diff --git a/lang/java/build.sh b/lang/java/build.sh
index 96fdb3489cb..7d6dade1a80 100755
--- a/lang/java/build.sh
+++ b/lang/java/build.sh
@@ -16,6 +16,7 @@
 # limitations under the License.
 
 set -e
+set -x
 
 usage() {
   echo "Usage: $0 {lint|test|dist|clean}"