I apologize, this seems like it is really simple but I can't seem to get it.
I've downloaded the Windows version of WEKA and installed it, but I can't seem to call it from the command line.
I've added a WEKAHOME environment variable, pointing to the directory containing weka.jar, and added that to my path with /weka.jar appended to it..
I am trying this command: java weka.classifiers.j48.J48 -t %WEKAHOME%/data/iris.arff
I then get the following error output.
Exception in thread "main" java.lang.NoClassDefFoundError:
weka/classifiers/j48/ J48 Caused by: java.lang.ClassNotFoundException:
weka.classifiers.j48.J48
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) Could not find the main class: weka.classifiers.j48.J48. Program will exit.
What can I do to fix this?
It's because of this weka.classifiers.j48.J48, that is an error in the Weka documentation, it should be: weka.classifiers.trees.J48
(Note: the comments below are no longer relevant. The answer here works, and remember to set the classpath as Thomas Jungblut says below.)
Related
I found the Stanford pos tagger and would like to use it in a project I am working on.
Unfortunately, I get the following error when I try to run it:
Exception in thread "Thread-0" java.lang.NoClassDefFoundError:
org/slf4j/LoggerFactory
at edu.stanford.nlp.io.IOUtils.(IOUtils.java:41)
at edu.stanford.nlp.tagger.maxent.MaxentTagger.readModelAndInit(MaxentTagger.java:765)
at edu.stanford.nlp.tagger.maxent.MaxentTagger.(MaxentTagger.java:298)
at edu.stanford.nlp.tagger.maxent.MaxentTagger.(MaxentTagger.java:263)
at edu.stanford.nlp.tagger.maxent.MaxentTaggerGUI$1.run(MaxentTaggerGUI.java:89)
Caused by: java.lang.ClassNotFoundException: org.slf4j.LoggerFactory
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 5 more
The same error occurred whether running within eclipse, command line, or gui.
I discovered after searching for a solution and trying many that didn't help, that the previous version 3.5.2 runs just fine with no errors so I will revert to the previous version for now.
Is it possible there is a problem with the new version?
We've added slf4j logging to our releases. In 3.6.0 there is a folder called lib which needs to be added to the CLASSPATH.
My CORBA/Webstart application using an alternative ORB implementation (OpenORB) doesn't work with Java7u55 anymore.
The following exception occurs:
Error org.omg.CORBA.INITIALIZE: can't instantiate default ORB implementation org.openorb.CORBA.ORBSingleton vmcid: 0x0 minor code: 0 completed: No
org.omg.CORBA.INITIALIZE: can't instantiate default ORB implementation org.openorb.CORBA.ORBSingleton vmcid: 0x0 minor code: 0 completed: No
at org.omg.CORBA.ORB.create_impl_with_systemclassloader(Unknown Source)
at org.omg.CORBA.ORB.init(Unknown Source)
at org.openorb.CORBA.kernel.OpenORBLoader.init(Unknown Source)
at org.openorb.CORBA.ORB.set_parameters(Unknown Source)
at org.omg.CORBA.ORB.init(Unknown Source)
...
Caused by: java.lang.ClassNotFoundException: org.openorb.CORBA.ORBSingleton
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)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
... 17 more
I think a a change in orb.omg.CORBA.ORB.init() is the reason the class for the ORB implementation wasn't found anymore as SystemClassLoader is used here now to create the ORB instance instead of current Thread's ContextClassLoader as before.
As a workaround I've copied the Jar containing org.omg.CORBA API of the ORB implementation I'm using to <jre-home>/lib/endorsed/ expecting that it will be used instead but still the implementation in rt.jar is used.
Any ideas how to work around this problem?
Finally I found a workaround which doesn't work for the currently used OpenORB but for JacORB (3.4).
Oracle obviously updated the release notes suggesting to configure only the org.omg.CORBA.ORBClass property but to ommit org.omg.CORBA.ORBSingletonClass which means the default singleton implementation shipped with Java will be used which is visible for the SystemClassLoader.
This may not work with all ORBs and in fact it doesn't work with OpenORB as it checks org.omg.CORBA.ORBSingletonClass but my application works without problems with the mentioned version of JacORB now.
there should be several workarounds:
specify the following VM args when launching your app: -Djava.endorsed.dirs=/path/to/your/corba_library_jars_folder
specify the following VM args when launching your app:
-Xbootclasspath/p:/path/to/your/corba_lib.jar:/path/to/your/corba_lib2.jar:...
copy your jars into $JAVA_HOME/jre/lib/endorsed directory (create it if it doesn't exist)
I tried to run WLST (on Windows XP) but i always get java.lang.NoClassDefFoundError:
Exception in thread "main" java.lang.NoClassDefFoundError: weblogic/wlst
Caused by: java.lang.ClassNotFoundException: weblogic.wlst
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)
Could not find the main class: weblogic.wlst. Program will exit.
I tried to run *user_projects/domains/my_domain/bin/setDomainEnv.cmd* and *wlserver_10.3/server/bin/setWLSEnv.cmd* but without any success, i always get this NoClassDefFoundError when i run java weblogic.wlst myscript.py. What should i do?
To invoke WLST:
<WL_HOME>/common/bin/wlst.cmd myscript.py
Example:
C:/Oracle/Middleware/wlserver_10.3/common/bin/wlst.cmd myscript.py
The reason for your error is, weblogic.jar is not present in your CLASSPATH environment variable.
You don't need to do that every time you run the batch file.
From "My Computer" or "Computer" (depending on your version of Windows)
Click "Properties" or "System Properties"
Click "Advanced System Settings"
Add these user Environment Variables
WL_HOME=C:/Oracle/Middleware/wlserver_10.3
and
CLASSPATH=.;%WL_HOME%/server/lib/weblogic.jar
I want to run weka through the command line. I type in this command:
java -classpath weka.jar weka.classifiers.trees.J48 -t data/weather.arff -i
And I get this error
Exception in thread "main" java.lang.NoClassDefFoundError: weka/classifiers/tree
s/J48
Caused by: java.lang.ClassNotFoundException: weka.classifiers.trees.J48
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)
Could not find the main class: weka.classifiers.trees.J48. Program will exit.
My classpath variable is set to C:\Program Files\Weka-3-4\mysql-connector-java-3.1.8-bin.jar
Please let me know. Thanks.
Is your command shell in the same directory as weka.jar?
You get that message if java simply can't find weka.jar
go
dir weka.jar
and check that the command shell can find it.
If not, you need to cd to the folder that contains weka.jar
Or you could put the full path to weka.jar
$java -classpath /"your-weka-path"/weka.jar weka.classifiers.trees.J48 -t data/weather.arff -i
I compiled Infinispan quickstart and when I am trying to run I am getting following error
Exception in thread "main" java.lang.NoClassDefFoundError: Quickstart (wrong nam
e: org/infinispan/quickstart/embeddedcache/Quickstart)
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClassCond(Unknown Source)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.access$000(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)
Could not find the main class: Quickstart. Program will exit.
I am following this tutorial.
https://github.com/infinispan/infinispan-quickstart/tree/master/embedded-cache
Though I am not using any IDE so that I can learn how maven works with infinispan. From command prompt prompt I am using this command To compile,
mvn clean compile dependency:copy-dependencies -DstripVersion
and then, to run,
java -cp target/classes:target/dependency/* Quickstart
It is compiling successfully.
I have tried to compile and then run the quickstart from within target directory where the class file is kept. But I am getting the same error class found .....
Thanks
Meena
Anyhelp will be appreciated.
Try running with
java -cp target/classes:target/dependency/* org.infinispan.quickstart.embeddedcache.Quickstart