springboot Unable to start embedded container; nested exception is java.lang.NullPointerException

springboot通过使用druid-spring-boot-starter整合Druid后一直报错,问题是之前使用druid依赖整合是没问题的!

先报:

org.springframework.context.ApplicationContextException: Unable to start embedded container; nested exception is java.lang.NullPointerException

怀疑是版本冲突,把spring-boot版本换成了2.1.10,结果报错:

Caused by: java.lang.ClassNotFoundException: org.springframework.boot.bind.RelaxedPropertyResolver

网上看了下说是少了

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.1.10.RELEASE</version>
    <relativePath/>
</parent>

到项目一看,果然没有这个!当时创建springboot项目时,网络太卡,等了很久,就创建了个普通的java项目改造,留下这个大坑!