Java commonly used util functions

Jave:
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Paths.get(a, b);  // path join
String.format("%s, haha ", a);

Dependency Injection: Guice
https://github.com/google/guice/wiki/Motivation

https://github.com/google/guice/wiki/GettingStarted

Java docs:
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http://www.grpc.io/grpc-java/javadoc/io/grpc/stub/StreamObserver.html

Server:
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Apache Struts
Apache Tiles

Jetty as the servelet container