Public bug reported:
Running Tomcat7 on Ubuntu 16.04 with Java7 gives an exception when
deploying apps.
Error: SEVERE: Context initialization failed
java.lang.NoSuchMethodError:
java.util.concurrent.ConcurrentHashMap.keySet()Ljava/util/concurrent/ConcurrentHashMap$KeySetView;
at
org.apache.catalina.core.ApplicationContext.getInitParameterNames(ApplicationContext.java:368)
Bug report: https://bz.apache.org/bugzilla/show_bug.cgi?id=4
Description and possible solution:
http://stackoverflow.com/questions/38583495/getting-error-while-running-
webservices-on-tomcat7-server-ubuntu-16-04-lts
It seems on the Apache builds this is not happening and it is an issue
with the Ubuntu packages for 16.04
The docs say that Tomcat7 should work on Java7, and event with Java6:
http://tomcat.apache.org/whichversion.html
The current build for Ubuntu 16.04 doesn't comply with that. The error
happened to tens of people already, and maybe more (by looking at the
google results).
** Affects: tomcat7 (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1650853
Title:
tomcat7 was built with Java8 for Ubuntu 16.04 and it should be
compatible with Java7
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