3385703 - Web Container service is currently unavailable on NWA !

503 service unavailable Error on /nwa page and following Error can be seen:

In Default traces you will be able to see:

Error#com.sap.engine.core.service630.container.ServiceRunner#
com.sap.ASJ.krn_srv.000059#BC-JAS-WEB#sap.com/servlet_jsp#C0000A2D7C2E00060000000F000028BF#13862250000002246##com.sap.engine.core.service630.container.ServiceRunner####0F9D0C805D2511EE8052000000D3856A#0f9d0c805d2511ee8052000000d3856a##0#Services Start Processor#Plain##
Service [servlet_jsp] failed to start; contact the component owner for resolving the problem#

#Error#com.sap.engine.core.service630.container.ServiceRunner#
com.sap.ASJ.krn_srv.000071#BC-JAS-WEB#sap.com/servlet_jsp#C0000A2D7C2E000600000010000028BF#13862250000002246##com.sap.engine.core.service630.container.ServiceRunner####0F9D0C805D2511EE8052000000D3856A#0f9d0c805d2511ee8052000000d3856a##0#Services Start Processor#Plain##
Service [servlet_jsp] failed to start; Reason: [Error in execution of service's start method]; nested exception is: 
[EXCEPTION]
com.sap.engine.frame.ServiceException: java/util/InstanaPluginV6
    at com.sap.engine.services.servlets_jsp.server.ServletsAndJspServerFrame.start(ServletsAndJspServerFrame.java:280)
    at com.sap.engine.core.service630.container.ServiceRunner.startFrame(ServiceRunner.java:165)
    at com.sap.engine.core.service630.container.ServiceRunner.startService(ServiceRunner.java:118)
    at com.sap.engine.core.service630.container.ServiceRunner.startSingleService(ServiceRunner.java:83)
    at com.sap.engine.core.service630.container.MemoryContainer.startServiceRuntime(MemoryContainer.java:847)
    at com.sap.engine.core.service630.container.MemoryContainer.startServiceRuntime(MemoryContainer.java:822)
    at com.sap.engine.core.service630.container.SystemThreadProcessor.run(SystemThreadProcessor.java:87)
    at com.sap.engine.frame.core.thread.Task.run(Task.java:73)
    at com.sap.engine.core.thread.impl5.SingleThread.execute(SingleThread.java:178)
    at com.sap.engine.core.thread.impl5.SingleThread.run(SingleThread.java:316)
Caused by: java.lang.NoClassDefFoundError: java/util/InstanaPluginV6
    at com.sap.engine.services.servlets_jsp.server.ServiceContext.<init>(ServiceContext.java:199)
    at com.sap.engine.services.servlets_jsp.server.ServletsAndJspServerFrame.initServiceContext(ServletsAndJspServerFrame.java:639)
    at com.sap.engine.services.servlets_jsp.server.ServletsAndJspServerFrame.start(ServletsAndJspServerFrame.java:114)
    ... 9 more
Caused by: java.lang.ClassNotFoundException: java.util.InstanaPluginV6
------------------------- Loader Info -------------------------
ClassLoader name: [library:servlet]
Loader hash code: 7f277cf6
 Living status: alive
 Direct parent loaders:
   [system:Frame]
 Resources:
   /usr/sap/D43/J01/j2ee/cluster/bin/ext/servlet/lib/servlet.jar
---------------------------------------------------------------
    at com.sap.engine.boot.loader.MultiParentClassLoader.loadClass(MultiParentClassLoader.java:280)
    at com.sap.engine.boot.loader.MultiParentClassLoader.loadClass(MultiParentClassLoader.java:249)
    ... 12 more

NW AS JAVA 7.1+

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