`JAVA_HOME` or `java.jdt.ls.java.home` should not be required for projects that don't develop Java code

[tudortimi-ifx]

Extension Name: vscode-gradle
Extension Version: v3.12.2
OS Version: RHEL8
VSCode version: 1.62.2

Describe the bug
The extension complains about not finding a setting for JAVA_HOME or java.jdt.ls.java.home, even when it's not being used to develop Java code. The extension seems to partially work, though. No language server is started, but Gradle tasks can be executed.

To Reproduce
Start VS Code with extension installed without installing Java extension, without setting a JAVA_HOME environment variable (but with java in PATH.

Expected behavior
I would expect the extension to fall back on the system location for java, which is on PATH, like Gradle itself does, and not require JAVA_HOME or the Java VS Code extension. I see from #249 that this is what the extension used to do.

Screenshots

Output from "Gradle for Java"
Log showing that the system installation for Java is being taken, but I'm guessing this comes from Gradle, not from VS Code.

[info] [gradle-server] Server started, listening on 43861
[info] Gradle client connected to server
[info] Java Home: /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.322.b06-2.el8_4.x86_64
[info] JVM Args: -XX:MaxMetaspaceSize=256m,-XX:+HeapDumpOnOutOfMemoryError,-Xms256m,-Xmx512m,-Dfile.encoding=UTF-8,-Duser.country=US,-Duser.language=en,-Duser.variant

Does the bug still exist if you disable all other extensions?
Yes

[CsCherrYY]

Is there any gap if you set JAVA_HOME in your environment variable? AFAIK Gradle it self will adopt both the two configurations, but i'm not sure which has the higher priority (JAVA_HOME and PATH)

[tudortimi]

To make sure we're on the same page, the problem isn't with Gradle, but with the language server that the extension tries to start.

[tudortimi]

I can, of course, set JAVA_HOME to make it work. This means, though, that all other developers also need to set JAVA_HOME before starting VS Code. The extension could make life easy by trying to extract JAVA_HOME from the java executable that is on PATH, as it used to.

[tudortimi]

Also, my java executable on RHEL8 is /bin/java. To get the extension to work with this executable, I have to set JAVA_HOME to /, which looks very weird.

[CsCherrYY]

Get it. I'm going to let the language server pick the same config with Gradle.