Easily secure your Spring Boot applications with Keycloak

https://developers.redhat.com/blog/2017/05/25/easily-secure-your-spring-boot-applications-with-keycloak/

How to use JPA correctly to avoid complaints of a slow application

https://zeroturnaround.com/rebellabs/how-to-use-jpa-correctly-to-avoid-complaints-of-a-slow-application/

Modified Java Script Value & Dynamic SQL

https://stackoverflow.com/questions/36918706/pentaho-insert-a-list-in-sql-where-clause

Spring Batch With Spring Boot

http://ashismo.github.io/java-spring/2017/05/16/Spring-Batch-with-Spring-Boot

Java Generic Type & get-put principle

https://stackoverflow.com/questions/1292109/explanation-of-the-get-put-principle

Java 8: java.time.*

https://www.mkyong.com/spring-boot/spring-boot-spring-data-jpa-java-8-date-and-time-jsr310/

RRD Tool

http://www.study-area.org/tips/rrdtool/rrdtool.html

http://ycfu.blog.mypc.tw/2008/05/rrdtool.html

http://blog.csdn.net/jndxjing/article/details/8014410