Program: 9458
Project: 9458
Buggy source:
public boolean handleMessage(IMessage message) throws AbortException {
  if (!(message.isError() || message.isWarning()))   return sink.handleMessage(message);
  ISourceLocation sLoc=message.getSourceLocation();
  CompilationResult problemSource=currentlyWeaving;
  if (problemSource == null) {
    if (sLoc instanceof EclipseSourceLocation) {
      problemSource=((EclipseSourceLocation)sLoc).getCompilationResult();
    }
    if (problemSource == null) {
      return sink.handleMessage(message);
    }
  }
  int startPos=getStartPos(sLoc,problemSource);
  int endPos=getEndPos(sLoc,problemSource);
  int severity=message.isError() ? ProblemSeverities.Error : ProblemSeverities.Warning;
  char[] filename=problemSource.fileName;
  boolean usedBinarySourceFileName=false;
  if (problemSource.isFromBinarySource()) {
    if (sLoc != null) {
      filename=sLoc.getSourceFile().getPath().toCharArray();
      usedBinarySourceFileName=true;
    }
  }
  ReferenceContext referenceContext=findReferenceContextFor(problemSource);
  IProblem problem=compiler.problemReporter.createProblem(filename,IProblem.Unclassified,new String[0],new String[]{message.getMessage()},severity,startPos,endPos,sLoc != null ? sLoc.getLine() : 0,referenceContext,problemSource);
  IProblem[] seeAlso=buildSeeAlsoProblems(message.getExtraSourceLocations(),problemSource,usedBinarySourceFileName);
  problem.setSeeAlsoProblems(seeAlso);
  if (message.getDetails() != null) {
    problem.setSupplementaryMessageInfo(message.getDetails());
  }
  compiler.problemReporter.record(problem,problemSource,referenceContext);
  return true;
}

Fixed version (ground truth):
public boolean handleMessage(IMessage message) throws AbortException {
  if (!(message.isError() || message.isWarning()))   return sink.handleMessage(message);
  ISourceLocation sLoc=message.getSourceLocation();
  if (sLoc instanceof EclipseSourceLocation) {
    EclipseSourceLocation esLoc=(EclipseSourceLocation)sLoc;
    if (currentlyWeaving != null && esLoc.getCompilationResult() != null) {
      if (!currentlyWeaving.equals(((EclipseSourceLocation)sLoc).getCompilationResult()))       return sink.handleMessage(message);
    }
  }
  CompilationResult problemSource=currentlyWeaving;
  if (problemSource == null) {
    if (sLoc instanceof EclipseSourceLocation) {
      problemSource=((EclipseSourceLocation)sLoc).getCompilationResult();
    }
    if (problemSource == null) {
      return sink.handleMessage(message);
    }
  }
  int startPos=getStartPos(sLoc,problemSource);
  int endPos=getEndPos(sLoc,problemSource);
  int severity=message.isError() ? ProblemSeverities.Error : ProblemSeverities.Warning;
  char[] filename=problemSource.fileName;
  boolean usedBinarySourceFileName=false;
  if (problemSource.isFromBinarySource()) {
    if (sLoc != null) {
      filename=sLoc.getSourceFile().getPath().toCharArray();
      usedBinarySourceFileName=true;
    }
  }
  ReferenceContext referenceContext=findReferenceContextFor(problemSource);
  IProblem problem=compiler.problemReporter.createProblem(filename,IProblem.Unclassified,new String[0],new String[]{message.getMessage()},severity,startPos,endPos,sLoc != null ? sLoc.getLine() : 0,referenceContext,problemSource);
  IProblem[] seeAlso=buildSeeAlsoProblems(message.getExtraSourceLocations(),problemSource,usedBinarySourceFileName);
  problem.setSeeAlsoProblems(seeAlso);
  if (message.getDetails() != null) {
    problem.setSupplementaryMessageInfo(message.getDetails());
  }
  compiler.problemReporter.record(problem,problemSource,referenceContext);
  return true;
}