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Ravikumar Babu CTOO

Ravikumar Babu CTOO

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titleCouldn't get data from DB for an app

Check for the following pattern in the error logs:

Code Block
linenumberstrue
[com.intellectdesign.canvas.viewdefinition.SimpleViewDefinitionInstruction][ERROR]
				 {[CTVDF00386]:Database Exception occurred in fetchData() while retrieving the View data for the view id : SOME_VIEW_ID}

Solution:

  • Check the app's datasource and the its response.
  • At the end of the stack trace, check the root cause mentioned in the "Caused by:" section.


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titleCouldn't get data from Web Service for an app

Check for the following pattern in the error logs:

Code Block
linenumberstrue
[com.intellectdesign.canvas.connectors.camel.DefaultRoute][ERROR]
			 {[CTVDF00933]:Caught Exception while making a web service call {}}

Solution: Check the stack trace to find the details of the web service that did not return the success response.


Encryption

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titleHow to enable encryption of business data, request and response between client and server in the application built using Canvas?

You can enable encryption for the application built using Canvas by setting the 'ENCRYPT_SERVER_CALLS' property to 'Y' in the 'systempreferences.properties' file.

Note

When you enable encryption, Canvas will encrypt all requests coming to your application including log out.

A sample 'systempreferences.properties' file is available in CTModelHouseResource.jar in the Model House application that comes as part of the Canvas platform package.

Note that you must stop and start your application server to enable this feature. After the application server is restarted, access the widgets in the application and check the Network tab in the browser console to verify the encryption.

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