How to debug a D2W application

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The first step is to turn on D2W debug mode in your app Properties file (if it isn't already).

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Set:

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{{code language="none"}}er.extensions.ERXApplication.developmentMode = true{{/code}}

=== Walk-through ===

{{multimedia width="1280" att--filename="DebugRulesModernLook.mov" height="720"/}}

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== Advanced D2W Debugging ==

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One of the most common problems to occur in a D2W application is that your rule that you've added just doesn't seem to be processed.

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There is a very useful tool to find out what rules are being processed to compute values for D2W keys:

D2W rule tracing.

=== D2W Rule Tracing ===

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Probably the easiest way to get rule tracing output is to add the following property in your run configuration in Eclipse (it's in the WO-Tab):

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{{code language="none"}}-D2WTraceRuleFiringEnabled true{{/code}}

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When you run your application you will get output in the Eclipse console that looks like this:

Aug 10 08:50:17 ImmoData[56741] DEBUG NSLog - ****** fire : 0 : *true* => startupTask = queryAll (0)

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Aug 10 08:50:17 ImmoData[56741] DEBUG NSLog - ****** fire : 0 : *true* => startupEntityName = null (0)

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Aug 10 08:50:17 ImmoData[56741] DEBUG NSLog - ****** fire : 60 : (task = 'queryAll') => pageName = templateNameForQueryAllPage [er.directtoweb.assignments.ERDKeyValueAssignment] (60001)

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Aug 10 08:50:17 ImmoData[56741] DEBUG NSLog - ****** fire : 20 : *true* => templateNameForQueryAllPage = ERMODQueryEntitiesPage (20000)

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Aug 10 08:50:17 ImmoData[56741] DEBUG NSLog (null) - ****** fire : 0 : *true* => targetOutput = html (0)

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Aug 10 08:50:17 ImmoData[56741] DEBUG NSLog (null) - ****** fire : 0 : *true* => pageWrapperName = PageWrapper (0)

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Aug 10 08:50:17 ImmoData[56741] DEBUG NSLog (null) - ****** fire : 20 : (task = 'queryAll') => displayNameForPageConfiguration = Search All (20001)

Another way to turn on rule tracing is in your app {{code language="none"}}Properties{{/code}}:

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{{code language="none"}}log4j.logger.er.directtoweb.rules.ERD2WTraceRuleFiringEnabled = DEBUG{{/code}}

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Then say you were trying to debug what rule, or set of rules, were being processed to determing the {{code language="none"}}class{{/code}} string applied to a Diva look component, you set:

log4j.logger.er.directtoweb.rules.class.fire = DEBUG

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log4j.logger.er.directtoweb.rules.class.candidates = DEBUG

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log4j.logger.er.directtoweb.rules.class.cache = DEBUG

Now when you launch your application and navigate to the page and/or component in question, you will see in the Console output, the D2W rules fired to determine the {{code language="none"}}class{{/code}}.

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