<Valve className="org.apache.catalina.valves.PersistentValve"/>
<Manager className="org.apache.catalina.session.PersistentManager" saveOnRestart="false"
         maxIdleBackup="10">
  <Store className="org.apache.catalina.session.JDBCStore"
         connectionURL="jdbc:mysql://localhost/tomcat?user=user&password=password"
         driverName="com.mysql.jdbc.Driver"
         sessionAppCol="app_name"
         sessionDataCol="session_data"
         sessionIdCol="session_id"
         sessionLastAccessedCol="last_access"
         sessionMaxInactiveCol="max_inactive"
         sessionTable="tomcat_sessions"
         sessionValidCol="valid_session" />
</Manager>

SEVERE: Exception Processing /static/prelogin/font-awesome/font-awesome.min.css
java.lang.NullPointerException
    at org.apache.catalina.session.StandardSession.doWriteObject(StandardSession.java:1689)
    at org.apache.catalina.session.StandardSession.writeObjectData(StandardSession.java:1107)
    at org.apache.catalina.session.JDBCStore.save(JDBCStore.java:781)
    at org.apache.catalina.valves.PersistentValve.invoke(PersistentValve.java:166)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:141)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
    at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:620)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:502)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1132)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:684)
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1533)
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1489)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    at java.lang.Thread.run(Thread.java:745)

<mvc:resources mapping="/static/**" location="/static/"
        cache-period="0" />