springcloud 项目搭建遇到的各种问题总结

古城微笑少年丶 2022-02-09 13:21 262阅读 0赞

> 第一次访问无法负载均衡

ribbon.eureka.enable = true

> 数据源自动配置错误

Failed to auto-configure a DataSource: 'spring.datasource.url' is not specified and no embedded data

解决方法：   @SpringBootApplication(exclude = \{DataSourceAutoConfiguration.class\})

> java.lang.IllegalArgumentException: Property 'sqlSessionFactory' or 'sqlSessionTemplate' are require

手动配置 MybatisConfig

>     public class MybatisConfig {
>         @Autowired
>         private DataSourceProperties dataSourceProperties;
>     
>     
>         @Bean(name = "dataSource")
>         public DataSource dataSource() {
>     
>             DruidDataSource dataSource = new DruidDataSource();
>             dataSource.setUrl(dataSourceProperties.getUrl());
>             System.out.println(dataSourceProperties.getUrl());
>             dataSource.setDriverClassName(dataSourceProperties.getDriverClassName());
>             dataSource.setUsername(dataSourceProperties.getUsername());
>             dataSource.setPassword(dataSourceProperties.getPassword());
>     
>             return dataSource;
>     
>         }
>     
>         public SqlSessionFactory sqlSessionFactory() throws Exception {
>             SqlSessionFactoryBean sqlSessionFactoryBean = new SqlSessionFactoryBean();
>             sqlSessionFactoryBean.setDataSource(dataSource());
>             return sqlSessionFactoryBean.getObject();
>         }
>     }
> 
>   
> ` `

>  spring调用fegin 常见问题

问题1  Load balancer does not have available server for client：

原因： 服务名称和feginClient()接口上的名称不一致导致

问题2：不执行fegin 接口实现类

原因：通过注解 @Component 注册到spring容器中

> springcloud+gateWay遇到的问题

必须是springboot 2.14以上版本

***************************
    APPLICATION FAILED TO START
    ***************************
     
    Description:
     
    Parameter 0 of method modifyRequestBodyGatewayFilterFactory in 
    org.springframework.cloud.gateway.config.GatewayAutoConfiguration required a bean of 
    type 'org.springframework.http.codec.ServerCodecConfigurer' that could not be found.
     
     
    Action:
     
    Consider defining a bean of type 'org.springframework.http.codec.ServerCodecConfigurer' in your configuration.

将pom.xml中关于spring-boot-start-web模块的jar依赖去掉。

错误分析：

根据上面描述（Description）中信息了解到GatewayAutoConfiguration这个配置中找不到ServerCodecConfig这个Bean。

spring cloud gateway server项目是一个spring boot项目，在启动的时候会去加载它的配置，其中有一个叫做GatewayClassPathWarningAutoConfiguration的配置类中有这么一行代码：

@Configuration
    @ConditionalOnClass(name = "org.springframework.web.servlet.DispatcherServlet")
    protected static class SpringMvcFoundOnClasspathConfiguration {
     
        public SpringMvcFoundOnClasspathConfiguration() {
            log.warn(BORDER+"Spring MVC found on classpath, which is incompatible with Spring Cloud Gateway at this time. "+
            "Please remove spring-boot-starter-web dependency."+BORDER);
        }
     
    }

log.warn中翻译一下意思就是“在类路径上找到的Spring MVC，此时它与Spring Cloud网关不兼容。请删除spring-boot-start-web依赖项。”。

因为spring cloud gateway是基于webflux的，如果非要web支持的话需要导入spring-boot-starter-webflux而不是spring-boot-start-web。