以下内容皆针对grails1.0.3，其他版本是否有问题待验证。
1) bug:
url解析问题:
/show/xxx.yyy 这样的url解析之后，params.id 值为 xxx而不是 xxx.yyy。
暂时以 /show?id=xxx.yy 这样的方式来解决。
应该是 org.codehaus.groovy.grails.web.mapping.filter.UrlMappingsFilter中的bug，不知道新版本fix了没有
2) beforeUpdate 的问题
访问类中属性必须加上 this关键字，这个真的感觉有些莫名其妙，先记下来以后解决吧。
class User {
int id
String name
def beforeUpdate = {
println ("beforeUpdate, id=" + id + ",this.id=" + this.id);
}
}
打印的结果是：
beforeUpdate, id=null,this.id=1
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