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From Paul Rogers <paul.roge...@gmail.com>
Subject Fwd: Problem running demo's - java classes not found
Date Thu, 04 Mar 2010 18:22:21 GMT
Dear All

Further to my previous email I notice I made a mistake with the second
example.  When I entered the second command it actually read:

java -cp org.apache.lucene.demo.IndexFiles docs

This is what gave the strange error about the docs Class was.  If I issue
the correct command:

java org.apache.lucene.demo.IndexFiles docs

I get the  same error as the first example.  My apologies for the typo/mix
up.


Regards



Paul

---------- Forwarded message ----------
From: Paul Rogers <paul.rogers6@gmail.com>
Date: 4 March 2010 17:49
Subject: Problem running demo's - java classes not found
To: java-user@lucene.apache.org


Dear  All

Hope someone can help.  I'm trying to run the demo's that came with Lucene
(3.0.0).  I extracted the tar.gz to a directory /home/paul/bin/lucene-3.0.0
and changed into the directory.  The contents of the directory are as
follows:

total 2288
-rw-r--r--  1 paul paul    3759 2009-11-16 14:00 BUILD.txt
-rw-r--r--  1 paul paul    9931 2009-11-22 14:47 build.xml
-rw-r--r--  1 paul paul  183614 2009-11-22 14:03 CHANGES.txt
drwxr-xr-x 25 paul paul    4096 2010-02-13 20:00 contrib
drwxr-xr-x  7 paul paul    4096 2009-11-22 14:47 docs
-rw-r--r--  1 paul paul    1616 2009-11-17 20:09 JRE_VERSION_MIGRATION.txt
drwxr-xr-x  2 paul paul    4096 2010-02-13 20:00 lib
-rw-r--r--  1 paul paul   12637 2009-11-16 14:00 LICENSE.txt
-rw-r--r--  1 paul paul 1021623 2009-11-22 14:44 lucene-core-3.0.0.jar
-rw-r--r--  1 paul paul   57087 2009-11-22 14:47 lucene-demos-3.0.0.jar
-rw-r--r--  1 paul paul  995413 2009-11-22 14:47 luceneweb.war
-rw-r--r--  1 paul paul    1319 2009-11-16 14:00 NOTICE.txt
-rw-r--r--  1 paul paul    1157 2009-11-16 14:00 README.txt
drwxr-xr-x  4 paul paul    4096 2010-02-13 20:00 src

I then run the following command, with the following results:

java -cp /home/paul/bin/lucene-3.0.0/ org.apache.lucene.demo.IndexFiles docs

Exception in thread "main" java.lang.NoClassDefFoundError:
org/apache/lucene/demo/IndexFiles
Caused by: java.lang.ClassNotFoundException:
org.apache.lucene.demo.IndexFiles
    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: org.apache.lucene.demo.IndexFiles.  Program
will exit.

I also tried:


CLASSPATH=/home/paul/bin/lucene-3.0.0/

echo $CLASSPATH
/home/paul/bin/lucene-3.0.0/

java org.apache.lucene.demo.IndexFiles docs

This gives the following error:

Exception in thread "main" java.lang.NoClassDefFoundError: docs
Caused by: java.lang.ClassNotFoundException: docs
    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: docs.  Program will exit.

I've searched the mailing lists and the problem generally seems to be that
the class path is not set.  Is this the issue here.  If so what am I doing
wrong?  Why does the second example say the class docs is missing when this
is the directory to index?  Does this all mean the classpath is not set in
the first example but is in the second?

Alternatively any suggestions as to what the problem is?  If it's a java
problem and is in the wrong forum, my apologies.  If some one'll point me in
the right direction I'd be grateful.

Many thanks in advance.

Regards

Paul

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