最新的DWR2.0M2版本。2.0加了很多东西，也有不少变化的地方。最容易看到的变化就是包名的变化了,由 uk.ltd.getahead 变成了 org.directwebremoting 。
换上了新的配置
1<servlet>
2 <servlet-name>dwr-invoker</servlet-name>
3 <servlet-class>org.directwebremoting.servlet.DwrServlet</servlet-class>
4 <init-param>
5 <param-name>debug</param-name>
6 <param-value>true</param-value>
7 </init-param>
8 <load-on-startup>1</load-on-startup>
9</servlet>
2 <servlet-name>dwr-invoker</servlet-name>
3 <servlet-class>org.directwebremoting.servlet.DwrServlet</servlet-class>
4 <init-param>
5 <param-name>debug</param-name>
6 <param-value>true</param-value>
7 </init-param>
8 <load-on-startup>1</load-on-startup>
9</servlet>
启动服务，抱错了。
1java.lang.IllegalArgumentException: DefaultContainer can't find a classes
2 at org.directwebremoting.impl.DefaultContainer.getBean(DefaultContainer.java:216)
3 at org.directwebremoting.annotations.AnnotationsConfigurator.configure(AnnotationsConfigurator.java:50)
4 at org.directwebremoting.servlet.DwrServlet.init(DwrServlet.java:121)
2 at org.directwebremoting.impl.DefaultContainer.getBean(DefaultContainer.java:216)
3 at org.directwebremoting.annotations.AnnotationsConfigurator.configure(AnnotationsConfigurator.java:50)
4 at org.directwebremoting.servlet.DwrServlet.init(DwrServlet.java:121)
在DWR的Maillist里面搜索了一下，还有答案，原来DWR2.0 加入了JDK5的注释(annotations).DwrServlet初始化的时候会去检查注释的类，找不到就抱错了。如果你不用annotations也可以忽略掉这个错误。不过看起来总是不爽。有人提出了方案。这样就ok了。
1<servlet>
2 <servlet-name>dwr-invoker</servlet-name>
3 <servlet-class>org.directwebremoting.servlet.DwrServlet</servlet-class>
4 <init-param>
5 <param-name>debug</param-name>
6 <param-value>true</param-value>
7 </init-param>
8 <init-param>
9 <param-name>classes</param-name>
10 <param-value>java.lang.Object</param-value>
11 </init-param>
12 <load-on-startup>100</load-on-startup>
13</servlet>
2 <servlet-name>dwr-invoker</servlet-name>
3 <servlet-class>org.directwebremoting.servlet.DwrServlet</servlet-class>
4 <init-param>
5 <param-name>debug</param-name>
6 <param-value>true</param-value>
7 </init-param>
8 <init-param>
9 <param-name>classes</param-name>
10 <param-value>java.lang.Object</param-value>
11 </init-param>
12 <load-on-startup>100</load-on-startup>
13</servlet>