Thread: Java installed but not listed in Windows 10 Apps

Dear community,

Sorry, but I again don’t know what the appropriate forum for my problem is.

I was following a Maven fundamentals course on Pluralsight, but I got stuck there (it didn’t work). So I switched to https://www.tutorialspoint.com/maven/index.htm.

I did not exactly follow the setup steps since I had already done that sort of stuff. Then, when I instructed in the command prompt
mvn --version
the response was
Unrecognized option: -
Error: Could not create the Java Virtual Machine.
Error: A fatal exception has occurred. Program will exit.

Java also is unable to run some .java .class and .jar file (which is normal, but before I had managed to make at least one of them work).

The instruction
java --version
returns
openjdk 18.0.2.1 2022-08-18
OpenJDK Runtime Environment (build 18.0.2.1+1-1)
OpenJDK 64-Bit Server VM (build 18.0.2.1+1-1, mixed mode, sharing)


I looked for a soluiton on https://helpdeskgeek.com/help-desk/h...machine-error/
None of the suggestions work.

Uninstalling Java fails because it is not listed in Windows Apps list. Java’s installation folder also doesn’t seem to contain an uninstaller.

How can I get Maven to work and why isn’t Java listed as an installed program ?

Originally Posted by Norm

Try asking about Maven on this forum: https://coderanch.com/forums

OK, thanks. I shall have a look.
Does the failure to launch a JVM likely due to a problem with Maven rather than with Java ?

Originally Posted by Norm

How did you install Java?

I downloaded the file openjdk-18.0.2.1_windows-x64_bin.zip from somowhere and unzipped it to its final location. (I remember that not having to run an installer confused me.) I suspect that before doing that I uninstalled Java using the Windows App list. There is often something there, as in the HelpDeskGeek article, called Java 8. what is Java 8 ?

No, extracting in a folder does not cause a program to appear on the Window's application list. I don’t know what an install does either, except add a program to Window’s application list. Apparently HelpDeskGeek assumed that if one has Java, one must have done a Windows install, even though one can use Java without having done a Windows install.

Originally Posted by Amoranemix

mvn --version
the response was
Unrecognized option: -

I reckon that's because mvn wants a single "-" for it's options. Try typing

mvn -version or mvn -v instead.

The error says "Unrecognised option: -", which I think indicates that it read the first "-", expected one of it's options next, but instead was given another "-", which is not one of its options.

In System Environment Variables I had created the variable MAVEN_OPTS with value
-Xms256m – Xmx512m

Now, what could the Command Prompt mean with “Unrecognized option: -” ?

Bingo !

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