Steve Arch (sarch) wrote:
I've found a bit more explanation. You are indeed correct - AWS has their own
custom tomcat startup scripts that override the default tomcat startup scripts
to handle the quotes. The yum update reverts to the default tomcat scripts and
introduces the ambiguity.
Thanks for the help.
Steve
-----Original Message-----
From: Christopher Schultz [mailto:ch...@christopherschultz.net]
Sent: Thursday, October 03, 2013 4:25 PM
To: Tomcat Users List
Subject: Re: Different handling of -Dfoo="bar" between versions
Steve,
On 10/3/13 11:12 AM, Steve Arch (sarch) wrote:
AWS's tools pass the values to tomcat.
This is not an adequate description. Tomcat must be launched by some
mechanism, such as the java executable, JSVC service wrapper, class
loading from some already >running Java application, etc. What's
being used here?
OK, in this case 'magic' is being used. The running process is:
/usr/lib/jvm/jre/bin/java -Dfoo="bar" -XX:MaxPermSize=64m -Xmx256m
-Xms256m -classpath
/usr/share/tomcat7/bin/bootstrap.jar:/usr/share/tomcat7/bin/tomcat-jul
i.jar:/usr/share/java/commons-daemon.jar
-Dcatalina.base=/usr/share/tomcat7 -Dcatalina.home=/usr/share/tomcat7
-Djava.endorsed.dirs= -Djava.io.tmpdir=/var/cache/tomcat7/temp
-Djava.util.logging.config.file=/usr/share/tomcat7/conf/logging.proper
ties
...
I think that the basic misunderstanding here is simply this :
The executable program that is being launched by the above command-line is not
Tomcat.
It is "/usr/lib/jvm/jre/bin/java".
All the rest of the command-line options and parameters are options and
parameters for
"/usr/lib/jvm/jre/bin/java", and are parsed by "/usr/lib/jvm/jre/bin/java".
Including the -Dfoo="bar".
Correction : what you see with the "ps" display is the command that was used to launch
that process, *after* the original command-line was parsed by whatever shell was in use.
So if that shell was a Unix shell, the original command-line may have included
(as one of the possibilities) '-Dfoo="bar"' (or : -Dfoo=\"bar\" - and there are a few more
esoteric possibilities too).
In any case, java reads the -Dfoo="bar", and sets the corresponding internal java system
property.
And then, later, java "runs tomcat".
And then, later, some java code in Tomcat asks for the value of the property "foo", and
gets this value from the JVM that is running it (/usr/lib/jvm/jre/bin/java).
And it gets whatever the JVM thinks it is.
If the JVM thinks it is bar, then Tomcat gets bar. If the JVM thinks it is "bar", then
Tomcat will get "bar".
So it has nothing to do with Tomcat per se or any of its versions.
It happens "before".
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