https://issues.apache.org/bugzilla/show_bug.cgi?id=52899
Bug #: 52899
Summary: JMXProxy Servlet MBeanDumper exposing non-properties
causing exceptions/memory leak
Product: Tomcat 7
Version: 7.0.26
Platform: PC
OS/Version: Windows Vista
Status: NEW
Severity: minor
Priority: P2
Component: Manager
AssignedTo: dev@tomcat.apache.org
ReportedBy: hodg...@gmail.com
Classification: Unclassified
Once we upgraded to 7.0.26 we see the following exception in the logs when
viewing the Tomcat JDBC pool properties through the JMXProxy Servlet.
As you can see in the following the data is retrieved correctly but a SEVERE
exception appears in the logs.
http://localhost:8080/manager/jmxproxy/?qry=bean:name=eventingDataSource
OK - Number of results: 1
Name: bean:name=eventingDataSource
modelerType: org.apache.tomcat.jdbc.pool.DataSource
MaxIdle: 100
JdbcInterceptors:
org.apache.tomcat.jdbc.pool.interceptor.ConnectionState;org.apache.tomcat.jdbc.pool.interceptor.StatementFinalizer
DefaultTransactionIsolation: -1
ValidationQuery: SELECT 1 FROM dual
TestOnConnect: false
Password: Password not available as DataSource/JMX operation.
AbandonWhenPercentageFull: 0
TestOnReturn: false
Username: xxxx
NumActive: 0
MinIdle: 10
PoolSize: 4
ValidationInterval: 1800000
Connection:
ProxyConnection[PooledConnection[oracle.jdbc.driver.T4CConnection@17f8b39]]
NumIdle: 2
AccessToUnderlyingConnectionAllowed: true
Url: jdbc:oracle:thin:@(DESCRIPTION =(ADDRESS = (PROTOCOL = TCP)(HOST =
localhost)(PORT = 1580))(CONNECT_DATA =(SERVER = DEDICATED)( SERVICE_NAME =
anywhere.com )(INSTANCE_NAME = xxx)(SID = xxx)))
Size: 4
Active: 2
AlternateUsernameAllowed: false
TestOnBorrow: true
LoginTimeout: 6
MaxActive: 100
MaxAge: 0
SuspectTimeout: 0
Pool: org.apache.tomcat.jdbc.pool.ConnectionPool@9283bf
NumTestsPerEvictionRun: 0
Name: Tomcat Connection Pool[1-6300663]
MaxWait: 6000
PoolProperties: ConnectionPool[defaultAutoCommit=null; defaultReadOnly=null;
defaultTransactionIsolation=-1; defaultCatalog=null;
driverClassName=oracle.jdbc.driver.OracleDriver; maxActive=100; maxIdle=100;
minIdle=10; initialSize=10; maxWait=6000; testOnBorrow=true;
testOnReturn=false; timeBetweenEvictionRunsMillis=30000;
numTestsPerEvictionRun=0; minEvictableIdleTimeMillis=30000;
testWhileIdle=false; testOnConnect=false; password=xxxxx;
url=jdbc:oracle:thin:@(DESCRIPTION =(ADDRESS = (PROTOCOL = TCP)(HOST =
localhost)(PORT = 1580))(CONNECT_DATA =(SERVER = DEDICATED)( SERVICE_NAME =
anywhere.com )(INSTANCE_NAME = xxx)(SID = xxx))); username=xxx;
validationQuery=SELECT 1 FROM dual; validationInterval=1800000;
accessToUnderlyingConnectionAllowed=true; removeAbandoned=true;
removeAbandonedTimeout=60; logAbandoned=true; connectionProperties=null;
initSQL=null;
jdbcInterceptors=org.apache.tomcat.jdbc.pool.interceptor.ConnectionState;org.apache.tomcat.jdbc.pool.interceptor.StatementFinalizer;
jmxEnabled=true; fairQueue=false; useEquals=false; abandonWhenPercentageFull=0;
maxAge=0; useLock=false; dataSource=null; dataSourceJNDI=null;
alternateUsernameAllowed=false;
PoolName: Tomcat Connection Pool[1-6300663]
WaitCount: 0
JmxEnabled: true
TestWhileIdle: false
UseEquals: false
UseLock: false
DriverClassName: oracle.jdbc.driver.OracleDriver
RemoveAbandonedTimeout: 60
DbProperties: {user=xxxx, password=xxxx}
Idle: 2
LogAbandoned: true
FairQueue: false
PoolSweeperEnabled: true
ConnectionAsync:
org.apache.tomcat.jdbc.pool.ConnectionPool$ConnectionFuture@e9c2d3
JdbcInterceptorsAsArray:
Array[org.apache.tomcat.jdbc.pool.PoolProperties$InterceptorDefinition] of
length 2
org.apache.tomcat.jdbc.pool.PoolProperties$InterceptorDefinition@125f027
org.apache.tomcat.jdbc.pool.PoolProperties$InterceptorDefinition@1b99628
RemoveAbandoned: true
TimeBetweenEvictionRunsMillis: 30000
MinEvictableIdleTimeMillis: 30000
InitialSize: 10
Mar 6, 2012 9:18:20 AM org.apache.catalina.mbeans.MBeanDumper dumpBeans
SEVERE: Error getting attribute bean:name=eventingDataSource PooledConnection
javax.management.MBeanException: RuntimeException thrown in RequiredModelMBean
while trying to invoke operation getPooledConnection
at
javax.management.modelmbean.RequiredModelMBean.invokeMethod(RequiredModelMBean.java:1091)
at
javax.management.modelmbean.RequiredModelMBean.invoke(RequiredModelMBean.java:955)
at
org.springframework.jmx.export.SpringModelMBean.invoke(SpringModelMBean.java:90)
at
javax.management.modelmbean.RequiredModelMBean.getAttribute(RequiredModelMBean.java:1358)
at
org.springframework.jmx.export.SpringModelMBean.getAttribute(SpringModelMBean.java:109)
at
com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.getAttribute(DefaultMBeanServerInterceptor.java:666)
at
com.sun.jmx.mbeanserver.JmxMBeanServer.getAttribute(JmxMBeanServer.java:638)
at
org.apache.catalina.mbeans.MBeanDumper.dumpBeans(MBeanDumper.java:82)
at
org.apache.catalina.manager.JMXProxyServlet.listBeans(JMXProxyServlet.java:172)
at
org.apache.catalina.manager.JMXProxyServlet.doGet(JMXProxyServlet.java:121)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at
org.apache.catalina.filters.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:108)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:224)
at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:169)
at
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:581)
at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)
at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)
at
org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:927)
at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
at
org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:987)
at
org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:579)
at
org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:307)
at
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:619)
Caused by: java.lang.ClassCastException: $Proxy5 cannot be cast to
org.apache.tomcat.jdbc.pool.PooledConnection
at
org.apache.tomcat.jdbc.pool.DataSourceProxy.getPooledConnection(DataSourceProxy.java:156)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at sun.reflect.misc.Trampoline.invoke(MethodUtil.java:37)
at sun.reflect.GeneratedMethodAccessor31.invoke(Unknown Source)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at sun.reflect.misc.MethodUtil.invoke(MethodUtil.java:244)
at
javax.management.modelmbean.RequiredModelMBean.invokeMethod(RequiredModelMBean.java:1074)
... 30 more
Mar 6, 2012 9:18:22 AM org.apache.catalina.mbeans.MBeanDumper dumpBeans
SEVERE: Error getting attribute bean:name=eventingDataSource XAConnection
javax.management.MBeanException: Exception thrown in RequiredModelMBean while
trying to invoke operation getXAConnection
at
javax.management.modelmbean.RequiredModelMBean.invokeMethod(RequiredModelMBean.java:1101)
at
javax.management.modelmbean.RequiredModelMBean.invoke(RequiredModelMBean.java:955)
at
org.springframework.jmx.export.SpringModelMBean.invoke(SpringModelMBean.java:90)
at
javax.management.modelmbean.RequiredModelMBean.getAttribute(RequiredModelMBean.java:1358)
at
org.springframework.jmx.export.SpringModelMBean.getAttribute(SpringModelMBean.java:109)
at
com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.getAttribute(DefaultMBeanServerInterceptor.java:666)
at
com.sun.jmx.mbeanserver.JmxMBeanServer.getAttribute(JmxMBeanServer.java:638)
at
org.apache.catalina.mbeans.MBeanDumper.dumpBeans(MBeanDumper.java:82)
at
org.apache.catalina.manager.JMXProxyServlet.listBeans(JMXProxyServlet.java:172)
at
org.apache.catalina.manager.JMXProxyServlet.doGet(JMXProxyServlet.java:121)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at
org.apache.catalina.filters.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:108)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:224)
at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:169)
at
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:581)
at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)
at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)
at
org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:927)
at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
at
org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:987)
at
org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:579)
at
org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:307)
at
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:619)
Caused by: java.sql.SQLException: Connection from pool does not implement
javax.sql.XAConnection
at
org.apache.tomcat.jdbc.pool.DataSourceProxy.getXAConnection(DataSourceProxy.java:134)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at sun.reflect.misc.Trampoline.invoke(MethodUtil.java:37)
at sun.reflect.GeneratedMethodAccessor31.invoke(Unknown Source)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at sun.reflect.misc.MethodUtil.invoke(MethodUtil.java:244)
at
javax.management.modelmbean.RequiredModelMBean.invokeMethod(RequiredModelMBean.java:1074)
... 30 more
Apparently MBeanDumper is exposing any getter even if it isn't a property i.e.
getPooledConnection. Since this throws an exception trying to access
getPooledConnection the connection is never closed and returned to the pool
properly leading to abandoned connections causing a memory leak.
You can see more details in the user thread -
http://tomcat.10.n6.nabble.com/What-is-the-best-way-to-view-Tomcat-JDBC-pool-properties-in-Tomcat-7-td4557182.html
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