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André,
On 8/9/18 6:22 PM, André Warnier (tomcat) wrote:
>> The problem remains though : Under Windows, a Service has a
>> single executable, which Windows starts when starting the
>> Service, and then waits for that executable to send back a
>> message indicating that the Service has properly started.
>> Similarly, to stop the Service, Windows sends a message "please
>> stop" to that running executable, and waits for the executable to
>> acknowedge that it is stopping. With Tomcat, this executable is
>> "tomcatV.exe" (the renamed Apache Common wrapper). To my
>> knowledge, there is no provision in Windows for starting a
>> service by running one executable, and stopping it using
>> *another* executable.
This is true, but tomcatV.exe actually handles this correctly. But
there is a difference between "java" and "jvm" modes. Go back and read
Mark's message about it carefully, again; I had to do so myself before
I understood why it will work by switching modes.
>> So your suggestion above is indeed not usable for the Windows
>> Service context.
Correct. Even a self-contained "Tomcat-stopping win32 program"
wouldn't work in a Windows-service-context.
>> And thus, for stopping the Tomcat Service, the user is stuck
>> with tomcatV.exe, which uses the *same* JVM command-line
>> parameters whether it is to start or to stop tomcat.
Unless "jvm" mode is used.
>> A solution would be to add a separate options box to the
>> "Startup" and "Shutdown" tabs of the tomcat9w.exe dialog for
>> "additional JVM options at start" and "additional JVM options at
>> stop" (and of course all the associated plumbing in the wrapper
>> code). But I guess that this would go in the category of
>> "enhancement request".
Correct, but "jvm mode" should work with existing features.
>> I've seen Mark's previous answer, which seems to indicate that
>> there is actually another way, but I must confess that I did not
>> understand it.
If you use "java" mode, this is what happens:
Service launch:
1. Windows Service Manager invokes tomcatV.exe
2. tomcatV.exe reads registry for config
3. tomcatV.exe invokes "java [params] o.a.c.Bootstrap start"
Service shutdown:
1. Windows Service Manager invokes tomcatV.exe
2. tomcatV.exe reads registry for config
3. tomcatV.exe invokes "java [params] o.a.c.Bootstrap stop"
You see the problem because "[params]" are the same in both cases, and
the JMX port (and any other Java-specified ports, such as a profiling
agent, etc.) conflict.
If you use "jvm" mode, this is what happens:
Service launch:
1. Windows Service Manager invokes tomcatV.exe
2. tomcatV.exe reads registry for config
3. tomcatV.exe launches an in-process JVM with "[params]" and then
calls o.a.c.Bootstrap.main("start")
Service shutdown:
1. Windows Service Manager invokes tomcatV.exe
2. tomcatV.exe reads registry for config
3. tomcatV.exe calls o.a.c.Bootstrap.main("stop") on the
already-running in-process JVM
In the "jvm mode" case, only one JVM is launched for the start/stop
sequence instead of one JVM for each of start, stop.
So he port-conflict is avoided, and the system is more efficient
(launching a JVM is pretty expensive).
- -chris
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