After installing Java, what should I set JAVA_HOME to?

[Zachary Kanfer <zkanfer@gmail.com>]

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I've installed the java compiler (see the manifest file at [1] the end of
this email). I'm able to compile Java files directly, which is great.

But I started the gradle quickstart guide
<https://docs.gradle.org/current/userguide/tutorial_java_projects.html>,
and I've started running into problems. Right now I have $JAVA_HOME set to
/home/zck/.guix-profile/, but I am suspecting that is not right. When I run
`./gradlew clean`, I get the following error:

    zck@zck-laptop:~/code/gradle-test$ ./gradlew clean
    Downloading https://services.gradle.org/distributions/gradle-3.0-bin.zip

    Exception in thread "main" javax.net.ssl.SSLException:
java.lang.RuntimeException: Unexpected error:
java.security.InvalidAlgorithmParameterException:
the trustAnchors parameter must be non-empty

(further stacktrace elided)

When I run `sudo ./gradlew clean`, it works fine. My suspicion is that it's
related to $JAVA_HOME being symlinked to something not owned by my current
user (/home/zck/.guix-profile is a symlink to
/var/guix/profiles/per-user/zck/guix-profile/, which is a symlink to
/var/guix/profiles/per-user/zck/guix-profile-20-link/, which is a symlink
to /gnu/store/c483gnpwwcmcwdbdba25q3c7x1g79mzm-profile/, which is owned by
root/guixbuild, although this directory has permissions to read and execute
for all users).

Further supporting my suspicion that JAVA_HOME shouldn't be the guix
profile is that I would think either guix or java should manage the
directory, but not both.

So my question is: what's going on here? What do I need to change to be
able to run gradle as my current user? Thanks.

[1] The manifest file to install javac is:

(use-package-modules java)

(packages->manifest
 (list ;;java
       icedtea
       (list icedtea "jdk")))

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