On Feb 28, 2013, at 5:09 PM, Bunny wrote:
> Dear devel-listers,
>
> I found a conflct between rJava and data.table. Actually me questions is
> where to report it?
> Should I rather send it directly to the package maintainers or post it on
> some bug tracker.
> The problem is that data.table has a function called "J" and rJava uses the
> same quite intensively.
> I used the xlsx R package which depends on rJava to write .xls files and ran
> into an error.
>
> write.xls from this package uses the functions and returns an error depending
> on the sequence the packages
> were loaded.
>
>
> Error in .jnew("org/apache/poi/xssf/usermodel/XSSFWorkbook") :
> java.lang.AbstractMethodError:
> java.lang.ClassLoader.loadClass(Ljava/lang/String;)Ljava/lang/Class;
>
>
> data.table::J
> rJava::J
>
> I can work around this by loading and unloading packages, but I feel this
> should be addressed because
> loading these two packages that both deal with tables of data does not seem
> that unlikely to me.
>
Can you elaborate on the details as of where this will be a problem? Packages
should not be affected since they should be importing the namespaces from the
packages they use, so the only problem would be in a package that uses both
data.table and rJava -- and this is easily resolved in the namespace of such
package. So there is no technical reason why you can't have multiple
definitions of J - that's what namespaces are for.
The error you report is entirely unrelated to J -- at lest in isolation. If you
have a reproducible example, please share it.
Cheers,
Simon
> best
>
> matt
>
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