请问报错UnavailableSecurityManagerException是什么回事

在springboot环境下测试的,会报错:

org.apache.shiro.UnavailableSecurityManagerException: No SecurityManager accessible to the calling code, either bound to the org.apache.shiro.util.ThreadContext or as a vm static singleton.  This is an invalid application configuration.

at org.apache.shiro.SecurityUtils.getSecurityManager(SecurityUtils.java:123)

at org.apache.shiro.subject.Subject$Builder.<init>(Subject.java:626)

at org.apache.shiro.SecurityUtils.getSubject(SecurityUtils.java:56)