Today I find an issue when running a Spring Boot web application: the web app generates logging files at the “/tmp” directory which consumes a lot of storage. I didn’t set this. Why?

I have used Octopress for my blog from 2011. It’s been a while that I want to switch my blogging system from Octopress to something else. This is finally done now: I switched my blog from Octopress to Hexo in the recent days. What you see now is generated by Hexo instead of Octopress.

Here are some useful tips when using “htop”.

In IntelliJ IDEA I get this warning message regarding the “@Autowired” field: “Field injection is not recommended”. Why?

Using SSH public key anthentication makes the SSH login process securer and easier, that you don’t need to remember the password.

From here.

It seems by default CentOS doesn’t allow network be accessed from outside. Here are the instructions how to make it work on CentOS 7. From here and here.

Today I got an error when running a Java application on a new CentOS server:

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SunCertPathBuilderException: unable to find valid certification path to requested target

Here is the solution.

From here and here.