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Bug 338569

Summary: Not found problem with customized settings makes Codan Preference UI unusable
Product: [Tools] CDT Reporter: Alex Ruiz <alruiz>
Component: cdt-codanAssignee: Sergey Prigogin <eclipse.sprigogin>
Status: RESOLVED FIXED QA Contact: Elena Laskavaia <elaskavaia.cdt>
Severity: normal    
Priority: P3 CC: alruiz, cdtdoug, eclipse.sprigogin
Version: 8.0   
Target Milestone: 8.0   
Hardware: PC   
OS: Linux   
Whiteboard:
Attachments:
Description Flags
Proposed patch eclipse.sprigogin: iplog+

Description Alex Ruiz CLA 2011-03-01 13:20:26 EST 
Build Identifier: 20110204-0611

Let's say I have my own custom codan checker installed in X instance of Eclipse+CDT. I make configuration changes to the problems provided by that checker (e.g. I configure them to "run in editor" only.) Now I open the same workspace with Y instance of Eclipse+CDT that does not have my custom codan checker and I go to the codan preference UI. I will get error "The currently displayed page contains invalid values" and I won't be able to see any configuration settings for the checkers that do exist in this instance of Eclipse.

I got the following stack trace in the console:
org.eclipse.core.runtime.AssertionFailedException: null argument:
	at org.eclipse.core.runtime.Assert.isNotNull(Assert.java:85)
	at org.eclipse.core.runtime.Assert.isNotNull(Assert.java:73)
	at org.eclipse.jface.viewers.StructuredSelection.<init>(StructuredSelection.java:74)
	at org.eclipse.cdt.codan.internal.ui.preferences.CodanPreferencePage.restoreWidgetValues(CodanPreferencePage.java:189)

The problem is that CodanPreferencePage does not check in "restoreWidgetValues" if the found problem is null, before passing it to the StructuredSelection constructor.

The fix is easy, just check for null before creating the StructuredSelection. Everything works fine after that. 

I'm attaching a patch.

Reproducible: Always

Steps to Reproduce:
1. Create a C/C++ project and change settings for a problem in the Codan Preference UI
2. Close Eclipse.
3. Remove the problem that was configured before from plugin.xml in the project 'org.eclipse.cdt.codan.checkers'
4. Restart Eclipse, opening same workspace as in #1
5. Go to the codan preference UI
6. Boom! Error!
Comment 1 Alex Ruiz CLA 2011-03-01 13:21:13 EST 
Created attachment 190068 [details]
Proposed patch

Proposed solution.
Comment 2 Sergey Prigogin CLA 2011-03-04 18:16:00 EST 
Fixed in HEAD > 20110304.
Comment 3 CDT Genie CLA 2011-03-04 18:23:10 EST 
*** cdt cvs genie on behalf of sprigogin ***
Bug 338569 - Not found problem with customized settings makes Codan Preference UI unusable. Patch by Alex Ruiz.

[*] CodanPreferencePage.java 1.28 http://dev.eclipse.org/viewcvs/index.cgi/org.eclipse.cdt/codan/org.eclipse.cdt.codan.ui/src/org/eclipse/cdt/codan/internal/ui/preferences/CodanPreferencePage.java?root=Tools_Project&r1=1.27&r2=1.28