"problem using SVDReduction in java code"

Legacy User

Hi,

My question is regarding the exception stated below:

=====================================================================================
Exception in thread "main" java.lang.NoClassDefFoundError: Jama/Matrix
at com.rapidminer.operator.features.transformation.JamaDimensionalityReduction.dimensionalityReduction(JamaDimensionalityReduction.java:59)
at com.rapidminer.operator.features.transformation.DimensionalityReducer.apply(DimensionalityReducer.java:66)
at com.rapidminer.operator.Operator.apply(Operator.java:656)
...
Caused by: java.lang.ClassNotFoundException: Jama.Matrix
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)
... 5 more

=====================================================================================

This occurs when i integrate my program with the code below:

...
Operator SVD = OperatorService.createOperator("SVDReduction");

IOContainer container = wvtoolOperator.apply(new IOContainer());
container = SVD.apply(container); //ERROR OCCURS HERE
ExampleSet exampleSet = container.get(ExampleSet.class);
...

=======================================================================

When i replace "SOMDimensionalityReduction" with "SVDReduction" it works fine. May i know what are the possible causes?

詹姆斯,
regards

IngoRM

Hi,

the SVDReduction needs another library in your project named "Jama.jar" (from the lib directory of RapidMiner). Just add this library to your project together with the rapidminer.jar and the SVDReduction should work.

Cheers,
Ingo

Legacy User

Thank you for your quick reponse. Really appreciate the effort.


regards