Spring | 易学教程

BindException thrown instead of MethodArgumentNotValidException in REST application

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问题 I have a simple Spring Rest Controller with some validation. My understanding is that validation failures would throw a MethodArgumentNotValidException. However, my code throws a BindException instead. In debug messages, I also see the app returning a null ModelAndView. Why would a Rest Controller throw BindException or return a null ModelAndView? Note: I am testing my web application using curl and making an HTTP POST curl -X POST http://localhost:8080/tasks I am intentionally omitting the

Spring JPA REST sort by nested property

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问题 I have entity Market and Event . Market entity has a column: @ManyToOne(fetch = FetchType.EAGER) private Event event; Next I have a repository: public interface MarketRepository extends PagingAndSortingRepository<Market, Long> { } and a projection: @Projection(name="expanded", types={Market.class}) public interface ExpandedMarket { public String getName(); public Event getEvent(); } using REST query /api/markets?projection=expanded&sort=name,asc I get successfully the list of markets with

WebSocket Stomp over SockJS - http custom headers

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问题 I'm using stomp.js over SockJS in my javascript client. I'm connecting to websocket using stompClient.connect({}, function (frame) { stomp over sockJS connection has 2 http requests: request to /info http upgrade request the client sends all cookies. I would like to also send custom headers (e.g. XSRF header) but didn't find a way to do that. Will appreciate any help. 回答1: @Rohitdev So basically you can't send any HTTP headers using stompClient, because STOMP is layer over websockets, and

常问的22道Java面试题，值得收藏【文末送书】

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作者：爱茹一婉年原文： https : //blog.csdn.net/qq_21924011/article/details/80399836 1）集合类：List和Set比较，各自的子类比较（ArrayList，Vector，LinkedList；HashSet，TreeSet） List：元素是有顺序的，元素可以重复因为每个元素有自己的角标（索引） |-- ArrayList:底层是数组结构，特点是：查询很快，增删稍微慢点，线程不同步：A线程将元素放在索引0位置，CPU调度线程A停止，B运行，也将元素放在索引0位置，当A和B同时运行的时候Size就编程了2. |-- LinkedList：底层使用的是链表数据结构，特点是：增删很快，查询慢。线程不安全，线程安全问题是由多个线程同时写或同时读写同一个资源造成的。 |--Vector:底层是数组数据结构，线程同步，Vector的方法前面加了synchronized关键字，被ArrayList代替了，现在用的只有他的枚举。 Set：元素是无序的，且不可以重复（存入和取出的顺序不一定一致），线程不同步。set底层是使用Map实现的，故可以通过ConcurrentHashMap的方式变通实现线程安全的Set。 |--HashSet：底层是哈希表数据结构。根据hashCode和equals方法来确定元素的唯一性。

Custom WebSecurityConfigurerAdapter

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问题 I have this problem implementing a custom login authentication using SpringBoot and SpringBoot-Security. I made a Bitbucket repository as reference for this thread (within CustomSecuringWeb branch). Before anything else, most of the comments here follows the Securing a Web Application tutorial. The thing is, I was curious as how could the authentication data is now from the database instead of just memory data (which is very common in production line applications). Throughout the process I

Thymeleaf + spring dynamic replace

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问题 Is it possible to create a dynamic replace in Thymeleaf? I have the following controller: @Controller public class LoginController { @RequestMapping("/login") public String getLogin(Model model){ model.addAttribute("template","login"); return "index"; } } And the following view: <!DOCTYPE html> <html xmlns:th="http://www.thymeleaf.org" > <head></head> <body> <div th:replace="fragments/${template} :: ${template}"></div> </body> </html> And i'm getting the following error: Error resolving

Thymeleaf + spring dynamic replace

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Spring configuration properties metadata json for nested list of Objects

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问题 How does one configure spring configuration metadata json for nested list of objects? Scenario @ConfigurationProperties(prefix = "custom-config") public class ConfigProperties { private boolean booleanProperty; private List<NestedObject> listProperty = new LinkedList<>(); //getters and setters } public class NestedObject { private String stringProperty; private boolean booleanProperty; //getters and setters } This is what was auto generated in the metadata json { "groups": [{ "name": "custom

事务特性,事务的隔离级别,并发事务可能出现的问题,spring事务数据库锁

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1.0 事务特性(ACID) Atomicity：原子性，一个事务不可以被拆分 Consistency：一致性，在事务执行前数据库的数据处于正确的状态，而事务执行完成后数据库的数据还是处于正确的状态，即数据完整性约束没有被破坏；比如我们做银行转账的相关业务，A转账给B，要求A转的钱B一定要收到。如果A转了钱而B没有收到，那么数据库数据的一致性就得不到保障，在做高并发业务时要注意合理的设计。 Isolation：隔离性，并发事务执行之间无影响，在一个事务内部的操作对其他事务是不产生影响，这需要事务隔离级别来指定隔离性； Durability：持久性，事务一旦执行成功，它对数据库的数据的改变必须是永久的，不会因各种异常导致数据不一致或丢失。 1.1 事务的隔离级别　　READ_UNCOMMITTED 会出现脏读、不可重复读、幻读 ( 隔离级别最低，并发性能高 ) 　　READ_COMMITTED 会出现不可重复读、幻读问题（锁定正在读取的行）　　REPEATABLE_READ 会出幻读（锁定所读取的所有行）　　SERIALIZABLE 保证所有的情况不会发生（锁表）大多数数据库的默认隔离级别为: Read Commited,如Sql Server , Oracle . 少数数据库默认的隔离级别为Repeatable Read, 如 MySQL InnoDB存储引擎 1

国产微服务网关-Soul(真香)

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What is the Soul？一个异步的,高性能的,跨语言的,响应式的API网关。我希望能够有一样东西像灵魂一样，保护您的微服务。参考了Kong，Spring-Cloud-Gateway等优秀的网关后，站在巨人的肩膀上，Soul由此诞生！是不是很吊的一句话，站在巨人身上那么这些巨人也就变成了矮子。整体架构如下图所示：是不是很炫反正我是没看懂部署单机版操作在windows环境安装SoulAdmin souladmin:控制台，负责维护网关的元数据、配置等等，并提供给 SoulBootstrap 网关服务读取。在mysql数据库中执行下面图中sql，12张表在浏览器输入 https://yu199195.github.io/jar/soul-admin.jar 回车下载即可，yml文件复制一份在外部启动，用自己的数据库启动命令：java -jar soul-admin.jar --spring.config.location=xxxxx\application-local.yml 启动成功后通过日志看到 Soul Admin 启动在 9095 端口。使用浏览器，访问 http://127.0.0.1:9095/ 地址，进入登录页,账号密码分别是：admin 和123456 安装SoulBootstrap SoulBootstrap：网关服务，负责启动网关

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