Keith Hatton wrote:
Two more robust solutions spring to mind:
1. You can use Properties.getProperty(String,String) to prevent your
NPE. The first string is the property name, the second is a default
value to be used when the property is not present.
http://java.sun.com/j2se/1.5.0/docs/api/java/util/Properties.html#getPro
perty(java.lang.String,%20java.lang.String)
2. Check for null values in your code - and if the property is mandatory
but missing, then throw an appropriate exception to the user.
3. override the method in a subclass of Property
String getProperty(String name) {
String value=super.getProperty(name);
if(value==null) throw new IllegalArgumentException("No property
"+name+" in +this);
return value;
}
What you may want to do is have a constant defined for every property
name. So you cannot misspell the property string. I'd use <xslt> to
create the java source from an XML template; its how I generate
constants. There is an example for this in the forthcoming Ant in Action
book...
-steve
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