How to make a Cassandra connection

Question

i want to do a connection with Cassandra with java class.But its not working .Here is my code ..

import com.datastax.driver.core.Cluster;
import com.datastax.driver.core.Row;
import com.datastax.driver.core.Session;


class CassandraConnection { 

public static void main(String[] args) {
    String serverIp = "166.78.10.41";
    String keyspace = "gamma";
    CassandraConnection connection;

    Cluster cluster = Cluster.builder()
            .addContactPoints(serverIp)
            .build();

    Session session = cluster.connect(keyspace);


    String cqlStatement = "SELECT * FROM TestCF";
    for (Row row : session.execute(cqlStatement)) {
        System.out.println(row.toString());
    }

}
}

this is the error log..

BUILD FAILURE

Total time: 0.883s Finished at: Wed Jun 05 15:54:02 IST 2013

Final Memory: 4M/15M

Failed to execute goal on project CassandraConnection: Could not resolve dependencies for project com.mycompany:CassandraConnection:jar:1.0-SNAPSHOT: The following artifacts could not be resolved: com.datastax.cassandra:cassandra-driver-parent:jar:1.0.0, org.specs2:scalaz-effect_2.11.0-SNAPSHOT:jar:7.0.1-SNAPSHOT, org.scalaz:scalaz-effect_2.9.3:jar:7.1.0-SNAPSHOT: Failure to find com.datastax.cassandra:cassandra-driver-parent:jar:1.0.0 in http://repo.maven.apache.org/maven2 was cached in the local repository, resolution will not be reattempted until the update interval of central has elapsed or updates are forced -> [Help 1]

To see the full stack trace of the errors, re-run Maven with the -e switch. Re-run Maven using the -X switch to enable full debug logging.

For more information about the errors and possible solutions, please read the following articles: [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/DependencyResolutionException

Answer 1

Am not a cassandra expert, but Just by looking at the error, it seems that maven cannot resolve the cassandra related dependencies

SOLUTION:

1. I manually checked the maven repo (http://repo.maven.apache.org/maven2) casandra dependencies are present, which indicate that you may have problem in connecting the maven repo from your machine it could be firewall issue.
2. In case firewall is not allowing you download the file from maven repo, download the file manually and install the file manually to your local repo (http://maven.apache.org/plugins/maven-install-plugin/install-file-mojo.html).

Answer 2

To be more specific, enter something like this in the section of the pom file:

<dependency>
      <groupId>com.datastax.cassandra</groupId>
      <artifactId>cassandra-driver-core</artifactId>
      <version>2.0.0-rc2</version>
</dependency>

Answer 3

Adding to above from Sajan it could be possible that the downloaded file in your local repository is corrupt so you can follow step 2 of his suggestions.