diff --git a/checker/bin/wpi.sh b/checker/bin/wpi.sh
index 90c896e070b..174e9a47c67 100755
--- a/checker/bin/wpi.sh
+++ b/checker/bin/wpi.sh
@@ -331,6 +331,9 @@ stdout is in      $dljc_stdout"
 if [ "${DLJC}" = "" ]; then
   # The user did not set the DLJC environment variable.
   DLJC="${SCRIPTDIR}/.do-like-javac/dljc"
+  if [ ! -f "${DLJC}" ]; then
+    (cd "$SCRIPTDIR"/../.. && ./gradlew getDoLikeJavac)
+  fi
 else
   # The user did set the DLJC environment variable.
   if [ ! -f "${DLJC}" ]; then
@@ -338,6 +341,9 @@ else
     exit 1
   fi
 fi
+if [ ! -f "$SCRIPTDIR/../dist/checker.jar" ] ; then
+  (cd "$SCRIPTDIR"/../.. && ./gradlew assembleForJavac)
+fi
 
 #### Main script