Program: 52111
Project: 52111
Buggy source:
@Override public void reserveDOI(Context context,DSpaceObject dso,String doi) throws DOIIdentifierException {
  this.prepareXwalk();
  if (!this.xwalk.canDisseminate(dso)) {
    log.error("String_Node_Str" + this.CROSSWALK_NAME + "String_Node_Str"+ dso.getType()+ "String_Node_Str"+ dso.getID()+ "String_Node_Str"+ doi+ "String_Node_Str");
    throw new DOIIdentifierException("String_Node_Str" + dso.getTypeText() + "String_Node_Str"+ dso.getID()+ "String_Node_Str"+ this.CROSSWALK_NAME+ "String_Node_Str",DOIIdentifierException.CONVERSION_ERROR);
  }
  Element root=null;
  try {
    root=xwalk.disseminateElement(dso);
  }
 catch (  AuthorizeException ae) {
    log.error("String_Node_Str" + "String_Node_Str" + dso.getType() + "String_Node_Str"+ dso.getID()+ "String_Node_Str"+ doi+ "String_Node_Str",ae);
    throw new DOIIdentifierException("String_Node_Str" + "String_Node_Str" + dso.getTypeText() + "String_Node_Str"+ dso.getID()+ "String_Node_Str"+ this.CROSSWALK_NAME+ "String_Node_Str",ae,DOIIdentifierException.CONVERSION_ERROR);
  }
catch (  CrosswalkException ce) {
    log.error("String_Node_Str" + doi + "String_Node_Str"+ dso.getType()+ "String_Node_Str"+ dso.getID()+ "String_Node_Str",ce);
    throw new DOIIdentifierException("String_Node_Str" + "String_Node_Str" + dso.getTypeText() + "String_Node_Str"+ dso.getID()+ "String_Node_Str"+ this.CROSSWALK_NAME+ "String_Node_Str",ce,DOIIdentifierException.CONVERSION_ERROR);
  }
catch (  IOException ioe) {
    throw new RuntimeException(ioe);
  }
catch (  SQLException se) {
    throw new RuntimeException(se);
  }
  String metadataDOI=extractDOI(root);
  if (null == metadataDOI) {
    root=addDOI(doi,root);
  }
 else   if (!metadataDOI.equals(doi.substring(DOI.SCHEME.length()))) {
    throw new DOIIdentifierException("String_Node_Str" + dso.getTypeText() + "String_Node_Str"+ dso.getID()+ "String_Node_Str"+ metadataDOI+ "String_Node_Str"+ doi+ "String_Node_Str");
  }
  DataCiteResponse resp=this.sendMetadataPostRequest(doi,root);
switch (resp.getStatusCode()) {
case (201):
{
      return;
    }
case (400):
{
    log.warn("String_Node_Str");
    log.warn("String_Node_Str" + "String_Node_Str" + resp.getContent());
    Format format=Format.getCompactFormat();
    format.setEncoding("String_Node_Str");
    XMLOutputter xout=new XMLOutputter(format);
    log.info("String_Node_Str" + xout.outputString(root));
    throw new DOIIdentifierException("String_Node_Str" + doi + "String_Node_Str"+ "String_Node_Str",DOIIdentifierException.BAD_REQUEST);
  }
default :
{
  log.warn("String_Node_Str" + "String_Node_Str",new String[]{doi,Integer.toString(resp.statusCode),resp.getContent()});
  throw new DOIIdentifierException("String_Node_Str" + "String_Node_Str",DOIIdentifierException.BAD_ANSWER);
}
}
}

Fixed version (ground truth):
@Override public void reserveDOI(Context context,DSpaceObject dso,String doi) throws DOIIdentifierException {
  if (this.isDOIReserved(context,doi)) {
    if (!this.isDOIReserved(context,dso,doi)) {
      log.warn("String_Node_Str",doi);
      throw new DOIIdentifierException(DOIIdentifierException.DOI_ALREADY_EXISTS);
    }
  }
  this.prepareXwalk();
  if (!this.xwalk.canDisseminate(dso)) {
    log.error("String_Node_Str" + this.CROSSWALK_NAME + "String_Node_Str"+ dso.getType()+ "String_Node_Str"+ dso.getID()+ "String_Node_Str"+ doi+ "String_Node_Str");
    throw new DOIIdentifierException("String_Node_Str" + dso.getTypeText() + "String_Node_Str"+ dso.getID()+ "String_Node_Str"+ this.CROSSWALK_NAME+ "String_Node_Str",DOIIdentifierException.CONVERSION_ERROR);
  }
  Element root=null;
  try {
    root=xwalk.disseminateElement(dso);
  }
 catch (  AuthorizeException ae) {
    log.error("String_Node_Str" + "String_Node_Str" + dso.getType() + "String_Node_Str"+ dso.getID()+ "String_Node_Str"+ doi+ "String_Node_Str",ae);
    throw new DOIIdentifierException("String_Node_Str" + "String_Node_Str" + dso.getTypeText() + "String_Node_Str"+ dso.getID()+ "String_Node_Str"+ this.CROSSWALK_NAME+ "String_Node_Str",ae,DOIIdentifierException.CONVERSION_ERROR);
  }
catch (  CrosswalkException ce) {
    log.error("String_Node_Str" + doi + "String_Node_Str"+ dso.getType()+ "String_Node_Str"+ dso.getID()+ "String_Node_Str",ce);
    throw new DOIIdentifierException("String_Node_Str" + "String_Node_Str" + dso.getTypeText() + "String_Node_Str"+ dso.getID()+ "String_Node_Str"+ this.CROSSWALK_NAME+ "String_Node_Str",ce,DOIIdentifierException.CONVERSION_ERROR);
  }
catch (  IOException ioe) {
    throw new RuntimeException(ioe);
  }
catch (  SQLException se) {
    throw new RuntimeException(se);
  }
  String metadataDOI=extractDOI(root);
  if (null == metadataDOI) {
    root=addDOI(doi,root);
  }
 else   if (!metadataDOI.equals(doi.substring(DOI.SCHEME.length()))) {
    throw new DOIIdentifierException("String_Node_Str" + dso.getTypeText() + "String_Node_Str"+ dso.getID()+ "String_Node_Str"+ metadataDOI+ "String_Node_Str"+ doi+ "String_Node_Str");
  }
  DataCiteResponse resp=this.sendMetadataPostRequest(doi,root);
switch (resp.getStatusCode()) {
case (201):
{
      return;
    }
case (400):
{
    log.warn("String_Node_Str");
    log.warn("String_Node_Str" + "String_Node_Str" + resp.getContent());
    Format format=Format.getCompactFormat();
    format.setEncoding("String_Node_Str");
    XMLOutputter xout=new XMLOutputter(format);
    log.info("String_Node_Str" + xout.outputString(root));
    throw new DOIIdentifierException("String_Node_Str" + doi + "String_Node_Str"+ "String_Node_Str",DOIIdentifierException.BAD_REQUEST);
  }
default :
{
  log.warn("String_Node_Str" + "String_Node_Str",new String[]{doi,Integer.toString(resp.statusCode),resp.getContent()});
  throw new DOIIdentifierException("String_Node_Str" + "String_Node_Str",DOIIdentifierException.BAD_ANSWER);
}
}
}