sso模拟登陆在tomcat上正常,在websphere上却不正常

我采用的是httpclient的方式模拟登陆,然后再获取sessionid,再redirect到相应的页面,代码:
HttpClient client = new HttpClient();
		
PostMethod method = new PostMethod("url");
		
method.getParams().setCookiePolicy(CookiePolicy.IGNORE_COOKIES);
		
method.setRequestHeader("Cookie", "JSESSIONID=" + sSesId);
method.setRequestBody(param);
try{
      int statusCode = client.executeMethod(method);

   } catch (Exception e) {
	e.printStackTrace();
   } finally {
	method.releaseConnection();
   }


在tomcat下正常没有问题,但是在websphere下我跟踪到
sessionid是和登陆时一个sessionid,但是当session.getAttribute()时却为null,不知为什么??

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