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Neither in Ubuntu nor in Debian the tool visualvm is part of the OpenJDK 7 package. It's part of the Oracle JDK 7 and seems to be GPL licensed. While in Ubuntu it can be installed with a separate package, such a package doesn't exist in Debian.
Why isn't it part of the OpenJDK packages?
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Various optional tools, including Java VisualVM, are provided with the Java Development Kit (JDK) for retrieving different types of data about running JVM software instances.
VisualVM is an open source tool to monitor JVM instances of each running JVM application. Its built-in features can be further enhanced by installing plugins. The users of Oracle JDK or OpenJDK 9 can download this open source tool from https://visualvm.github.io/index.html.
To find the location of your Java VisualVM userdir, choose Help > About from the main menu and click Details in the About Java VisualVM window.
Use VisualVM bundled with GraalVMGraalVM contains a fully compliant Java SE 8, Java SE 11, and Java SE 17 JDK distribution based on Oracle JDK and OpenJDK. It features an innovative JIT compiler which may noticeably improve performance of Java applications, compared to the standard Oracle JDK or OpenJDK.
Our Ubuntu machine did not include VisualVM as part of the Java JDK. A quick search showed that the package was available as a separate install:
$ apt-cache search visualvm
...
visualvm - All-in-One Java Troubleshooting Tool
Quick Install:
$ apt-get install visualvm
After successful installation:
$ which jvisualvm
/usr/bin/jvisualvm
I tried running it, but it kept complaining that it was using the JRE. I edited /etc/visualvm/visualvm.conf
# default location of JDK/JRE, can be overridden by using --jdkhome <dir> switch
jdkhome="/usr/lib/jvm/java-6-openjdk-amd64"
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