DataStax Java driver

Before using the DataStax driver, review the Best practices for DataStax drivers to understand the rules and recommendations for improving performance and minimizing resource utilization in applications that use a DataStax driver.

DataStax recommends using the unified DataStax driver. See this blog post for more information. You can also use the DataStax Enterprise (DSE) drivers, which exposes the same API for connecting to Cassandra databases.

You add a repository and dependencies to the pom.xml file for your project to download the appropriate .jar files for the Java driver and make them available to your code. Additionally, you implement a ConnectDatabase class to initialize the DSE Java driver.

Prerequisites

Downloading secure connect bundle

To connect to your Astra DB database using the drivers, download the secure database bundle from the DataStax Astra DB console that contains the connection credentials.

  1. Open a browser, navigate to Astra DB, and log in.

  1. From your Dashboard page, select your database.

  1. On the Overview page, select Connect.

  1. In the Connect using a driver section, click your preferred language from the list to load language-specific instructions.

    If you have multiple regions, select the region you want to connect to from the dropdown menu for instructions.

Note, though, that the bundle URL is the same for all languages.

  1. Click Download Bundle.

    If you have multiple regions, you will have the option to download a bundle for each region from the expanded Download Bundle drop-down menu.

If you’ve enabled VPC peering, you can also Download External Secure Connect Bundle for use within your VPC peering. The secure-connect-database_name.zip file downloads, which contains the security certificates and credentials for your database.

VPC peering is only available on Classic databases.

Alternatively, you can right-click the Download credentials link, copy the link source, and then use a curl command to download the secure-connect-database_name.zip file:

curl -L "<secure-connect-database_name-download-URL>" > database_name.zip

Sharing secure connect bundle

Although teammates can access your Astra DB database, it will not display in their list of available databases under My Databases in the Astra DB console.

After you create an Astra DB database, you can grant access to other members of your team by providing them with the database credentials and connection details for your database.

Be careful when sharing connection details. Providing this information to another user grants them access to your Astra DB database and ownership capabilities, such as making modifications to the database.

For security, delete downloaded connection credentials after sending them to your teammate.

Connecting Java driver

  1. Navigate to the pom.xml file at the root of your Java project and open it for editing.

For a complete pom.xml file, see the example pom.xml file below.

  1. Add the DataStax Java driver dependency to your pom.xml file, ensuring that the name of the dependency corresponds to the installed version: This dependency causes Maven to automatically download the appropriate .jar files found at the url specified in the repository for the DSE Java driver and make them available to your code.

<dependency>
  <groupId>com.datastax.oss</groupId>
  <artifactId>java-driver-core</artifactId>
  <version>4.6.1</version>
</dependency>
  1. Save and close your pom.xml file.

  2. Initialize the DataStax Java driver.

  3. Create a ConnectDatabase.java file in the /src/main/java directory for your Java project.

cd **javaProject**/src/main/java
touch ConnectDatabase.java
  1. Copy the following code for your DataStax driver into the ConnectDatabase.java file. The following example implements a ConnectDatabase class to connect to your Astra DB database, runs a CQL query, and prints the output to the console.

import com.datastax.oss.driver.api.core.CqlSession;
import com.datastax.oss.driver.api.core.cql.ResultSet;
import com.datastax.oss.driver.api.core.cql.Row;
import java.nio.file.Paths;

public class ConnectDatabase {

   public static void main(String[] args) {
       // Create the CqlSession object:
       try (CqlSession session = CqlSession.builder()
           .withCloudSecureConnectBundle(Paths.get("/path/to/secure-connect-database_name.zip"))
           .withAuthCredentials("clientId","clientSecret")
           .withKeyspace("keyspace_name")
           .build()) {
           // Select the release_version from the system.local table:
           ResultSet rs = session.execute("select release_version from system.local");
           Row row = rs.one();
           //Print the results of the CQL query to the console:
           if (row != null) {
               System.out.println(row.getString("release_version"));
           } else {
               System.out.println("An error occurred.");
           }
       }
       System.exit(0);
   }
}
  1. Make the following changes:

    • Use the withCloudSecureConnectBundle() method to specify the path to the secure connect bundle for your Astra DB database.

    • Use the withAuthCredentials() method to specify the username and password for your database.

    • Use the withKeyspace() method to specify the keyspace name for your database.

  1. Save and close the ConnectDatabase.java file.

Example pom.xml file

You can use the following pom.xml file in your Java project to connect to your Astra DB database. If you already have a pom.xml file for your Java project, copy only the repository and dependencies as indicated in the previous steps.

<?xml version="1.0" encoding="UTF-8"?>
<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/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>net.techne.web</groupId>
    <artifactId>cloudTest</artifactId>
    <version>1.0</version>
    <packaging>jar</packaging>
    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
        <java.driver.version>4.13.0</java.driver.version>
    </properties>
    <dependencies>
        <!-- START-javaDriverDependencyCore -->
        <dependency>
            <groupId>com.datastax.oss</groupId>
            <artifactId>java-driver-core</artifactId>
            <version>${java.driver.version}</version>
        </dependency>
        <!-- END-javaDriverDependencyCore -->
        <!-- START-javaDriverDependencyQuery -->
        <dependency>
            <groupId>com.datastax.oss</groupId>
            <artifactId>java-driver-query-builder</artifactId>
            <version>${java.driver.version}</version>
        </dependency>
        <!-- END-javaDriverDependencyQuery -->
        <!-- START-javaDriverDependencyMapper -->
        <dependency>
            <groupId>com.datastax.oss</groupId>
            <artifactId>java-driver-mapper-runtime</artifactId>
            <version>${java.driver.version}</version>
        </dependency>
        <!-- END-javaDriverDependencyMapper -->
    <dependencies>
</project>

Migrating Java driver

Complete the following procedure to migrate your existing DataStax Java driver to a version capable of connecting to Astra DB databases created using DataStax Astra DB.

  1. In your existing DSE Java driver code, update dependencies to include the DSE Java driver version that can connect to Astra DB databases.

DataStax Java driver for Apache Cassandra 4.x

<dependency>
  <groupId>com.datastax.oss</groupId>
  <artifactId>java-driver-core</artifactId>
  <version>4.6.0</version>
</dependency>

DataStax Java driver for Apache Cassandra 3.x

<dependency>
  <groupId>com.datastax.cassandra</groupId>
  <artifactId>cassandra-driver-core</artifactId>
  <version>3.8.0</version>
</dependency>

DSE Java 2.x

<dependency>
  <groupId>com.datastax.dse</groupId>
  <artifactId>dse-java-driver-core</artifactId>
  <version>2.3.0</version>
</dependency>

DSE Java 1.x

<dependency>
  <groupId>com.datastax.dse</groupId>
  <artifactId>dse-java-driver-core</artifactId>
  <version>1.9.0</version>
</dependency>
  1. Optional: To use DSE QueryBuilder, which is a utility used to generate CQL queries programmatically, add the following dependency to your pom.xml file:

<dependency>
  <groupId>com.datastax.dse</groupId>
  <artifactId>dse-java-driver-query-builder</artifactId>
  <version>4.6.0</version>
</dependency>
  1. Modify the connection code to use the Astra DB API. In the CqlSession or Session objects (DseCluster or DseSession objects for DSE), include the path to the secure connect bundle for your Cassandra database (secure-connect-database_name.zip) in the withCloudSecureConnectBundle() method, as shown in the following example.

CqlSession session = CqlSession.builder()
  .withCloudSecureConnectBundle("/path/to/secure-connect-database_name.zip")
  .withAuthCredentials("clientId","clientSecret")
  .withKeyspace("keyspace_name")
  .build())",       "language": "text",       "name": "{company} Java driver for Apache Cassandra 4.x

DataStax Java driver for Apache Cassandra 3.x

Session session = Cluster.builder()
  .withCloudSecureConnectBundle("/path/to/secure-connect-database_name.zip")
  .withAuthProvider(new PlainTextAuthProvider("clientId", "clientSecret"))
  .build()
  .connect("keyspace_name"))

Java 2.x

DseSession session = DseSession.builder()
  .withCloudSecureConnectBundle("/path/to/secure-connect-database_name.zip")
  .withAuthCredentials("clientId", "clientSecret")
  .withKeyspace("keyspace_name")
  .build();

Java 1.x

DseCluster cluster = DseCluster.builder()
  .withCloudSecureConnectBundle("/path/to/secure-connect-database_name.zip")
  .withCredentials("clientId", "clientSecret")
  .build();
DseSession session = cluster.connect("keyspace_name");

If converting from using the open source Cassandra Java driver to the DSE Java driver, ensure that you change Session to DseSession.

  1. Build the project to test the connection.

mvn clean compile exec:java -Dexec.mainClass=YourJavaDriver.java

If successful, the code builds, compiles, and connects to your Cassandra database.