java.lang.IllegalArgumentException: An invalid domain [.test.com] was specified for this cookie

当项目中使用单点登陆功能时，一般会使用cookie进行信息的保存，这样就能够在多个子域名上存取用户信息。
好比有三个domain分别为test.com,cml.test.com,b.test.com这三个域名下的cookie是须要互相访问的。这时会在response上写入cookie信息

Cookie cookie = new Cookie("testCookie", "test");
        cookie.setDomain(".test.com");
        cookie.setPath("/");
        cookie.setMaxAge(36000);
        resp.addCookie(cookie);

这样写在tomcat8.0上是没问题的，三个域名能够共享cookie信息。可是把它放到tomcat8.5上就报错了

java.lang.IllegalArgumentException: An invalid domain [.test.com] was specified for this cookie
        at org.apache.tomcat.util.http.Rfc6265CookieProcessor.validateDomain(Rfc6265CookieProcessor.java:181)
        at org.apache.tomcat.util.http.Rfc6265CookieProcessor.generateHeader(Rfc6265CookieProcessor.java:123)
        at org.apache.catalina.connector.Response.generateCookieString(Response.java:989)
        at org.apache.catalina.connector.Response.addCookie(Response.java:937)
        at org.apache.catalina.connector.ResponseFacade.addCookie(ResponseFacade.java:386)
        at com.cml.mvc.controller.HelloWorld.str(HelloWorld.java:98)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:497)
        at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:221)
        at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:137)
        at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:110)
        at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:777)
        at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:706)
        at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85)

在tomcat8.5上是使用org.apache.tomcat.util.http.Rfc6265CookieProcessor

The standard implementation of CookieProcessor is org.apache.tomcat.util.http.Rfc6265CookieProcessor.

This cookie processor is based on RFC6265 with the following changes to support better interoperability:

Values 0x80 to 0xFF are permitted in cookie-octet to support the use of UTF-8 in cookie values as used by HTML 5.
For cookies without a value, the '=' is not required after the name as some browsers do not sent it.
The RFC 6265 cookie processor is generally more lenient than the legacy cookie parser. In particular:

The '=' and '/' characters are always permitted in a cookie value.
Name only cookies are always permitted.
The cookie header is always preserved.
No additional attributes are supported by the RFC 6265 Cookie Processor.

文档地址

在tomcat8.0上使用的是org.apache.tomcat.util.http.LegacyCookieProcessor

The standard implementation of CookieProcessor is org.apache.tomcat.util.http.LegacyCookieProcessor. Note that it is anticipated that this will change to org.apache.tomcat.util.http.Rfc6265CookieProcessor in a future Tomcat 8 release.

This is the legacy cookie parser based on RFC6265, RFC2109 and RFC2616. It implements a strict interpretation of the cookie specifications. Due to various interoperability issues with browsers not all strict behaviours are enabled by default and additional options are available to further relax the behaviour of this cookie processor if required.

文档地址

问题就能够定位在CookieProcessor不一样实现引发的。
缘由分析见下半篇博客：An invalid domain [.test.com] was specified for this cookie 缘由分析

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解决方法：

1. 指定完整的domain信息，可是这样单点登陆就会有问题了

Cookie cookie = new Cookie("testCookie", "test");
        cookie.setDomain("cml.test.com");
        cookie.setPath("/");
        cookie.setMaxAge(36000);
        resp.addCookie(cookie);

2.设置为一级域名（推荐）

Cookie cookie = new Cookie("testCookie", "test");
        cookie.setDomain("test.com");
        cookie.setPath("/");
        cookie.setMaxAge(36000);
        resp.addCookie(cookie);

域名问题参考文章：顶级域名和二级域名共享cookie及相互删除cookie