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The Problem When using AWS RDS Proxy for PostgreSQL for the first time, I see many pieces of the following logs Consider moving session configuration to the proxy’s initialization query. Digest: “set extra_float_digits = $1”. and The client session was pinned to the database connection [dbConnection=2678093940] AWS said RDS Prox...

Overview Regular Expression is good in many cases like log analysis, and quick searching etc. However, 9 out of 10 Regular Expressions are not correct when they are used for specific business purpose in my working experience, such as the email address validation. It’s good to learn basic Regular Expression, while it’s more important to know the...

What is NullPointerException (NPE) null is a reserved value for indicating that the pointer does not refer to a valid object. In Java, access of null will trigger NullPointerException. The history of null dates back to 1965, Tony Hoare (known for Quicksort) introduced null references in an object oriented language. In 2009 at a conference, he a...

Overview The most ‘fantastic’ usage of exception in Java I saw around 3 years ago is, a guy throws Exception in an inner loop in order to exit the outer loop. Exception is fundamental knowledge in Java. However, someone analyzed half a million Java projects in GitHub, the result shows the usage is not good.[1]

Overview Weekly report is usually used for task/project in an organization, the objectives include For the organization Help monitor and control the task/project Improve communication in the organization and keep stakeholders informed Gain more organizational support for the task/project For the reporter ...

Purpose Look at the file names untitled.txt lib.zip 123.doc tmp.txt myidea.txt Even if we can remember the content of the files temporarily, we will forget soon. A good file naming convention is good for organizing and retrieving our documents efficiently.