In most cases, you're writing the Java classes you're calling via LS2J, so you get to decide whether there are static members. But maybe you got the class from elsewhere and you don't want to have to modify it, or maybe you're just using a built-in class that you don't get to change. So it may occasionally be helpful to know how to use the static members. So here goes.

You can invoke a static method of a Java class using the JavaMethod.Invoke method with an object argument of Nothing. First you need to get a handle to the method. So for instance, to invoke the static method HTTPPing, which takes a String argument and returns an int, I would write:

The second argument to Getmethod, the method signature, can be a bit hard to come up with. The example in the help shows a sample value of "(I)Ljava/lang/String;", but a single example isn't much help unless the method you want has exactly that signature (and the example seems to be wrong anyway). Rather than try to puzzle out what the right signature might be for the method, I wrote an agent to scan the methods of a JavaClass object and display all the signatures.

equals - '(Ljava/lang/Object;)Z' 
 hashCode - '()I' 
 toString - '()Ljava/lang/String;' 
 getClass - '()Ljava/lang/Class;' 
 notify - '()V' 
 notifyAll - '()V' 
 wait - '()V' 
 wait - '(J)V' 
 wait - '(JI)V' 
 ping - '(Ljava/lang/String;II)Z' 
 DNSLookup - '(Ljava/lang/String;)Ljava/lang/String;' 
 HTTPPing - '(Ljava/lang/String;)I'

So we can see from the last entry exactly what the signature argument should be.

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http://www-10.lotus.com/ldd/bpmpblog.nsf/dx/ls2j-static-method-calls
May 26, 2011
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