java - Errors when converting CSV to ARFF in Android using Weka -


i'm sing code , instructions found on weka site https://weka.wikispaces.com/converting+csv+to+arff
reason giving me errors. notice check make sure file exists , readable.


code csvloader.java
https://github.com/rjmarsan/weka-for-android/blob/925a77b566d6e55a775911fbf317234d11ec8024/src/weka/core/converters/csvloader.java


android code

                    string input = environment.getexternalstoragedirectory().getabsolutepath()+"/homework1/user_patterns.csv";                     string output = environment.getexternalstoragedirectory().getabsolutepath()+"/homework1/user_patterns.arff";                     instances data = null;                      try {                         file inputfile = new file(input);                         system.out.println(inputfile.exists());                         system.out.println(inputfile.canread());                          // load csv                         csvloader loader = new csvloader();                         loader.setsource(inputfile);                         data = loader.getdataset();                          // save arff                         arffsaver saver = new arffsaver();                         saver.setinstances(data);                         saver.setfile(new file(output));                         saver.writebatch();                     } catch (ioexception err) {                         system.out.println(err);                     }

stack trace

09-30 15:23:03.810  22869-22869/com.weka w/dalvikvm﹕ exception ljava/lang/nullpointerexception; thrown while initializing lweka/core/converters/converterutils; 09-30 15:23:03.810  22869-22869/com.weka w/dalvikvm﹕ threadid=1: thread exiting uncaught exception (group=0xa4d12b20) 09-30 15:23:03.814  22869-22869/com.weka e/androidruntime﹕ fatal exception: main     process: com.weka, pid: 22869     java.lang.exceptionininitializererror             @ weka.core.converters.csvloader.readheader(csvloader.java:882)             @ weka.core.converters.csvloader.readstructure(csvloader.java:534)             @ weka.core.converters.csvloader.getstructure(csvloader.java:519)             @ weka.core.converters.csvloader.getdataset(csvloader.java:552)             @ com.weka.mainmenu$1.onclick(mainmenu.java:105)             @ android.view.view.performclick(view.java:4438)             @ android.view.view$performclick.run(view.java:18422)             @ android.os.handler.handlecallback(handler.java:733)             @ android.os.handler.dispatchmessage(handler.java:95)             @ android.os.looper.loop(looper.java:136)             @ android.app.activitythread.main(activitythread.java:5001)             @ java.lang.reflect.method.invokenative(native method)             @ java.lang.reflect.method.invoke(method.java:515)             @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:785)             @ com.android.internal.os.zygoteinit.main(zygoteinit.java:601)             @ dalvik.system.nativestart.main(native method)      caused by: java.lang.nullpointerexception             @ weka.core.converters.converterutils.<clinit>(converterutils.java:741)             at weka.core.converters.csvloader.readheader(csvloader.java:882)             at weka.core.converters.csvloader.readstructure(csvloader.java:534)             at weka.core.converters.csvloader.getstructure(csvloader.java:519)             at weka.core.converters.csvloader.getdataset(csvloader.java:552)             at com.weka.mainmenu$1.onclick(mainmenu.java:105)             at android.view.view.performclick(view.java:4438)             at android.view.view$performclick.run(view.java:18422)             at android.os.handler.handlecallback(handler.java:733)             at android.os.handler.dispatchmessage(handler.java:95)             at android.os.looper.loop(looper.java:136)             at android.app.activitythread.main(activitythread.java:5001)             at java.lang.reflect.method.invokenative(native method)             at java.lang.reflect.method.invoke(method.java:515)             at com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:785)             at com.android.internal.os.zygoteinit.main(zygoteinit.java:601)             at dalvik.system.nativestart.main(native method)

note mainmenu.java:105 refers data = loader.getdataset();

try changing code 

// load csv     csvloader loader = new csvloader();     if(null != inputfile){         loader.setsource(inputfile);         data = loader.getdataset();     }else{         log.e("error","error input file null");     }

try , tell me if error in log cat , no crash


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