Hi Churu I believe you have to set your classpath when running java (not just when running javac!)
On Wed, Oct 29, 2014 at 4:07 PM, Churu Tang <[email protected]> wrote: > Hi, > > I try to run a simple Java Client, but it keep throwing an error. Would > someone help me to figure out why? > ~$ javac ZKClient.java -classpath zookeeper-3.4.6.jar > ~$ java ZKClient > Exception in thread "main" java.lang.NoClassDefFoundError: > org/apache/zookeeper/Watcher > Caused by: java.lang.ClassNotFoundException: org.apache.zookeeper.Watcher > at java.net.URLClassLoader$1.run(URLClassLoader.java:217) > at java.security.AccessController.doPrivileged(Native Method) > at java.net.URLClassLoader.findClass(URLClassLoader.java:205) > at java.lang.ClassLoader.loadClass(ClassLoader.java:321) > at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294) > at java.lang.ClassLoader.loadClass(ClassLoader.java:266) > Could not find the main class: ZKClient. Program will exit. > > I am a beginner in Java and Zookeeper, sorry for such a simple question. > Many thanks! > > Cheers, > Churu > > > ——————————————————————————ZKClient.java————————————————————————————— > import java.io.IOException; > > import org.apache.zookeeper.CreateMode; > import org.apache.zookeeper.KeeperException; > import org.apache.zookeeper.WatchedEvent; > import org.apache.zookeeper.Watcher; > import org.apache.zookeeper.ZooDefs.Ids; > import org.apache.zookeeper.ZooKeeper; > > public class ZKClient { > > public static void main(String[] args) throws Exception{ > Watcher wh = new Watcher(){ > @Override > public void process(WatchedEvent event) { > System.out.println(event.toString()); > } > }; > ZooKeeper zk = new ZooKeeper("localhost:2181",30000,wh); > System.out.println("=========Create Node==========="); > zk.create("/ctang", "znode1".getBytes(), Ids.OPEN_ACL_UNSAFE, > CreateMode.PERSISTENT); > System.err.println("=============Verify node created > successfully==============="); > System.out.println(new String(zk.getData("/ctang", false, null))); > System.out.println("=========Modify data=========="); > zk.setData("/ctang", "sharpxiajun130901".getBytes(), -1); > System.out.println("========Verify node modified > successfully========="); > System.out.println(new String(zk.getData("/ctang", false, null))); > System.out.println("=======Delete node=========="); > zk.delete("/ctang", -1); > System.out.println("==========Verify node deleted > successfully============"); > System.out.println("Note status：" + zk.exists("/ctang", false)); > zk.close(); > } > > } > >
