[LOG4J2-396] Disable JMX by default

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Not A Problem
• Affects Version/s: 2.0-beta8
• Component/s: JMX
• Assignee: Unassigned
• Reporter: Abhinav Shah
• Created: 05/Sep/13 21:58
• Updated: 06/Sep/13 16:25
• Resolved: 06/Sep/13 16:25

Description

Shouldn't we disable JMX by default?
I see currently in Log4jContextFactory, the MBeans are being registered by default -

public Log4jContextFactory() {
        final String sel = PropertiesUtil.getProperties().getStringProperty(Constants.LOG4J_CONTEXT_SELECTOR);
        if (sel != null) {
            try {
                final Class<?> clazz = Loader.loadClass(sel);
                if (clazz != null && ContextSelector.class.isAssignableFrom(clazz)) {
                    selector = (ContextSelector) clazz.newInstance();
                }
            } catch (final Exception ex) {
                LOGGER.error("Unable to create context " + sel, ex);
            }
        }
        if (selector == null) {
            selector = new ClassLoaderContextSelector();
        }
        try {
            Server.registerMBeans(selector);
        } catch (final Exception ex) {
            LOGGER.error("Could not start JMX", ex);
        }
    }

The is causing errors in my standalone java application which is a simple console utility.
I am getting the following error as Log4j tries to register MBeans -

java.lang.IllegalAccessError: tried to access method javax.management.StandardMBean.<init>(Ljava/lang/Object;Ljava/lang/Class;Z)V from class sun.management.ManagementFactory
	at sun.management.ManagementFactory.addMXBean(ManagementFactory.java:249)
	at sun.management.ManagementFactory.createPlatformMBeanServer(ManagementFactory.java:304)
	at java.lang.management.ManagementFactory.getPlatformMBeanServer(ManagementFactory.java:504)
	at org.apache.logging.log4j.core.jmx.Server.registerMBeans(Server.java:107)
	at org.apache.logging.log4j.core.impl.Log4jContextFactory.<init>(Log4jContextFactory.java:59)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
	at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
	at java.lang.Class.newInstance0(Class.java:355)
	at java.lang.Class.newInstance(Class.java:308)
	at org.apache.logging.log4j.LogManager.<clinit>(LogManager.java:85)
	at org.slf4j.helpers.Log4jLoggerFactory.getContext(Log4jLoggerFactory.java:90)
	at org.slf4j.helpers.Log4jLoggerFactory.getLogger(Log4jLoggerFactory.java:46)
	at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:270)
	at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:281)
	at com.labcorp.eag.util.jms.SaveQueueToFiles.<clinit>(SaveQueueToFiles.java:45)
Exception in thread "main" 

Currently I overcome this error by setting

-Dlog4j2.disable.jmx=true

Issue Links

• is related to: LOG4J2-321 Provide configuration alternative to system properties
• is related to: LOG4J2-324 Potential performance improvement for StatusLogger