Program: 18327
Project: 18327
Buggy source:
public void handleEvent(Event event){
  EventContext ctx=event.getContext();
  if (!(ctx instanceof DocumentEventContext)) {
    return;
  }
  CoreSession session=ctx.getCoreSession();
  DocumentModel doc=((DocumentEventContext)ctx).getSourceDocument();
  if (doc == null) {
    return;
  }
  String type=doc.getType();
  if (!type.equals(DOCTYPE)) {
    return;
  }
  String url=null, server=null, environment=null;
  try {
    url=(String)doc.getProperty(SCHEMA,PROP_URL);
    server=(String)doc.getProperty(SCHEMA,PROP_SERVER);
    environment=(String)doc.getProperty(SCHEMA,PROP_ENVIRONMENT);
    if (url != null && !url.isEmpty() && (server == null || server.isEmpty())) {
      try {
        url=PropertyNormalizer.normalizeUrl(url);
        doc.setProperty(SCHEMA,PROP_URL,url);
        server=new URL(url).getHost();
        doc.setProperty(SCHEMA,PROP_SERVER,server);
        doc.setProperty(SCHEMA,PROP_SERVERENTRY,doc.getProperty(SCHEMA,PROP_ENVIRONMENT) + "String_Node_Str" + server);
      }
 catch (      MalformedURLException e) {
        log.error("String_Node_Str" + url + "String_Node_Str");
      }
    }
    if (environment == null || environment.isEmpty()) {
      doc.setProperty(SCHEMA,PROP_ENVIRONMENT,DEFAULT_ENVIRONMENT);
    }
  }
 catch (  Exception e) {
    log.error("String_Node_Str",e);
  }
  try {
    if (environment == null) {
      environment=DEFAULT_ENVIRONMENT;
    }
    VocabularyHelper vocService=Framework.getRuntime().getService(VocabularyHelper.class);
    if (!vocService.entryExists(session,VocabularyHelper.VOCABULARY_ENVIRONMENT,environment)) {
      vocService.addEntry(session,VocabularyHelper.VOCABULARY_ENVIRONMENT,environment,environment);
    }
    if (server != null && !server.isEmpty() && !vocService.entryExists(session,VocabularyHelper.VOCABULARY_SERVER,server)) {
      vocService.addEntry(session,VocabularyHelper.VOCABULARY_SERVER,server,server,environment);
    }
  }
 catch (  ClientException e) {
    log.error("String_Node_Str",e);
  }
}

Fixed version (ground truth):
public void handleEvent(Event event){
  EventContext ctx=event.getContext();
  if (!(ctx instanceof DocumentEventContext)) {
    return;
  }
  CoreSession session=ctx.getCoreSession();
  DocumentModel doc=((DocumentEventContext)ctx).getSourceDocument();
  if (doc == null) {
    return;
  }
  String type=doc.getType();
  if (!type.equals(DOCTYPE)) {
    return;
  }
  String url=null, server=null, environment=null;
  try {
    url=(String)doc.getProperty(SCHEMA,PROP_URL);
    server=(String)doc.getProperty(SCHEMA,PROP_SERVER);
    environment=(String)doc.getProperty(SCHEMA,PROP_ENVIRONMENT);
    if (url != null && !url.isEmpty() && (server == null || server.isEmpty())) {
      try {
        url=PropertyNormalizer.normalizeUrl(url);
        doc.setProperty(SCHEMA,PROP_URL,url);
        server=new URL(url).getHost();
        doc.setProperty(SCHEMA,PROP_SERVER,server);
        doc.setProperty(SCHEMA,PROP_SERVERENTRY,doc.getProperty(SCHEMA,PROP_ENVIRONMENT) + "String_Node_Str" + server);
      }
 catch (      MalformedURLException e) {
        log.warn("String_Node_Str" + url + "String_Node_Str");
      }
    }
    if (environment == null || environment.isEmpty()) {
      doc.setProperty(SCHEMA,PROP_ENVIRONMENT,DEFAULT_ENVIRONMENT);
    }
  }
 catch (  Exception e) {
    log.error("String_Node_Str",e);
  }
  try {
    if (environment == null) {
      environment=DEFAULT_ENVIRONMENT;
    }
    VocabularyHelper vocService=Framework.getRuntime().getService(VocabularyHelper.class);
    if (!vocService.entryExists(session,VocabularyHelper.VOCABULARY_ENVIRONMENT,environment)) {
      vocService.addEntry(session,VocabularyHelper.VOCABULARY_ENVIRONMENT,environment,environment);
    }
    if (server != null && !server.isEmpty() && !vocService.entryExists(session,VocabularyHelper.VOCABULARY_SERVER,server)) {
      vocService.addEntry(session,VocabularyHelper.VOCABULARY_SERVER,server,server,environment);
    }
  }
 catch (  ClientException e) {
    log.error("String_Node_Str",e);
  }
}