Exception in thread "Thread-1" java.lang.
NoClassDefFoundError: org/apache/log4j/jmx/
HierarchyDynamicMBean
at org.apache.zookeeper.jmx.
ManagedUtil.
registerLog4jMBeans(
ManagedUtil.java:50)
at org.apache.zookeeper.server.
quorum.QuorumPeerMain.
runFromConfig(QuorumPeerMain.
java:122)
at com.complexible.stardog.pack.
cli.ZkStart$1.run(ZkStart.
java:119)
at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.
ClassNotFoundException: org.apache.log4j.jmx.
HierarchyDynamicMBean
at java.net.URLClassLoader$1.run(
Unknown Source)
at java.net.URLClassLoader$1.run(
Unknown Source)
at java.security.
AccessController.doPrivileged(
Native Method)
at java.net.URLClassLoader.
findClass(Unknown Source)
at java.lang.ClassLoader.
loadClass(Unknown Source)
at sun.misc.Launcher$
AppClassLoader.loadClass(
Unknown Source)
at java.lang.ClassLoader.
loadClass(Unknown Source)
... 4 more
简单说吧，这个问题折腾我一下午，后来发现是jar包冲突
因为我之前在 $JAVA_HOME/jre/lib/ext/ 添加过一个log4j的jar包，这里运行zk就报错了，
那么把 $JAVA_HOME/jre/lib/ext/ 的log4j 删了就好了
zookeeper 启动ClassNotFoundException
原文：http://my.oschina.net/u/1421929/blog/475294
