Add debugging

Author: cindy-peng

.kokoro/build.sh

@@ -62,15 +62,16 @@ javadoc)
 integration)
     # Kokoro integration test uses both JDK 11 and JDK 8. Integration
     # tests require JDK 11 to compile the classes.
-    if [[ -n "${JAVA11_HOME}"  &&  -n "${JAVA8_HOME}" ]]; then
+    if [[ -n "${JAVA11_HOME}"  &&  -n "${JAVA8_HOME}" ]]
+    then
       export JAVA=${JAVA11_HOME}/bin/java
-      export SUREFIRE_JVM_OPT="-Djvm=${JAVA8_HOME}/bin/java"
+      export SUREFIRE_JVM_OPT=-Djvm=${JAVA8_HOME}/bin/java
       echo "Java:${JAVA}"
       echo "Java 11:${JAVA11_HOME}"
       echo "Java 8:${JAVA8_HOME}"
       echo "SUREFIRE_JVM_OPT: ${SUREFIRE_JVM_OPT}"
     fi
-    ;;
+
     mvn -B ${INTEGRATION_TEST_ARGS} \
       -ntp \
       -Penable-integration-tests \