This week's book giveaway is in the Cloud/Virtualization forum.
We're giving away four copies of Learning OpenStack Networking: Build a solid foundation in virtual networking technologies for OpenStack-based clouds and have James Denton on-line!
See this thread for details.
Win a copy of Learning OpenStack Networking: Build a solid foundation in virtual networking technologies for OpenStack-based clouds this week in the Cloud/Virtualization forum!

yu wang

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since Dec 12, 2006
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Recent posts by yu wang

It is a problem about your JDK version. Maybe the version of building the class and the version of running the class are not same.
11 years ago
java.lang.ClassCastException means that your class have some problem. The tomcat don't think it as a servlet. Maybe your class don't have the post method.
11 years ago
A jsp is just a servlet. But I think putting all codes into a servlet is a better chance.
11 years ago
JSP
You can use javascript to do this. After the user press the button first time , using javascipt to disable the button. When the user click the button second time, there will be nothing happen(No form will be sent to the server).
11 years ago