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Update your applications configuration更新应用程序的配置

　
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程序运行时出现了以下报错

Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2020-06-08 14:34:40.870 ERROR 17532 --- [  restartedMain] o.s.b.d.LoggingFailureAnalysisReporter   : 

***************************
APPLICATION FAILED TO START
***************************

Description:

Binding to target [Bindable@36dd790e type = org.springframework.boot.autoconfigure.web.ResourceProperties, value = 'provided', annotations = array<Annotation>[@org.springframework.boot.context.properties.ConfigurationProperties(prefix=spring.resources, value=spring.resources, ignoreInvalidFields=false, ignoreUnknownFields=false)]] failed:

    Property: spring.resources.cache-period
    Value: 0
    Origin: "spring.resources.cache-period" from property source "refresh"
    Reason: The elements [spring.resources.cache-period] were left unbound.

Action:

Update your application's configuration
主要看 Reason: The elements [spring.resources.cache-period] were left unbound. 是说开启热部署失败。

解决了。
导入了jackson依赖，还根据另一个经验贴的建议，修改了devtools依赖

        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-core</artifactId>
            <version> 2.11.0</version>
            <type> bundle</type>
        </dependency>     

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <version> 2.1.4.RELEASE</version>
        </dependency>

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