Java related (?) problems with RWeka

[Derek White]

Hello all,

I am attempting to run an R script that makes use of RWeka.  I am
running SuSE Linux 9.3 with Java 1.5.0_06, R version 2.2.1, Weka
3-4-7, and Rweka 0.2-1.

CLASSPATH="/usr/local/weka-3-4-7/weka.jar:/usr/local/JGR/JGR.jar"

I receive the error:

NewObject("weka/core/Instances","(Ljava/io/Reader;)V",...) failed
Exception in thread "main" java.io.IOException: end of line expected,
read Token[=], line 1
        at weka.core.Instances.errms(Unknown Source)
        at weka.core.Instances.getLastToken(Unknown Source)
        at weka.core.Instances.readHeader(Unknown Source)
        at weka.core.Instances.<init>(Unknown Source)
Error in validObject(.Object) : invalid class "jobjRef" object:
invalid object for slot "jobj" in class "jobjRef": got class "NULL",
should be or extend class "externalptr"
In addition: Warning message:
Unable to create object of the class weka/core/Instances , returning
null reference. in: .jnew("weka/core/Instances", .jcast(reader,
"java/io/Reader"))
Execution halted


My R script seems to run fine on Windows XP.

Thanks in advance,
Derek