JPA 中 failed to lazily initialize a collection of role: com.test.security.rbac.domain.Resource.urls, could not initialize proxy - no Session

failed to lazily initialize a collection of role: com.test.security.rbac.domain.Resource.urls, could not initialize proxy - no Session

原：

......
/**
 * 实际需要控制权限的url
*/
@ElementCollection
private Set<String> urls;
......

新：

......
    /**
     * 实际需要控制权限的url
     */
    @ElementCollection(fetch =FetchType.EAGER)
    private Set<String> urls;
.....

网上说的原因是惰加引用的错误