size. 
By default lax.nl.java.option.additional (IntroscopeWebview.lax) is set to 
"-Xms128m -Xmx512m -Djava.awt.headless=false -Dsun.java2d.noddraw=true". 
Increase the values -Xms and -Xmx to help prevent the issue. 
 
Additional Information:
There is no lack of functionality and you can safely ignore this error.