On 12/02/18 20:54, Rainer Jung wrote:
> Am 12.02.2018 um 21:36 schrieb Mark Thomas:
>> On 12/02/18 19:20, Rainer Jung wrote:
>>> I noticed some differences between my own builds and the binary
>>> distributions for TC 8.5. More precisely the classes I build for the
>>> examples are not binary identical to the ones distributed with out
>>> binary distribution.
>>> Normally I would not worry too much about binary differences, but
>>> previous experience told me, that the class file contents are pretty
>>> stable.
>>> The deltas started with 8.5.27. For 8.5.24 my build is consistent, but
>>> for 8.5.27 there are small changes. Example:
>>> File webapps/examples/WEB-INF/classes/async/Async0.class has size 2899
>>> Bytes in our binary distribution starting with 8.5.27, but size 2883
>>> until 8.5.24 and for both versions when I build it myself.
>>> I wonder whether there was a change on Mark's packaging system eg. from
>>> Java 7 to Java 8 or Java 9 (of course still compiling for Java 7)? Is
>>> this guess correct or do we know any other reason?
>> I use a dedicated VM for releases. Historically, I opted to do this
>> because I wanted to clean, consistent environment. These days it also
>> makes things easier as it allows my to do the release on Windows when my
>> main OS is Linux.
>> Apart from the usual Microsoft updates (I keep the VM up to date with
>> patches) which I doubt are relevant here, the only other recent change
>> is an update to Java 8 Update 162.
>> The Java update looks to be the most likely cause. A quick look in the
>> JAR manifests should confirm the Java version a release was built with.
> Ah, yes. And indeed: for example catalina.jar points at 1.7.0_80 for
> 8.5.24, at 1.8.0_144 for 8.5.27 and 1.8.0_162 for 8.5.28. So the change
> in the binary class observed by me was probably due to the change from
> Java 7 to Java 8 as the compilation environment (as I suspected).
> No worries, just wanted to understand it.

I should probably go back to Java 7 for the 8.5.x release. I can't think
of a good reason why I changed.


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