It works! Thank you Cameron for your patient and detailed explain! Thank you Ibrahim!
~$ java -cp "./:zookeeper-3.4.6.jar:./lib/*" ZKClient log4j:WARN No appenders could be found for logger (org.apache.zookeeper.ZooKeeper). log4j:WARN Please initialize the log4j system properly. log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info. =========Create Node=========== WatchedEvent state:SyncConnected type:None path:null =============Verify node created successfully=============== znode1 =========Modify data========== ========Verify node modified successfully========= sharpxiajun130901 =======Delete node========== ==========Verify node deleted successfully============ Note status：null Cheers, Churu On Oct 29, 2014, at 3:19 PM, Ibrahim El-sanosi (PGR) <[email protected]> wrote: > Hi Churu, > > These are some examples of setting the class path in run time: > > 1- java -cp target/lib/*:target/* edu.brown.cs.zkbenchmark.ZooKeeperBenchmark > --conf benchmark.conf > > 2- java -cp target/my-app-1.0-SNAPSHOT.jar com.mycompany.app.App > > 3- javac -classpath > ./log4j-1.2.16.jar:./slf4j-api-1.6.1.jar:./slf4j-log4j12-1.6.1.jar > LearnerLeaderACK/*.java > java -cp .:./log4j-1.2.16.jar:./slf4j-api-1.6.1.jar:./slf4j-log4j12-1.6.1.jar > LearnerLeaderACK/StartLeader > > > Ibrahim > > -----Original Message----- > From: Churu Tang [mailto:[email protected]] > Sent: Wednesday, October 29, 2014 08:46 م > To: [email protected] > Subject: Re: How to run a simple Java Client > > 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(); >>> } >>> >>> } >>> >>> >
