记录 Spring Boot2 启动报错The bean ‘beanNameViewResolver‘, defined in class path...
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记录 Spring Boot2 启动报错The bean ‘beanNameViewResolver‘, defined in class path resource 解决过程
在必问里面回答一个网友的问题:https://biwen.csdn.net/question/4664
一、问题现象
Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2020-07-19 10:47:22.557 ERROR 7412 --- [ main] o.s.b.d.LoggingFailureAnalysisReporter :
***************************
APPLICATION FAILED TO START
***************************
Description:
The bean 'beanNameViewResolver', defined in class path resource [cn/afterturn/easypoi/configuration/EasyPoiAutoConfiguration.class], could not be registered. A bean with that name has already been defined in class path resource [org/springframework/boot/autoconfigure/web/servlet/error/ErrorMvcAutoConfiguration$WhitelabelErrorViewConfiguration.class] and overriding is disabled.
Action:
Consider renaming one of the beans or enabling overriding by setting spring.main.allow-bean-definition-overriding=true
上面错误已经提示我们在application.ym/application.properties添加如下配置就可以解决。
spring.main.allow-bean-definition-overriding=true
spring.main.allow-bean-definition-overriding设置为true,表示后发现的bean会覆盖之前相同名称的bean。
但是添加这个配置无效,启动仍然提示上面错误。
二、问题分析和原因
1、怀疑spring没有读取到spring.main.allow-bean-definition-overriding
把这个参数spring.main.allow-bean-definition-overriding放到启动参数里面,然后启动看看:
然后启动spring boot报错信息,数据源配置错误:Failed to configure a DataSource: 'url' attribute is not specified and no embedded datasource could be configured.
这已经说明spring已经正确读取到spring.main.allow-bean-definition-overriding。初步怀疑spring没有读取带application.yml 配置。
2、debug数据源配置信息
1)、在启动参数添加spring.datasource.url
2)、同时断点debug数据源配置,
可以看到数据源配置信息,在启动参数里面spring.datasource.url可以读到,但spring.datasource.username和spring.datasource.password没有读取到。
明确问题原因:spring无法读取application.yml配置。
由于没有注意springboot启动的提示信息:No active profile set, 但在application.yml已经指明sprin.profiles.active=test. 这就已经说明了spring没有正确读取到application.yml配置。
3、分析无法读取application.yml文件的原因
1)springboot编译后默认把application.yml文件是放在target/classes目录下。
查看编译后的目录结构, 结果application.yml是在BOOT-INF/classes目录下,导致在idea启动时候,spring无法正常读取到application.yml.
2)、最后检查maven编译设置,原来是在pom.xm指定了编译路径。
三、问题解决
注释掉这些信息就可以在IDEA下正常启动:
spring boot使用spring-boot maven插件打包,会把resource的文件放到BOOT-INF\classes下。所以不必设置编译resources项。
解压打包后 的jar包就可以看到resources的源文件都在BOOT-INF\classes目录下。
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