Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.

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