Testcomplete 9.2 JScript Exception handling question.

Question

I have the following code.&nbsp;&nbsp;&nbsp; try&nbsp;&nbsp;&nbsp; {&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; throw new Error("error...");&nbsp;&nbsp;&nbsp; }&nbsp;&nbsp;&nbsp; catch (e)&nbsp;&nbsp;&nbsp; {&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Log.Message( "Exception caught");&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }This works as expected. and the script completes succesfully.but if the exception is thrown in a function higher in the stack.&nbsp;&nbsp;&nbsp; try&nbsp;&nbsp;&nbsp; {&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; funcA(); // funcA calls funcB() who calls funcC() who throws the exception.&nbsp;&nbsp;&nbsp; }&nbsp;&nbsp;&nbsp; catch (e)&nbsp;&nbsp;&nbsp; {&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Log.Message( "Exception caught");&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }The script stops and inform the user than an exception was thrown "Microsoft JScript runtime error..."when I dismiss the dialog the script ends and the code in the catch is never executed.if however in funcD I catch and rethrow the exception.&nbsp;&nbsp;&nbsp; try&nbsp;&nbsp;&nbsp; {&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; throw new Error(errorMessage);&nbsp;&nbsp;&nbsp; }&nbsp;&nbsp;&nbsp; catch (e)&nbsp;&nbsp;&nbsp; {&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Log.Message( "Exception caught, Rethrowing: " + errorMessage );&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; throw e;&nbsp;&nbsp;&nbsp; }I still get the dialog that halt the script but when I dismiss the dialog the execution resumes on the catch block that calls funcA. (first code posted). as one would expect. Any ideas?Ideally I would like the stack to unwind and not get an Exception Dialog at all. even if I have to catch and rethrow, but even that code seems like a hack.Thanks in advance.

philip_baird · Answer

Hi Will, here is an example of how I work-around this issue, instead of code throwing exceptions, I utilise JScripts loose typing by returning Exceptions instead

/**

* Demonstrates the Exception handling pattern to work around the Script Unit

* isoloation issue where the method that raises the exception would normally

* return a value

* @method demoPatternNormallyReturnValue

* @author Phillip Baird

* @date 01/07/2013

*/

function demoPatternNormallyReturnValue() {

var result; // Result of the method call

try {

// Call method that will return Exception

result = exceptionRaiser.raiseExcepionWithReturn( true );

// Check to see if a result was returned. The check is done for the generic

// BaseException as a catch all, with more specific type checking done in the

// catch block

if( result && ( result instanceof exceptions.BaseException ) ) {

throw result;

}

Log.Message( "No Exception " + result ); // No exception raised

} catch( exObj ) {

// Check for and handle specific exception types

if( exObj instanceof exceptions.CreateFolderException ) {

Log.Message( exObj.exceptionString() );

} else {

// Handle unknown exception type

Log.Message( "Unknown Exception" );

}

I have an Exception base prototype which allows me to check for instances of specific Exceptions.

It's a little un-wieldly but seems to work ok for my purposes

karkadil · Answer

It happens when function are located in different units. In this case exceptions can not be handled.This is a known limitation.

william_diaz · Answer

Thanks for the reply,Is there a workaround? how are others handling this?

sorin_velican · Answer

&nbsp;try &nbsp; &nbsp; { &nbsp; &nbsp; &nbsp; funcA(); // funcA calls funcB() who calls funcC() who throws the exception. &nbsp; &nbsp; } &nbsp; &nbsp; catch (e) &nbsp; &nbsp; { &nbsp; &nbsp; &nbsp; Log.Message( "Exception caught"); &nbsp;&nbsp; &nbsp; &nbsp; } &nbsp; should be something like&nbsp; &nbsp; &nbsp;try &nbsp; &nbsp; { &nbsp; &nbsp; &nbsp;if ( funcA() == "exception") &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;throw new Error(errorMessage); &nbsp; &nbsp; &nbsp;} &nbsp; &nbsp; catch (e) &nbsp; &nbsp; { &nbsp; &nbsp; &nbsp; Log.Message( "Exception caught"); &nbsp;&nbsp; &nbsp; &nbsp; } &nbsp; and in funcA() you should have something like &nbsp;try &nbsp; &nbsp; { operation1 operation2 ... operationn &nbsp; &nbsp; &nbsp; &nbsp;} &nbsp; &nbsp; catch (e) &nbsp; &nbsp; { &nbsp; &nbsp; &nbsp; return "exception" &nbsp;&nbsp; &nbsp; &nbsp; } &nbsp; or you can use false, -1, or what value you want

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Testcomplete 9.2 JScript Exception handling question.

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