SpringBoot项目启动失败的常见错误总结

没有启动的三角按钮
项目结构缺少 Maven Dependencies

Could not resolve dependencies
pom.xml 文件出现红色下划线

Caused by: org.yaml.snakeyaml.error.YAMLException: java.nio.charset.MalformedInputException: Input length = 2

Failed to load application context
Caused by: org.springframework.beans.factory.BeanDefinitionStoreException: Invalid bean definition with name 'org.springframework.boot.autoconfigure.internalCachingMetadataReaderFactory' defined in null: Could not resolve placeholder 'spring.application.name' in value "${spring.application.name}"

Error: A JNI error has occurred, please check your installation and try again
Invalid maximum heap size: -Xmx512m
The specified size exceeds the maximum representable size.

*************************** APPLICATION FAILED TO START ***************************
Description: The Tomcat connector configured to listen on port 8080 failed to start. The port may already be in use or the connector may be misconfigured.
Action: Verify the connector's configuration, identify and stop any process that's listening on port 8080, or configure this application to listen on another port.

Exception in thread "main" java.lang.NoSuchMethodError: org.springframework.core.annotation.AnnotationUtils.isCandidateClass(Ljava/lang/Class;Ljava/lang/Class;)Z

org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.example.demo.service.UserService' available: expected at least 1 bean which qualifies as autowire candidate.

Field clustersDetailsAmqMapper in com.ruoyi.clusters.service.impl.ClustersDetailsAmqServiceImpl required a bean of type 'com.ruoyi.clusters.mapper.ClustersDetailsAmqMapper' that could not be found.

org.springframework.boot.autoconfigure.jdbc.DataSourceProperties$DataSourceBeanCreationException: Failed to configure a DataSource: 'url' attribute is not specified and no embedded datasource could be configured.

Unable to connect to database

找不到主类

java.lang.IllegalArgumentException: Invalid character found in the request target. The valid characters are defined in RFC 7230 and RFC 3986

The following dependencies have a problem:
- spring-boot-starter-web: 2.4.3
- spring-cloud-starter-eureka: 2.2.12