Hi Chris,
On 23.04.2021 05:12, Christopher Schultz wrote:
> On 4/21/21 08:53, Rony G. Flatscher (Apache) wrote:
>> Hi Chris,
>>
>> On 20.04.2021 16:47, Christopher Schultz wrote:
>> ... cut ...
>> When bringing non-Java binaries into the picture then they work in the
>> process environment where
>>>> e.g. PATH defines which directories are looked up for finding executables
>>>> (which might be
>>>> important
>>>> for some natives) and on Windows DLLs, and in Linux and MacOS shared
>>>> libraries need to be found by
>>>> the non-Java native code. Hence the desire to allow setting up the process
>>>> environment before
>>>> starting up Tomcat in a simple, but effective way.
>>>
>>> You may want to do a Google search for "java.library.path".
>>
>> have been aware of (and using) "java.library.path" for quite some time, it
>> does not do for natives
>> what it does for the JVM. E.g. adding a path via something like
>>
>> -Djava.library.path="%PATH%;x:\some\path" |
>> -Djava.library.path="${PATH}:/some/path"
>>
>> does not change the process environment variable PATH accordingly (adding
>> "x:\some\path" |
>> "/some/path" to the PATH environment variable) such that a native library
>> can issue a command that
>> will be looked for in addition in "x:\some\path" | "/some/path" (just tested
>> it again on Windows
>> with Java 8).
>
> Do you mean when you call exec() or similar (yuck!) or do you mean loading
> dependencies for your
> native library?
There are scenarios where the former is done in the context of the native
binaries (not from Java).
> If you have native dependencies for your shared library, you should also put
> them into the
> java.library.path.
>
> If you are calling exec() or system() or anything like that from your Java
> code:
No, not from the Java code, but may be a valid scenario from/via the native
binaries.
> 1. Don't
> 2. Don't use the PATH environment variable; always use full paths
There are scenarios where PATH becomes relevant (again for native binaries, not
Java).
>>>> However, with CATALINA_OPTS you brought the startup/stop|shutdown/catalina
>>>> scripts into the
>>>> picture,
>>>> which might be a possible solution (though being very wary
>>>> altering/tampering such fundamental
>>>> scripts).
>>>
>>> I didn't suggest that you modify those scripts. I only suggested that you
>>> use an environment
>>> variable that those scripts are aware of.
>>>
>>> Typically, admins will create a bin/setenv.sh script which sets all
>>> environment variables
>>> necessary for local operation. You could even change the PATH variable --
>>> if you really want to do
>>> that -- there.
>>
>> Thank you very much for this pointer, seeing "setenv.{sh|bat}" being
>> exercised in the Tomcat
>> supplied scripts, if it exists!
>
> That's why it's there.
:)
How about services/daemons?
> You can even set $PATH in there if you really want to.
Yes, indeed, which got me a little bit excited. :)
---rony
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