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.
Thanks and regards,
Rainer
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