Github user gss2002 commented on the issue:
https://github.com/apache/zeppelin/pull/1503
@zjffdu Also those new maps added with ZEPPELIN-1430 those should be
changed to ConcurrentHashMap. Basically any map that is static with
gets/puts/removes etc should be ConcurrentHashMap if not trouble will ensue -
https://dzone.com/articles/java-7-hashmap-vs
https://issues.apache.org/jira/browse/ZEPPELIN-1293 - The code in this
needs to be adjust to check for null also. If json is null create new session
as other errors could occur and cause issues as I saw during debug the last few
days. I will adjust the ZEPPELIN-1546 JIRA to just handle the
NestedRuntimeException.
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