Perhaps you are running on a JRE rather than a JDK?

[Llama]

Hi,

I’ve been trying to run some Java example:

~/spaces/frp/sodium/book/swidgets/java (master ✔) ᐅ mvn test -Pclearfield

Full error message looks like this: Compilation failure
[ERROR] No compiler is provided in this environment. Perhaps you are running on a JRE rather than a JDK?

Much the same with ant:

~/spaces/frp/sodium/book/swidgets/java (master ✔) ᐅ ant clearfield
Buildfile: /home/alexey/spaces/frp/sodium/book/swidgets/java/build.xml
...
BUILD FAILED
/home/alexey/spaces/frp/sodium/book/swidgets/java/build.xml:12: The following error occurred while executing this line:
/home/alexey/spaces/frp/sodium/java/build.xml:43: Unable to find a javac compiler;
com.sun.tools.javac.Main is not on the classpath.
Perhaps JAVA_HOME does not point to the JDK.
It is currently set to "/usr/lib/jvm/java-8-openjdk/jre"

I’ve read everything the ArchWiki says on the matter; everything looks fine.

[andreas85]

What about archlinux-java status ?

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[megavolt]

@Llama

Unable to find a javac compiler;

Should be usually in /usr/lib/jvm/java-8-openjdk/bin/javac and can be found through the PATH variable:

echo $PATH

That’s the usual way how it is found.

Is jdk8-openjdk installed?

[vrms]

what does java -version say? It should tell you whether a jre (java runtime environment) or .jdk (java developer kit) is present on your system.

And, as the message suggests, you seem to need a jdk.

Maybe this is worth a look to understand the matter in more depth.