问题

Exception in thread "main" java.lang.NoClassDefFoundError: com/fasterxml/jackson/databind/ObjectMapper
	at org.apache.activemq.broker.jmx.PersistenceAdapterView.<clinit>(PersistenceAdapterView.java:31)
	at org.apache.activemq.store.kahadb.KahaDBPersistenceAdapter.doStart(KahaDBPersistenceAdapter.java:235)
	at org.apache.activemq.util.ServiceSupport.start(ServiceSupport.java:55)
	at org.apache.activemq.broker.BrokerService.doStartPersistenceAdapter(BrokerService.java:687)
	at org.apache.activemq.broker.BrokerService.startPersistenceAdapter(BrokerService.java:671)
	at org.apache.activemq.broker.BrokerService.start(BrokerService.java:635)
	at com.sks.activemq.queue.EmberBroker.main(EmberBroker.java:16)
Caused by: java.lang.ClassNotFoundException: com.fasterxml.jackson.databind.ObjectMapper
	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)
	... 7 more

解决方法

引入依赖

        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
            <version>2.10.2</version>
        </dependency>