java cassandra connection java.lang.ClassNotFoundException: com.datastax.driver.core.Cluster

Question

I am trying to connect to Cassandra with datastax driver. So far I have just tried to run the SimpleClient app available in tutorials but I am having troubles.

Here is the Exception

Exception in thread "main" java.lang.NoClassDefFoundError: com/datastax/driver/core/Cluster
    at com.cass.App.connect(App.java:17)
    at com.cass.App.main(App.java:34)
Caused by: java.lang.ClassNotFoundException: com.datastax.driver.core.Cluster
    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)
    ... 2 more

Here is my maven file

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>com.cass</groupId>
  <artifactId>Connector</artifactId>
  <packaging>jar</packaging>
  <version>1.0-SNAPSHOT</version>
  <name>Connector</name>
  <url>http://maven.apache.org</url>
  <dependencies>
<dependency>
    <groupId>io.netty</groupId>
    <artifactId>netty-all</artifactId>
    <version>4.0.25.Final</version>
</dependency>
<dependency>
    <groupId>com.google.guava</groupId>
    <artifactId>guava</artifactId>
    <version>18.0</version>
</dependency>
<dependency>
    <groupId>com.yammer.metrics</groupId>
    <artifactId>metrics-core</artifactId>
    <version>2.2.0</version>
</dependency>
<dependency>
    <groupId>org.slf4j</groupId>
    <artifactId>slf4j-api</artifactId>
    <version>1.7.7</version>
</dependency>

    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.1</version>
      <scope>test</scope>
    </dependency>
<dependency>
  <groupId>com.datastax.cassandra</groupId>
  <artifactId>cassandra-driver-core</artifactId>
  <version>2.0.1</version>
</dependency>

  </dependencies>
<build>
      <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>
            <version>2.3.2</version>
            <configuration>
                <source>1.7</source>
                <target>1.7</target>
            </configuration>
        </plugin>
      </plugins>
    </build>
</project>

Here is my java file

package com.cass;

import com.datastax.driver.core.Cluster;
import com.datastax.driver.core.Host;
import com.datastax.driver.core.Metadata;

/**
 * Generate a unique number
 *
 */
public class App 
{

    private Cluster cluster;

public void connect(String node) {
      cluster = Cluster.builder()
            .addContactPoint(node).build();
      Metadata metadata = cluster.getMetadata();
      System.out.printf("Connected to cluster: %s\n", 
            metadata.getClusterName());
      for ( Host host : metadata.getAllHosts() ) {
         System.out.printf("Datatacenter: %s; Host: %s; Rack: %s\n",
               host.getDatacenter(), host.getAddress(), host.getRack());
      }
   }

   public void close() {
      cluster.close();
   }

   public static void main(String[] args) {
      App client = new App();
      client.connect("127.0.0.1");
      client.close();
   }
}

I am new to both Maven and Cassandra.

Edit - it was a stupid mistake of not including snapshot with dependencies in the cp java -cp target/CassandraTest2-1.0-SNAPSHOT-jar-with-dependencies.jar com.Test.App

did you solve it ? I had a similar problem. Could you update the question in case you solved? thanks — f_s
– f_s, Commented May 29, 2021 at 15:01

Community · Accepted Answer · 2017-05-23 12:23:03Z

2

Ok the issue is that the required jar is not present in classpath or when you are running from command prompt, it is not able to locate those jars.

Separator ; is for windows. On Unix systems you should use :

please follow these two links, similar issues with answers.

java -cp jar1:jar2:jar3:dir1:. MyProgram

Link1 and link2

edited May 23, 2017 at 12:23

CommunityBot

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answered Jan 12, 2015 at 4:28

Ankur Singhal

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5 Comments

pJAEY Over a year ago

Wouldn't maven handle the dependencies?

Ankur Singhal Over a year ago

@pJAEY Maven will download the jars and dependent jars, but you need to referenced it in your classpath.

Andy Tolbert Over a year ago

I'd recommend looking into the maven assembly plugin and jar-with-dependencies to build a jar that includes all dependencies. Another option is to use maven itself to run your main class using the exec:java goal to run your main class.

pJAEY Over a year ago

Didn't change anything. I fixed it by trying java -cp target/CassandraTest2-1.0-SNAPSHOT-jar-with-dependencies.jar com.Test.App

pJAEY Over a year ago

Good catch on the classpaths @ankur-singhal. thanks for the help :)

Darpan27 · Accepted Answer · 2016-08-24 19:29:18Z

0

I had the same issue. Only difference was datastax version was 2.1.1. Later i realized this version has an issue. My project started working after changing the version from 2.1.1 to 2.1.9 (In fact I tested your version too. it was working. Other that this version, it worked on all others. Strang!)

And for the maven. Yes, it does handle the dependency. Normally, if you put the dependency in pom file and run the class it handles. It did for me too.

answered Aug 24, 2016 at 19:29

Darpan27

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