org.renjin.eval.EvalException: lubridate could not be found at
org.renjin.primitives.packaging.NamespaceRegistry.load(NamespaceRegistry.java:83) at
org.renjin.primitives.packaging.NamespaceRegistry.getNamespace(NamespaceRegistry.java:63)
...
I think the function lubridate is not implemented in renjin? How can i know what functions are implemented?
Lubridate is actually an R package, not a function from R itself. You would need to include the jar for the lubridate package on your classpath.
Unfortunately, it appears that Renjin is not yet able to run this package: see http://packages.renjin.org/packages/lubridate.html for latest status of this and other packages.
Check back in a week or so for the next release candidate, we're fixing a lot of these problems.