u* tools: per-language wrappers (#1086)

diff --git a/tools/javathreads.sh b/tools/javathreads.sh
new file mode 100755
index 0000000..442d2c9
--- /dev/null
+++ b/tools/javathreads.sh
@@ -0,0 +1,3 @@
+#!/bin/bash
+lib=$(dirname $0)/lib
+$lib/uthreads.py -l java "$@"