Program: 12385
Project: 12385
Buggy source:
/** 
 * @param SBOLDoc
 * @param topLevel
 * @param nested
 * @return
 */
@SuppressWarnings("String_Node_Str") private static Implementation parseImplementation(SBOLDocument SBOLDoc,IdentifiableDocument<QName> topLevel,Map<URI,NestedDocument<QName>> nested) throws SBOLValidationException {
  String displayId=null;
  String name=null;
  String description=null;
  URI persistentIdentity=null;
  URI built=null;
  String version=null;
  Set<URI> wasDerivedFroms=new HashSet<>();
  List<Annotation> annotations=new ArrayList<>();
  for (  NamedProperty<QName> namedProperty : topLevel.getProperties()) {
    if (namedProperty.getName().equals(Sbol2Terms.Identified.version)) {
      if (!(namedProperty.getValue() instanceof Literal) || version != null || (!(((Literal<QName>)namedProperty.getValue()).getValue() instanceof String))) {
        throw new SBOLValidationException("String_Node_Str",topLevel.getIdentity());
      }
      version=((Literal<QName>)namedProperty.getValue()).getValue().toString();
    }
 else     if (namedProperty.getName().equals(Sbol2Terms.Identified.persistentIdentity)) {
      if (!(namedProperty.getValue() instanceof Literal) || persistentIdentity != null || (!(((Literal<QName>)namedProperty.getValue()).getValue() instanceof URI))) {
        throw new SBOLValidationException("String_Node_Str",topLevel.getIdentity());
      }
      persistentIdentity=URI.create(((Literal<QName>)namedProperty.getValue()).getValue().toString());
    }
 else     if (namedProperty.getName().equals(Sbol2Terms.Implementation.built)) {
      if (namedProperty.getValue() instanceof Literal) {
        if (!(((Literal<QName>)namedProperty.getValue()).getValue() instanceof URI)) {
          throw new SBOLValidationException("String_Node_Str",topLevel.getIdentity());
        }
        built=URI.create(((Literal<QName>)namedProperty.getValue()).getValue().toString());
      }
 else       if (namedProperty.getValue() instanceof IdentifiableDocument) {
        if (((IdentifiableDocument<QName>)namedProperty).getType().equals(Sbol2Terms.Implementation.Implementation)) {
          Implementation imp=parseImplementation(SBOLDoc,(IdentifiableDocument<QName>)namedProperty.getValue(),nested);
          built=imp.getIdentity();
        }
 else {
          throw new SBOLValidationException("String_Node_Str",topLevel.getIdentity());
        }
      }
 else {
        throw new SBOLValidationException("String_Node_Str",topLevel.getIdentity());
      }
    }
 else     if (namedProperty.getName().equals(Sbol2Terms.Identified.displayId)) {
      if (!(namedProperty.getValue() instanceof Literal) || displayId != null || (!(((Literal<QName>)namedProperty.getValue()).getValue() instanceof String))) {
        throw new SBOLValidationException("String_Node_Str",topLevel.getIdentity());
      }
      displayId=((Literal<QName>)namedProperty.getValue()).getValue().toString();
    }
 else     if (namedProperty.getName().equals(Sbol2Terms.Identified.title)) {
      if (!(namedProperty.getValue() instanceof Literal) || name != null || (!(((Literal<QName>)namedProperty.getValue()).getValue() instanceof String))) {
        throw new SBOLValidationException("String_Node_Str",topLevel.getIdentity());
      }
      name=((Literal<QName>)namedProperty.getValue()).getValue().toString();
    }
 else     if (namedProperty.getName().equals(Sbol2Terms.Identified.description)) {
      if (!(namedProperty.getValue() instanceof Literal) || description != null || (!(((Literal<QName>)namedProperty.getValue()).getValue() instanceof String))) {
        throw new SBOLValidationException("String_Node_Str",topLevel.getIdentity());
      }
      description=((Literal<QName>)namedProperty.getValue()).getValue().toString();
    }
 else     if (namedProperty.getName().equals(Sbol2Terms.Identified.wasDerivedFrom)) {
      if (!(namedProperty.getValue() instanceof Literal) || (!(((Literal<QName>)namedProperty.getValue()).getValue() instanceof URI))) {
        throw new SBOLValidationException("String_Node_Str",topLevel.getIdentity());
      }
      wasDerivedFroms.add(URI.create(((Literal<QName>)namedProperty.getValue()).getValue().toString()));
    }
 else {
      annotations.add(new Annotation(namedProperty));
    }
  }
  Implementation i=new Implementation(topLevel.getIdentity());
  if (displayId != null)   i.setDisplayId(displayId);
  if (persistentIdentity != null)   i.setPersistentIdentity(persistentIdentity);
  if (name != null)   i.setName(name);
  if (description != null)   i.setDescription(description);
  if (!annotations.isEmpty())   i.setAnnotations(annotations);
  if (version != null)   i.setVersion(version);
  i.setWasDerivedFroms(wasDerivedFroms);
  Implementation oldI=SBOLDoc.getImplementation(topLevel.getIdentity());
  if (oldI == null) {
    SBOLDoc.addImplementation(i);
  }
 else {
    if (!i.equals(oldI)) {
      throw new SBOLValidationException("String_Node_Str",i);
    }
  }
  return i;
}

Fixed version (ground truth):
/** 
 * @param SBOLDoc
 * @param topLevel
 * @param nested
 * @return
 */
@SuppressWarnings("String_Node_Str") private static Implementation parseImplementation(SBOLDocument SBOLDoc,IdentifiableDocument<QName> topLevel,Map<URI,NestedDocument<QName>> nested) throws SBOLValidationException {
  String displayId=null;
  String name=null;
  String description=null;
  URI persistentIdentity=null;
  URI built=null;
  String version=null;
  Set<URI> wasDerivedFroms=new HashSet<>();
  List<Annotation> annotations=new ArrayList<>();
  for (  NamedProperty<QName> namedProperty : topLevel.getProperties()) {
    if (namedProperty.getName().equals(Sbol2Terms.Identified.version)) {
      if (!(namedProperty.getValue() instanceof Literal) || version != null || (!(((Literal<QName>)namedProperty.getValue()).getValue() instanceof String))) {
        throw new SBOLValidationException("String_Node_Str",topLevel.getIdentity());
      }
      version=((Literal<QName>)namedProperty.getValue()).getValue().toString();
    }
 else     if (namedProperty.getName().equals(Sbol2Terms.Identified.persistentIdentity)) {
      if (!(namedProperty.getValue() instanceof Literal) || persistentIdentity != null || (!(((Literal<QName>)namedProperty.getValue()).getValue() instanceof URI))) {
        throw new SBOLValidationException("String_Node_Str",topLevel.getIdentity());
      }
      persistentIdentity=URI.create(((Literal<QName>)namedProperty.getValue()).getValue().toString());
    }
 else     if (namedProperty.getName().equals(Sbol2Terms.Implementation.built)) {
      if (namedProperty.getValue() instanceof Literal) {
        if (!(((Literal<QName>)namedProperty.getValue()).getValue() instanceof URI)) {
          throw new SBOLValidationException("String_Node_Str",topLevel.getIdentity());
        }
        built=URI.create(((Literal<QName>)namedProperty.getValue()).getValue().toString());
      }
 else       if (namedProperty.getValue() instanceof IdentifiableDocument) {
        if (((IdentifiableDocument<QName>)namedProperty).getType().equals(Sbol2Terms.Implementation.Implementation)) {
          Implementation imp=parseImplementation(SBOLDoc,(IdentifiableDocument<QName>)namedProperty.getValue(),nested);
          built=imp.getIdentity();
        }
 else {
          throw new SBOLValidationException("String_Node_Str",topLevel.getIdentity());
        }
      }
 else {
        throw new SBOLValidationException("String_Node_Str",topLevel.getIdentity());
      }
    }
 else     if (namedProperty.getName().equals(Sbol2Terms.Identified.displayId)) {
      if (!(namedProperty.getValue() instanceof Literal) || displayId != null || (!(((Literal<QName>)namedProperty.getValue()).getValue() instanceof String))) {
        throw new SBOLValidationException("String_Node_Str",topLevel.getIdentity());
      }
      displayId=((Literal<QName>)namedProperty.getValue()).getValue().toString();
    }
 else     if (namedProperty.getName().equals(Sbol2Terms.Identified.title)) {
      if (!(namedProperty.getValue() instanceof Literal) || name != null || (!(((Literal<QName>)namedProperty.getValue()).getValue() instanceof String))) {
        throw new SBOLValidationException("String_Node_Str",topLevel.getIdentity());
      }
      name=((Literal<QName>)namedProperty.getValue()).getValue().toString();
    }
 else     if (namedProperty.getName().equals(Sbol2Terms.Identified.description)) {
      if (!(namedProperty.getValue() instanceof Literal) || description != null || (!(((Literal<QName>)namedProperty.getValue()).getValue() instanceof String))) {
        throw new SBOLValidationException("String_Node_Str",topLevel.getIdentity());
      }
      description=((Literal<QName>)namedProperty.getValue()).getValue().toString();
    }
 else     if (namedProperty.getName().equals(Sbol2Terms.Identified.wasDerivedFrom)) {
      if (!(namedProperty.getValue() instanceof Literal) || (!(((Literal<QName>)namedProperty.getValue()).getValue() instanceof URI))) {
        throw new SBOLValidationException("String_Node_Str",topLevel.getIdentity());
      }
      wasDerivedFroms.add(URI.create(((Literal<QName>)namedProperty.getValue()).getValue().toString()));
    }
 else {
      annotations.add(new Annotation(namedProperty));
    }
  }
  Implementation i=new Implementation(topLevel.getIdentity());
  if (displayId != null)   i.setDisplayId(displayId);
  if (persistentIdentity != null)   i.setPersistentIdentity(persistentIdentity);
  if (name != null)   i.setName(name);
  if (description != null)   i.setDescription(description);
  if (!annotations.isEmpty())   i.setAnnotations(annotations);
  if (version != null)   i.setVersion(version);
  if (built != null)   i.setBuiltURI(built);
  i.setWasDerivedFroms(wasDerivedFroms);
  Implementation oldI=SBOLDoc.getImplementation(topLevel.getIdentity());
  if (oldI == null) {
    SBOLDoc.addImplementation(i);
  }
 else {
    if (!i.equals(oldI)) {
      throw new SBOLValidationException("String_Node_Str",i);
    }
  }
  return i;
}