问题1：
报错：java.lang.IllegalArgumentException:Comparison method violates its general contral!
方法：yes，Java 1.7 is a bitmore strict about custom sorts.put this additional parameter into your JAVA_OPTS:
-Djava.util.Arrays.useLegacyMergeSort=true
问题2：
报错：java.lang.IllegalArgumentException:A norminal attribute cannot have duplicate labels('(0.0000d-0.00005]').
方法：weka只能处理6位小数之内的，超过了的都当做0处理，改变相应特征的scale（放大倍数）是解决办法。
weka saves numbrs only with at most 6 digits after the decimal point.if the Discretize filter(which is used internally)produces bins with numbers that
are smaller than 10E-6 than this exception will be thrown.scaling that attribute as preprocessing step should help.