问题原因：通过springboot的启动类来启动springboot项目时，报错。但是通过maven packeage打包后，再启动没有问题。
org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'applicationRunnerImpl': Unsatisfied dependency expressed through field 'appXSession'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'appXSession' defined in class path resource [com/bk/config/AppXSessionConfig.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.bk.clientx.AppXSession]: Factory method 'appXSession' threw exception; nested exception is java.lang.NullPointerException 这个报错什么 意思？
解决办法：清理idea缓存
标签：ApplicationContext,exception,run,factory,springframework,nested,application,Erro From： https://www.cnblogs.com/wwssgg/p/18441218