Accumulo has some static resources that can cause problems for web applications. You could try calling CleanUp.shutdownNow() [1] before the container unloads the web app.
[1]: https://github.com/apache/accumulo/blob/rel/1.7.2/core/src/main/java/org/apache/accumulo/core/util/CleanUp.java#L36 On Tue, Feb 7, 2017 at 9:39 AM, Cyrille Savelief <[email protected]> wrote: > Hi, > > > > Since a few weeks, we are having the following recurring warnings (tens of > megabytes) : > > > > 02-07-2017 15:17:39 - WARN - org.apache.zookeeper.ClientCnxn run - Session > 0x159d0669ef70043 for server 10.91.176.82/10.91.176.82:2181, unexpected > error, closing socket connection and attempting reconnect > > java.lang.IllegalStateException: Can't overwrite cause with > java.lang.IllegalStateException: Illegal access: this web application > instance has been stopped already. Could not load > org.apache.zookeeper.proto.SetWatches. The eventual following stack trace > is caused by an error thrown for debugging purposes as well as to attempt to > terminate the thread which caused the illegal access, and has no functional > impact. > > at java.lang.Throwable.initCause(Throwable.java:457) > > at > org.apache.catalina.loader.WebappClassLoaderBase.checkStateForClassLoading(WebappClassLoaderBase.java:1305) > > at > org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1185) > > at > org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1146) > > at > org.apache.zookeeper.ClientCnxn$SendThread.primeConnection(ClientCnxn.java:926) > > at > org.apache.zookeeper.ClientCnxnSocketNIO.doTransport(ClientCnxnSocketNIO.java:363) > > at > org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1141) > > Caused by: java.lang.ClassNotFoundException > > at > org.apache.catalina.loader.WebappClassLoaderBase.checkStateForClassLoading(WebappClassLoaderBase.java:1304) > > ... 5 more > > > > Apart from this warning, we have no other errors in the log and everything > is running fine. Do you have any idea where it might come from ? > > > > Best, > > > > Cyrille SAVELIEF > > ��Z7�>� 4��
