Program: 185129
Project: 185129
Buggy source:
/** 
 * Remove a part from this package, including its relationships part and all target parts. Do so recursively.  If this part is relationship part, then delete all relationships in the source part.
 * @param partName The part name of the part to remove.
 */
public void removePart(PartName partName){
  log.info("String_Node_Str" + partName.getName());
  if (partName == null)   throw new IllegalArgumentException("String_Node_Str");
  Part part=getPackage().getParts().get(partName);
  if (part != null) {
    Relationship relToBeRemoved=null;
    for (    Relationship rel : relationships.getRelationship()) {
      URI resolvedTargetURI=null;
      try {
        resolvedTargetURI=org.docx4j.openpackaging.URIHelper.resolvePartUri(sourceP.partName.getURI(),new URI(rel.getTarget()));
      }
 catch (      URISyntaxException e) {
        log.error("String_Node_Str" + rel.getTarget() + "String_Node_Str",e);
      }
      log.debug("String_Node_Str" + resolvedTargetURI + "String_Node_Str"+ partName.getName());
      if (partName.getName().equals(resolvedTargetURI.toString())) {
        log.info("String_Node_Str" + rel.getTarget());
        relToBeRemoved=rel;
        break;
      }
    }
    if (relToBeRemoved == null) {
      throw new IllegalArgumentException(partName + "String_Node_Str" + this.partName);
    }
 else {
      removeRelationship(relToBeRemoved);
    }
    if (part.getRelationshipsPart() != null) {
      part.getRelationshipsPart().removeParts();
    }
    getPackage().getParts().remove(partName);
  }
}

Fixed version (ground truth):
/** 
 * Remove a part from this package, including its relationships part and all target parts. Do so recursively.  If this part is relationship part, then delete all relationships in the source part.
 * @param partName The part name of the part to remove.
 */
public void removePart(PartName partName){
  log.info("String_Node_Str" + partName.getName());
  if (partName == null)   throw new IllegalArgumentException("String_Node_Str");
  Part part=getPackage().getParts().get(partName);
  if (part != null) {
    Relationship relToBeRemoved=null;
    for (    Relationship rel : relationships.getRelationship()) {
      if (rel.getTargetMode() != null && rel.getTargetMode().equals("String_Node_Str")) {
        continue;
      }
      URI resolvedTargetURI=null;
      try {
        resolvedTargetURI=org.docx4j.openpackaging.URIHelper.resolvePartUri(sourceP.partName.getURI(),new URI(rel.getTarget()));
      }
 catch (      URISyntaxException e) {
        log.error("String_Node_Str" + rel.getTarget() + "String_Node_Str",e);
      }
      log.debug("String_Node_Str" + resolvedTargetURI + "String_Node_Str"+ partName.getName());
      if (partName.getName().equals(resolvedTargetURI.toString())) {
        log.info("String_Node_Str" + rel.getTarget());
        relToBeRemoved=rel;
        break;
      }
    }
    if (relToBeRemoved == null) {
      throw new IllegalArgumentException(partName + "String_Node_Str" + this.partName);
    }
 else {
      removeRelationship(relToBeRemoved);
    }
    if (part.getRelationshipsPart() != null) {
      part.getRelationshipsPart().removeParts();
    }
    getPackage().getParts().remove(partName);
  }
}