Starting Zookeeper Cluster. Error: Could not find or load main class org.apache.zookeeper.server.quorum.QuorumPeerMain

问题

(I'm running on CentOS 5.8). I've been following the direction for a Clustered (Multiserver) Zookeeper Set-up, but getting an error when I try to start up my server. When I run the command as described in the documentation:

java -cp zookeeper-3.4.6.jar:lib/log4j-1.2.16.jar:conf \ org.apache.zookeeper.server.quorum.QuorumPeerMain conf/zoo.cfg

I get the error:

Error: Could not find or load main class  org.apache.zookeeper.server.quorum.QuorumPeerMain

I have my files location as such and am running from the ~/zookeeper-3.4.6 directory:

~/zookeeper-3.4.6/zookeeper-3.4.6.jar 
~/zookeeper-3.4.6/conf/zoo.cfg
~/zookeeper-3.4.6/data/myid
~/zookeeper-3.4.6/lib/log4j-1.2.16.jar
~/zookeeper-3.4.6/bin/zkServer.sh

Does anyone know why this error is happening? I don't quite understand the arguments that are being passed, so it is hard for me to debug the path issue. As a side note, I've tried running ./zookeeper-3.4.6/bin/zkServer.sh start, which did successfully work, but the documentation seems to indicate that command is meant for a single-node instance.

Edit:

I was able to make some progress by modifying the command and taking out the :conf \ part, so now I'm running:

java -cp zookeeper-3.4.6.jar:lib/log4j-1.2.16.jar: org.apache.zookeeper.server.quorum.QuorumPeerMain conf/zoo.cfg

I get a new error, but this is progress...

Exception in thread "main" java.lang.NoClassDefFoundError: org/slf4j/LoggerFacto
ry
        at org.apache.zookeeper.server.quorum.QuorumPeerMain.<clinit>(QuorumPeer
Main.java:64)
Caused by: java.lang.ClassNotFoundException: org.slf4j.LoggerFactory
        at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
        ... 1 more

which corresponds to lines 63 and 64 from QuorumPeerMain

public class QuorumPeerMain {
    private static final Logger LOG = LoggerFactory.getLogger(QuorumPeerMain.class);

回答1:

You should be able to run zkServer.sh to get a clustered setup. It will use the same conf/zoo.cfg that you are providing manually, which will contain the cluster endpoints.

The best way to check what you are missing from your classpath (and see the proper java command) is to run the zkServer.sh you said worked for you.

When it starts up, check the actual command used like this:

ps -ef | grep zookeeper

回答2:

I got the Error: Could not find or load main class org.apache.zookeeper.server.quorum.QuorumPeerMain while installing 3.5.5, because I had downloaded the zookeeper .tar file and not the .bin.tar file. Downloading, untarring and using the bin.tar file fixed it for me.

回答3:

I got the same errors. I solved the error by check the README.md file in apache-zookeeper-[version].tar.gz Just type:

mvn clean install -DskipTests

then start the zookeeper. You will solve the error, too.

回答4:

I also get this error when try to run Apache Zookeper v3.5.5 on Windows:

Error: Could not find or load main class org.apache.zookeeper.server.quorum.QuorumPeerMain

As said by @Onnonymous, I finish my problem by downloading the .bin.tar.gz (here) instead of .tar.gz version.

回答5:

This happens when you download and used apache-zookeeper-X.X.X.tar.gz, you should use apache-zookeeper-X.X.X-bin.tar.gz. this will surely solve this issue

来源：https://stackoverflow.com/questions/28484398/starting-zookeeper-cluster-error-could-not-find-or-load-main-class-org-apache

标签

apache

cluster-computing

apache-zookeeper