Program: 23418
Project: 23418
Buggy source:
private ElementDefinitionMatch getElementDefinition(StructureDefinition sd,String path,boolean allowTypedName) throws PathEngineException {
  for (  ElementDefinition ed : sd.getSnapshot().getElement()) {
    if (ed.getPath().equals(path)) {
      if (ed.hasContentReference()) {
        return getElementDefinitionById(sd,ed.getContentReference());
      }
 else       return new ElementDefinitionMatch(ed,null);
    }
    if (ed.getPath().endsWith("String_Node_Str") && path.startsWith(ed.getPath().substring(0,ed.getPath().length() - 3)) && path.length() == ed.getPath().length() - 3)     return new ElementDefinitionMatch(ed,null);
    if (allowTypedName && ed.getPath().endsWith("String_Node_Str") && path.startsWith(ed.getPath().substring(0,ed.getPath().length() - 3))&& path.length() > ed.getPath().length() - 3) {
      String s=Utilities.uncapitalize(path.substring(ed.getPath().length() - 3));
      if (primitiveTypes.contains(s))       return new ElementDefinitionMatch(ed,s);
 else       return new ElementDefinitionMatch(ed,path.substring(ed.getPath().length() - 3));
    }
    if (ed.getPath().contains("String_Node_Str") && path.startsWith(ed.getPath() + "String_Node_Str") && (ed.getType().size() > 0)&& !isAbstractType(ed.getType())) {
      if (ed.getType().size() > 1)       throw new PathEngineException("String_Node_Str");
      StructureDefinition nsd=worker.fetchResource(StructureDefinition.class,"String_Node_Str" + ed.getType().get(0).getCode());
      if (nsd == null)       throw new PathEngineException("String_Node_Str" + ed.getType().get(0).getCode());
      return getElementDefinition(sd,sd.getId() + path.substring(ed.getPath().length()),allowTypedName);
    }
    if (ed.hasContentReference() && path.startsWith(ed.getPath() + "String_Node_Str")) {
      ElementDefinitionMatch m=getElementDefinitionById(sd,ed.getContentReference());
      return getElementDefinition(sd,m.definition.getPath() + path.substring(ed.getPath().length()),allowTypedName);
    }
  }
  return null;
}

Fixed version (ground truth):
private ElementDefinitionMatch getElementDefinition(StructureDefinition sd,String path,boolean allowTypedName) throws PathEngineException {
  for (  ElementDefinition ed : sd.getSnapshot().getElement()) {
    if (ed.getPath().equals(path)) {
      if (ed.hasContentReference()) {
        return getElementDefinitionById(sd,ed.getContentReference());
      }
 else       return new ElementDefinitionMatch(ed,null);
    }
    if (ed.getPath().endsWith("String_Node_Str") && path.startsWith(ed.getPath().substring(0,ed.getPath().length() - 3)) && path.length() == ed.getPath().length() - 3)     return new ElementDefinitionMatch(ed,null);
    if (allowTypedName && ed.getPath().endsWith("String_Node_Str") && path.startsWith(ed.getPath().substring(0,ed.getPath().length() - 3))&& path.length() > ed.getPath().length() - 3) {
      String s=Utilities.uncapitalize(path.substring(ed.getPath().length() - 3));
      if (primitiveTypes.contains(s))       return new ElementDefinitionMatch(ed,s);
 else       return new ElementDefinitionMatch(ed,path.substring(ed.getPath().length() - 3));
    }
    if (ed.getPath().contains("String_Node_Str") && path.startsWith(ed.getPath() + "String_Node_Str") && (ed.getType().size() > 0)&& !isAbstractType(ed.getType())) {
      if (ed.getType().size() > 1)       throw new PathEngineException("String_Node_Str");
      StructureDefinition nsd=worker.fetchResource(StructureDefinition.class,"String_Node_Str" + ed.getType().get(0).getCode());
      if (nsd == null)       throw new PathEngineException("String_Node_Str" + ed.getType().get(0).getCode());
      return getElementDefinition(nsd,nsd.getId() + path.substring(ed.getPath().length()),allowTypedName);
    }
    if (ed.hasContentReference() && path.startsWith(ed.getPath() + "String_Node_Str")) {
      ElementDefinitionMatch m=getElementDefinitionById(sd,ed.getContentReference());
      return getElementDefinition(sd,m.definition.getPath() + path.substring(ed.getPath().length()),allowTypedName);
    }
  }
  return null;
}