View source for HOWTO: Check the version of Java running on your preservation node

The [https://www.lockss.org/ LOCKSS Development Team] released a new version of the [[LOCKSS daemon]] on 3 February 2021 (version 1.75.5). One of the changes to the software is that new versions of LOCKSS no longer support [https://en.wikipedia.org/wiki/Java_version_history#Java_SE_7 Java 7]. All machines getting updated versions of LOCKSS will need to have [https://en.wikipedia.org/wiki/Java_version_history#Java_SE_8 Java 8] or later installed, or else LOCKSS will not start.

If you run an ADPNet [[Preservation Node]], and you are not sure what version of Java your machine currently has installed, here is a check-list for how to check that.

== Use SSH Command Line to Check ==

* If you are able to SSH into your [[LOCKSS box]], you can run <code>java -version</code> to see what it says.

* This is described in [https://lockss.github.io/administrators/classic-lockss/upgrading-java lockss.github.io: Upgrading Java]:

<blockquote><p>1. Check the currently installed Java version:</p>

<pre>java -version</pre>

<p>If the output indicates a version number beginning with 1.8, Java 8 is already installed, no further action is needed. Example:</p>

<pre>openjdk version "1.8.0_265"
OpenJDK Runtime Environment (build 1.8.0_265-b01)
OpenJDK 64-Bit Server VM (build 25.265-b01, mixed mode)</pre>

<p>If the output indicates a version number beginning with 1.7, Java 7 needs to be uninstalled and Java 8 installed. Example:</p>

<pre>java version "1.7.0_221"
OpenJDK Runtime Environment (rhel-2.6.18.0.el7_6-x86_64 u221-b02)
OpenJDK 64-Bit Server VM (build 24.221-b02, mixed mode)</pre>
</blockquote>

'''''If you find out that you need to upgrade to Java 8,''' see [[HOWTO: Upgrade the version of Java running on your preservation node]].''

== Use Web Interface to Check ==

* If you are ''not'' able to SSH into a LOCKSS box, but you can access the LOCKSS management web interface, then you can get a report from the web interface using this URL (replace '''[HOSTNAME]''' with the domain name for your LOCKSS box):

  http://'''[HOSTNAME]''':8081/DaemonStatus?table=PlatformStatus

The results should look something like this. You want to take a look at the '''Java Version''' field:

[[File:Lockss-Daemon-Status-Java-Version-20200223.png]]

If the output indicates a version number beginning with 1.8, Java 8 is already installed, no further action is needed. If the output indicates a version number beginning with 1.7, Java 7 needs to be uninstalled and Java 8 installed.

'''''If you find out that you need to upgrade to Java 8,''' see [[HOWTO: Upgrade the version of Java running on your preservation node]].''