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Cannot find JVM required for new installation. [message #1793886]

Sat, 18 August 2018 22:28

Patrick Moran

Messages: 62
Registered: March 2018

Member

I'm trying to upgrade to latest Eclipse but fail. with: "Version 1.6.9_65 of the JVM" is not suitable
The full error message I get is:
- Version 1.6.9_65 of the JVM is not suitable for this. product.
Version 1.8 or greater is required.

I've searched the Oracle site and they have a jvm.dll but nothing else seems relevant. I've installed the Eclipse-suggested version of Java, and also the very newest version, I even restarted, but get the same error message.

I'm using Mac OS 10.13.6 , which is fine with Oxygen.

Why do I get the same error regardless of what version of Java is installed? And what is a JVM? I've Googled JVM and just get a few random mentions.

[Updated on: Sat, 18 August 2018 22:31]

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Re: Cannot find JVM required for new installation. [message #1793889 is a reply to message #1793886]

Sun, 19 August 2018 04:09

Ed Merks

Messages: 29552
Registered: July 2009

Senior Member

The Mac has some idiosyncrasies. The OS will generally give wrong feedback about the required JVM, often telling you that you need an older one when you might already have a newer JRE installed. Did you read the following?

https://wiki.eclipse.org/Eclipse/Installation

There it says:

If you're using Mac, and you don't have a JDK installed, you may get a bogus message from the OS stating that you should "install the legacy Java SE 6 runtime". Installing that will not solve the problem, because recent versions of Eclipse require a higher version. If you install just a JRE, and not a full JDK, that error message will persist. You must install a full JDK.

So on the Mac you must install a JDK. It must be at least 1.8 for any recent version of Eclipse. The installer will try to find a suitable JDK. It uses the following command to find them all, i.e., it parses the XML emitted by the following:

/usr/libexec/java_home -X

A JVM is a Java Virtual Machine. A JRE is a Java Runtime Environment and a JDK is a Java Development Toolkit. Both a JRE and a JDK contain a JVM (the Java executable that you run which can emulate/executate the .class file byte code), along with the Java class libraries they need, but a JDK contains more tools and includes a JRE. I have no idea why a full JDK is required on the Mac, but it is.

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