Program: 40367
Project: 40367
Buggy source:
@Override public void serialize(Resource value,JsonGenerator gen,SerializerProvider serializers) throws IOException {
  if (gen.getOutputContext().getParent() == null) {
    value._context=Resource.CONTEXT;
  }
  String containingField=getContainingField(gen);
  String typeBackup=null;
  if (ImmutableSet.of("String_Node_Str","String_Node_Str").contains(containingField)) {
    ImageContent imgContent=(ImageContent)value;
    typeBackup=imgContent._type;
    imgContent._type=null;
  }
  Completeness completeness=ModelUtilities.getCompleteness(value,value.getClass());
  if (Objects.equals(containingField,"String_Node_Str") && completeness == ModelUtilities.Completeness.ID_AND_TYPE) {
    completeness=ModelUtilities.Completeness.ID_ONLY;
  }
  if (Objects.equals(containingField,"String_Node_Str") && completeness == ModelUtilities.Completeness.ID_AND_TYPE) {
    String parentType=((Resource)gen.getCurrentValue()).getType();
    String withinType=value.getType();
    boolean skipType=((parentType.equals("String_Node_Str") && withinType.equals("String_Node_Str")) || (parentType.equals("String_Node_Str") && withinType.equals("String_Node_Str")) || (parentType.equals("String_Node_Str") && withinType.equals("String_Node_Str")));
    if (skipType) {
      completeness=ModelUtilities.Completeness.ID_ONLY;
    }
  }
 else   if (Objects.equals(containingField,"String_Node_Str") && completeness == ModelUtilities.Completeness.ID_AND_TYPE) {
    boolean skipType=(value instanceof Canvas && gen.getCurrentValue() instanceof Annotation && ((Annotation)gen.getCurrentValue()).getMotivation().equals(Motivation.PAINTING));
    if (skipType) {
      completeness=ModelUtilities.Completeness.ID_ONLY;
    }
  }
 else {
    ImmutableSet<String> skipParents=ImmutableSet.of("String_Node_Str","String_Node_Str","String_Node_Str");
    boolean shouldSkip=(Arrays.asList("String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str").contains(containingField) || (completeness == Completeness.ID_AND_TYPE && skipParents.contains(containingField)));
    if (shouldSkip) {
      completeness=Completeness.ID_ONLY;
    }
  }
switch (completeness) {
case EMPTY:
    gen.writeNull();
  break;
case ID_ONLY:
gen.writeObject(value.getIdentifier().toString());
break;
default :
defaultSerializer.serialize(value,gen,serializers);
}
if (typeBackup != null) {
((ImageContent)value)._type=typeBackup;
}
}

Fixed version (ground truth):
@Override public void serialize(Resource value,JsonGenerator gen,SerializerProvider serializers) throws IOException {
  if (gen.getOutputContext().getParent() == null) {
    value._context=Resource.CONTEXT;
  }
  String containingField=getContainingField(gen);
  String typeBackup=null;
  if (ImmutableSet.of("String_Node_Str","String_Node_Str").contains(containingField)) {
    ImageContent imgContent=(ImageContent)value;
    typeBackup=imgContent._type;
    imgContent._type=null;
  }
  Completeness completeness=ModelUtilities.getCompleteness(value,value.getClass());
  if (Objects.equals(containingField,"String_Node_Str") && completeness == ModelUtilities.Completeness.ID_AND_TYPE) {
    completeness=ModelUtilities.Completeness.ID_ONLY;
  }
  if (Objects.equals(containingField,"String_Node_Str") && completeness == ModelUtilities.Completeness.ID_AND_TYPE) {
    String parentType=null;
    if (gen.getCurrentValue() != null) {
      parentType=((Resource)gen.getCurrentValue()).getType();
    }
    String withinType=value.getType();
    boolean skipType=(("String_Node_Str".equals(parentType) && "String_Node_Str".equals(withinType)) || ("String_Node_Str".equals(parentType) && "String_Node_Str".equals(withinType)) || ("String_Node_Str".equals(parentType) && "String_Node_Str".equals(withinType)));
    if (skipType) {
      completeness=ModelUtilities.Completeness.ID_ONLY;
    }
  }
 else   if (Objects.equals(containingField,"String_Node_Str") && completeness == ModelUtilities.Completeness.ID_AND_TYPE) {
    boolean skipType=(value instanceof Canvas && gen.getCurrentValue() instanceof Annotation && Objects.equals(((Annotation)gen.getCurrentValue()).getMotivation(),Motivation.PAINTING));
    if (skipType) {
      completeness=ModelUtilities.Completeness.ID_ONLY;
    }
  }
 else {
    ImmutableSet<String> skipParents=ImmutableSet.of("String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str");
    boolean shouldSkip=(Arrays.asList("String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str").contains(containingField) || (completeness == Completeness.ID_AND_TYPE && skipParents.contains(containingField)));
    if (shouldSkip) {
      completeness=Completeness.ID_ONLY;
    }
  }
switch (completeness) {
case EMPTY:
    gen.writeNull();
  break;
case ID_ONLY:
gen.writeObject(value.getIdentifier().toString());
break;
default :
defaultSerializer.serialize(value,gen,serializers);
}
if (typeBackup != null) {
((ImageContent)value)._type=typeBackup;
}
}