Adobe COLDFUSION 9 Manual page 282

Developing applications

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DEVELOPING COLDFUSION 9 APPLICATIONS

Developing CFML Applications

Missing template

Form field data validation

Note: The onSubmit and onBlur form field validation techniques use JavaScript or Flash validation on the client browser.

About ColdFusion exceptions

Most ColdFusion errors are exceptions. You can categorize ColdFusion exceptions in two ways:

• When they occur

• Their type

When exceptions occur

ColdFusion errors can occur at two times, when the CFML is compiled into Java and when the resulting Java executes,

called runtime exceptions.

Compiler exceptions

Compiler exceptions are programming errors that ColdFusion identifies when it compiles CFML into Java. Because

compiler exceptions occur before the ColdFusion page is converted to executable code, you cannot handle them on

the page that causes them. However, other pages can handle these errors. For more information, see

exceptions" on page 282.

Runtime exception

A runtime exception occurs when the compiled ColdFusion Java code runs. It is an event that disrupts the normal flow

of instructions in the application. Exceptions can result from system errors or program logic errors. Runtime

exceptions include:

• Error responses from external services, such as an ODBC driver or CORBA server

• CFML errors or the results of

• Internal errors in ColdFusion

An error that prevents normal processing from continuing. All ColdFusion exceptions are, at their

root, Java exceptions.

An HTTP request for a ColdFusion page that cannot be found. Generated if a browser requests a

ColdFusion page that does not exist.

Missing template errors are different from missing include exceptions, which result from

tags or custom tag calls that cannot find their targets.

Server-side form field validation errors are a special kind of ColdFusion exception. You specify server-

side form validation by using

side validation, such as the cfparam tag generate runtime exceptions. For more information on

validating form fields see

ColdFusion includes a built-in error page for server-side form field validation errors, and the cferror

tag includes a

attribute that lets you handle these errors in a custom error page, but if you use

onError processing in Application.cfc, or try/catch error handling, the error appears as an Application

exception. For more information on handling Form field validation in Application.cfc see

server-side validation errors in the onError