Backoffice fails rendering explorer tree

[Former Member]

Hi all,

Yesterday all of a sudden our explorer tree from backoffice failed rendering. I do see errors in the logs about the failure of the rendering but I don't see anything that I can relate as a cause. The errors about the rendering are as follows:

INFO | jvm 3 | srvmain | 2019/04/17 19:11:41.640 | WARN [hybrisHTTP106] [85.17.247.106] [DefaultAbstractCollectorChartHandler] Could not find series values INFO | jvm 3 | srvmain | 2019/04/17 19:11:42.404 | ERROR [hybrisHTTP30] [85.17.247.106] [Configuration] Failed to invoke class com.hybris.cockpitng.util.CockpitComponentCleanup INFO | jvm 3 | srvmain | 2019/04/17 19:11:42.404 | java.util.ConcurrentModificationException: null INFO | jvm 3 | srvmain | 2019/04/17 19:11:42.404 | at java.util.HashMap$Values.forEach(HashMap.java:984) ~[?:1.8.0_192]

INFO | jvm 3 | srvmain | 2019/04/17 19:11:42.404 | WARN [Thread-15617] [LongOperation] Cannot finish background operation, probably page was reloaded during operation INFO | jvm 3 | srvmain | 2019/04/17 19:11:42.404 | WARN [Thread-15618] [LongOperation] Cannot finish background operation, probably page was reloaded during operation INFO | jvm 3 | srvmain | 2019/04/17 19:11:42.404 | ERROR [hybrisHTTP106] [85.17.247.106] [ListContainerRenderer] Error while trying to render widgetchildren for widget 'mainSlot'. Reason: INFO | jvm 3 | srvmain | 2019/04/17 19:11:42.404 | java.lang.NullPointerException: null

INFO | jvm 3 | srvmain | 2019/04/17 19:11:42.404 | Apr 17, 2019 7:11:42 PM org.apache.catalina.core.StandardWrapperValve invoke INFO | jvm 3 | srvmain | 2019/04/17 19:11:42.404 | SEVERE: Servlet.service() for servlet [zkLoader] in context with path [/backoffice] threw exception INFO | jvm 3 | srvmain | 2019/04/17 19:11:42.404 | java.lang.NullPointerException INFO | jvm 3 | srvmain | 2019/04/17 19:11:42.404 | INFO | jvm 3 | srvmain | 2019/04/17 19:11:42.950 | WARN [hybrisHTTP30] [85.17.247.106] [DefaultAbstractCollectorChartHandler] Could not find series values INFO | jvm 3 | srvmain | 2019/04/17 19:11:44.340 | WARN [hybrisHTTP30] [85.17.247.106] [DataType] Qualifier [unit] not found. Case insenitive resolution have found matching qualifier [Unit] INFO | jvm 3 | srvmain | 2019/04/17 19:11:46.482 | WARN [hybrisHTTP98] [85.17.247.106] [DefaultAbstractCollectorChartHandler] Could not find series values

Does anyone have experienced this before as well? Or does anyone knows a cause of this rendering issue?

Kind regards,

[saood]

You are getting ConcurrentModificationException in default class. Means a list is modifying concurrently. As it is in default class so as per my observation, Due to improper handling, sometime it is happening when we have expecting a single value in the list but more than one is there. . If not try to reconfigure the backoffice by pressing f4. reset all.