Coldfusion Error Messages
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when it encounters errors. In addition, it provides a variety of tools and techniques for you to customize error information and handle errors when they occur. php error messages You can use any of the following error-management techniques. Specify custom pages dreamweaver error messages for ColdFusion to display in each of the following cases: When a ColdFusion page is missing (the Missing flash error messages Template Handler page) When an otherwise-unhandled exception error occurs during the processing of a page (the Site-wide Error Handler page) You specify these pages on the Settings page in css error messages the Server Settings page in the ColdFusion Administrator; for more information, see the ColdFusion Administrator Help. Use the cferror tag to specify ColdFusion pages to handle specific types of errors. Use the cftry, cfcatch, cfthrow, and cfrethrow tags to catch and handle exception errors directly on the page where they occur. In CFScript, use the try and catch statements
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to handle exceptions. Use the onError event in Application.cfc to handle exception errors that are not handled by try/catch code on the application pages. Log errors. ColdFusion logs certain errors by default. You can use the cflog tag to log other errors. The following information is detailed in the next few topics: The basic building blocks for understating types of ColdFusion errors and how ColdFusion handles them How to use the cferror tag to specify error-handling pages How to log errors How to handle ColdFusion exceptions Note: Information about using the cftry and cfcatch tags is provided, but not the equivalent CFScript try and catch statements. The general discussion of exception handling applies to tags and CFScript statements. However, the code that you use and the information available in CFScript differs from the information in the tags. For more information on handling exceptions in CFScript, see Handling errors in UDFs. Twitter™ and Facebook posts are not covered under the terms of Creative Commons. Home / DevelopingColdFusion 9 Applications / Developing CFML Applications / Handling Errors
You specify the custom error pages with the cferror tag. For Validation errors, the tag must be in the Application.cfc initialization
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code or on the Application.cfm page. For Exception and Request coldfusion error page errors, you can set the custom error pages on each application page. However, because custom error pages coldfusion error 500 generally apply to an entire application, it is more efficient to place these cferror tags in the Application.cfc or Application.cfm file also. For more information on using http://help.adobe.com/en_US/ColdFusion/9.0/Developing/WSc3ff6d0ea77859461172e0811cbec0bb9b-7ffe.html these pages, see Designing and Optimizing a ColdFusion Application The cferror tag has the attributes listed in the following table: Attribute Description Type The type of error that causes ColdFusion to display this page: Exception, Request, or Validation. Exception Use only for the Exception type. The specific exception or exception category that causes the page http://help.adobe.com/en_US/ColdFusion/9.0/Developing/WSc3ff6d0ea77859461172e0811cbec22c24-747c.html to display. This attribute can specify any of the types described in About ColdFusion exceptions. Template The ColdFusion page to display. MailTo (Optional) An e-mail address. The cferror tag sets the error page error.mailTo variable to this value. The error page can use the error.mailTo value in a message that tells the user to send an error notification. ColdFusion does not send any message itself. The following cferror tag specifies a custom error page for exceptions that occur in locking code and informs the error page of the e-mail address to use to send a notification each time this type of error occurs:
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world as long as the Muse you have heard of Mary Jo Sminkey. Mary Jo built a popular ColdFusion ecommerce platform called CFWebstore. She has vast experience in ColdFusion and a seemingly boundless fountain of energy. Her eclectic interests range from technology to baking to dog training. As far as CF Webtools and the Muse can tell, Mary Jo excels at everything she does. We frankly suspect she is actually twins or triplets pretending to be only one person :) The following article is by Mary Jo and details her approach to application specific error handling. She has a detailed and thorough knowledge of the topic. Using this approach she has been able to reduce the number of errors on a very high traffic E-commerce site to practically nil. In the first of 2 articles MJ (as we call her with great affection) details the structure and usage of the handler. Building a Robust Error Handler (by Mary Jo Sminkey) Let's face it, sometimes we put less effort into the error handler than into the rest of our code. We might put something in place that throws up a "user friendly" page, and maybe email a dump of the catch or error structure, but when the site goes live, and we are deluged with errors due to search bots, hack attempts and poorly coded pages we turn it off or send all those emails to a seldom-visited mailbox. Sometimes we implement error handling as cftry/cfcatch blocks that do little more than preventing errors from being thrown, instead of helping us track down the issue. I look at the error handler as a way to help make a site as bug-free as possible. By having it email me as much information as possible about errors, I troubleshoot, fix and patch, and get to a point where errors are the exception rather than the rule. In this article, we'll look at building a single-page, comprehensive error handler. In a future article, we'll look at integrating that error handler with the open source bug tracker BugLogHQ. Before we begin with our error handler let's talk about our error handling strategy. Error Handling Strategy Obviously global error handling is a last ditch attempt to catch errors, and only part of a complete strategy for trapping errors. This article assumes you are using things like cftry/cfcatch in your code to handle expected issues that can arise (not just to hide errors). For example, on o