Question

I’m trying to check some SNMP example, so

• i’ve downloaded snmp4j.jar
• compiled SNMP.java using javac -cp snmp4j.jar SNMP.java (it’s OK)
• tried to start it using java -cp snmp4j.jar SNMP, but

it reports:

root@comp:~/workspace_c/SNMP# java -cp snmp4j.jar SNMP
Exception in thread "main" java.lang.NoClassDefFoundError: SNMP
Caused by: java.lang.ClassNotFoundException: SNMP
    at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
Could not find the main class: SNMP.  Program will exit.

UPDATE:
And when I import snmp4j.jar to the java project, it works normally in ECLIPSE…

UPDATE@2: main part of SNMP.java

import org.snmp4j.CommunityTarget;
...
public class SNMP {
  public static void main(String[] args) {
  ...
  }
}

what i’m doing wrong? it’s first time i’ve met snmp4j so i know noting about it

Answer 1

If I understand correctly, SNMP is your example class, which isn’t inside the jar. In that case, you need to add to the classpath both the jar and your current directory:

java -cp .:snmp4j.jar SNMP