udemy spring boot course

When we are doing Web applications, it is very common for errors to occur during request processing. Spring Boot provides a default mapping: When an exception is thrown in processing, it is /error forwarded to the request for processing, and the request has a global error page to display the exception content.Choose a previously implemented web App (Chapter3-1-2) to start the app, access a nonexistent URL,

A: PrefaceOften at the time of development, the configuration files in the project, in the personal development of a set of configuration files, a set of configuration files in the test environment, a set of configuration files in the formal environment, this time if the configuration file complex, need to change a lot of things, and because of the iterative process, it is necessary to switch frequently, problems inevitably occur.Two: the solution of SpringbootIn fact, the preparation should be

ObjectiveIt's been a long time since the last one, and the project has started. And, because of the online on the spring boot websocket explanation is also more. So I used another communication framework T-io to implement the communication function in Layim. This article will focus on the parts of the pits and the time spent comparing my research and development process.WebSocketIn the study of T-io , I hav

Web sites under the recommended template engine. Spring Boot provides the default configuration of the template engine mainly as follows: Thymeleaf freemarker Velocity Groovy Mustache Spring Boot recommends using these template engines to avoid using JSPs, and it will not be possible to implement the many features of

--Initial articleEnd of the short semester of the course, the initial study of the SSM framework, with these learned knowledge to complete the short term task-----ordering system.I learned spring boot from my seniors, and I heard about Spring cloud, but spring

serializing an object using JSON, an infinite recursive (Infinite recursion) error is generated. Here are 2 workarounds:A. Use @jsonignore below the @manytoone.B. Use @jsonmanagedreference below @onetomany and use @jsonbackreference under @manytoone@JsonBackReference and @jsonmanagedreference: @JsonBackReference labeled properties are ignored when serialized (serialization). Attributes that are @JsonManagedReference labeled are serialized. When serializing, the function of the @JsonBackReferenc

these dependencies do not need? Of course not, here we in order to streamline (install force), used to webjars,webjars the commonly used Third-party JS Plug-ins and class library packaged into the form of a jar package, we can refer to the way the jar package to reference the third party JS plug-in first to configure dependencies, the official support of a variety of build tools maven, Gradle Wait, here we use the Maven method Xml Quote words Html

Today, when I visited the Spring Boot Actuator Monitor page, I did not see the error, which means that I did not have access Then I looked at the console and found useful information. Say Access endpoint information requires authentication, set management.security.enabled to False to turn off the validation feature 2017-11-07 14:13:19.742 INFO 11232---[nio-2101-exec-1] s.b.a.e.m.mvcendpointsecurityinterc

It 's written in front . This demo shows how to troubleshoot a @transactional-induced nullpointerexception. Https://github.com/hengyunabc/spring-boot-inside/tree/master/demo-Transactional-NullPointerException Positioning NullPointerException's Code Demo is a simple spring transaction example that provides one of the following Studentdao and declares the transact

I. Introduction of the Project (demo)MU-Class network ... Hit three words, or not introduced to avoid advertising. A simple crawler for this site's demo.Address: Https://www.imooc.com/course/list?c=springbootII. structure of the projectProject Multilayer Architecture: Common layer, controller layer, entity layer, repository layer, because the demo is relatively simple there is no subdivision so much (lazy).　　Iii. Description of the projectF12 view the

Shrio official website :https://shiro.apache.org/Apache Shiro is a powerful and easy-to-use Java security framework that performs authentication, authorization, encryption, and session management. with Shiro's easy-to-understand API, you can quickly and easily protect any application-from the smallest mobile app to the largest Web and enterprise application. Spring also comes with its own security framework. Shrio is through its re-encapsulation, re

This is the second week of Learning Spring boot, the company claims that this thing is not what the novice can fill in the blanks to develop, so decided to get started, how to say I have been engaged for almost seven or eight years. NET and. Netcore, did not think ruthless face, quickly by this can fill the open the IDE crazy, the following is to write down some of their own pit development encountered a se

Believe that most of the students who use IntelliJ will encounter this problem, even if the project used Spring-boot-devtools, modified class or HTML, JS, and so on, idea or will not automatically restart, to make a manual or restart,There is no use for hot deployment. This is not your configuration problem, believe yourself, the hot deployment of the few settings is simple, the root cause is because Intell

distributed RESTful Service video tutorial First set:billions of traffic e-Commerce Details page System combat-cache Architecture + high-Availability service architecture + MicroServices Architecture (first edition)Second set:billions of traffic e-Commerce Details page System combat-cache Architecture + high-Availability service architecture + MicroServices Architecture (second edition)The third set:Elaticsearch Video Two sets-full version (core and advanced step)Elasticsearch Top Master Series

Spring Boot Filter Implementation1. Direct configuration of annotation mode@Component @servletcomponentscan@webfilter (urlpatterns = "/*", FilterName = "Loginfilter") public class Loginfilter Implements filter{}1, @Component The purpose of this annotation is to give loginfilter to the container to handle. Which means that loginfilter works.2, @ServletComponentScan This use to scan @webfilter let @webfilter

caused by: org.springframework.beans.factory.NoUniqueBeanDefinitionException: No qualifying Bean of type [ So.dian.dev.device.interfaces.IDeviceInfoSV] is defined:expected single matching beans but found 2:deviceinfosvimpl, IDEVICEINFOSV At org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency ( defaultlistablebeanfactory.java:1126) At org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency ( defaultlistablebeanfactory.java:10