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I’ve posted this in the past, but I ran into scalability problems with Object streams when writing a custom transport for JBoss. It boils down to some static variables being synchronized within java.io.ObjectStreamClass

/** cache mapping local classes -> descriptors */
private static final SoftCache localDescs = new SoftCache(10);
/** cache mapping field group/local desc pairs -> field reflectors */
private static final SoftCache reflectors = new SoftCache(10);

I walked through some hoops to change the use of SoftCache to a ConcurrentReaderHashMap and throughput started increasing 20-40% depending on how many threads you run through it. It is not an issue if you’re just marshalling primitives, but becomes an issue of course if you’re marshalling objects. I have the code for this, but it is a derivative of JDK 1.4 source which means it is illegal to distribute. Email me if you want it. I’m interested in any legal work-around if you have one.

I’d also be interested in incorporating some of your research into a JBoss transport. Email if you’re interested and I’ll point you to the appropriate example code.

Bill

Could just be expressed as (minute detail):

@Location("/hotel/reservations/${r.id}")
public Reservation book(@QueryParam("room") int room);