Java Download Error Message On Mac

If the JAVAHOME variable is set as javahome, JAVAHOME or JavaHome, a Unix, Linux or Ubuntu script will have a hard time finding it. The same thing goes for the value attached to the JAVA. Java has not been pre-installed on Macs since OS X version 10.7 (Lion) and later. To download and install the latest version of Java from Oracle, Mac users who are running OS X version 10.7 or later need to visit the web site. Going through the Java update process helps to keep your Mac safe from potential Java vulnerabilities.

Over the years, computers have gotten relatively better at providing useful error messages. However, due to the complexity of modern software, sometimes you need a degree to even understand what you’re being told.

In this article, we’ll explain what the most common Java Virtual Machine errors mean and how you can resolve the underlying issues. Before we get to that, though, we first have to understand what a virtual machine is. Shall we begin?

Before you install Java Runtime Environment to fix the issue, follow the below steps to check whether Java is installed and LibreOffice is able to detect it. Open LibreOffice (calc, Impress, etc). Go to from Menu: Tools - Options - Advanced under LibreOffice. Under Java Options window, if Java is installed you would see it listed. Make sure you have a recent Java JRE installed on your system. Gephi is compatible with Java 7 and 8 versions. Download Free Java here. After the download completes, run the installer and follow the steps. After the download completes, click on the downloaded.dmg file. Drag the gephi application in your Application folder.

What Is A Virtual Machine?

In layman’s term, a virtual machine allows your computer to simulate an entirely separate system. This makes it possible to run programs that otherwise wouldn’t be compatible with your system architecture – for instance, Android apps on a Windows PC. So what does this have to do with Java?


When a Java file is executed, it’s run through a version of the Java Virtual Machine before the code is interpreted. This means that if there’s a problem with the virtual machine, you won’t even be able to run Java programs until it’s been resolved.

“Java Virtual Machine Launcher Could Not Find The Main Class”

This sounds like a pretty serious error but in actuality, it’s one of the easiest to fix. Generally, if you’re seeing this, something has gone wrong with your Java installation. All you have to do is reinstall it. To do this:

  • Uninstall your previous Java installation. For Windows users, this is done in the Control Panel’s Programs and Features submenu.


Java Download Error Message On Mac Windows 10

  • Next, go to Java’s site and select the correct version for your operating system.
  • Restart your computer and try running the Java file again.

“Could Not Create The Java Virtual Machine”

Here’s another example of a vague error message that doesn’t actually help you in any way. The good news is that this error usually has one specific cause: Java is trying to use more memory than your system actually has. So how do you fix this?

Java download error message on mac os
  • Begin by opening the Control Panel.
  • Click System, then Advanced Systems Properties, then Environment Variables


  • Click the Add button
  • Set the New Variable Name to “_JAVA_OPTIONS” without the quotation marks.
  • Set the value to -Xmx512M” without the quotation marks. The digits before the M refer to the maximum amount of RAM allocated to Java. For instance, you could also use “-Xmx1024M” or “-Xmx256M”, if you had more or less memory to spare.

Fixes To Avoid

There are a few solutions that users on internet forums LOVE to suggest, but while they mean well, you are highly unlikely to see your problem resolved by:

  • Running an anti-malware scan (a virus that only messes with your Java Runtime Environment? For what purpose?).
  • Clearing your cache. This has nothing to do with Java, whatsoever.


Common Java Error Messages

  • Changing registry values. While this has the potential to resolve very specific problems, it can have catastrophic effects on your operating system and you’re more likely to break something than fix it.
  • Reinstalling your operating system. This is like amputating an arm because of a broken fingernail! Problems with a single software package can be easily resolved and won’t lead to you losing all your files, as with a fresh installation.

Do you need to update Javascript? We have an easy and helpful guide on how to update it. Read it here!


Java Virtual Machine errors are rarely as serious as they appear. In fact, we’ve shown that the most common errors can be resolved in a few steps. Even though the exact options you’ll need will differ from one operating system to another, at least you now know what you have to do.

Now that you’ve read on how to fix Java Virtual Machine Launcher Error, take time to read on how to log into Kronos Timekeeper from home.

After upgrading to a newer version of Mac OS X (Yosemite 10.10 and El Capitan 10.11) or macOS (Sierra 10.12 and High Sierra 10.13), you may end up getting an annoying new pop-up message whenever you start your computer. It says, “To use the java command-line tool, you need to install a JDK.” It asks you to click “More Info” and visit the JDK (Java Developer Kit) download website.

Java Download Error Message On Mac Catalina

The reason you’re receiving this message is due to the removal of Java support in newer versions of OS X for security reasons. Older software such as Adobe Photoshop and Illustrator requires legacy Java support. Without a compatible Java command-line tool for these software, you’ll get this pop-up every time you turn on your Mac computer.

When you visit the download website to update Java, you find that the issue isn’t resolved! You’re still getting the same pop-up. This isn’t a complicated issue to fix, but it is an indirect one. The problem is that you’re not being routed to the correct download website when you click “More Info.”

Apple could have remedied this issue by programming the “More Info” button to direct you to the right fix. Here are the steps you can take to finally rid yourself of this pop-up:

Fix Java Command-Line Tool Pop-Up on Mac OS X
  • Download Java for OS X 2017-001 aka Apple’s version of Legacy Java Command-line tool.
  • Mount the .dmg disk image file and install Java 6 runtime for OS X.
  • Restart your Mac and enjoy the absence of this Java command-line tool error pop-up!