cas认证后跳转，出错，求助了

qad 2012-06-01 01:48:55

版本：
server-3.4.12
client-3.2.1

服务端已配好，访问也正常

web.xml:

		<filter>  

				<filter-name>CAS Single Sign Out Filter</filter-name>  

				<filter-class>org.jasig.cas.client.session.SingleSignOutFilter</filter-class>  

		</filter>

 

		<filter>  

				<filter-name>CASFilter</filter-name>  

				<filter-class>org.jasig.cas.client.authentication.AuthenticationFilter</filter-class>  

				<init-param>  

						<param-name>casServerLoginUrl</param-name>  

						<param-value>https://localhost:8443/cas/login</param-value>  

				</init-param>  

				<init-param>  

					<param-name>serverName</param-name>  

					<param-value>http://localhost:8080</param-value>  

				</init-param>  

		</filter>



		<filter>  

				<filter-name>CAS Validation Filter</filter-name>  

				<filter-class>org.jasig.cas.client.validation.Cas20ProxyReceivingTicketValidationFilter</filter-class>  

        <init-param>  

            <param-name>casServerUrlPrefix</param-name>  

            <param-value>https://localhost:8443/cas</param-value>  

        </init-param>  

        <init-param>  

            <param-name>serverName</param-name>  

            <param-value>http://localhost:8080</param-value>  

        </init-param>  

    </filter>  



    <filter>  

    		<filter-name>CAS HttpServletRequest Wrapper Filter</filter-name>  

    		<filter-class>org.jasig.cas.client.util.HttpServletRequestWrapperFilter</filter-class>  

    </filter>



    <filter>  

    		<filter-name>CAS Assertion Thread Local Filter</filter-name>  

    		<filter-class>org.jasig.cas.client.util.AssertionThreadLocalFilter</filter-class>  

    </filter>

server和client都在我本地电脑上

证书cn=localhost
也导入到jdk里了

现在通过client端认证，能跳转到server认证页面，输入用户名密码后，跳转回来，页面报错了：

java.lang.RuntimeException: javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target

	org.jasig.cas.client.util.CommonUtils.getResponseFromServer(CommonUtils.java:341)

	org.jasig.cas.client.util.CommonUtils.getResponseFromServer(CommonUtils.java:305)

	org.jasig.cas.client.validation.AbstractCasProtocolUrlBasedTicketValidator.retrieveResponseFromServer(AbstractCasProtocolUrlBasedTicketValidator.java:50)

	org.jasig.cas.client.validation.AbstractUrlBasedTicketValidator.validate(AbstractUrlBasedTicketValidator.java:207)

	org.jasig.cas.client.validation.AbstractTicketValidationFilter.doFilter(AbstractTicketValidationFilter.java:169)

	org.jasig.cas.client.authentication.AuthenticationFilter.doFilter(AuthenticationFilter.java:116)

	org.jasig.cas.client.session.SingleSignOutFilter.doFilter(SingleSignOutFilter.java:76)

请问怎么回事

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