From: Ovidiu Ivanciuc <[hidden email]>
Reply-To: 'Weka machine learning workbench list.' <[hidden email]>
Date: Thursday, 13 June 2013 2:05 PM
To: 'Weka machine learning workbench list.' <[hidden email]>
Subject: [Wekalist] Weka > 3.7.3 is not starting in Windows 7

Hi,
Up to (and including) Weka 3.7.3 i can launch the program with:
'C:Program Files (x86)Javajre7binjava.exe' -Xmx512m -classpath '%CLASSPATH%;weka.jar' weka.gui.GUIChooser
On the same computer, newer versions of Weka will not start with this command, or with RunWeka.bat.
I am using Windows 7 64bit, with Java 7u21, 32 & 64 bit.
I tested with Weka from 3.7.4 to 3.7.9 (32 and64 bit) with no success.
Here is the output for Weka-3-7-9 32 bit:
C:SoftwareWekaWeka-3-7-9-32>'C:Program Files (x86)Javajre7binjava.exe' -
Xmx512m -classpath ';weka.jar' weka.gui.GUIChooser 1
[Weka] massiveOnlineAnalysis can't be loaded because C:UsersOvidiuwekafilesp
ackagesmassiveOnlineAnalysislibmoa.jar appears to be missing.
[Weka] massiveOnlineAnalysis can't be loaded because the moa.jar file seems to b
e missing. Download MOA from http://www.cs.waikato.ac.nz/~abifet/MOA/ and copy t
he moa.jar file to $HOME/wekafiles/packages/massiveOnlineAnalysis/lib
Refreshing GOE props...
---Registering Weka Editors---
Exception in thread 'main' java.lang.NoClassDefFoundError: weka/classifiers/tree
s/j48/C45PruneableClassifierTreeG
java.lang.Class.forName0(Native Method)
java.lang.Class.forName(Unknown Source)
weka.core.ClassDiscovery.find(ClassDiscovery.java:343)
weka.gui.GenericPropertiesCreator.generateOutputProperties(GenericProper
tiesCreator.java:514)
weka.gui.GenericPropertiesCreator.execute(GenericPropertiesCreator.java:
606)
weka.gui.GenericPropertiesCreator.execute(GenericPropertiesCreator.java:
582)
weka.core.converters.ConverterUtils.initialize(ConverterUtils.java:730)
weka.core.converters.ConverterUtils.<clinit>(ConverterUtils.java:711)
java.lang.Class.forName0(Native Method)
java.lang.Class.forName(Unknown Source)
weka.core.ClassDiscovery.find(ClassDiscovery.java:343)
weka.gui.GenericPropertiesCreator.generateOutputProperties(GenericProper
tiesCreator.java:514)
weka.gui.GenericPropertiesCreator.execute(GenericPropertiesCreator.java:
606)
weka.gui.GenericPropertiesCreator.<clinit>(GenericPropertiesCreator.java
:149)
weka.core.WekaPackageManager.refreshGOEProperties(WekaPackageManager.jav
a:880)
weka.core.WekaPackageManager.loadPackages(WekaPackageManager.java:874)
weka.core.WekaPackageManager.loadPackages(WekaPackageManager.java:813)
weka.gui.GenericObjectEditor.determineClasses(GenericObjectEditor.java:1
74)
weka.gui.GenericObjectEditor.<clinit>(GenericObjectEditor.java:248)
weka.gui.GUIChooser.<init>(GUIChooser.java:707)
weka.gui.GUIChooser.createSingleton(GUIChooser.java:259)
weka.gui.GUIChooser.main(GUIChooser.java:1558)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at weka.core.ClassDiscovery.find(ClassDiscovery.java:343)
at weka.gui.GenericPropertiesCreator.generateOutputProperties(GenericPro
pertiesCreator.java:514)
at weka.gui.GenericPropertiesCreator.execute(GenericPropertiesCreator.ja
va:606)
at weka.gui.GenericPropertiesCreator.execute(GenericPropertiesCreator.ja
va:582)
at weka.core.converters.ConverterUtils.initialize(ConverterUtils.java:73
0)
at weka.core.converters.ConverterUtils.<clinit>(ConverterUtils.java:711)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at weka.core.ClassDiscovery.find(ClassDiscovery.java:343)
at weka.gui.GenericPropertiesCreator.generateOutputProperties(GenericPro
pertiesCreator.java:514)
at weka.gui.GenericPropertiesCreator.execute(GenericPropertiesCreator.ja
va:606)
at weka.gui.GenericPropertiesCreator.<clinit>(GenericPropertiesCreator.j
ava:149)
at weka.core.WekaPackageManager.refreshGOEProperties(WekaPackageManager.
java:880)
at weka.core.WekaPackageManager.loadPackages(WekaPackageManager.java:874
)
at weka.core.WekaPackageManager.loadPackages(WekaPackageManager.java:813
)
at weka.gui.GenericObjectEditor.determineClasses(GenericObjectEditor.jav
a:174)
at weka.gui.GenericObjectEditor.<clinit>(GenericObjectEditor.java:248)
at weka.gui.GUIChooser.<init>(GUIChooser.java:707)
at weka.gui.GUIChooser.createSingleton(GUIChooser.java:259)
at weka.gui.GUIChooser.main(GUIChooser.java:1558)
Caused by: java.lang.ClassNotFoundException: weka.classifiers.trees.j48.C45Prune
ableClassifierTreeG
at java.net.URLClassLoader$1.run(Unknown Source)
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)
... 22 more

Do you have an old version of the J48graft package installed? There were a couple of classes related to this method that didn't get moved from core Weka to the package when schemes were originally split out into packages. This got rectified a while ago and the package updated. Try deleting and then re-installing the J48graft package. Note that Windows seems locks files that are in the CLASSPATH which makes it impossible for Weka's package manager to completely uninstall a package – it is best to delete the package folders manually from ${user.home}/wekafiles/packages under Windows.

Cheers,