Julian Sedding created SLING-13251:
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Summary: MBean registration in ServletFilterManager fails for
factory components
Key: SLING-13251
URL: https://issues.apache.org/jira/browse/SLING-13251
Project: Sling
Issue Type: Bug
Components: Engine
Affects Versions: Engine 2.16.8
Reporter: Julian Sedding
Assignee: Julian Sedding
When multiple servlet {{Filter}} components are registered via factory
configurations, JMX MBean registration fails with an
{{InstanceAlreadyExistsException}} (see below).
This happens, because the MBean name is derived from the {{component.name}}
property before the {{service.pid}} property. The {{component.name}} is the
same for multiple configurations of the same component, while the
{{service.pid}} reflects the factory configuration's {{name}} in addition to
the {{component.name}}.
E.g.
{{service.pid}}:
com.adobe.cq.wcm.core.components.internal.servlets.TableOfContentsFilter~commons
{{component.name}}:
com.adobe.cq.wcm.core.components.internal.servlets.TableOfContentsFilter
Preferring the {{service.pid}}, if present, should resolve this issue.
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2026-06-16 11:56:22.096 ERROR [SlingServletContext-registration]
org.apache.aries.jmx.whiteboard.MBeanHolder register: Failure registering MBean
org.apache.sling.engine.impl.filter.FilterProcessorMBeanImpl@4333330f
javax.management.InstanceAlreadyExistsException:
org.apache.sling:type=engine-filter,service=com.adobe.cq.wcm.core.components.internal.servlets.TableOfContentsFilter
at
java.management/com.sun.jmx.mbeanserver.Repository.addMBean(Repository.java:322)
at
java.management/com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerWithRepository(DefaultMBeanServerInterceptor.java:1848)
at
java.management/com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerDynamicMBean(DefaultMBeanServerInterceptor.java:945)
at
java.management/com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerObject(DefaultMBeanServerInterceptor.java:880)
at
java.management/com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerMBean(DefaultMBeanServerInterceptor.java:315)
at
java.management/com.sun.jmx.mbeanserver.JmxMBeanServer.registerMBean(JmxMBeanServer.java:523)
at
org.apache.aries.jmx.whiteboard.MBeanHolder.register(MBeanHolder.java:114)
[org.apache.aries.jmx.whiteboard:1.2.0]
at
org.apache.aries.jmx.whiteboard.JmxWhiteboardSupport.registerMBean(JmxWhiteboardSupport.java:88)
[org.apache.aries.jmx.whiteboard:1.2.0]
at
org.apache.aries.jmx.whiteboard.Activator$MBeanTracker.addingService(Activator.java:102)
[org.apache.aries.jmx.whiteboard:1.2.0]
at
org.osgi.util.tracker.ServiceTracker$Tracked.customizerAdding(ServiceTracker.java:944)
at
org.osgi.util.tracker.ServiceTracker$Tracked.customizerAdding(ServiceTracker.java:872)
at
org.osgi.util.tracker.AbstractTracked.trackAdding(AbstractTracked.java:256)
at org.osgi.util.tracker.AbstractTracked.track(AbstractTracked.java:229)
at
org.osgi.util.tracker.ServiceTracker$Tracked.serviceChanged(ServiceTracker.java:904)
at
org.apache.felix.framework.EventDispatcher.invokeServiceListenerCallback(EventDispatcher.java:990)
at
org.apache.felix.framework.EventDispatcher.fireEventImmediately(EventDispatcher.java:838)
at
org.apache.felix.framework.EventDispatcher.fireServiceEvent(EventDispatcher.java:545)
at org.apache.felix.framework.Felix.fireServiceEvent(Felix.java:4863)
at org.apache.felix.framework.Felix.registerService(Felix.java:3834)
at
org.apache.felix.framework.BundleContextImpl.registerService(BundleContextImpl.java:328)
at
org.apache.felix.framework.BundleContextImpl.registerService(BundleContextImpl.java:335)
at
org.apache.sling.engine.impl.filter.ServletFilterManager.initFilter(ServletFilterManager.java:170)
[org.apache.sling.engine:2.16.6]
at
org.apache.sling.engine.impl.filter.ServletFilterManager.bindFilter(ServletFilterManager.java:135)
[org.apache.sling.engine:2.16.6]
[...]
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