I am using Tomcat 8.5.9, i am calling below url to get jmx statistics from Tomcat.
http://10.10.24.10:60080/manager/jmxproxy?qry=*%3Atype%3DDataSource%2C* It gives me output on browser, but at the same time it also shows traces in catalina.out log 11-May-2017 14:51:58.935 SEVERE [http-nio-60080-exec-7] org.apache.catalina.mbeans.MBeanDumper.dumpBeans Error getting attribute Catalina:type=DataSource,host=localhost,context=/,class=javax.sql.DataSource,name="jdbc/mydb",connectionpool=connections,connection=2 Schema javax.management.RuntimeErrorException: java.lang.StackOverflowError at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.rethrow(DefaultMBeanServerInterceptor.java:841) at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.rethrowMaybeMBeanException(DefaultMBeanServerInterceptor.java:852) at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.getAttribute(DefaultMBeanServerInterceptor.java:651) at com.sun.jmx.mbeanserver.JmxMBeanServer.getAttribute(JmxMBeanServer.java:678) at org.apache.catalina.mbeans.MBeanDumper.dumpBeans(MBeanDumper.java:84) at org.apache.catalina.manager.JMXProxyServlet.listBeans(JMXProxyServlet.java:185) at org.apache.catalina.manager.JMXProxyServlet.doGet(JMXProxyServlet.java:121) at javax.servlet.http.HttpServlet.service(HttpServlet.java:622) at javax.servlet.http.HttpServlet.service(HttpServlet.java:729) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:230) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165) at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165) at org.apache.catalina.filters.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:108) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:591) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140) at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:624) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:349) at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:783) at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66) at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:789) at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1437) at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at java.lang.Thread.run(Thread.java:745)Caused by: java.lang.StackOverflowError at java.lang.String.valueOf(String.java:2849) at java.util.Arrays.toString(Arrays.java:3565) at org.apache.tomcat.dbcp.pool2.impl.BaseGenericObjectPool$StatsStore.toString(BaseGenericObjectPool.java:1118) at java.lang.String.valueOf(String.java:2849) at java.lang.StringBuilder.append(StringBuilder.java:128) at org.apache.tomcat.dbcp.pool2.impl.BaseGenericObjectPool.toStringAppendFields(BaseGenericObjectPool.java:1288) at org.apache.tomcat.dbcp.pool2.impl.GenericKeyedObjectPool.toStringAppendFields(GenericKeyedObjectPool.java:1589) at org.apache.tomcat.dbcp.pool2.BaseObject.toString(BaseObject.java:31) at org.apache.tomcat.dbcp.dbcp2.PoolingConnection.toString(PoolingConnection.java:424) at java.lang.String.valueOf(String.java:2849) at java.lang.StringBuilder.append(StringBuilder.java:128) at org.apache.tomcat.dbcp.pool2.impl.GenericKeyedObjectPool.toStringAppendFields(GenericKeyedObjectPool.java:1597) at org.apache.tomcat.dbcp.pool2.BaseObject.toString(BaseObject.java:31) at org.apache.tomcat.dbcp.dbcp2.PoolingConnection.toString(PoolingConnection.java:424) . . . . at java.lang.String.valueOf(String.java:2849) at java.lang.StringBuilder.append(StringBuilder.java:128) at org.apache.tomcat.dbcp.pool2.impl.GenericKeyedObjectPool.toStringAppendFields(GenericKeyedObjectPool.java:1597) at org.apache.tomcat.dbcp.pool2.BaseObject.toString(BaseObject.java:31) at org.apache.tomcat.dbcp.dbcp2.PoolingConnection.toString(PoolingConnection.java:424) I am using Tomcat 8.5.9, i am calling below url to get jmx statistics from Tomcat. http://10.10.24.10:60080/manager/jmxproxy?qry=*%3Atype%3DDataSource%2C* It gives me output on browser, but at the same time it also shows traces in catalina.out log 11-May-2017 14:51:58.935 SEVERE [http-nio-60080-exec-7] org.apache.catalina.mbeans.MBeanDumper.dumpBeans Error getting attribute Catalina:type=DataSource,host=localhost,context=/,class=javax.sql.DataSource,name="jdbc/mydb",connectionpool=connections,connection=2 Schema javax.management.RuntimeErrorException: java.lang.StackOverflowError at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.rethrow(DefaultMBeanServerInterceptor.java:841) at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.rethrowMaybeMBeanException(DefaultMBeanServerInterceptor.java:852) at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.getAttribute(DefaultMBeanServerInterceptor.java:651) at com.sun.jmx.mbeanserver.JmxMBeanServer.getAttribute(JmxMBeanServer.java:678) at org.apache.catalina.mbeans.MBeanDumper.dumpBeans(MBeanDumper.java:84) at org.apache.catalina.manager.JMXProxyServlet.listBeans(JMXProxyServlet.java:185) at org.apache.catalina.manager.JMXProxyServlet.doGet(JMXProxyServlet.java:121) at javax.servlet.http.HttpServlet.service(HttpServlet.java:622) at javax.servlet.http.HttpServlet.service(HttpServlet.java:729) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:230) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165) at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165) at org.apache.catalina.filters.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:108) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:591) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140) at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:624) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:349) at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:783) at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66) at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:789) at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1437) at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at java.lang.Thread.run(Thread.java:745)Caused by: java.lang.StackOverflowError at java.lang.String.valueOf(String.java:2849) at java.util.Arrays.toString(Arrays.java:3565) at org.apache.tomcat.dbcp.pool2.impl.BaseGenericObjectPool$StatsStore.toString(BaseGenericObjectPool.java:1118) at java.lang.String.valueOf(String.java:2849) at java.lang.StringBuilder.append(StringBuilder.java:128) at org.apache.tomcat.dbcp.pool2.impl.BaseGenericObjectPool.toStringAppendFields(BaseGenericObjectPool.java:1288) at org.apache.tomcat.dbcp.pool2.impl.GenericKeyedObjectPool.toStringAppendFields(GenericKeyedObjectPool.java:1589) at org.apache.tomcat.dbcp.pool2.BaseObject.toString(BaseObject.java:31) at org.apache.tomcat.dbcp.dbcp2.PoolingConnection.toString(PoolingConnection.java:424) at java.lang.String.valueOf(String.java:2849) at java.lang.StringBuilder.append(StringBuilder.java:128) at org.apache.tomcat.dbcp.pool2.impl.GenericKeyedObjectPool.toStringAppendFields(GenericKeyedObjectPool.java:1597) at org.apache.tomcat.dbcp.pool2.BaseObject.toString(BaseObject.java:31) at org.apache.tomcat.dbcp.dbcp2.PoolingConnection.toString(PoolingConnection.java:424) . . . . at java.lang.String.valueOf(String.java:2849) at java.lang.StringBuilder.append(StringBuilder.java:128) at org.apache.tomcat.dbcp.pool2.impl.GenericKeyedObjectPool.toStringAppendFields(GenericKeyedObjectPool.java:1597) at org.apache.tomcat.dbcp.pool2.BaseObject.toString(BaseObject.java:31) at org.apache.tomcat.dbcp.dbcp2.PoolingConnection.toString(PoolingConnection.java:424) Same traces while fetching for for diff. Attribute as below, 11-May-2017 14:51:59.209 SEVERE [http-nio-60080-exec-7] org.apache.catalina.mbeans.MBeanDumper.dumpBeans Error getting attribute Catalina:type=DataSource,host=localhost,context=/,class=javax.sql.DataSource,name="jdbc/mydb",connectionpool=connections,connection=2 AutoCommit 11-May-2017 14:51:59.477 SEVERE [http-nio-60080-exec-7] org.apache.catalina.mbeans.MBeanDumper.dumpBeans Error getting attribute Catalina:type=DataSource,host=localhost,context=/,class=javax.sql.DataSource,name="jdbc/mydb",connectionpool=connections,connection=2 Catalog 11-May-2017 14:51:59.757 SEVERE [http-nio-60080-exec-7] org.apache.catalina.mbeans.MBeanDumper.dumpBeans Error getting attribute Catalina:type=DataSource,host=localhost,context=/,class=javax.sql.DataSource,name="jdbc/mydb",connectionpool=connections,connection=2 Holdability 11-May-2017 14:52:00.023 SEVERE [http-nio-60080-exec-7] org.apache.catalina.mbeans.MBeanDumper.dumpBeans Error getting attribute Catalina:type=DataSource,host=localhost,context=/,class=javax.sql.DataSource,name="jdbc/mydb",connectionpool=connections,connection=2 TransactionIsolation 11-May-2017 14:52:00.285 SEVERE [http-nio-60080-exec-7] org.apache.catalina.mbeans.MBeanDumper.dumpBeans Error getting attribute Catalina:type=DataSource,host=localhost,context=/,class=javax.sql.DataSource,name="jdbc/mydb",connectionpool=connections,connection=2 ReadOnly Also in browser output of type=DataSource i got below output, Name: Catalina:type=DataSource,host=localhost,context=/,class=javax.sql.DataSource,name="jdbc/mydba",connectionpool=connections,connection=1,statementpool=statements modelerType: org.apache.tomcat.dbcp.pool2.impl.GenericKeyedObjectPoolDestroyedByEvictorCount: 0DestroyedByBorrowValidationCount: 0MeanActiveTimeMillis: 1MeanIdleTimeMillis: 6052MeanBorrowWaitTimeMillis: 0MaxBorrowWaitTimeMillis: 1CreationStackTrace: java.lang.Exception\n at org.apache.tomcat.dbcp.pool2.impl.BaseGenericObjectPool.<init>(BaseGeneric ObjectPool.java:139)\n at org.apache.tomcat.dbcp.pool2.impl.GenericKeyedObjectPool.<init>(GenericKey edObjectPool.java:100)\n at org.apache.tomcat.dbcp.dbcp2.PoolableConnectionFactory.makeObject(Poolable ConnectionFactory.java:293)\n at org.apache.tomcat.dbcp.pool2.impl.GenericObjectPool.create(GenericObjectPo ol.java:888)\n at org.apache.tomcat.dbcp.pool2.impl.GenericObjectPool.borrowObject(GenericOb jectPool.java:430)\n at org.apache.tomcat.dbcp.pool2.impl.GenericObjectPool.borrowObject(GenericOb jectPool.java:359)\n at org.apache.tomcat.dbcp.dbcp2.PoolingDataSource.getConnection(PoolingDataSo urce.java:134)\n at org.apache.tomcat.dbcp.dbcp2.BasicDataSource.getConnection(BasicDataSource .java:1543)\n at com.mycompany.core.datasource.JNDIDSManager.initJ NDIDataSource(JNDIDSManager.java:47)\n At this line JNDIDSManager.java:47 i have code which will get connection from datasource. What "CreationStackTrace" attribute means and when it occurs? -- *Ajay Patel*