Programmer Think

1. The cause of circular dependency - injected through the constructor Let's define two interdependent bean s (injected through the constructor): @Component public class CircularDependencyA { private CircularDependencyB circB; @Autowired public CircularDependencyA(CircularDependencyB circ ...

What is Nacos Nacos is one of the important components in Spring Cloud Alibaba ecosystem, which is used to discover, configure and manage microservices. Nacos provides a set of simple and easy-to-use feature sets, which can quickly realize dynamic service discovery, service configuration, service meta ...

brief introduction In the previous article, QQ login is completed. Generally, if the current QQ login user is not registered in our database, he should skip to the registration binding page. If we do not configure the jump page, he will jump to / signup by default Source code analysis Enter social authentication filter private Authenti ...

The SpringCloud backend intercepts front-end requests, which are logging, using SpringAOP, which is face-to-face. First, intercept the request address (ip), using the Handler Interceptor Adapter, which intercepts the request address, so it is appropriate to do some validation and preprocessing for the request address. For example, below, I use ...

In fact, I have always been used to build projects with maven, but yesterday I downloaded the source code of spring, and others have switched to gradle, and then I will simply learn the gradle, a typical application driven learning, and learn what new content I need The short tutorial is as follows: ...

9.1 overview In the part of Class file format and execution engine, there are not too many contents directly affected by the user's program. How to store the Class file, when to load the Class, how to connect it, and how the virtual machine can execute bytecode instructions are all directly controlled by the virtual machine. The main functions ...

About what tymeleaf is: 1.Thymeleaf is a popular template engine, which is developed in Java language. In addition to thmeleaf, there are template engines such as Velocity and FreeMarker, with similar functions. 2.Thymeleaf can run in the environment with and without network, that is to say, it allows ...

Apache Commons Logging(JCL) provides a simple log abstraction that allows developers to use specific log implementations. JCL can use other log implementations, including Log4J, Avalon LogKit(Avalon's log framework), and JDK logging(JUL). This paper mainly introduces the simple use of JCL, the software version used in this paper: Java 1.8.0, co ...

Write before SpringBoot is easy to create projects, and data access throws away a lot of tedious configuration. In the previous series of blogs, I've taught you how to use SpringBoot for data access. It talks about integrating JDBC, MyBatis, and JPA.In my own actual development, I am more used to usin ...

All the way to learn Java is like stepping on a hole. Come and let's count my blood and tears over the years Rookie stage, spend almost every day on thunder... First: the database table field cannot use sql field, and a 500 error will be reported. For example, the order will report an error when select ing. Second: when using int type for ...