jsonschema2pojo: depend on openjdk

Formula/jsonschema2pojo.rb

@@ -3,14 +3,18 @@ class Jsonschema2pojo < Formula
   homepage "http://www.jsonschema2pojo.org/"
   url "https://github.com/joelittlejohn/jsonschema2pojo/releases/download/jsonschema2pojo-1.0.2/jsonschema2pojo-1.0.2.tar.gz"
   sha256 "158e927558e3ae4779dc2b7cd00e2010e43465af5a5aebdb55c889ccacb4d6e3"
+  revision 1
 
   bottle :unneeded
 
-  depends_on :java => "1.6+"
+  depends_on "openjdk"
 
   def install
     libexec.install "jsonschema2pojo-#{version}-javadoc.jar", "lib"
-    bin.write_jar_script libexec/"lib/jsonschema2pojo-cli-#{version}.jar", "jsonschema2pojo"
+    (bin/"jsonschema2pojo").write <<~EOS
+      #!/bin/bash
+      exec "#{Formula["openjdk"].opt_bin}/java" -jar "#{libexec}/lib/jsonschema2pojo-cli-#{version}.jar" "$@"
+    EOS
   end
 
   test do