How to deal with a property file and EJB

Question

Hello,
I'm quite new to the EJB technology.
My problem is, how to handle a property file?
Let's say I have a custom 'property.xml' (that holds some application specific constants) somewhere in my EJB jar or in a related jar (so it is in the classapth).
Usually (not with EJB) I would write a class (let's name it 'Props', see below) which reads the property file once and initialize some public static members.
In an object (see below 'MyClass') I would then use 'Props.memberName' if I want to have access to a constant property.
class with public static constants members; read the file only once; properties are in memory ...
public class Props
  public static String FOO = null;
  static
    Properties props = new Properties();          
    try
      props.loadFromXML(CConstants.class.getClass().getClassLoader().getResourceAsStream("propertyFile.xml"));
      FOO = props.getProperty("FOO");
    catch(Exception e){...}
}The class that uses the properties<br>
public class MyClass
  public void doSomething()
    String s = Props.FOO + " BAR";
}But unfortunately static things are not allowed in EJB ...
What is the preferred way to get access to the properties?
To read the file each time an EJB is used, will cause much disc-I/O and xml parsing (this is very unefficient).
Is there no mechanism to read such things once only?
I would be very pleased to get an answer, because I don't know how to solve this problem
Thanks

Answer 1

Use the @Resource annotation on fields representing the application-specific constants. Override those values as you see fit with the standard ejb-jar.xml file's env-entry element.