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2. Server caught unhandled exception from servlet

Dear, I have the following exception just occur occassionally. This error occurs when I press a link to popup a page , but when observing this error occurs, I press the link again, it will be back up normal without any error. Can anyone help me to solve this problem and give me some suggestion Message: Server caught unhandled exception from ...

3. Servlet Exception in Sun server

4. JSP server exception