Idea version: 2020, JDK version: 11
Use Maven to import other springboot modules, modify the JDK and compiler of the module to 11, and run with an error:
(original JDK version of this module: 1.8, spring boot starter parent version 2.5.0 in POM file)
Solution:
Modify the version of spring boot starter parent in POM file to 2.6.7 (or other suitable version) and run successfully.
Possible causes of error:
Version mismatch……
“status“:405,“error“ Request method ‘POST‘ not supported“
Error Messages:
-“status”:405,“error”:“Method Not Allowed”,“exception”:“org.springframework.web.HttpRequestMethodNotSupportedException”,“message”:“Request method ‘POST’ not supported”
code:
@Controller
public class EmpController {
@Autowired
private EmpService empService;
@GetMapping("/empadd")
public String empAdd(Model model) {
model.addAttribute("list",empService.showAll());
return "emp-add";
}
@PostMapping("/add")
public String add(Emp emp, MultipartFile file){
empService.insert(emp,file);
return "emp-add";
}
}
Reason:
As it says in the Spring REST guide,
@RequestMapping maps all HTTP operations by default
but if, as they suggest, you added a specification of the allowable http methods:
@RequestMapping(method=GET)
then only GETs will be allowed. POSTs will be disallowed.
If you want to allow both GET and POST, but disallow all other http methods, then annotate your controller method thusly:
@RequestMapping(value = "/greeting", method = {RequestMethod.GET, RequestMethod.POST})
public Greeting greeting(@RequestParam(value="name", defaultValue="World") String name) {
return new Greeting(counter.incrementAndGet(),
String.format(template, name));
}
When you start the application, all the request handler mappings are logged out. You should see a line like this in your log (in the IDE console or command line window):
s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/greeting],methods=[GET || POST]}" onto public hello.Greeting hello.GreetingController.greeting(java.lang.String)
Solution:
Modify
@GetMapping("/empadd")
to
@RequestMapping("/empadd")Problems encountered
Module build failed (from .de_modules/babel-loaderb/index.js):
SyntaxError: E:\IdeaProjects\
springboot_vue\src\main.js: Identifier 'ElementPlus' has already been declared. (8:7)
Solution:
by checking the project source code, it is found that the reason for this error is that elementplus has been imported twice. The solution is to delete one!
The effects after the solution are as follows:
Summary
As a back-end R & D personnel, I think it is necessary to have a little understanding of the front-end. Although I may not take the road of R & D in the future, I feel that with the existence of the epidemic, the reduction of Posts and the improvement of academic qualifications, the internal volume may become more and more serious, and the iron still needs to be hard! Choose a road and stick to it. At least the result won’t be too bad. Come on~
When I double click activemq.bat to start MQ and reports the following error,
The reason is caused by insufficient memory. You can use Ctrl + Alt + Del –> Task manager, close some process tasks to make room, and then start again
Solution:
Method 1:
There may be other similar situations, which may also be caused by the non rent of memory
For example, the error of starting Kafka package in the following figure: Java HotSpot(TM) 64-Bit Server VM warning: INFO: os::commit_memory(0x00000000c0000000, 1073741824, 0) failed; error=’The page file is too small and it can be operated.’ (DOS error/errno=1455)
Through the method agreed above, you can start successfully 
Method 2:
Notice:
1. Error prompt
java.lang.NoSuchMethodError: javax.servlet.http.HttpServletRequest.getHttpServletMapping()Ljavax/servlet/http/HttpServletMapping;
2. The reason is that the Tomcat version is incompatible with springboot
I use
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.3.10.RELEASE</version>
</parent>
2. The solution is to modify the below codes in pom.xml
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.3.10.RELEASE</version>
</parent>
to:
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.5.RELEASE</version>
</parent>
Problem-solving
IDEA springboot startup error:
java.lang.UnsatisfiedLinkError: no tcnative-1 in java.library.path: [D:\Java\bin, C:\Windows\Sun\Java\bin, C:\Windows\system32, C:\Windows, C:\Program Files\Common Files\Oracle\Java\javapath, C:\Windows\system32, C:\Windows, C:\Windows\System32\Wbem, C:\Windows\System32\WindowsPowerShell\v1.0\, C:\Windows\System32\OpenSSH\, D:\java\bin, ;D:\tomcat\apache-tomcat-10.0.14\bin;D:\tomcat\apache-tomcat-10.0.14\lib, D:\apache-maven-3.8.4\bin, D:\Xshell\, D:\5.1, D:\5.1\clibs, C:\Users\cqb\AppData\Local\Microsoft\WindowsApps, ., .] at java.base/java.lang.ClassLoader.loadLibrary(ClassLoader.java:2660) ~[na:na] at java.base/java.lang.Runtime.loadLibrary0(Runtime.java:827) ~[na:na] at java.base/java.lang.System.loadLibrary(System.java:1871) ~[na:na] at org.apache.tomcat.jni.Library.<init>(Library.java:69) ~[tomcat-embed-core-9.0.46.jar:9.0.46] at org.apache.tomcat.jni.Library.initialize(Library.java:206) ~[tomcat-embed-core-9.0.46.jar:9.0.46] at org.apache.catalina.core.AprLifecycleListener.init(AprLifecycleListener.java:193) ~[tomcat-embed-core-9.0.46.jar:9.0.46] at org.apache.catalina.core.AprLifecycleListener.isAprAvailable(AprLifecycleListener.java:102) ~[tomcat-embed-core-9.0.46.jar:9.0.46] at org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory.getDefaultLifecycleListeners(TomcatServletWebServerFactory.java:173) ~[spring-boot-2.5.1.jar:2.5.1] at org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory.<init>(TomcatServletWebServerFactory.java:120) ~[spring-boot-2.5.1.jar:2.5.1] at org.springframework.boot.autoconfigure.web.servlet.ServletWebServerFactoryConfiguration$EmbeddedTomcat.tomcatServletWebServerFactory(ServletWebServerFactoryConfiguration.java:76) ~[spring-boot-autoconfigure-2.5.1.jar:2.5.1] at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na] at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:na] at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na] at java.base/java.lang.reflect.Method.invoke(Method.java:566) ~[na:na] at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:154) ~[spring-beans-5.3.8.jar:5.3.8] at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:653) ~[spring-beans-5.3.8.jar:5.3.8] at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:638) ~[spring-beans-5.3.8.jar:5.3.8] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1334) ~[spring-beans-5.3.8.jar:5.3.8] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1177) ~[spring-beans-5.3.8.jar:5.3.8] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:564) ~[spring-beans-5.3.8.jar:5.3.8] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:524) ~[spring-beans-5.3.8.jar:5.3.8] at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335) ~[spring-beans-5.3.8.jar:5.3.8] at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-5.3.8.jar:5.3.8] at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333) ~[spring-beans-5.3.8.jar:5.3.8] at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:213) ~[spring-beans-5.3.8.jar:5.3.8] at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.getWebServerFactory(ServletWebServerApplicationContext.java:217) ~[spring-boot-2.5.1.jar:2.5.1] at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.createWebServer(ServletWebServerApplicationContext.java:180) ~[spring-boot-2.5.1.jar:2.5.1] at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.onRefresh(ServletWebServerApplicationContext.java:160) ~[spring-boot-2.5.1.jar:2.5.1] at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:577) ~[spring-context-5.3.8.jar:5.3.8] at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:145) ~[spring-boot-2.5.1.jar:2.5.1] at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:754) ~[spring-boot-2.5.1.jar:2.5.1] at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:434) ~[spring-boot-2.5.1.jar:2.5.1] at org.springframework.boot.SpringApplication.run(SpringApplication.java:338) ~[spring-boot-2.5.1.jar:2.5.1] at org.springframework.boot.SpringApplication.run(SpringApplication.java:1343) ~[spring-boot-2.5.1.jar:2.5.1] at org.springframework.boot.SpringApplication.run(SpringApplication.java:1332) ~[spring-boot-2.5.1.jar:2.5.1] at cn.com.buba.SpringbootDemoApplication.main(SpringbootDemoApplication.java:10) ~[classes/:na] 2022-05-03 14:45:28.909 INFO 6716 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8080 (http) 2022-05-03 14:45:28.916 INFO 6716 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat] 2022-05-03 14:45:28.916 INFO 6716 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet engine: [Apache Tomcat/9.0.46] 2022-05-03 14:45:28.973 INFO 6716 --- [ main] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext 2022-05-03 14:45:28.973 INFO 6716 --- [ main] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 575 ms 2022-05-03 14:45:29.193 INFO 6716 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 8080 (http) with context path '' 2022-05-03 14:45:29.200 INFO 6716 --- [ main] cn.com.buba.SpringbootDemoApplication : Started SpringbootDemoApplication in 1.1 seconds (JVM running for 1.953)
Solution:
-Djava.library.path=/usr/local/java/lib:/usr/local/hadoop/lib
Unable to register due to connection using local network.
Error reporting information:
address: http://192.168.x.xxx:9999/ code: 500 msg: xxl-rpc remoting error(connect timed out), for url: http://192.168.x.xxx:9999/run
Solution:
1. Change automatic registration to manual registration
2. Use intranet penetration tool
3. Fill in the manually registered address as the address of Intranet penetration
Solution:
Add (exclude = {DataSourceAutoConfiguration.class})
after @SpringBootApplication of the main startup class to exclude autoconfig of this class:
@SpringBootApplication(exclude = {DataSourceAutoConfiguration.class})
You can start successfully~
Project scenario:
use bat to execute java to start the springboot project in a flash
Problem description
the background log displays the following information
2022-04-25 17:35:27.845 [main] ERROR org.springframework.boot.SpringApplication -Application run failed
org.springframework.beans.factory.BeanDefinitionStoreException: Failed to read candidate component class: URL [jar:file:/G:/2022/admin/lib3/yy-common-1.1.jar!/com/yy/config/RemoveDruidAdConfig.class]; nested exception is java.lang.IllegalStateException: Could not evaluate condition on com.yy.config.RemoveDruidAdConfig due to org/springframework/boot/bind/RelaxedPropertyResolver not found. Make sure your own configuration does not rely on that class. This can also happen if you are @ComponentScanning a springframework package (e.g. if you put a @ComponentScan in the default package by mistake)
at org.springframework.context.annotation.ClassPathScanningCandidateComponentProvider.scanCandidateComponents(ClassPathScanningCandidateComponentProvider.java:457)
at org.springframework.context.annotation.ClassPathScanningCandidateComponentProvider.findCandidateComponents(ClassPathScanningCandidateComponentProvider.java:316)
at org.springframework.context.annotation.ClassPathBeanDefinitionScanner.doScan(ClassPathBeanDefinitionScanner.java:276)
at org.springframework.context.annotation.ComponentScanAnnotationParser.parse(ComponentScanAnnotationParser.java:128)
at org.springframework.context.annotation.ConfigurationClassParser.doProcessConfigurationClass(ConfigurationClassParser.java:296)
at org.springframework.context.annotation.ConfigurationClassParser.processConfigurationClass(ConfigurationClassParser.java:250)
at org.springframework.context.annotation.ConfigurationClassParser.parse(ConfigurationClassParser.java:207)
at org.springframework.context.annotation.ConfigurationClassParser.parse(ConfigurationClassParser.java:175)
at org.springframework.context.annotation.ConfigurationClassPostProcessor.processConfigBeanDefinitions(ConfigurationClassPostProcessor.java:331)
at org.springframework.context.annotation.ConfigurationClassPostProcessor.postProcessBeanDefinitionRegistry(ConfigurationClassPostProcessor.java:247)
at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanDefinitionRegistryPostProcessors(PostProcessorRegistrationDelegate.java:311)
at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:112)
at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:746)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:564)
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:145)
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:730)
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:412)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:302)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1301)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1290)
at com.yy.YyApplication.main(YyApplication.java:18)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.springframework.boot.loader.MainMethodRunner.run(MainMethodRunner.java:49)
at org.springframework.boot.loader.Launcher.launch(Launcher.java:108)
at org.springframework.boot.loader.Launcher.launch(Launcher.java:58)
at org.springframework.boot.loader.PropertiesLauncher.main(PropertiesLauncher.java:467)
Caused by: java.lang.IllegalStateException: Could not evaluate condition on com.yy.config.RemoveDruidAdConfig due to org/springframework/boot/bind/RelaxedPropertyResolver not found. Make sure your own configuration does not rely on that class. This can also happen if you are @ComponentScanning a springframework package (e.g. if you put a @ComponentScan in the default package by mistake)
at org.springframework.boot.autoconfigure.condition.SpringBootCondition.matches(SpringBootCondition.java:55)
at org.springframework.context.annotation.ConditionEvaluator.shouldSkip(ConditionEvaluator.java:108)
at org.springframework.context.annotation.ConditionEvaluator.shouldSkip(ConditionEvaluator.java:88)
at org.springframework.context.annotation.ConditionEvaluator.shouldSkip(ConditionEvaluator.java:71)
at org.springframework.context.annotation.ClassPathScanningCandidateComponentProvider.isConditionMatch(ClassPathScanningCandidateComponentProvider.java:512)
at org.springframework.context.annotation.ClassPathScanningCandidateComponentProvider.isCandidateComponent(ClassPathScanningCandidateComponentProvider.java:495)
at org.springframework.context.annotation.ClassPathScanningCandidateComponentProvider.scanCandidateComponents(ClassPathScanningCandidateComponentProvider.java:430)
... 28 common frames omitted
Caused by: java.lang.NoClassDefFoundError: org/springframework/boot/bind/RelaxedPropertyResolver
at org.springframework.boot.autoconfigure.condition.OnPropertyCondition$Spec.collectProperties(OnPropertyCondition.java:154)
at org.springframework.boot.autoconfigure.condition.OnPropertyCondition$Spec.access$000(OnPropertyCondition.java:117)
at org.springframework.boot.autoconfigure.condition.OnPropertyCondition.determineOutcome(OnPropertyCondition.java:99)
at org.springframework.boot.autoconfigure.condition.OnPropertyCondition.getMatchOutcome(OnPropertyCondition.java:60)
at org.springframework.boot.autoconfigure.condition.SpringBootCondition.matches(SpringBootCondition.java:47)
... 34 common frames omitted
Caused by: java.lang.ClassNotFoundException: org.springframework.boot.bind.RelaxedPropertyResolver
at java.net.URLClassLoader.findClass(URLClassLoader.java:382)
at java.lang.ClassLoader.loadClass(ClassLoader.java:418)
at org.springframework.boot.loader.LaunchedURLClassLoader.loadClass(LaunchedURLClassLoader.java:151)
at java.lang.ClassLoader.loadClass(ClassLoader.java:351)
... 39 common frames omitted
Cause analysis:
After comparison and detection, it turns out that the referenced lib package is caused by redundancy
Solution:
Delete the package in lib folder, execute Maven install, and copy the jar package in Lib in target to Lib folder again
Error message:
org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'com.cy.mapper.UserMapperTests': Unsatisfied dependency expressed through field 'userMapper'; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.cy.mapper.UserMapper' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.resolveFieldValue(AutowiredAnnotationBeanPostProcessor.java:659) ~[spring-beans-5.3.19.jar:5.3.19]
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:639) ~[spring-beans-5.3.19.jar:5.3.19]
at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:119) ~[spring-beans-5.3.19.jar:5.3.19]
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:399) ~[spring-beans-5.3.19.jar:5.3.19]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1431) ~[spring-beans-5.3.19.jar:5.3.19]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.autowireBeanProperties(AbstractAutowireCapableBeanFactory.java:417) ~[spring-beans-5.3.19.jar:5.3.19]
at org.springframework.test.context.support.DependencyInjectionTestExecutionListener.injectDependencies(DependencyInjectionTestExecutionListener.java:119) ~[spring-test-5.3.19.jar:5.3.19]
at org.springframework.test.context.support.DependencyInjectionTestExecutionListener.prepareTestInstance(DependencyInjectionTestExecutionListener.java:83) ~[spring-test-5.3.19.jar:5.3.19]
at org.springframework.boot.test.autoconfigure.SpringBootDependencyInjectionTestExecutionListener.prepareTestInstance(SpringBootDependencyInjectionTestExecutionListener.java:43) ~[spring-boot-test-autoconfigure-2.6.7.jar:2.6.7]
at org.springframework.test.context.TestContextManager.prepareTestInstance(TestContextManager.java:248) ~[spring-test-5.3.19.jar:5.3.19]
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.createTest(SpringJUnit4ClassRunner.java:227) [spring-test-5.3.19.jar:5.3.19]
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner$1.runReflectiveCall(SpringJUnit4ClassRunner.java:289) [spring-test-5.3.19.jar:5.3.19]
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12) [junit-4.13.2.jar:4.13.2]
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.methodBlock(SpringJUnit4ClassRunner.java:291) [spring-test-5.3.19.jar:5.3.19]
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:246) [spring-test-5.3.19.jar:5.3.19]
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:97) [spring-test-5.3.19.jar:5.3.19]
at org.junit.runners.ParentRunner$4.run(ParentRunner.java:331) [junit-4.13.2.jar:4.13.2]
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:79) [junit-4.13.2.jar:4.13.2]
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:329) [junit-4.13.2.jar:4.13.2]
at org.junit.runners.ParentRunner.access$100(ParentRunner.java:66) [junit-4.13.2.jar:4.13.2]
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:293) [junit-4.13.2.jar:4.13.2]
at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61) [spring-test-5.3.19.jar:5.3.19]
at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70) [spring-test-5.3.19.jar:5.3.19]
at org.junit.runners.ParentRunner$3.evaluate(ParentRunner.java:306) [junit-4.13.2.jar:4.13.2]
at org.junit.runners.ParentRunner.run(ParentRunner.java:413) [junit-4.13.2.jar:4.13.2]
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:190) [spring-test-5.3.19.jar:5.3.19]
at org.junit.runner.JUnitCore.run(JUnitCore.java:137) [junit-4.13.2.jar:4.13.2]
at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:69) [junit-rt.jar:na]
at com.intellij.rt.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:33) [junit-rt.jar:na]
at com.intellij.rt.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:235) [junit-rt.jar:na]
at com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java:54) [junit-rt.jar:na]
Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.cy.mapper.UserMapper' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
at org.springframework.beans.factory.support.DefaultListableBeanFactory.raiseNoMatchingBeanFound(DefaultListableBeanFactory.java:1799) ~[spring-beans-5.3.19.jar:5.3.19]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1355) ~[spring-beans-5.3.19.jar:5.3.19]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1309) ~[spring-beans-5.3.19.jar:5.3.19]
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.resolveFieldValue(AutowiredAnnotationBeanPostProcessor.java:656) ~[spring-beans-5.3.19.jar:5.3.19]
... 30 common frames omittedNo qualifying bean of type 'com.cy.mapper.UserMapper' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
In the error message, you can know that there is an error when injecting the bean of usermapper
Error reason:
Mapper package scan path error on springboot boot start class
package com.cy;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
@MapperScan("mapper")
//mapperScan annotation to automatically load all mapper interface files when the project starts
public class StoreApplication {
public static void main(String[] args) {
SpringApplication.run(StoreApplication.class, args);
}
}Solution: Modify @MapperScan(“mapper”) to the correct path.
Problem description
The following error occurred while connecting Hikari. Initialization failed
ERROR 27468 — [nio-8080-exec-1] com.zaxxer.hikari.pool.HikariPool : HikariPool-1 – Exception during pool initialization.
Cause analysis:
It may be a driving problem
The MySQL version on this machine is higher than the driver version used. Unable to connect. You can check the version of MySQL and compare it with the driver used. Then look at dependency import.
Solution:
My solution is as follows: because my MySQL version is 8.0, then I use the connection package of 5. So the connection failed. So I first import the 8.0 connection package, and then modify the dependent version number. Note: if you use the 8.0 connection package, you need to change the class forname to: com.mysql.cj.jdbc.Driver. Then the problem was solved
Error: Blocked mirror for repositories maven intellij
Error
the following errors appear when building a project:
Solution:
First case
Change settings: preference -> Build, Execution, Deployment -> Build Tools -> Maven
Find Maven home path and change the default checked version to use Maven wrapper
build succeefully
The second case
Maven is not installed. It is recommended to reinstall Maven
brew install maven