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Predicting Defects for Eclipse

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Tim Menzies
Tim Menzies

Thomas Zimmermann, Rahul Premraj, Andres Zeller

Technology
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Predicting Defects for Eclipse for Eclipse ,[object Object],[object Object]
Summary Project  Eclipse (eclipse.org) Content Defect counts Complexity metrics Releases 2.0, 2.1, and 3.0 Level Packages and files URL www.st.cs.uni-sb.de/softevo/ More data Eclipse source code
Data Source Bugs Changes
Identifying Fixes ,[object Object],[object Object],[object Object],[object Object],Bugs Changes
Mapping Bugs ,[object Object],[object Object],[object Object],Bugs Changes
Eclipse Bugs
Obtaining Data
 
[object Object],[object Object],[object Object],[object Object],[object Object]
Predictions at Work
Eclipse Bug Data <?xml version=&quot;1.0&quot; encoding=&quot;UTF-8&quot;?> <!-- comments --> <defects project=&quot;eclipse&quot; release=&quot;2.0&quot; dataversion=&quot;1.0&quot;> <plug-in name=&quot;platform-launcher&quot;> <counts> <count id=&quot;pre&quot; value=&quot;0&quot; avg=&quot;0.0&quot; compilationunits=&quot;1&quot; max=&quot;0&quot;/> <count id=&quot;post&quot; value=&quot;0&quot; avg=&quot;0.0&quot; compilationunits=&quot;1&quot; max=&quot;0&quot;/> </counts> <package name=&quot;org.eclipse&quot;> <counts> <count id=&quot;pre&quot; value=&quot;0&quot; avg=&quot;0.0&quot; compilationunits=&quot;1&quot; max=&quot;0&quot;/> <count id=&quot;post&quot; value=&quot;0&quot; avg=&quot;0.0&quot; compilationunits=&quot;1&quot; max=&quot;0&quot;/> </counts> <package name=&quot;org.eclipse.core&quot;> <counts> <count id=&quot;pre&quot; value=&quot;0&quot; avg=&quot;0.0&quot; compilationunits=&quot;1&quot; max=&quot;0&quot;/> <count id=&quot;post&quot; value=&quot;0&quot; avg=&quot;0.0&quot; compilationunits=&quot;1&quot; max=&quot;0&quot;/> </counts> <package name=&quot;org.eclipse.core.launcher&quot;> <counts> <count id=&quot;pre&quot; value=&quot;0&quot; avg=&quot;0.0&quot; compilationunits=&quot;1&quot; max=&quot;0&quot;/> <count id=&quot;post&quot; value=&quot;0&quot; avg=&quot;0.0&quot; compilationunits=&quot;1&quot; max=&quot;0&quot;/> </counts> <compilationunit dir=&quot;/platform-launcher/library/&quot; base=&quot;Main.java&quot;> <counts> <count id=&quot;pre&quot; value=&quot;0&quot;/> <count id=&quot;post&quot; value=&quot;0&quot;/> </counts> </compilationunit> </package> </package> </package> </plug-in>
Eclipse Bug Data ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],<?xml version=&quot;1.0&quot; encoding=&quot;UTF-8&quot;?> <!-- comments --> <defects project=&quot;eclipse&quot; release=&quot;2.0&quot; dataversion=&quot;1.0&quot;> <plug-in name=&quot;platform-launcher&quot;> <counts> <count id=&quot;pre&quot; value=&quot;0&quot; avg=&quot;0.0&quot; compilationunits=&quot;1&quot; max=&quot;0&quot;/> <count id=&quot;post&quot; value=&quot;0&quot; avg=&quot;0.0&quot; compilationunits=&quot;1&quot; max=&quot;0&quot;/> </counts> <package name=&quot;org.eclipse&quot;> <counts> <count id=&quot;pre&quot; value=&quot;0&quot; avg=&quot;0.0&quot; compilationunits=&quot;1&quot; max=&quot;0&quot;/> <count id=&quot;post&quot; value=&quot;0&quot; avg=&quot;0.0&quot; compilationunits=&quot;1&quot; max=&quot;0&quot;/> </counts> <package name=&quot;org.eclipse.core&quot;> <counts> <count id=&quot;pre&quot; value=&quot;0&quot; avg=&quot;0.0&quot; compilationunits=&quot;1&quot; max=&quot;0&quot;/> <count id=&quot;post&quot; value=&quot;0&quot; avg=&quot;0.0&quot; compilationunits=&quot;1&quot; max=&quot;0&quot;/> </counts> <package name=&quot;org.eclipse.core.launcher&quot;> <counts> <count id=&quot;pre&quot; value=&quot;0&quot; avg=&quot;0.0&quot; compilationunits=&quot;1&quot; max=&quot;0&quot;/> <count id=&quot;post&quot; value=&quot;0&quot; avg=&quot;0.0&quot; compilationunits=&quot;1&quot; max=&quot;0&quot;/> </counts> <compilationunit dir=&quot;/platform-launcher/library/&quot; base=&quot;Main.java&quot;> <counts> <count id=&quot;pre&quot; value=&quot;0&quot;/> <count id=&quot;post&quot; value=&quot;0&quot;/> </counts> </compilationunit> </package> </package> </package> </plug-in>
Eclipse Bugs
Where do bugs come from?
Is it the Developers? Does experience matter? Bug density correlates with experience!
How about Testing? Does code coverage predict bug density? Yes – the more tests, the more bugs!
History? I found lots of bugs here. Will there be more? Yes!
How about Metrics? Do code metrics predict bug density? Yes! (but only with history)
Syntactic Tokens? Which tokens predict bug density? imports • extends • implements
Eclipse Imports import org.eclipse.jdt.internal.compiler.lookup.*; import org.eclipse.jdt.internal.compiler.*; import org.eclipse.jdt.internal.compiler.ast.*; import org.eclipse.jdt.internal.compiler.util.*; ... import org.eclipse.pde.core.*; import org.eclipse.jface.wizard.*; import org.eclipse.ui.*; 14% of all components importing ui show a post-release defect 71% of all components importing compiler show a post-release defect Joint work with Adrian Schröter • Tom Zimmermann
Eclipse Imports Correlation with failure Correlation with success import org.eclipse.jdt.internal.compiler.lookup.*; import org.eclipse.jdt.internal.compiler.*; import org.eclipse.jdt.internal.compiler.ast.*; import org.eclipse.jdt.internal.compiler.util.*; ... import org.eclipse.pde.core.*; import org.eclipse.jface.wizard.*; import org.eclipse.ui.*;
What makes code buggy in the first place?
Eclipse Bug Data ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],<?xml version=&quot;1.0&quot; encoding=&quot;UTF-8&quot;?> <!-- comments --> <defects project=&quot;eclipse&quot; release=&quot;2.0&quot; dataversion=&quot;1.0&quot;> <plug-in name=&quot;platform-launcher&quot;> <counts> <count id=&quot;pre&quot; value=&quot;0&quot; avg=&quot;0.0&quot; compilationunits=&quot;1&quot; max=&quot;0&quot;/> <count id=&quot;post&quot; value=&quot;0&quot; avg=&quot;0.0&quot; compilationunits=&quot;1&quot; max=&quot;0&quot;/> </counts> <package name=&quot;org.eclipse&quot;> <counts> <count id=&quot;pre&quot; value=&quot;0&quot; avg=&quot;0.0&quot; compilationunits=&quot;1&quot; max=&quot;0&quot;/> <count id=&quot;post&quot; value=&quot;0&quot; avg=&quot;0.0&quot; compilationunits=&quot;1&quot; max=&quot;0&quot;/> </counts> <package name=&quot;org.eclipse.core&quot;> <counts> <count id=&quot;pre&quot; value=&quot;0&quot; avg=&quot;0.0&quot; compilationunits=&quot;1&quot; max=&quot;0&quot;/> <count id=&quot;post&quot; value=&quot;0&quot; avg=&quot;0.0&quot; compilationunits=&quot;1&quot; max=&quot;0&quot;/> </counts> <package name=&quot;org.eclipse.core.launcher&quot;> <counts> <count id=&quot;pre&quot; value=&quot;0&quot; avg=&quot;0.0&quot; compilationunits=&quot;1&quot; max=&quot;0&quot;/> <count id=&quot;post&quot; value=&quot;0&quot; avg=&quot;0.0&quot; compilationunits=&quot;1&quot; max=&quot;0&quot;/> </counts> <compilationunit dir=&quot;/platform-launcher/library/&quot; base=&quot;Main.java&quot;> <counts> <count id=&quot;pre&quot; value=&quot;0&quot;/> <count id=&quot;post&quot; value=&quot;0&quot;/> </counts> </compilationunit> </package> </package> </package> </plug-in>

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Predicting Defects for Eclipse

  • 1.
  • 2. Summary Project  Eclipse (eclipse.org) Content Defect counts Complexity metrics Releases 2.0, 2.1, and 3.0 Level Packages and files URL www.st.cs.uni-sb.de/softevo/ More data Eclipse source code
  • 4.
  • 5.
  • 8.  
  • 9.
  • 11. Eclipse Bug Data <?xml version=&quot;1.0&quot; encoding=&quot;UTF-8&quot;?> <!-- comments --> <defects project=&quot;eclipse&quot; release=&quot;2.0&quot; dataversion=&quot;1.0&quot;> <plug-in name=&quot;platform-launcher&quot;> <counts> <count id=&quot;pre&quot; value=&quot;0&quot; avg=&quot;0.0&quot; compilationunits=&quot;1&quot; max=&quot;0&quot;/> <count id=&quot;post&quot; value=&quot;0&quot; avg=&quot;0.0&quot; compilationunits=&quot;1&quot; max=&quot;0&quot;/> </counts> <package name=&quot;org.eclipse&quot;> <counts> <count id=&quot;pre&quot; value=&quot;0&quot; avg=&quot;0.0&quot; compilationunits=&quot;1&quot; max=&quot;0&quot;/> <count id=&quot;post&quot; value=&quot;0&quot; avg=&quot;0.0&quot; compilationunits=&quot;1&quot; max=&quot;0&quot;/> </counts> <package name=&quot;org.eclipse.core&quot;> <counts> <count id=&quot;pre&quot; value=&quot;0&quot; avg=&quot;0.0&quot; compilationunits=&quot;1&quot; max=&quot;0&quot;/> <count id=&quot;post&quot; value=&quot;0&quot; avg=&quot;0.0&quot; compilationunits=&quot;1&quot; max=&quot;0&quot;/> </counts> <package name=&quot;org.eclipse.core.launcher&quot;> <counts> <count id=&quot;pre&quot; value=&quot;0&quot; avg=&quot;0.0&quot; compilationunits=&quot;1&quot; max=&quot;0&quot;/> <count id=&quot;post&quot; value=&quot;0&quot; avg=&quot;0.0&quot; compilationunits=&quot;1&quot; max=&quot;0&quot;/> </counts> <compilationunit dir=&quot;/platform-launcher/library/&quot; base=&quot;Main.java&quot;> <counts> <count id=&quot;pre&quot; value=&quot;0&quot;/> <count id=&quot;post&quot; value=&quot;0&quot;/> </counts> </compilationunit> </package> </package> </package> </plug-in>
  • 12.
  • 14. Where do bugs come from?
  • 15. Is it the Developers? Does experience matter? Bug density correlates with experience!
  • 16. How about Testing? Does code coverage predict bug density? Yes – the more tests, the more bugs!
  • 17. History? I found lots of bugs here. Will there be more? Yes!
  • 18. How about Metrics? Do code metrics predict bug density? Yes! (but only with history)
  • 19. Syntactic Tokens? Which tokens predict bug density? imports • extends • implements
  • 20. Eclipse Imports import org.eclipse.jdt.internal.compiler.lookup.*; import org.eclipse.jdt.internal.compiler.*; import org.eclipse.jdt.internal.compiler.ast.*; import org.eclipse.jdt.internal.compiler.util.*; ... import org.eclipse.pde.core.*; import org.eclipse.jface.wizard.*; import org.eclipse.ui.*; 14% of all components importing ui show a post-release defect 71% of all components importing compiler show a post-release defect Joint work with Adrian Schröter • Tom Zimmermann
  • 21. Eclipse Imports Correlation with failure Correlation with success import org.eclipse.jdt.internal.compiler.lookup.*; import org.eclipse.jdt.internal.compiler.*; import org.eclipse.jdt.internal.compiler.ast.*; import org.eclipse.jdt.internal.compiler.util.*; ... import org.eclipse.pde.core.*; import org.eclipse.jface.wizard.*; import org.eclipse.ui.*;
  • 22. What makes code buggy in the first place?
  • 23.