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All,
I'm writing an MBean for a component in one of my applications that
I'd like to be able to "reload" through JMX. The "reload" operation
basically re-loads some stuff from a relational database accessed
through a Tomcat-provided DataSource.
The problem is that when I call my "reload" method, which ultimately
uses JNDI to get the JDBC DataSource, I get a ClassNotFoundException:
2017-02-17 13:59:41,904 [RMI TCP Connection(5)-10.0.1.28] FATAL
my.great.ReloadableClass - Could not load DiagnosisEngine.
ServiceException: Cannot obtain database connection
at ReloadableBean.reload(ReloadableBean.java:159)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.jav
a:62)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessor
Impl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at sun.reflect.misc.Trampoline.invoke(MethodUtil.java:71)
at sun.reflect.GeneratedMethodAccessor448.invoke(Unknown Source)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessor
Impl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at sun.reflect.misc.MethodUtil.invoke(MethodUtil.java:275)
at
com.sun.jmx.mbeanserver.StandardMBeanIntrospector.invokeM2(StandardMBean
Introspector.java:112)
at
com.sun.jmx.mbeanserver.StandardMBeanIntrospector.invokeM2(StandardMBean
Introspector.java:46)
at
com.sun.jmx.mbeanserver.MBeanIntrospector.invokeM(MBeanIntrospector.java
:237)
at com.sun.jmx.mbeanserver.PerInterface.invoke(PerInterface.java:138)
at com.sun.jmx.mbeanserver.MBeanSupport.invoke(MBeanSupport.java:252)
at
com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBea
nServerInterceptor.java:819)
at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:80
1)
at
javax.management.remote.rmi.RMIConnectionImpl.doOperation(RMIConnectionI
mpl.java:1468)
at
javax.management.remote.rmi.RMIConnectionImpl.access$300(RMIConnectionIm
pl.java:76)
at
javax.management.remote.rmi.RMIConnectionImpl$PrivilegedOperation.run(RM
IConnectionImpl.java:1309)
at
javax.management.remote.rmi.RMIConnectionImpl.doPrivilegedOperation(RMIC
onnectionImpl.java:1401)
at
javax.management.remote.rmi.RMIConnectionImpl.invoke(RMIConnectionImpl.j
ava:829)
at sun.reflect.GeneratedMethodAccessor483.invoke(Unknown Source)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessor
Impl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:346)
at sun.rmi.transport.Transport$1.run(Transport.java:200)
at sun.rmi.transport.Transport$1.run(Transport.java:197)
at java.security.AccessController.doPrivileged(Native Method)
at sun.rmi.transport.Transport.serviceCall(Transport.java:196)
at
sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:568)
at
sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.j
ava:826)
at
sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(TCPTra
nsport.java:683)
at java.security.AccessController.doPrivileged(Native Method)
at
sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.ja
va:682)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.jav
a:1142)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.ja
va:617)
at java.lang.Thread.run(Thread.java:745)
Caused by: javax.naming.NoInitialContextException: Cannot instantiate
class: org.apache.naming.java.javaURLContextFactory [Root exception is
java.lang.ClassNotFoundException:
org.apache.naming.java.javaURLContextFactory]
at
javax.naming.spi.NamingManager.getInitialContext(NamingManager.java:674)
at javax.naming.InitialContext.getDefaultInitCtx(InitialContext.java:31
3)
at javax.naming.InitialContext.init(InitialContext.java:244)
at javax.naming.InitialContext.<init>(InitialContext.java:192)
at
com.chadis.web.util.DiagnosisEngineHelper.getConnection(DiagnosisEngineH
elper.java:136)
... 39 more
Caused by: java.lang.ClassNotFoundException:
org.apache.naming.java.javaURLContextFactory
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:348)
at
com.sun.naming.internal.VersionHelper12.loadClass(VersionHelper12.java:7
2)
at
com.sun.naming.internal.VersionHelper12.loadClass(VersionHelper12.java:6
1)
at
javax.naming.spi.NamingManager.getInitialContext(NamingManager.java:672)
... 43 more
I'm using Tomcat 8.0.41 on Oracle Java 8. I happen to be using
VisualVM as the client, but I don't believe the client makes any
difference.
I haven't yet checked to see if calling the reload() operation through
the JMXProxyServlet will work. I suspect it will work that way.
Can anyone think of a good way to get this to work? From my code, I
can probably set the CCL to the current class's ClassLoader and then
set it back after the operation, but that seems ugly. It also probably
won't work under a SecurityManager.
Any ideas?
- -chris
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