Develop Reference

Running java file with jar and text file input

I am trying to run a program on the command line that uses the JavaMail API. This program also reads in a message from a text file. However, I'm getting this error:
Error: A JNI error has occurred, please check your installation and try again
Exception in thread "main" java.lang.NoClassDefFoundError: javax/mail/Address
at java.lang.Class.getDeclaredMethods0(Native Method)
at java.lang.Class.privateGetDeclaredMethods(Class.java:2701)
at java.lang.Class.privateGetMethodRecursive(Class.java:3048)
at java.lang.Class.getMethod0(Class.java:3018)
at java.lang.Class.getMethod(Class.java:1784)
at sun.launcher.LauncherHelper.validateMainClass(LauncherHelper.java:544)
at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:526)
Caused by: java.lang.ClassNotFoundException: javax.mail.Address
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 7 more
Originally I used java -cp /path/to/mail.jar mailTest < message.txt
I configured the classpath for the jar successfully (as far as I know). Can anyone give me some pointers? :/

Your classpath is definitely wrong. The classpath needs to include both the javax.mail.jar file and the classes for your application. Exactly where is the JavaMail jar file, exactly where are your application classes, and exactly what java command line did you use? If your application classes are in the current directory, you need something like
java -cp /path/to/javax.mail.jar:. mailTest

Actually if you look at the error message:
Caused by: java.lang.ClassNotFoundException: javax.mail.Address
That's probably because your jar depends on another jar (probably mail-x.y.z.jar) and you did not include it on your classpath when trying to run your jar.
Either include the missing jar(s) on the command line, see this post, or add them to your manifest file, see the doc

MongoDB with java Exception in thread "main" java.lang.NoClassDefFoundError: org/bson/conversions/Bson

When I execute mycode from intelliJ Idea it works fine but when I run the jar on my server it throws the below error. I am using 'org.mongodb:mongodb-driver:3.4.1' version.
Exception in thread "main" java.lang.NoClassDefFoundError: org/bson/conversions/Bson
at com.myapp.server.mongo.MongoDbHandler.prepareMongoDb(MongoDbHandler.java:68)
at com.myapp.server.mongo.MongoDbHandler.<init>(MongoDbHandler.java:22)
at com.myapp.server.Client.main(Client.java:167)
Caused by: java.lang.ClassNotFoundException: org.bson.conversions.Bson
at java.net.URLClassLoader$1.run(URLClassLoader.java:372)
at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:360)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 3 more

I know its an old thread and its just for those who have the similar issues. Few days back I was also facing the same issue with same error trace while running the jar by command line.After rechecking the code found that
It was not a problem of the jar version but its problem of the packaging of the
jar
After packing the jar with all proper dependencies will solve this issue.
I have used
maven-assembly-plugin
for packaging and its works.
.

If I had to guess you need to get yourself whatever BSON library you're using; I wouldn't say that Mongo is your problem.
key line here is:
"Caused by: java.lang.ClassNotFoundException: org.bson.conversions.Bson"
So it's saying that it's not finding that particular class, I would look in IntelliJ and see what BSON library it is, then put it in your build directory (or java lib) on your server.

Java communication with JavaDB classNotFoundException

I'm trying to make a Java program that can communicate with JavaDB. I've made the Database class, started a server and made a tiny client program to check if they would communicate.
The program crashes when i try to run it, giving a class not found exception at the line where i try to set the database driver. I googled it and found that this error appears if derbyclient.jar and derby.jar are not found in the classpath. I also read that the scripts setNetworkClientCP and setNetworkServerCP found in the db directory would set these in the classpath. I found the scripts, ran them, and checked to make sure the classpath got updated, but i still get the same error. Does anyone know what the problem might be?
EDIT: SOLVED - i just realized that i need to include the derbyclient.jar in the NetBeans project library.

I'm using NetBeans and the built in JavaDB. I set the classpath by using the scripts that i mentioned above, and upon checking the classpath i found these entries:
%DERBY_INSTALL%\lib\derbyclient.jar;
%DERBY_INSTALL%\lib\derby.jar;
%DERBY_INSTALL%\lib\derbytools.jar;
%DERBY_INSTALL%\lib\derbynet.jar;
The Error:
java.lang.ClassNotFoundException: org.apache.derby.jdbc.ClientDriver
at java.net.URLClassLoader$1.run(URLClassLoader.java:372)
at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:360)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:260)
at Database.<init>(Database.java:14)
at TestKlient.main(TestKlient.java:8)

Exception in thread "main" java.lang.NoClassDefFoundError in Java3D

I'm trying to develop a java3d application, i try everything, i just download the jogamp-platform because how i could read in many websites the java3d is obsolete and for mac os x you need this, i put them all in /System/Frameworks/Java/Extensions where are my .jar files in order to not add to the classpath in Eclipse but it still getting the same error:
Exception in thread "main" java.lang.NoClassDefFoundError: javax/media/opengl/AbstractGraphicsDevice
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:171)
at javax.media.j3d.Pipeline$1.run(Pipeline.java:143)
at java.security.AccessController.doPrivileged(Native Method)
at javax.media.j3d.Pipeline.createPipeline(Pipeline.java:138)
at javax.media.j3d.MasterControl.loadLibraries(MasterControl.java:926)
at javax.media.j3d.VirtualUniverse.<clinit>(VirtualUniverse.java:280)
at javax.media.j3d.Canvas3D.<clinit>(Canvas3D.java:3862)
at Apartado_a.<init>(Apartado_a.java:17)
at Apartado_a.main(Apartado_a.java:67)
Caused by: java.lang.ClassNotFoundException: javax.media.opengl.AbstractGraphicsDevice
at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at sun.misc.Launcher$ExtClassLoader.findClass(Launcher.java:229)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
... 10 more
These are the files inside extensions folder:
j3daudio.jar
j3dcore.jar
j3dutils.jar
joal-natives-macosx-universal.jar
jogl-all.jar
gluegen-rt.jar
gluegen-rt-natives-macosx-universal.jar
Regards!

Mac OS X comes pre-installed with Java 3D version 1.3. You can find these files in /System/Library/Java/Extensions. If you need to install Java 3D version 1.5 (and it sounds like you do), then you can use this installer: http://create.ife.no/vr/tools/j3d/java3d_1_5_2-macosx.pkg.zip

Don't use the /System/Frameworks/Java/Extensions folder for this.
Instead, include the relevant libraries in the lib/ folder of your application. Also, check which version of the JDK you are using. I believe there are some issues with Java3D running on the newer Apple-provided JVMs versus the older Oracle/Sun provided ones.

running python using jython

I want to run a python function using jython..
Taking the example from this site.
http://sundaycomputing.blogspot.com/2011/01/python-udfs-from-pig-scripts.html
Now when i run the script (pig -f myscript.pig
It returns me this error
Pig Stack Trace
---------------
ERROR 2998: Unhandled internal error. org/python/core/PyException
java.lang.NoClassDefFoundError: org/python/core/PyException
at org.apache.pig.scripting.jython.JythonScriptEngine.registerFunctions(JythonScriptEngine.java:127)
at org.apache.pig.PigServer.registerCode(PigServer.java:567)
at org.apache.pig.tools.grunt.GruntParser.processRegister(GruntParser.java:421)
at org.apache.pig.tools.pigscript.parser.PigScriptParser.parse(PigScriptParser.java:419)
at org.apache.pig.tools.grunt.GruntParser.parseStopOnError(GruntParser.java:188)
at org.apache.pig.tools.grunt.GruntParser.parseStopOnError(GruntParser.java:164)
at org.apache.pig.tools.grunt.Grunt.exec(Grunt.java:81)
at org.apache.pig.Main.run(Main.java:427)
at org.apache.pig.Main.main(Main.java:108)
Caused by: java.lang.ClassNotFoundException: org.python.core.PyException
at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
... 9 more
================================================================================
I am guessing its because of the first line.. REGISTER udf.py USING jython AS udf;
and that I have to specify jython path? (since i am running this code on cluster.. i dont think i have set this thing up)..
Now... since i dont know much of java.. hence switched on python ... but how do i make this code run??
What sort of setup i have to do on my env... to debug this problem.
Thanks

Add $PIG_HOME/lib/jython.jar to your PIG_CLASSPATH environment variable.