事实证明，在所提供的代码部分中所引用的keepedState为null的原因是因为正在创建一个新的Oauth2ClientContext实例，而这恰恰是不应该发生的事-
OAuth2ClientContext的整个目的就是存储状态。就OAuth2协议（RFC
6749）而言，保持状态对于跨站点请求伪造的预防非常重要（请参阅第10.12节）。
进行调试非常简单，只需启用调试日志记录，并将WSO2
IS生成的输出与一个工作示例中看到的进行比较。就我而言，我经常回到的工作示例是Spring团队自己提供的示例。
这是客户端配置（application.yml），然后使用Spring小组SSO服务器进行日志输出测试：
spring: profiles: defaultsecurity: oauth2: client: accessTokenUri: http://192.168.0.113:32768/uaa/oauth/token userAuthorizationUri: http://192.168.0.113:32768/uaa/oauth/authorize clientId: acme clientSecret: acmesecretresource: jwt: keyValue: | -----BEGIN PUBLIC KEY----- MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAnGp/Q5lh0P8nPL21oMMrt2RrkT9AW5jgYwLfSUnJVc9G6uR3cXRRDCjHqWU5WYwivcF180A6CWp/ireQFFBNowgc5XaA0kPpzEtgsA5YsNX7iSnUibB004iBTfU9hZ2Rbsc8cWqynT0RyN4TP1RYVSeVKvMQk4GT1r7JCEC+TNu1ELmbNwMQyzKjsfBXyIOCFU/E94ktvsTZUHF4Oq44DBylCDsS1k7/sfZC2G5EU7Oz0mhG8+Uz6MSEQHtoIi6mc8u64Rwi3Z3tscuWG2ShtsUFuNSAFNkY7LkLn+/hxLCu2bNISMaESa8dG22CIMuIeRLVcAmEWEWH5EEforTg+QIDAQAB -----END PUBLIC KEY----- id: openid serviceId: ${PREFIX:}resource请注意，没有提到创建 OAuth2ClientContext的行 。
DEBUG o.s.security.web.FilterChainProxy - /login?pre=9HLSpP&state=G9kpy3 at position 6 of 12 in additional filter chain; firing Filter: 'OAuth2ClientAuthenticationProcessingFilter'DEBUG o.s.s.w.u.m.AntPathRequestMatcher - Checking match of request : '/login'; against '/login'DEBUG o.s.s.o.c.f.OAuth2ClientAuthenticationProcessingFilter - Request is to process authenticationINFO o.s.s.o.c.DefaultOAuth2ClientContext - Getting access token requestDEBUG o.s.b.f.s.DefaultListableBeanFactory - Creating instance of bean 'scopedTarget.accessTokenRequest'DEBUG o.s.b.f.s.DefaultListableBeanFactory - Returning cached instance of singleton bean 'org.springframework.security.oauth2.config.annotation.web.configuration.OAuth2ClientConfiguration'DEBUG o.s.b.f.s.DefaultListableBeanFactory - Finished creating instance of bean 'scopedTarget.accessTokenRequest'INFO o.s.s.o.client.OAuth2RestTemplate - Longer lived state key: G9kpy3INFO o.s.s.o.client.OAuth2RestTemplate - Removing preserved state in oauth2contextINFO o.s.s.o.c.DefaultOAuth2ClientContext - Found preserved state: http://localhost:9999/login
这是客户端配置（application.yml），然后使用WSO2IS 5.0.0进行日志输出测试：
spring: profiles: wso2server: port: 9998security: oauth2: client: accessTokenUri: https://localhost:9443/oauth2/token userAuthorizationUri: https://localhost:9443/oauth2/authorize clientId: yKSD9XwET9XJ3srGEFXP6AfHhAka clientSecret: zuPTcdJH435h3wgl055XNZ5ffNMa scope: openid clientAuthenticationScheme: header resource: userInfoUri: https://localhost:9443/oauth2/userinfo?schema=openid
在 创建bean’scopedTarget.oauth2ClientContext’实例 的行中记下这一行。
DEBUG o.s.security.web.FilterChainProxy - /login?state=PWhQwv&pre=372ff0c197a4c85a0caf070cc9a6678 at position 6 of 12 in additional filter chain; firing Filter: 'OAuth2ClientAuthenticationProcessingFilter'DEBUG o.s.s.w.u.m.AntPathRequestMatcher - Checking match of request : '/login'; against '/login'DEBUG o.s.s.o.c.f.OAuth2ClientAuthenticationProcessingFilter - Request is to process authenticationDEBUG o.s.b.f.s.DefaultListableBeanFactory - Creating instance of bean 'scopedTarget.oauth2ClientContext'DEBUG o.s.b.f.s.DefaultListableBeanFactory - Returning cached instance of singleton bean 'org.springframework.boot.autoconfigure.security.oauth2.client.OAuth2RestOperationsConfiguration$SessionScopedConfiguration$ClientContextConfiguration'DEBUG o.s.b.f.s.DefaultListableBeanFactory - Finished creating instance of bean 'scopedTarget.oauth2ClientContext'INFO o.s.s.o.c.DefaultOAuth2ClientContext - Getting access token requestDEBUG o.s.b.f.s.DefaultListableBeanFactory - Creating instance of bean 'scopedTarget.accessTokenRequest'DEBUG o.s.b.f.s.DefaultListableBeanFactory - Returning cached instance of singleton bean 'org.springframework.security.oauth2.config.annotation.web.configuration.OAuth2ClientConfiguration'DEBUG o.s.b.f.s.DefaultListableBeanFactory - Finished creating instance of bean 'scopedTarget.accessTokenRequest'INFO o.s.s.o.client.OAuth2RestTemplate - Longer lived state key: PWhQwvINFO o.s.s.o.client.OAuth2RestTemplate - Removing preserved state in oauth2contextINFO o.s.s.o.c.DefaultOAuth2ClientContext - Found preserved state: null
最后，调用的下一个端口自然是要确定为什么未使用WSO2 IS配置创建OAuth2ClientContext。调查表明，这是因为WSO2
IS没有传回预期的JSESSIONID，因此找不到以会话为范围的OAuth2ClientContext。
如果迫切需要解决此问题的潜在方法是克隆Spring OAuth 2并执行以下操作：
在AuthorizationCodeAccessTokenProvider类中，对hack进行以下操作以更改请求中的保留状态。
private MultiValueMap<String, String> getParametersForTokenRequest(AuthorizationCodeResourceDetails resource, AccessTokenRequest request) { MultiValueMap<String, String> form = new linkedMultiValueMap<String, String>(); form.set("grant_type", "authorization_pre"); form.set("pre", request.getAuthorizationCode()); request.setPreservedState("http://localhost:9998/login"); Object preservedState = request.getPreservedState();
