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From Churu Tang <ct...@rubiconproject.com>
Subject Re: How to run a simple Java Client
Date Wed, 29 Oct 2014 20:45:33 GMT
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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