java.lang.NoClassDefFoundError: ch/qos/logback/core/joran/spi/JoranException while connecting Cassandra DB

Question

I was trying out a simple connection to my Cassandra instance through Java. I made a 'demo' keyspace to cqlsh and created a table in the java program. The code is below:

Jars Used:

• slf4j.api-1.6.1

• cassandra-all-2.1.2

  public class CassandraConnection {
  
      public static void main(String[] args){
  
          String ipAddress="127.0.0.1";
          String keySpace="demo";
  
          Cluster cluster;
  
          Session session;
  
          cluster=Cluster.builder().addContactPoint(ipAddress).build();
  
          session=cluster.connect(keySpace);
  
          System.out.println("====================Before insert");
  
          String cqlInsertStmt="insert into users (lastname,age,city,email,firstname) values"
          +"('Gopalan',32,'Paramakkudi','[email protected]','Murugan') ";
  
          session.execute(cqlInsertStmt);
  
          String cqlSelectStmt="select * from users";
          ResultSet resultSet=session.execute(cqlSelectStmt);
  
          System.out.println("=================After insert");
  
          for(Row row: resultSet){
  
              System.out.format("%s %s %d %s %s \n", row.getString("firstname"),row.getString("lastname"),row.getInt("age"),row.getString("city"),row.getString("email"));
          }
  
          System.out.println("=================After update");
  
      }
  }
  

I am getting the following error:

Failed to instantiate SLF4J LoggerFactory
Reported exception:
java.lang.NoClassDefFoundError: ch/qos/logback/core/joran/spi/JoranException
    at org.slf4j.LoggerFactory.bind(LoggerFactory.java:150)
    at org.slf4j.LoggerFactory.performInitialization(LoggerFactory.java:124)
    at org.slf4j.LoggerFactory.getILoggerFactory(LoggerFactory.java:412)
    at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:357)
    at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:383)
    at com.datastax.driver.core.Cluster.<clinit>(Cluster.java:60)
    at CassandraConnection.main(CassandraConnection.java:21)
Caused by: java.lang.ClassNotFoundException: ch.qos.logback.core.joran.spi.JoranException
    at java.net.URLClassLoader$1.run(Unknown Source)
    at java.net.URLClassLoader$1.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    ... 7 more
Exception in thread "main" java.lang.NoClassDefFoundError: ch/qos/logback/core/joran/spi/JoranException
    at org.slf4j.LoggerFactory.bind(LoggerFactory.java:150)
    at org.slf4j.LoggerFactory.performInitialization(LoggerFactory.java:124)
    at org.slf4j.LoggerFactory.getILoggerFactory(LoggerFactory.java:412)
    at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:357)
    at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:383)
    at com.datastax.driver.core.Cluster.<clinit>(Cluster.java:60)
    at CassandraConnection.main(CassandraConnection.java:21)
Caused by: java.lang.ClassNotFoundException: ch.qos.logback.core.joran.spi.JoranException
    at java.net.URLClassLoader$1.run(Unknown Source)
    at java.net.URLClassLoader$1.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    ... 7 more

Answer 1

You have to make sure that the logback JAR is within your classpath.

See here for starters; and beyond that; the real take-away here: the runtime is telling you that it can't find a certain class; and it gives you the full name of that class. Or you look here to read what Cassandra has to say about logback.

You take that input; and then you turn to your favorite search engine in order to figure what is going on.