Program: 65753
Project: 65753
Buggy source:
private String formatString(String str,ScalarParameter para){
  ScalarParameterHandle paraHandle=para.getHandle();
  String formatCategroy=paraHandle.getCategory();
  String formatPattern=paraHandle.getPattern();
  ULocale formatLocale=null;
  Object formatValue=paraHandle.getProperty(IScalarParameterModel.FORMAT_PROP);
  if (formatValue instanceof FormatValue) {
    PropertyHandle propHandle=paraHandle.getPropertyHandle(IScalarParameterModel.FORMAT_PROP);
    FormatValue formatValueToSet=(FormatValue)formatValue;
    FormatValueHandle formatHandle=(FormatValueHandle)formatValueToSet.getHandle(propHandle);
    formatLocale=formatHandle.getLocale();
  }
  if (formatLocale == null) {
    formatLocale=ULocale.getDefault();
  }
  String type=paraHandle.getDataType();
  formatPattern=isCustom(formatCategroy) ? formatPattern : formatCategroy;
  if (formatPattern == null) {
    return str;
  }
  String formatStr="String_Node_Str";
  try {
    if (DesignChoiceConstants.PARAM_TYPE_STRING.equals(type)) {
      formatStr=new StringFormatter(formatPattern,formatLocale).format(str);
    }
 else     if (DesignChoiceConstants.PARAM_TYPE_DATETIME.equals(type)) {
      formatPattern=formatPattern.equals(DesignChoiceConstants.DATETIEM_FORMAT_TYPE_UNFORMATTED) ? DateFormatter.DATETIME_UNFORMATTED : formatPattern;
      formatStr=new DateFormatter(formatPattern,formatLocale).format((Date)para.converToDataType(str));
    }
 else     if (DesignChoiceConstants.PARAM_TYPE_DATE.equals(type)) {
      formatPattern=formatPattern.equals(DesignChoiceConstants.DATE_FORMAT_TYPE_UNFORMATTED) ? DateFormatter.DATE_UNFORMATTED : formatPattern;
      formatStr=new DateFormatter(formatPattern,formatLocale).format((Date)para.converToDataType(str));
    }
 else     if (DesignChoiceConstants.PARAM_TYPE_TIME.equals(type)) {
      formatPattern=formatPattern.equals("String_Node_Str") ? DateFormatter.TIME_UNFORMATTED : formatPattern;
      formatStr=new DateFormatter(formatPattern,formatLocale).format((Date)para.converToDataType(str));
    }
 else     if (DesignChoiceConstants.PARAM_TYPE_DECIMAL.equals(type) || DesignChoiceConstants.PARAM_TYPE_FLOAT.equals(type)) {
      double value=Double.parseDouble(str);
      formatStr=new NumberFormatter(formatPattern,formatLocale).format(value);
    }
 else     if (DesignChoiceConstants.PARAM_TYPE_INTEGER.equals(type)) {
      int value=Integer.parseInt(str);
      formatStr=new NumberFormatter(formatPattern,formatLocale).format(value);
    }
  }
 catch (  Exception e) {
    formatStr=str;
  }
  if (formatStr == null) {
    return str;
  }
  return UIUtil.convertToGUIString(formatStr);
}

Fixed version (ground truth):
private String formatString(String str,ScalarParameter para){
  ScalarParameterHandle paraHandle=para.getHandle();
  String formatCategroy=paraHandle.getCategory();
  String formatPattern=paraHandle.getPattern();
  ULocale formatLocale=null;
  Object formatValue=paraHandle.getProperty(IScalarParameterModel.FORMAT_PROP);
  if (formatValue instanceof FormatValue) {
    PropertyHandle propHandle=paraHandle.getPropertyHandle(IScalarParameterModel.FORMAT_PROP);
    FormatValue formatValueToSet=(FormatValue)formatValue;
    FormatValueHandle formatHandle=(FormatValueHandle)formatValueToSet.getHandle(propHandle);
    formatLocale=formatHandle.getLocale();
  }
  if (formatLocale == null) {
    formatLocale=ULocale.getDefault();
  }
  String type=paraHandle.getDataType();
  formatPattern=isCustom(formatCategroy) ? formatPattern : formatCategroy;
  if (formatPattern == null) {
    return str;
  }
  String formatStr="String_Node_Str";
  try {
    if (DesignChoiceConstants.PARAM_TYPE_STRING.equals(type)) {
      formatStr=new StringFormatter(formatPattern,formatLocale).format(str);
    }
 else     if (DesignChoiceConstants.PARAM_TYPE_DATETIME.equals(type)) {
      formatPattern=formatPattern.equals(DesignChoiceConstants.DATETIEM_FORMAT_TYPE_UNFORMATTED) ? DateFormatter.DATETIME_UNFORMATTED : formatPattern;
      formatStr=new DateFormatter(formatPattern,formatLocale).format((Date)para.converToDataType(str));
    }
 else     if (DesignChoiceConstants.PARAM_TYPE_DATE.equals(type)) {
      formatPattern=formatPattern.equals(DesignChoiceConstants.DATE_FORMAT_TYPE_UNFORMATTED) ? DateFormatter.DATE_UNFORMATTED : formatPattern;
      formatStr=new DateFormatter(formatPattern,formatLocale).format((Date)para.converToDataType(str));
    }
 else     if (DesignChoiceConstants.PARAM_TYPE_TIME.equals(type)) {
      formatPattern=formatPattern.equals("String_Node_Str") ? DateFormatter.TIME_UNFORMATTED : formatPattern;
      formatStr=new DateFormatter(formatPattern,formatLocale).format((Date)para.converToDataType(str));
    }
 else     if (DesignChoiceConstants.PARAM_TYPE_DECIMAL.equals(type) || DesignChoiceConstants.PARAM_TYPE_FLOAT.equals(type)) {
      double value=Double.parseDouble(str);
      if (DesignChoiceConstants.NUMBER_FORMAT_TYPE_UNFORMATTED.equals(formatPattern)) {
        formatPattern=null;
      }
      formatStr=new NumberFormatter(formatPattern,formatLocale).format(value);
    }
 else     if (DesignChoiceConstants.PARAM_TYPE_INTEGER.equals(type)) {
      int value=Integer.parseInt(str);
      formatStr=new NumberFormatter(formatPattern,formatLocale).format(value);
    }
  }
 catch (  Exception e) {
    formatStr=str;
  }
  if (formatStr == null) {
    return str;
  }
  return UIUtil.convertToGUIString(formatStr);
}