java: Normalize to the default jre / jdk

nixos/modules/services/monitoring/riemann.nix

@@ -17,7 +17,7 @@ let
 
   launcher = writeScriptBin "riemann" ''
     #!/bin/sh
-    exec ${openjdk}/bin/java ${concatStringsSep "\n" cfg.extraJavaOpts} \
+    exec ${jdk}/bin/java ${concatStringsSep "\n" cfg.extraJavaOpts} \
       -cp ${classpath} \
       riemann.bin ${writeText "riemann-config.clj" riemannConfig}
   '';

nixos/modules/services/search/solr.nix

@@ -22,7 +22,7 @@ let
       cp common/lib/*.jar $out/lib/
       ln -s ${pkgs.ant}/lib/ant/lib/ant.jar $out/lib/
       ln -s ${cfg.solrPackage}/lib/ext/* $out/lib/
-      ln -s ${pkgs.openjdk}/lib/openjdk/lib/tools.jar $out/lib/
+      ln -s ${pkgs.jdk.home}/lib/tools.jar $out/lib/
     '' + optionalString (cfg.extraJars != []) ''
       for f in ${concatStringsSep " " cfg.extraJars}; do
          cp $f $out/lib

nixos/release-small.nix

@@ -61,12 +61,12 @@ in rec {
       gettext
       git
       imagemagick
+      jdk
       linux
       mysql51
       mysql55
       nginx
       nodejs
-      openjdk
       openssh
       php
       postgresql92