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James,

On 1/31/17 8:48 PM, James H. H. Lampert wrote:
> On 1/31/17, 2:32 PM, Christopher Schultz wrote:
>>> But what about the "JVM Version" entry?
>> 
>> That comes directly from the "java.runtime.version" system
>> property, which I believe is read-only. (At least, you can't
>> override it when launching the JVM by providing a value for that
>> property using - -Djava.runtime.version=foobar). So that string
>> is coming from your JVM. It's opaque to Tomcat.
> . . .
>> If you do a "java -version" from the command-line, you'll
>> probably see that string in there, similar to what is shown on
>> this page:
> 
> Thanks. That answered it.
> 
> One other thing: I notice that in a couple of those customer 
> installations, I'm not getting the "VersionLoggerListener" messages
> at all. Is that from some logging level setting?

I can think of a few reasons why those lines might not be in the log:

1. Log level set to higher than INFO
2. VersionLoggerListener is not enabled in server.xml
3. Tomcat version is old enough that VLL isn't included

I suspect it's #2, and that the server.xml configuration pre-dates the
addition of VLL to Tomcat, and nobody ever noticed that it was
available and not configured.

If your customers are anything like me, I don't do a diff on my
server.xml against the stock server.xml unless I'm switching between
major versions of Tomcat. So it would be easy to overlook the addition
of the VersionLoggerListener, which was added to a point-release at
some point to both Tomcat 7 and 8.

- -chris
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