JAR behaves differently when running in MATLAB - Throws error that cannot be reproduced outside MATLAB

I have a pretty basic JAR file that contains a single class. It handles some network stuff, mainly transferring files between a matlab client application and a server. I'm having some weird behavior that I can't quite explain. When I run a request to my server that I expect to return a 404, it works fine when just running a jUnit test in Eclipse. When I import the class into matlab and do the exact same thing I instead get:

??? Java exception occurred:
ice.net.URLNotFoundException: Document not found on server
  at ice.net.HttpURLConnection.getInputStream(OEAB)
  at ice.net.HttpURLConnection.getResponseCode(OEAB)
  at me.openconnecto.OcpUrl.query(OcpUrl.java:34)

This occurres when on the line where I am getting the response code:

this.responseCode = conn.getResponseCode();

I should still be able to get the response code even though I got a 404. Also I'm not using the ice library in my java code, so is MATLAB doing that instead of use just plain java.io*? Any tips from the java-matlab wiz's out there would be appreciated.

[Matt]

I'm having a similar problem with Java behaving differently inside MATLAB, described here

Did you find a solution to your issue?

Answer 1

[Malcolm Lidierth]

Are you using the same ice.net jar file in Eclipse & MATLAB? It ships with and is on the ML static jar path. Many jars shipped with MATLAB are legacy versions.

ice.net.URLNotFoundException sounds like a suitable exception to throw for 404.

[Dean]

No I'm just using the normal java.io.net libraries and would prefer to use those. In my class I read the response code and take some action before throwing an exception. I can try-catch around it, but it's kind of kludgy...is there a way to force MATLAB to not use the ice.net libraries?

[Malcolm Lidierth]

"at me.openconnecto.OcpUrl.query(OcpUrl.java:34)"

What is that, and where is that being called from?