Since Apache Ant 1.7
The value of the ant.build.clonevm system property
controls how Ant instruments forked JVMs. The java
and junit tasks support clonevm
attributes to control JVMs on a task-by-task basis while the system
property applies to all forked JVMs.
If the value of the property is true
, then all system properties of
the forked JVM will be the same as those of the JVM running Ant. In
addition, if you set ant.build.clonevm to true
and build.sysclasspath has not been
set, the bootclasspath of forked JVMs gets constructed as
if build.sysclasspath had the value last
.
Note that this has to be a system property, so it cannot be
specified on the Ant command line. Use the ANT_OPTS
environment variable instead.