I have created a jar file containing a JMXConnectorProvider - but I mistakenly mispelled the name of the implementation class in the services/javax.management.remote.JMXConnectorProvider file.

If this jar is in the classpath of a JMX client, like e.g. jconsole or visualvm, it prevents it from connecting with any kind of connectors - including the standard RMI connector.

See comments for reproducing the stack trace of the exception:

java.lang.IllegalArgumentException: javax.management.remote.JMXConnectorProvider: Provider com.sun.jmxns.provider.JMXNSConnectorProvider not found
        at com.sun.jmx.remote.util.Service.fail(Service.java:129)
        at com.sun.jmx.remote.util.Service.access$000(Service.java:111)
        at com.sun.jmx.remote.util.Service$LazyIterator.next(Service.java:272)
        at javax.management.remote.JMXConnectorFactory.getConnectorAsService(JMXConnectorFactory.java:425)
        at javax.management.remote.JMXConnectorFactory.newJMXConnector(JMXConnectorFactory.java:310)
        at javax.management.remote.JMXConnectorFactory.connect(JMXConnectorFactory.java:247)
        at javax.management.remote.JMXConnectorFactory.connect(JMXConnectorFactory.java:207)
        at sun.tools.jconsole.ProxyClient.tryConnect(ProxyClient.java:337)
        at sun.tools.jconsole.ProxyClient.connect(ProxyClient.java:297)
        at sun.tools.jconsole.VMPanel$2.run(VMPanel.java:280)