setting class-path & Library Path in ubantu

**programmer_007** · 02-22-2010, 10:30 AM

how to set classpath of a jar and librarypath of .so file in Ubantu ?

i have a "abc.jar" file that i have to put into CLASSPATH.
AND a native library "xyz.so" that i have to put into library path ..

I was setting paths in project builds in Eclipse , but nothing worked out .
now i want to run program out of eclipse.so how to set all these paths..

**programmer_007** · 02-22-2010, 10:32 AM

When i execute Hi.java following happens. i am unable to use the "com.asprise.util.ocr"

Java Code:

sandeep@training-pc1:~$ javac Hi.java
Hi.java:7: package com.asprise.util.ocr does not exist
import com.asprise.util.ocr.OCR;
                           ^
Hi.java:25: cannot find symbol
symbol  : class OCR
location: class Hi
		  String s = new OCR().recognizeCharacters(image);

**programmer_007** · 02-22-2010, 11:38 AM

Anybody ?

nobody !!

**r035198x** · 02-22-2010, 11:43 AM

You set the classpath using the -cp flag for both the javac and java commands.
You set the library path using the -Djava.library.path flag to the java command.

Also read this thread:
http://www.java-forums.org/eclipse/2...-lib-file.html

**programmer_007** · 02-22-2010, 12:01 PM

Java Code:

 javac -classpath /home/sandeep/Downloads/Asprise/aspriseOCR.jar Hi.java

above worked for class path .. and creates the .class file , but when i run it , this happens

Java Code:

Exception in thread "main" java.lang.NoClassDefFoundError: com/asprise/util/ocr/OCR
	at Hi.main(Hi.java:25)
Caused by: java.lang.ClassNotFoundException: com.asprise.util.ocr.OCR
	at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
	at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
	... 1 more

something wrong with library path ,, i guess.

Also read this thread:
want to add Asprise jar file as well as its lib file

this thread is confusing

**r035198x** · 02-22-2010, 12:09 PM

There is nothing wrong with the library path.
Did you get the correct asprise.jar or are you still trying to use the one that you (incorrectly) created?

**programmer_007** · 02-22-2010, 12:14 PM

no m not using the one i made yesterday .. i have got aspriseOCR.jar already packaged , that i have downloaded .... when i tried these stuffs on windows .. it worked
but something wrong when m doing in linux ubantu

**r035198x** · 02-22-2010, 12:18 PM

Did you add the cp flag to the java command too like I said above?
Post your full run command.

**programmer_007** · 02-22-2010, 12:25 PM

Java Code:

sandeep@training-pc1:~$ javac -cp /home/sandeep/Downloads/Asprise/aspriseOCR.jar Hi.java
sandeep@training-pc1:~$ 
sandeep@training-pc1:~$ 
sandeep@training-pc1:~$ java -cp /home/sandeep/Downloads/Asprise/aspriseOCR.jar Hi.java
Exception in thread "main" java.lang.NoClassDefFoundError: Hi/java
Caused by: java.lang.ClassNotFoundException: Hi.java
	at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
	at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
Could not find the main class: Hi.java.  Program will exit.
sandeep@training-pc1:~$

**programmer_007** · 02-22-2010, 12:27 PM

can i extract the jar to get the class files and then put those class files in the local directory of my program, ie all the classes in the same directory, and then run it .. wht say ?

**r035198x** · 02-22-2010, 12:28 PM

You don't run .java files, you run .class files.
When running the .class files you simply give the name of the class without the .class extension. These are basics that you should have read about before you wrote your first java program.

**programmer_007** · 02-22-2010, 12:32 PM

yaah man ... i know these ...

Java Code:

sandeep@training-pc1:~$ java -cp /home/sandeep/Downloads/Asprise/aspriseOCR.jar Hi
Exception in thread "main" java.lang.NoClassDefFoundError: Hi
Caused by: java.lang.ClassNotFoundException: Hi
	at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
	at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
Could not find the main class: Hi.  Program will exit.
sandeep@training-pc1:~$ ^C
sandeep@training-pc1:~$

**programmer_007** · 02-22-2010, 12:34 PM

the instruction in READ ME file are :

♦ Put aspriseOCR.jar into your class path, and

and for libAspriseOCR.so file , <native library>
♦ Put the native library into the library path.

wht will the scholar do ?

**r035198x** · 02-22-2010, 12:41 PM

No you don't know these. That is why you are having problems.
You also can't read the responses I'm posting.

1.) You also need to have the folder containing the Hi.class file on the classpath as well.
2.) You still didn't specify the library path.

**programmer_007** · 02-22-2010, 01:02 PM

appreciate your time for the thread .. but problem is also unidentified by you ... it is somethng else. . coz i think i have tried all the flags and combinations.. but its still unsolved.

**programmer_007** · 02-22-2010, 01:04 PM

1.) You also need to have the folder containing the Hi.class file on the classpath as well.
2.) You still didn't specify the library path.

the folder containing Hi.class is the very folder that contains aspriseOCR.jar , so its already in the classpath,,

**r035198x** · 02-22-2010, 01:19 PM

No it's not. You need to add it (.) the current directory but I guess I'm wasting my time here because you think that I'm wrong even though I'm trying to give you free help.
Thank you for (indirectly) asking me not to reply to you.

**programmer_007** · 02-22-2010, 01:30 PM

Thank you for (indirectly) asking me not to reply to you

]
come on .. dude !!! its not like that ....i appreciate ur time and help !! but u know i m stuck from more than 2 day on these stuff . understand.... i dint meant that ..

its only becoz m done with today's work .... now no more till 2morro