问题
I would like to specify a custom value for java.io.tmpdir in eclipse.ini file. Specifically, I need to have a username as part of the path.
I see the following entry in my eclipse.ini:
-Dosgi.instance.area.default=@user.home/eclipse-workspace
But when I try to use similar lines for my purpose:
-Djava.io.tmpdir=/tmp/eclipse_@user.name
-Djava.io.tmpdir=/tmp/eclipse_{@user.name}
-Djava.io.tmpdir=/tmp/eclipse_@{user.name}
-Djava.io.tmpdir=/tmp/@user.name
I end up with the following directories (literally):
/tmp/eclipse_@user.name
/tmp/eclipse_{@user.name}
/tmp/eclipse_@{user.name}
/tmp/@user.name
How could I specify my -D option so that @user.name is substituted with the actual username (e.g., john_doe)?
回答1:
The eclipse.ini does not support variable substitution.
The @user.home and @user.dir substitution is done by the Equinox location code and consequently is only supported for the Equinox location values which are:
osgi.install.area
osgi.configuration.area
osgi.configuration.area.default
osgi.instance.area
osgi.instance.area.default
osgi.user.area
osgi.user.area.default
The code that does this is org.eclipse.osgi.internal.location.EquinoxLocations
来源：https://stackoverflow.com/questions/51322680/how-to-reference-a-jvm-variable-in-eclipse-ini