I am looking to see how plausible it is to execute a block within a
child Classloader. A list of Jars would be passed to the ClassLoader to
load for the execution of the block. The problem I have is telling the
JRuby runtime to use the new classloader instead of the default. What I
have now is a bit of a hack, it manually uses a custom class loader.
The call to create(string class) uses it for constructing an instance.
An example of what I am attempting now:
email = LockJar::ClassLoader.new( 'tmp/IsolateJarfile.lock'
email = create( ‘org.apache.commons.mail.SimpleEmail’ )
email.setSubject( ‘test subject’ )
email.getSubject().should eql 'test subject'
This works, the SimpleEmail is created in the child ClassLoader. The
default JRuby classpath is not changed. The call to create(
‘org.apache.commons.mail.SimpleEmail’ ) is ugly. Ideally
'org.apache.commons.mail.SimpleEmail.new could be called and the JRuby
runtime would pull from the custom class loader instead of the default
JRuby classloader. I tried changing
Thread.currentThread().setContextClassLoader during the block execution,
but that did not work. I snooped around the JRuby source some, but could
not figure out a good way to hook into the ClassLoader. Any help or
advice is appreciated.
The simple custom classloader:
Ruby to load jars in isolation:
The green spec: