launch4j issue

[Tariqq Mehmoodd]

Sir I am using Netbeans 12 for java 15 desktop maven project

I want to build project so I am trying to install launch4j
So I download it from this link
https://sourceforge.net/projects/launch4j/

When I try to install it then it says:

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launch4j
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This application requires a Java Runtime Environment 1.6.0 - 1.8.9
The registry refers to a nonexistent Java Runtime Environment installation or the runtime is corrupted.
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OK  
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Is it necessary to install JRE or this is path issue?

Java installation folder has following structure

https://imgur.com/a/QmWdEM8

Please

[Norm Radder]

Try passing this to Google for lots of suggestions:   Java Runtime Environment 1.6.0 - 1.8.9

[Stephan van Hulst]

run4j uses register keys set by the Oracle JRE installer to determine the location of a JRE to use.

Either install the Java 8 JRE from Oracle, or if you prefer to use OpenJDK, you need to set the register keys yourself. You can easily find them on the Oracle website if you Google.

[Matthew Bendford]

Although this may be off-topic: I question the error message for two things:

a) it mentions 1.6.0 to 1.8.9 specifically
Someboy may correct me, but was there ever any version that made use of the 3rd minor? As far as I recall the format was and still is 1.X.0 where X is the Java version. I only recall very early versions up to 1.4.2 using all 3 digits, but at least since Java 5(.0) the last digit was always set to 0.

b) it has an upper maximum version
I'm not sure what 1.8.9 is supposed to mean - this isn't a Minecraft version - and although Java 9 broke a lot of codes this shouldn't be true for Launch4J, as all it does is combine a jar with a windows executable PE header.