SXC

[Jonathan Gallimore <jo...@gmail.com>]

I'm doing some more work around running the build in Java 11. I have a
quick question - we have a dependency called SXC. Anyone know what it is?
It looks like a JAXB implementation. Could we use it as opposed to pulling
in org.glassfish.jaxb:jaxb-runtime?

Jon

Re: SXC

[David Blevins <da...@gmail.com>]

> On Feb 5, 2019, at 8:45 AM, Jean-Louis Monteiro <jl...@tomitribe.com> wrote:
> 
> It has been added a while back when David did some performance
> investigations around startup. He realized that Jaxb starts becoming fast
> after some iterations but for TomEE, we read descriptors at startup and
> then we are done. So we were paying the cost of all the JAXB code
> generation without really using it.
> 
> So David trying SXC to generate the getter and setter and use a SAX handler
> to parse the file.
> That's the only thing I recall but I can look for more information

You nailed it.  Data here is I recall the reflection that JAXB does to read all the annotations of a JAXB model that doesn't change only once a few years accounted for about 500 milliseconds of our startup.  Meaning, there is no hope of a sub-second startup for TomEE as long as JAXB is in the picture.

Here's the thread with my "notes to my future self" as that's the only way I can remember this kind of thing years out.

 - https://lists.apache.org/thread.html/f14796bacfa82edb249c4f186e471c1056e5dea3d164741937f89086@1355118735@%3Cdev.tomee.apache.org%3E
 - https://github.com/apache/tomee/commit/4c475bd33f63188d45dda38d00b7f9d8df890c85#diff-d6802cbea6446e0c24100d09b32da8c4

As for SXC, here is the archived codehaus.org page that describes where it was at:

 - http://web.archive.org/web/20120622083901/http://sxc.codehaus.org/JAXB

What I seem to recall is changing approach at some point and seeing if I could get the JAXB classes that are generated by the RI in some way saved to disk so we could avoid the reflection and generation and instead have them simply there from the beginning.  I unfortunately didn't take good notes on that or I used an email subject that doesn't allow me to find them.


-David

Re: SXC

[Jean-Louis Monteiro <jl...@tomitribe.com>]

It has been added a while back when David did some performance
investigations around startup. He realized that Jaxb starts becoming fast
after some iterations but for TomEE, we read descriptors at startup and
then we are done. So we were paying the cost of all the JAXB code
generation without really using it.

So David trying SXC to generate the getter and setter and use a SAX handler
to parse the file.
That's the only thing I recall but I can look for more information
--
Jean-Louis Monteiro
http://twitter.com/jlouismonteiro
http://www.tomitribe.com


On Tue, Feb 5, 2019 at 2:35 PM Jonathan Gallimore <
jonathan.gallimore@gmail.com> wrote:

> I'm doing some more work around running the build in Java 11. I have a
> quick question - we have a dependency called SXC. Anyone know what it is?
> It looks like a JAXB implementation. Could we use it as opposed to pulling
> in org.glassfish.jaxb:jaxb-runtime?
>
> Jon
>