Hi, I just found some strange behavior of the method stopProviding() on DBScheduleProvider. If I call this piece of code

ObjectName mbean = new ObjectName("jboss:service=PortalDBScheduleProvider");

MBeanServer server = MBeanServerLocator.locateJBoss();
server.invoke(mbean, "stopProviding", new Object[0], new String[0]);
server.invoke(mbean, "startProviding", new Object[0], new String[0]);

it works without problems for the first time, but if it's called more times, then it throws following exceptions

2007-09-19 16:02:48,500 ERROR [search.IndexServlet] Timer configuration from web administration failed.:class javax.management.RuntimeMBeanException:null
2007-09-19 16:02:48,515 ERROR [STDERR] javax.management.RuntimeMBeanException
2007-09-19 16:02:48,515 ERROR [STDERR] at org.jboss.mx.interceptor.ReflectedDispatcher.handleInvocationExceptions(ReflectedDispatcher.java:176)
2007-09-19 16:02:48,515 ERROR [STDERR] at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:163)
2007-09-19 16:02:48,515 ERROR [STDERR] at org.jboss.mx.server.Invocation.dispatch(Invocation.java:94)
2007-09-19 16:02:48,515 ERROR [STDERR] at org.jboss.mx.server.Invocation.invoke(Invocation.java:86)
2007-09-19 16:02:48,515 ERROR [STDERR] at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:264)
2007-09-19 16:02:48,515 ERROR [STDERR] at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:659)
2007-09-19 16:02:48,515 ERROR [STDERR] at search.IndexServlet.doGet(IndexServlet.java:79)
2007-09-19 16:02:48,515 ERROR [STDERR] at javax.servlet.http.HttpServlet.service(HttpServlet.java:697)
2007-09-19 16:02:48,515 ERROR [STDERR] at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
2007-09-19 16:02:48,515 ERROR [STDERR] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
2007-09-19 16:02:48,515 ERROR [STDERR] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
2007-09-19 16:02:48,515 ERROR [STDERR] at com.tecsidel.portal.system.web.filters.ConfigFilter.doFilter(ConfigFilter.java:25)
2007-09-19 16:02:48,515 ERROR [STDERR] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
2007-09-19 16:02:48,515 ERROR [STDERR] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
2007-09-19 16:02:48,515 ERROR [STDERR] at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
2007-09-19 16:02:48,515 ERROR [STDERR] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
2007-09-19 16:02:48,515 ERROR [STDERR] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
2007-09-19 16:02:48,515 ERROR [STDERR] at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
2007-09-19 16:02:48,515 ERROR [STDERR] at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
2007-09-19 16:02:48,515 ERROR [STDERR] at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:175)
2007-09-19 16:02:48,515 ERROR [STDERR] at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:524)
2007-09-19 16:02:48,515 ERROR [STDERR] at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:74)
2007-09-19 16:02:48,515 ERROR [STDERR] at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
2007-09-19 16:02:48,515 ERROR [STDERR] at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
2007-09-19 16:02:48,515 ERROR [STDERR] at org.jboss.web.tomcat.tc5.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:156)
2007-09-19 16:02:48,515 ERROR [STDERR] at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
2007-09-19 16:02:48,515 ERROR [STDERR] at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
2007-09-19 16:02:48,515 ERROR [STDERR] at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869)
2007-09-19 16:02:48,515 ERROR [STDERR] at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664)
2007-09-19 16:02:48,515 ERROR [STDERR] at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
2007-09-19 16:02:48,515 ERROR [STDERR] at org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWorkerThread.java:112)
2007-09-19 16:02:48,515 ERROR [STDERR] at java.lang.Thread.run(Thread.java:595)
2007-09-19 16:02:48,515 ERROR [STDERR] Caused by: javax.management.RuntimeMBeanException
2007-09-19 16:02:48,515 ERROR [STDERR] at org.jboss.mx.interceptor.ReflectedDispatcher.handleInvocationExceptions(ReflectedDispatcher.java:176)
2007-09-19 16:02:48,515 ERROR [STDERR] at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:163)
2007-09-19 16:02:48,515 ERROR [STDERR] at org.jboss.mx.server.Invocation.dispatch(Invocation.java:94)
2007-09-19 16:02:48,515 ERROR [STDERR] at org.jboss.mx.server.Invocation.invoke(Invocation.java:86)
2007-09-19 16:02:48,515 ERROR [STDERR] at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:264)
2007-09-19 16:02:48,515 ERROR [STDERR] at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:659)
2007-09-19 16:02:48,515 ERROR [STDERR] at org.jboss.varia.scheduler.AbstractScheduleProvider.removeSchedule(AbstractScheduleProvider.java:163)
2007-09-19 16:02:48,515 ERROR [STDERR] at org.jboss.varia.scheduler.DBScheduleProvider.stopProviding(DBScheduleProvider.java:207)
2007-09-19 16:02:48,515 ERROR [STDERR] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
2007-09-19 16:02:48,515 ERROR [STDERR] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
2007-09-19 16:02:48,515 ERROR [STDERR] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
2007-09-19 16:02:48,515 ERROR [STDERR] at java.lang.reflect.Method.invoke(Method.java:585)
2007-09-19 16:02:48,515 ERROR [STDERR] at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:155)
2007-09-19 16:02:48,515 ERROR [STDERR] ... 30 more
2007-09-19 16:02:48,515 ERROR [STDERR] Caused by: java.lang.NullPointerException
2007-09-19 16:02:48,515 ERROR [STDERR] at org.jboss.varia.scheduler.ScheduleManager.removeSchedule(ScheduleManager.java:332)
2007-09-19 16:02:48,515 ERROR [STDERR] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
2007-09-19 16:02:48,515 ERROR [STDERR] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
2007-09-19 16:02:48,515 ERROR [STDERR] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
2007-09-19 16:02:48,515 ERROR [STDERR] at java.lang.reflect.Method.invoke(Method.java:585)
2007-09-19 16:02:48,515 ERROR [STDERR] at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:155)
2007-09-19 16:02:48,515 ERROR [STDERR] ... 41 more

When I looked on the source code of the stopProviding() method, I found that the schedulers are removed from the ScheduleManager through the removeSchedule() method, but they still stays in the list of schedulers inside of the DBScheduleProvider. So if this method is than called again, it tries to remove them again. And this ends with the NullPointerException shown above.

Whats wrong? The way I am using these methods or their behavior?

Thanks