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From Steven Siebert <smsi...@gmail.com>
Subject Re: How to run a simple Java Client
Date Wed, 29 Oct 2014 20:55:02 GMT
 >> ~$ java ZKClient -classpath zookeeper-3.4.6.jar

You're passing your classpath and jar file name in as arguments.

Assuming your executing from directory that contains both the class file
you compiled and the zookeeper jar,try:

 java -cp . ZKClient

On Wed, Oct 29, 2014 at 4:45 PM, Churu Tang <ctang@rubiconproject.com>
wrote:

> Hi Ben,
>
> Thanks for you reply! I include the classpath, but it still throws the
> same error
>
> ~$ java ZKClient -classpath zookeeper-3.4.6.jar
> 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.
>
> Anything else you think I can do to make it right?
>
> Cheers,
> Churu
>
> On Oct 29, 2014, at 1:28 PM, Ben Hsu <ben.hsu@criticalmedia.com> wrote:
>
> > 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 <ctang@rubiconproject.com>
> > 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();
> >>    }
> >>
> >> }
> >>
> >>
>
>

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