web service - apache/tomcat - soap - java

Can any one help me here?

I have an application that uses SOAP and JNLP. Clients with Java 1.4.2 
everything works fine but under Java1.5 the SOAP calls take forever to 
complete (each is about 4 seconds and there are often a lot of SOAP calls)

My webserver is Tomcat 5.5.12
I'm not sure of my soap version, but i believe it is 2.3 (.1? how can i 
find out)
I have Java 1.5 and 1.4 installed and Tomcat uses Java 1.5 - I compile 
my classes for Java 1.4 but I really want Java 5 to work.
My soap services are deployed and correctly displayed with the SOAP 
admin page.

What kind of java 5 soap incomptability might i have found here? can 
anyone help me.  I know that AXIS has replaced SOAP but there are a lot 
of SOAP calls that I don't want to rewrite...

B.t.w. from my local computer this problem doesn't happen - Java 1.5 
works correctly - it is only when it is on a different computer (even on 
the intranet) that i have problems.

Any ideas

Thanks

Martin
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