add piston nix pkg for openjdk-java

packages/java/15.0.2/build.sh

@@ -1,9 +0,0 @@
-#!/usr/bin/env bash
-
-# Put instructions to build your package in here
-
-curl "https://download.java.net/java/GA/jdk15.0.2/0d1cfde4252546c6931946de8db48ee2/7/GPL/openjdk-15.0.2_linux-x64_bin.tar.gz" -o java.tar.gz
-
-tar xzf java.tar.gz --strip-components=1
-rm java.tar.gz
-

packages/java/15.0.2/environment

@@ -1,4 +0,0 @@
-#!/usr/bin/env bash
-
-# Put 'export' statements here for environment variables
-export PATH=$PWD/bin:$PATH

packages/java/15.0.2/metadata.json

@@ -1,5 +0,0 @@
-{
-    "language": "java",
-    "version": "15.0.2",
-    "aliases": []
-}

packages/java/15.0.2/run

@@ -1,7 +0,0 @@
-#!/usr/bin/env bash
-
-# Put instructions to run the runtime
-mv $1 $1.java
-filename=$1.java
-shift
-java $filename "$@"

packages/java/15.0.2/test.java

@@ -1,5 +0,0 @@
-public class HelloWorld {
-    public static void main(String[] args) {
-        System.out.println("OK");
-    }
-}

runtimes/default.nix

@@ -40,4 +40,5 @@ args: {
     "jvm-kotlin" = import ./jvm-kotlin.nix args;
     "julia" = import ./julia.nix args;
     "jelly" = import ./jelly.nix args;
+    "openjdk-java" = import ./openjdk-java.nix args;
 }

runtimes/openjdk-java.nix

@@ -0,0 +1,34 @@
+{pkgs, piston, ...}:
+let
+    pkg = pkgs.openjdk;
+in piston.mkRuntime {
+    language = "java";
+    version = pkg.version;
+    runtime = "openjdk";
+    aliases = [];
+
+    run = ''
+        mv $1 $1.java
+        filename=$1.java
+        shift
+        ${pkg}/bin/java $filename "$@"
+    '';
+
+    tests = [
+        (piston.mkTest {
+            files = {
+                "test.java" = ''
+                    public class PrinOK {
+                        public static void main(String[] args) {
+                            System.out.println("OK");
+                        }
+                    }
+                '';
+            };
+            args = [];
+            stdin = "";
+            packages = [];
+            main = "test.java";
+        })
+    ];
+}