Updating Java for Cassandra

By default, DataMiner installs Cassandra with its own Java 8 installation. This is typically located in C:\Program Files\Cassandra\Java\bin. DataMiner deploys Cassandra with Java 1.8.0_91. Cassandra depends on Java 8. We do not recommend deploying Java 11.

Tip

• A PowerShell script to update the Java version is available at Cassandra Hardening.
• If you do not want the hassle of maintaining the DataMiner storage databases yourself, we recommend using DataMiner Storage as a Service instead.

To update the Java version:

1. Download the latest OpenJDK 8 JRE binaries from the official website.

   Note

   You can download the latest OpenJDK 8 JRE binaries from the OpenJDK Wiki. Make sure to download the Windows x64 archive. For example: OpenJDK8U-jre_x64_windows_8u322b06.zip

2. Stop the DataMiner Agent.

3. Stop the Cassandra service.

4. Rename the C:\Program Files\Cassandra\Java folder to C:\Program Files\Cassandra\Java_bak.

5. Create a new Java folder in C:\Program Files\Cassandra.

6. Extract the OpenJDK archive you downloaded and copy the binaries to C:\Program Files\Cassandra\Java.

7. Start the Cassandra service.

8. Start the DataMiner Agent.