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 <[email protected]> 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 <[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();
>> }
>>
>> }
>>
>>
