diff --git a/tools/build/bazel/java_sources.bzl b/tools/build/bazel/java_sources.bzl
new file mode 100644
index 0000000..3a47569
--- /dev/null
+++ b/tools/build/bazel/java_sources.bzl
@@ -0,0 +1,42 @@
+# Copyright 2015 The Bazel Authors. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+def _impl(ctx):
+  jar = ctx.outputs.jar
+
+  src_list = ""
+  for src in ctx.files.srcs:
+    if src.path.endswith(".srcjar"):
+      src_list += " " + src.path
+
+  cmd = [
+      "for sj in %s; do jar xf $sj; done" % src_list,
+      "dir=$(find . -type d -name java)",
+      "[ -n \"$dir\" -a -d \"$dir\" ] && jar cf %s -C $dir ." % jar.path,
+  ]
+
+  ctx.action(
+      inputs = ctx.files.srcs,
+      outputs = [jar],
+      progress_message = "Generating source jar for %s" %  ctx.attr.name,
+      command = ";\n".join(cmd)
+  )
+
+java_sources = rule(
+    attrs = {
+        "srcs": attr.label_list(allow_files = True),
+    },
+    implementation = _impl,
+    outputs = {"jar" : "%{name}.jar"},
+)
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