diff --git a/pkgs/development/compilers/ecj/builder.sh b/pkgs/development/compilers/ecj/builder.sh
new file mode 100644
index 00000000000..67297e2fd87
--- /dev/null
+++ b/pkgs/development/compilers/ecj/builder.sh
@@ -0,0 +1,21 @@
+. $stdenv/setup
+
+unzip $src
+cd jdtcoresrc
+ant -f compilejdtcorewithjavac.xml
+
+mkdir -p $out/share/ecj
+mv ecj.jar $out/share/ecj
+
+mkdir -p $out/bin
+
+cat >> $out/bin/ecj <<EOF
+#! /bin/sh
+
+export JAVA_HOME=$j2re
+export LANG="en_US"
+
+$j2re/bin/java -cp $out/share/ecj/ecj.jar org.eclipse.jdt.internal.compiler.batch.Main \$@
+EOF
+
+chmod u+x $out/bin/ecj
diff --git a/pkgs/development/compilers/ecj/default.nix b/pkgs/development/compilers/ecj/default.nix
new file mode 100644
index 00000000000..a0428608d16
--- /dev/null
+++ b/pkgs/development/compilers/ecj/default.nix
@@ -0,0 +1,13 @@
+{stdenv, fetchurl, unzip, ant, j2re}: 
+
+stdenv.mkDerivation {
+  name = "ecj-3.1";
+  builder = ./builder.sh;
+  src = fetchurl {
+    url = ftp://sunsite.informatik.rwth-aachen.de/pub/mirror/eclipse/R-3.1-200506271435/eclipse-sourceBuild-srcIncluded-3.1.zip;
+    md5 = "19ad65d52005da5eaa1d3687b3a50de2";
+  };
+
+  inherit j2re;
+  buildInputs = [unzip ant j2re];
+}
diff --git a/pkgs/system/all-packages-generic.nix b/pkgs/system/all-packages-generic.nix
index 873502502cd..a1e725daaaa 100644
--- a/pkgs/system/all-packages-generic.nix
+++ b/pkgs/system/all-packages-generic.nix
@@ -482,6 +482,11 @@ rec {
     inherit fetchurl stdenv;
   };
 
+  ecj = (import ../development/compilers/ecj) {
+    inherit fetchurl stdenv unzip j2re;
+    ant  = apacheAntBlackdown14;
+  };
+
   blackdown = (import ../development/compilers/blackdown) {
     inherit fetchurl stdenv;
   };
diff --git a/pkgs/system/populate-cache.nix b/pkgs/system/populate-cache.nix
index 9dd5c325b59..88d20f40299 100644
--- a/pkgs/system/populate-cache.nix
+++ b/pkgs/system/populate-cache.nix
@@ -110,6 +110,8 @@ let {
     blackdown
     apacheAntBlackdown14
     jikes
+    ecj
+    j2re
     jetty
   ;};