logging - Exception while attempting to add an entry to the access log -

tomcat 7 can't write access log , throws following exception.

nov 17, 2016 5:10:37 pm org.apache.catalina.connector.coyoteadapter log warning: exception while attempting add entry access log java.lang.nullpointerexception         @ org.apache.catalina.connector.coyoteadapter.log(coyoteadapter.java:555)         @ org.apache.coyote.ajp.ajpprocessor.process(ajpprocessor.java:182)         @ org.apache.coyote.abstractprotocol$abstractconnectionhandler.process(abstractprotocol.java:611)         @ org.apache.tomcat.util.net.jioendpoint$socketprocessor.run(jioendpoint.java:314)         @ java.util.concurrent.threadpoolexecutor.runworker(threadpoolexecutor.java:1145)         @ java.util.concurrent.threadpoolexecutor$worker.run(threadpoolexecutor.java:615)         @ org.apache.tomcat.util.threads.taskthread$wrappingrunnable.run(taskthread.java:61)         @ java.lang.thread.run(thread.java:745) 

how fix this?

this known issue in tomcat fixed in tomcat 8.0.29. upgrading tomcat should resolve problem. https://bz.apache.org/bugzilla/show_bug.cgi?id=58578

other way modify access logging pattern not include cookie. use this:

pattern="%t %h request:%{sessionid}r %m %u %s %q %r" 

instead of

pattern="%t %h cookie:%{sessionid}c request:%{sessionid}r %m %u %s %q %r" 

in server.xml.

    <!-- access log processes example.          documentation at: /docs/config/valve.html          note: pattern used equivalent using pattern="common" -->     <valve classname="org.apache.catalina.valves.accesslogvalve" directory="logs"            prefix="localhost_access_log" suffix=".txt"            pattern="%h %l %u %t &quot;%r&quot; %s %b" />    </host> </engine>