the work java spring does is not caused by the language feature limitations of java. so python should need something similar, but why didn t it develop? ...
Spring boot uses jpa to operate MySQL InnoDB; for example: products; id; quantity; ; id=3211: I see the sql statement on the Internet is: SET AUTOCOMMIT=0; BEGIN WORK; SELECT quantity FROM products WHERE id=3 FOR UPDATE; UPDATE products SET quan...
requirements: http: localhost:80 order service?method=getTradeInfo http: localhost:80 order service?method=createTrade requires method to decide which method to map to which controller, and how should it be implemented? now only knows that spring...
and input parameters use @ RequestBody annotations ...
try to compile the simplest Spring program: Main.java import org.springframework.beans.factory.BeanFactory; import org.springframework.context.support.ClassPathXmlApplicationContext; public class Main { private String who = null; public...
start the service center first, and then start the web project. This error will appear on the figure: : ...
error prompt: 08-Apr-2018 22:43:20.746 [RMI TCP Connection(2)-127.0.0.1] org.springframework.web.context.ContextLoader.initWebApplicationContext Context initialization failed org.springframework.beans.factory.BeanCreationException: Error creating bea...
there is a problem that I can t solve when I just learned ssm,. No, no, no. The directory structure is as follows error message: Caught exception while allowing TestExecutionListener [org.springframework.test.context.support.DependencyInjectionTes...
package structure is as follows: com.xxx.xxx.package1 com.xxx.xxx.package2 com.xxx.xxx.package3 com.xxx.xxx.common.package1 . each package has an independent controller,service,repository, etc. tested in Spring Boot and JUnit5 environments, @ Com...
1.springboot project structure is shown in the figure 2.UploadControllerimages "templates images ", ". main resources templates images " url: ...
problem description: the front end invokes a service An at the back end, and this service A contains the sub-service BMagne C * C * C has its own independent transaction mechanism and does not affect each other. After is executed, the final return fro...
questions about parsing parameters in request and putting them back in request get and post follow the method , parsing is normal, but an exception is thrown when a put request is encountered. put requests request of spring , while tomc...
tomcat can be accessed normally at the beginning, but after a week or two of operation, it cannot be accessed normally, and it does not report an error, but it just cannot be accessed, which is very strange. jdk and tomcat are both 32-bit, is that the r...
one class @Entity public class Shuo{ @Id @GeneratedValue private int id; private String title; private Date date; String content; @ManyToOne(cascade = CascadeType.REFRESH) @JoinColumn(name = "user_id") private User user; : @OneT...
when I actually use it, it s not what the documentation says. my thymeleaf version The code calls the tostring method of the class in this way <script> console.log([[${games}]]) < script> chorme console: an error will be prompted, b...
thymeleaf 2.+ requires < script th:inline= "javascript " > declare this Is there a better way after thymeleaf3? can the declaration be omitted? I read the document saying that it is recommended to remove . Template updates remove any th:inline= ...
novice to java, see that part of the pom of a project looks like this: <dependency> <groupId>org.springframework< groupId> <artifactId>spring-web< artifactId> <version>${springframework.version}< ver...
there is a set collection of tag classes in the user class; maintain relationships only from the user class, one-to-many @ OneToMany @JoinTable(name="shuo_tag", inverseJoinColumns=@JoinColumn(name="tag_id"), jo...
when the front and rear ends are separated, the front end provides API access to the data through the back end, but this is achieved through @ API, that is, giving the front end a URL, if there is a folder of static resources in the back-end project, how...
@Bean public HttpMessageConverters fastJsonHttpMessageConverters() { 1convert FastJsonHttpMessageConverter fastConverter = new FastJsonHttpMessageConverter(); 2fastjsonjson; FastJsonConfig fastJsonConfig = new Fast...
problem description how to partition a removable hard disk under windows so that one partition retains the original file, one partition is written to the linux installation image, and one partition installs the linux system using the image in the prev...
simple development instance HTTP protocol is normal, WebSocket protocol error is not recorded in "client connection failure reason " WebSocket connection to ws: 127.0.0.1:2000 failed: Connection closed before receiving a handshake response ...
as shown in the figure: delete a group on the grouping page, then click on the device management page, or click back to the previous page (device management page) this needs to be refreshed. If the grouping page does nothing, jump to the device man...
I python novice, when flipping through pep484 , and mypy , I encountered something I didn t understand, as follows: -sharp Construct an empty Stack[int] instance stack = Stack[int]() stack.push(2) stack.pop() stack.push( x ) -sharp Type error m...
do a rich text editor related project, using the Quill editor, and then found that the content with picture and text uploaded to the server, returned to me in the data, is the tag plus image base64. then put it in state and display it on the page,...