newbie looking for some help

[Glen Wilson]

Have an issue, new to Java.
I'm trying to run java on the command line to insert some information into the database.

/usr/local/java/bin/java -classpath com/app/datur/ Blind
Exception in thread "main" java.lang.NoClassDefFoundError: Blind

/usr/local/java/bin/java com.app.datur.Blind
Exception in thread "main" java.lang.NoClassDefFoundError: com/app/datur/Blind

What does this mean?

[Stan James]

This is a pain to get working some times.

1) Update your PATH so you don't have to specify the path to java.exe. I'm not sure if this is important, but might be if the JVM wants to use the path to find other parts of the JRE.

2) Point your classpath to the directory that contains the first part of your package name. In my case it's called "bin" and "com" is a subdirectory there.

3) Specify the full package & class name for your main class.

Here's how I start one of my programs. I use jars instead of a directory structure, but otherwise it's the same:

e:
cd \sswiki
set path=e:\sswiki\jre1.5.0\bin;%path%
set classpath=sswiki.jar;saxman.jar
java.exe com.saxman.sswiki.SSWiki

See if any of that helps
[ November 24, 2004: Message edited by: Stan James ]

[Junilu Lacar]

This means that Java can't find the class files with the information you gave it on the command line. Let's say your source files are somewhere in your home directory:

~/src
    /project1
        /com
           /app
              /datur
                 /Blind.java

To compile and run, the commands would be:

cd ~/src/project1
/usr/local/java/bin/javac com/app/datur/Blind.java
/usr/local/java/bin/java com.app.datur.Blind

Also, make sure you have the package declaration in Blind.java:

package com.app.datur;

[Mike Gershman]

/usr/local/java/bin/java -classpath com/app/datur/ Blind
Exception in thread "main" java.lang.NoClassDefFoundError: Blind

If you are using Windows, try using \ instead of /.

Please check that Blind.class is actually in directory "com\app\datur".
Also, do a "dir" in Windows or "ls -l" in LINUX/UNIX just before you issue the java command and make sure that you see directory "com".

[Glen Wilson]

I'm on Solaris.

The full path to the Blind file is: /opt/application/test1/webapps/debatur/WEB-INF/classes/com/app/datur/Blind.class

file

package com.app.datur;

import java.io.DataOutputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.sql.*;
import java.util.StringTokenizer;

import com.app.dat.ApplicationCon;

[Glen Wilson]

Think I got it.

[Glen Wilson]

Except now I get

Exception in thread "main" com.dread.layer.DataException: Can't find DB Driver make sure it is on your classpath
java.lang.ClassNotFoundException: com.mysql.jdbc.Driver
at com.dread.layer.ConnectionFactory.__beginFactory(ConnectionFactory.java:231)
at com.dread.layer.ConnectionFactory.loadFactory(ConnectionFactory.java:121)
at com.app.datur.Blind.main(Blind.java:5)

mysql driver is in /opt/application/test1/webapps/debatur/WEB-INF/lib
[ November 24, 2004: Message edited by: Glen Wilson ]

[Junilu Lacar]

you need to add the jar file that contains the mysql driver class to your classpath

[Layne Lund]

If you need help with setting your CLASSPATH, check out this page on our friendly FAQ. Scroll down about half way for the instructions on how to do this in Linux. It should be similar in Solaris since it is basically a variant of Unix.

HTH

Layne