Add Instrumentation to the LibreOffice JVM

[Pierre Vacher]

Hi all,

I would like to add the Java Instrumentation
<https://docs.oracle.com/javase/8/docs/api/java/lang/instrument/Instrumentation.html>
API to the extensions running under LibreOffice and written in Java.

After some testing, I manage to load the Instrumentation
<https://docs.oracle.com/javase/8/docs/api/java/lang/instrument/Instrumentation.html>
agent at JVM startup, having taken care to add the necessary startup option
(ie:
-javaagent:/home/prrvchr/github/jdbcDriverOOo/source/UnoAgent/dist/UnoAgent.jar)
and put this archive in the classpath (ie: Tools -> Options -> LibreOffice
-> Advanced -> Java Options).

UnoAgent.jar is an archive containing only one class which itself contains
only two methods and this gives access to code injection and the
possibility of modifying the search path of the system bootloader. This
currently allows me to be able to deploy an SPI service type like
System.LoggerFinder,  and to be able to be the provider for the
System.Logger
<https://docs.oracle.com/en/java/javase/19/docs/api/java.base/java/lang/System.Logger.html>
interface for all running applications on the JVM.

If we want to make this feature accessible to any extension written in
Java, it is necessary to make three modifications: - Add the UnoAgent.jar
archive to the SDK. - Add an entry in the LibreOffice configuration (ie:
xcu file) to enable or disable instrumentation. - Load the JVM with the
parameters needed for instrumentation depending on the configuration.

Please let me know what you think about this.

Pierre
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