Improve doc on building Java
@@ -26,7 +26,8 @@ You can also setup CentOS 7 natively and install the following build dependencie
### Build Java modules
- sh bootstrap.sh
+ export MAVEN_OPTS="-Xms128m -Xmx512m"
+ sh bootstrap.sh java
mvn -T <num-threads> install
### Build C++ modules
