This method can be used in UDF to read the parameters from GlobalContainer instance

getGlobalParameter.java

public String getGlobalParameter(String Parameter, Container container) throws StreamTransformationException{
  String ParameterValue = "";
  try{
    GlobalContainer gc = container.getGlobalContainer();
    ParameterValue = (String) gc.getParameter(parameter);
  }catch(Exception ee){
    ParameterValue = "";
  }
  return ParameterValue;
}