Program: 185102
Project: 185102
Buggy source:
/** 
 * Get a Part (except a relationships part), and all its related parts.   This can be called directly from outside the library, in which case  the Part will not be owned by a Package until the calling code makes it so.  
 * @param zf
 * @param source
 * @param unusedZipEntries
 * @param pkg
 * @param r
 * @param resolvedPartUri
 * @throws Docx4JException
 * @throws InvalidFormatException
 */
private void getPart(ZipFile zf,OpcPackage pkg,RelationshipsPart rp,Relationship r,ContentTypeManager ctm) throws Docx4JException, InvalidFormatException, URISyntaxException {
  Base source=null;
  String resolvedPartUri=null;
  if (r.getTargetMode() == null || !r.getTargetMode().equals("String_Node_Str")) {
    source=rp.getSourceP();
    resolvedPartUri=URIHelper.resolvePartUri(rp.getSourceURI(),new URI(r.getTarget())).toString();
    resolvedPartUri=resolvedPartUri.substring(1);
  }
 else {
    if (loadExternalTargets && r.getType().equals(Namespaces.IMAGE)) {
      log.warn("String_Node_Str" + r.getTarget() + "String_Node_Str"+ r.getType());
      BinaryPart bp=ExternalResourceUtils.getExternalResource(r.getTarget());
      pkg.getExternalResources().put(bp.getExternalTarget(),bp);
    }
 else {
      log.warn("String_Node_Str" + r.getTarget() + "String_Node_Str"+ r.getType());
    }
    return;
  }
  if (pkg.handled.get(resolvedPartUri) != null)   return;
  String relationshipType=r.getType();
  Part part=getRawPart(zf,ctm,resolvedPartUri,r);
  if (part instanceof BinaryPart || part instanceof DefaultXmlPart) {
    part.setRelationshipType(relationshipType);
  }
  rp.loadPart(part,r);
  pkg.handled.put(resolvedPartUri,resolvedPartUri);
  if (source.setPartShortcut(part,relationshipType)) {
    log.info("String_Node_Str" + source.getPartName() + "String_Node_Str"+ part.getPartName());
  }
  RelationshipsPart rrp=getRelationshipsPart(zf,part);
  if (rrp != null) {
    addPartsFromRelationships(zf,part,rrp,ctm);
    String relPart=PartName.getRelationshipsPartName(part.getPartName().getName().substring(1));
  }
}

Fixed version (ground truth):
/** 
 * Get a Part (except a relationships part), and all its related parts.   This can be called directly from outside the library, in which case  the Part will not be owned by a Package until the calling code makes it so.  
 * @param zf
 * @param source
 * @param unusedZipEntries
 * @param pkg
 * @param r
 * @param resolvedPartUri
 * @throws Docx4JException
 * @throws InvalidFormatException
 */
private void getPart(ZipFile zf,OpcPackage pkg,RelationshipsPart rp,Relationship r,ContentTypeManager ctm) throws Docx4JException, InvalidFormatException, URISyntaxException {
  Base source=null;
  String resolvedPartUri=null;
  if (r.getType().equals(Namespaces.HYPERLINK)) {
    log.info("String_Node_Str" + r.getTarget());
    return;
  }
 else   if (r.getTargetMode() == null || !r.getTargetMode().equals("String_Node_Str")) {
    source=rp.getSourceP();
    resolvedPartUri=URIHelper.resolvePartUri(rp.getSourceURI(),new URI(r.getTarget())).toString();
    resolvedPartUri=resolvedPartUri.substring(1);
  }
 else {
    if (loadExternalTargets && r.getType().equals(Namespaces.IMAGE)) {
      log.warn("String_Node_Str" + r.getTarget() + "String_Node_Str"+ r.getType());
      BinaryPart bp=ExternalResourceUtils.getExternalResource(r.getTarget());
      pkg.getExternalResources().put(bp.getExternalTarget(),bp);
    }
 else {
      log.warn("String_Node_Str" + r.getTarget() + "String_Node_Str"+ r.getType());
    }
    return;
  }
  if (pkg.handled.get(resolvedPartUri) != null)   return;
  String relationshipType=r.getType();
  Part part=getRawPart(zf,ctm,resolvedPartUri,r);
  if (part instanceof BinaryPart || part instanceof DefaultXmlPart) {
    part.setRelationshipType(relationshipType);
  }
  rp.loadPart(part,r);
  pkg.handled.put(resolvedPartUri,resolvedPartUri);
  if (source.setPartShortcut(part,relationshipType)) {
    log.info("String_Node_Str" + source.getPartName() + "String_Node_Str"+ part.getPartName());
  }
  RelationshipsPart rrp=getRelationshipsPart(zf,part);
  if (rrp != null) {
    addPartsFromRelationships(zf,part,rrp,ctm);
    String relPart=PartName.getRelationshipsPartName(part.getPartName().getName().substring(1));
  }
}