美好的一天！你能为我解释吗？我有两个服务器-webseal和websphere 9.0。在Websphere上，我导出了ltpa密钥并启用了安全应用程序检查。在webseal上，我导入了ltpa密钥。我的代码：

        try {
            Subject cs = WSSubject.getcallerSubject();
            logger.info("subject: ",cs);
            logger.info("subjectPrincipal: ",WSSubject.getcallerPrincipal());
            Subject rs = WSSubject.getRunAsSubject();
            logger.info("runSubject: ",rs);
            Set securityCredentials = rs.getPublicCredentials(WSCredential.class);
            WSCredential sc = (WSCredential) securityCredentials.iterator().next();
            logger.info("securityCredential.getSecurityName(): ",sc.getSecurityName());
            return cs != null;
        } catch (Exception e) {
            logger.error("Exception: ",e);
            throw new SecurityException("Can't authorize subject");
        }

在我的日志中：

SecurityService     : subject: 
SecurityService     : subjectPrincipal: 
SecurityService     : runSubject: 
SecurityService     : securityCredential.getSecurityName(): 

发生了什么事？为什么我的callerSubject！= null，但是在我的日志中没有关于安全详细信息的更多信息？ ltpa令牌是否正确检查？