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Category: Java

Logging configuration for Spring Boot (logback)

logWhen you start a project, you usually do not care about logging. Necessary information is printed to the console by default. That is usually enough for development but when you want to go with it to production, logging has to be configured. There are a few Java libraries that can handle logging like java.util.logging, Logback, Log4j, Jakarta Commons Logging. When you create a project based on Spring Boot Web Starter, Logback is added by default.

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Category: Java

Cannot find ServletContextInitializer

springIf you are upgrading to Spring Boot 1.5, you may notice that some classes, methods and properties were removed. One of them is ServletContextInitializer that was used to configure Java Servlet context. It was an interface and was available in Spring Boot 1.4 but it was marked as deprecated. It disappeared with the upgrade. See how it can be replaced.

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Category: Java

Google and Facebook login in one application

google facebookIf you want to avoid maintaining a users database and creating a custom authentication based on a login form, you should consider OAuth2 and their 3rd party providers. Your users will be able to log in with their social accounts. That is great for them as they do not need to remember new passwords and for other various reasons. Some of them are described in What is OpenID, OAuth2 and Google Sign In?

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Category: Java

Module xyz reads package org.apache.commons.logging from both commons.logging and jcl.over.slf4j

modulesWhen I tried to migrate one of my projects to Java 9 and modules, I encountered this error - module xyz reads package org.apache.commons.logging from both commons.logging and jcl.over.slf4j. As this package (org.apache.commons.logging) is very popular, it might happen to you also. That is why I want to share with you some background of this issue and a solution that worked for me.

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Category: Java

Getting started with Single Sign On with Facebook in Spring Boot app If a web application requires signing in, there are two options. The first one is to create and maintain a users database on your own. It has some disadvantages like additional work, registering a database of personal information etc. The second option is to use one of external authenticators like Google Sign-In. Integrating a web application based on Spring Boot with Google Sign-In is easy. Let me show it to you step by step.

facebookIf a web application requires signing in, there are two options. The first one is to create and maintain a users database on your own. It has some disadvantages like additional work, registering a database of personal information etc. The second option is to use one of external authenticators like Facebook Single Sign On. Integrating a web application based on Spring Boot with Facebook is easy. Let me show it to you step by step.

 

  1. Scheduling tasks in Spring
  2. Java Influencers about Project Jigsaw
  3. Testing for exceptions in Spock
  4. Using @ControllerAdvice to handle @Controller exceptions globally
  5. Use the built-in formatting to construct this argument.
  6. Testing arguments of method execution with Spock Framework
  7. Google Sign-In with Spring Security (no Spring Boot)
  8. Google profile details in Spring Boot application
  9. Getting started with Google Sign-In in Spring Boot app
  10. Basics of mutable and immutable classes
  11. Story of LazyInitializationException
  12. Lombok - solution for getter and setter boilerplate code
  13. Enabling H2 db in Spring Boot app
  14. Spring Boot application deployment on standalone Tomcat
  15. How to mock static methods
  16. JDBC connection strings and drivers
  17. Getting C/C++ performance out of Java