Program: 139501
Project: 139501
Buggy source:
public boolean execute(){
  IProject rootProject=ResourceManager.getRootProject();
  IFolder libraryFolder=rootProject.getFolder(ResourceManager.LIBRARIES_FOLDER_NAME);
  try {
    IFolder oldPatternFolder=libraryFolder.getFolder(DQStructureManager.PATTERNS);
    IFolder newPatternFolder=libraryFolder.getFolder(DQStructureManager.PATTERNS);
    String folderProperty=DQStructureManager.PATTERNS_FOLDER_PROPERTY;
    IFolder newRegexSubfolder=createSubfolder(newPatternFolder,DQStructureManager.REGEX,folderProperty);
    movePatternsIntoPatternsRegex(oldPatternFolder,newRegexSubfolder,folderProperty);
    IFolder oldSqlPatternsFolder=libraryFolder.getFolder(DQStructureManager.SQL_PATTERNS);
    IFolder newSqlSubfolder=DQStructureManager.getInstance().createNewReadOnlyFolder(newPatternFolder,DQStructureManager.SQL);
    folderProperty=DQStructureManager.SQLPATTERNS_FOLDER_PROPERTY;
    movePatternsIntoPatternsRegex(oldSqlPatternsFolder,newSqlSubfolder,folderProperty);
    oldSqlPatternsFolder.delete(true,null);
    IFolder oldDqRulesFolder=libraryFolder.getFolder(DQStructureManager.DQ_RULES);
    IFolder newRulesFolder=createSubfolder(libraryFolder,DQStructureManager.RULES,folderProperty);
    folderProperty=DQStructureManager.DQRULES_FOLDER_PROPERTY;
    IFolder newRulesSQLSubfolder=createSubfolder(newRulesFolder,DQStructureManager.SQL,folderProperty);
    movePatternsIntoPatternsRegex(oldDqRulesFolder,newRulesSQLSubfolder,folderProperty);
    oldDqRulesFolder.delete(true,null);
    rootProject.refreshLocal(IResource.DEPTH_INFINITE,null);
  }
 catch (  CoreException e) {
    ExceptionHandler.process(e);
    return false;
  }
  return true;
}

Fixed version (ground truth):
public boolean execute(){
  IProject rootProject=ResourceManager.getRootProject();
  IFolder libraryFolder=rootProject.getFolder(ResourceManager.LIBRARIES_FOLDER_NAME);
  try {
    IFolder oldPatternFolder=libraryFolder.getFolder(DQStructureManager.PATTERNS);
    IFolder newPatternFolder=libraryFolder.getFolder(DQStructureManager.PATTERNS);
    String folderProperty=DQStructureManager.PATTERNS_FOLDER_PROPERTY;
    IFolder newRegexSubfolder=createSubfolder(newPatternFolder,DQStructureManager.REGEX,folderProperty);
    moveItems(oldPatternFolder,newRegexSubfolder,folderProperty);
    IFolder oldSqlPatternsFolder=libraryFolder.getFolder(DQStructureManager.SQL_PATTERNS);
    IFolder newSqlSubfolder=DQStructureManager.getInstance().createNewReadOnlyFolder(newPatternFolder,DQStructureManager.SQL);
    folderProperty=DQStructureManager.SQLPATTERNS_FOLDER_PROPERTY;
    moveItems(oldSqlPatternsFolder,newSqlSubfolder,folderProperty);
    oldSqlPatternsFolder.delete(true,null);
    IFolder oldDqRulesFolder=libraryFolder.getFolder(DQStructureManager.DQ_RULES);
    IFolder newRulesFolder=createSubfolder(libraryFolder,DQStructureManager.RULES,folderProperty);
    folderProperty=DQStructureManager.DQRULES_FOLDER_PROPERTY;
    IFolder newRulesSQLSubfolder=createSubfolder(newRulesFolder,DQStructureManager.SQL,folderProperty);
    moveItems(oldDqRulesFolder,newRulesSQLSubfolder,folderProperty);
    oldDqRulesFolder.delete(true,null);
    rootProject.refreshLocal(IResource.DEPTH_INFINITE,null);
  }
 catch (  CoreException e) {
    ExceptionHandler.process(e);
    return false;
  }
  return true;
}