search

jpmml / r2pmml

R library for converting R models to PMML
GNU Affero General Public License v3.0
73 stars 18 forks source link

org/jpmml/converter/Main : Unsupported major.minor version 51.0 #2

Closed sjayanthi12 closed 9 years ago

sjayanthi12 commented 9 years ago

After installing r2pmml by following the instruction on README.MD, I was able to run my R code with following output:

Call: randomForest(formula = Species ~ ., data = iris, n.tree = 7) Type of random forest: classification Number of trees: 500 No. of variables tried at each split: 2

    OOB estimate of  error rate: 5.33%

Confusion matrix: setosa versicolor virginica class.error setosa 50 0 0 0.00 versicolor 0 46 4 0.08 virginica 0 4 46 0.08

However, I see an exception: Error in .jnew("org/jpmml/converter/Main") : java.lang.UnsupportedClassVersionError: org/jpmml/converter/Main : Unsupported major.minor version 51.0

Any thoughts?

vruusmann commented 9 years ago

The r2pmml package depends on the JPMML-Converter library, which requires Java 7 or newer to run.

You are getting this error, because your Java version is outdated. It must be Java 6 or older, because it does not recognize class files that are compiled for Java 7 (class file version 51.0). Please verify the version of your Java installation by executing the following command:

$ java -version

If you are indeed running Java 6, then it's time to upgrade, because its End-Of-Life (EOL) was in June 2013.

vruusmann commented 9 years ago

Anyway, this issue points out a need to improve package self-diagnostics. Will have to see if the rJava package that mediates R-to-Java communication provides a way to query Java version information and/or handle UnsupportedClassVersionErrors more graciously.

sjayanthi12 commented 9 years ago

I thought about it. So, updated the java version to 1.8. Still fact this issue. May be will do uninstall and install of library.

Thanks.

vruusmann commented 9 years ago

The r2pmml package uses whatever Java version is available via system path. If it still sees Java 1.6, then you need to "flush" your system path.

Did you restart your R development environment (RStudio perhaps?). If that doesn't help, try logging off/logging on again, or even restarting your computer.

sjayanthi12 commented 9 years ago

Thanks. The issue is java version. I have flush the old versions and I am able to generate pmml.