[JCS-197] Getting an issue with commons-jcs-core 2.0 version, which is InstanceAlreadyExistsException

• Type: Bug
• Status: Closed
• Priority: Critical
• Resolution: Duplicate
• Affects Version/s: jcs-2.0
• Fix Version/s: jcs-3.0
• Component/s: Composite Cache, Documentation
• Labels: performance
• Environment: windows 10
• Flags: Patch, Important
• Assignee: Thomas Vandahl
• Reporter: naga kumar
• Created: 05/Jan/19 04:39
• Updated: 21/Aug/20 13:19
• Resolved: 15/May/19 10:55

Description

Hi,

I have recently tried using JCS 2.0 version. my intention is to improve the performance of my application since my application communicates data base frequently. So, i have implemented a single service on cache, and when i run this service as a standalone(not through web module, but using main method in java), i am able to prove that the call is going to cache for sure for second time since the first call must go to data base. And, finally my issue is, when i deploy the same application, which has cache implementation, and run the web module, i am getting below exception. Can you please solve it as soon as possible since i am dead line. and if possible, can you share a best cache.ccf file for best config. 

 

Exception details

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2019-01-04 16:47:49.426 WARN com.XXXX.XXX.service.agent.XXManagementAgent - Found potential problem class org.apache.commons.jcs.utils.servlet.JCSServletContextListener: implements ServletContextListener
2019-01-04 16:47:49.426 WARN com.XXXX.XXX.service.agent.XXManagementAgent - Found potential problem class org.apache.tomcat.websocket.server.WsContextListener: implements ServletContextListener
2019-01-04 16:47:49.426 WARN com.XXXX.XXX.service.agent.XXManagementAgent - Found potential problem class org.apache.commons.logging.impl.ServletContextCleaner: implements ServletContextListener
2019-01-04 16:47:49.426 WARN com.XXXX.XXX.service.agent.XXManagementAgent - Found potential problem class com.XXXX.otag.service.agent.ServiceBootstrapListener: implements ServletContextListener

 

org.apache.commons.jcs.engine.control.CompositeCacheManager - Could not register JMX bean.
javax.management.InstanceAlreadyExistsException: org.apache.commons.jcs:type=JCSAdminBean
at com.sun.jmx.mbeanserver.Repository.addMBean(Repository.java:437)
at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerWithRepository(DefaultMBeanServerInterceptor.java:1898)
at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerDynamicMBean(DefaultMBeanServerInterceptor.java:966)
at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerObject(DefaultMBeanServerInterceptor.java:900)
at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerMBean(DefaultMBeanServerInterceptor.java:324)
at com.sun.jmx.mbeanserver.JmxMBeanServer.registerMBean(JmxMBeanServer.java:522)
at org.apache.commons.jcs.engine.control.CompositeCacheManager.initialize(CompositeCacheManager.java:271)
at org.apache.commons.jcs.engine.control.CompositeCacheManager.getInstance(CompositeCacheManager.java:185)
at org.apache.commons.jcs.engine.control.CompositeCacheManager.getInstance(CompositeCacheManager.java:161)
at org.apache.commons.jcs.JCS.getCacheManager(JCS.java:156)
at org.apache.commons.jcs.JCS.getInstance(JCS.java:174)

 

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Note: If you share any solution, please give it us with a sample code.

 

thanks,

Nag