Mailing List Archive: run Lucene demo : fundamental question

run Lucene demo : fundamental question

Jun 22, 2007, 8:49 AM

Post #1 of 3 (2167 views)

1)I have downloaded and unpacked the Lucene tar.gz file

2)the successfully unpacked and installed files reside in a directory:
/usr/local/bin/Lucene/

3)echo $CLASSPATH returns: .:/usr/local/bin/Lucene/
. . . which is the directory in which reside the two .jar files, core
& demos, as well as the src directory;

4)from within my Lucene directory, I issue the following command (as
indicated in instructions at
lucene.apache.org/java/docs/demo.html):
java org.apache.lucene.demo.IndexFiles /usr/local/bin/Lucene/src

5)I receive the following error message:
Exception in thread "main" java.lang.NoClassDefFoundError:
org/apache/lucene/demo/IndexFiles

6)if I change my permission level to su and then issue the same
command, I receive the following error message:
Exception in thread "main" java.lang.NoClassDefFoundError:
org.apache.lucene.demo.IndexFiles
at gnu.java.lang.MainThread.run(libgcj.so.70)
Caused by: java.lang.ClassNotFoundException:
org.apache.lucene.demo.IndexFiles not found in
gnu.gcj.runtime.SystemClassLoader{urls=[file:./,file:/usr/local/bin/Lucene/],
parent=gnu.gcj.runtime.ExtensionClassLoader{urls=[], parent=null}}
at java.net.URLClassLoader.findClass(libgcj.so.70)
at gnu.gcj.runtime.SystemClassLoader.findClass(libgcj.so.70)
at java.lang.ClassLoader.loadClass(libgcj.so.70)
at java.lang.ClassLoader.loadClass(libgcj.so.70)
at gnu.java.lang.MainThread.run(libgcj.so.70)

Any suggestions? Clearly I am a novice in matters Javan . . . but
learning rapidly . . . I feel certain that this
can be resolved with a small "path" change of some sort . . . but
Zeus be damned if I know what it is.

Java program in general appears to be properly installed. Recently
downloaded from the Sun site.
I am able to compile and run other *.java files from my tutorial
directory. . . .

Thanks in advance for any help that might be forthcoming. I've
stepped through the directions several times . . . to no avail.
I have looked at the FAQ and browsed the list archives, but find
nothing so fundamental.

Cordially,

R. Mullin

Re: run Lucene demo : fundamental question [ In reply to ]

gsingers at apache

Jun 22, 2007, 9:00 AM

Post #2 of 3 (2049 views)

Permalink

Hi Robert,

For Lucene Java issues, try java-user@lucene.a.o, you will get much
better help in the future.

The issue appears to be that you need to include the actual JAR files
in the classpath, the directory containing them is not sufficient.
See http://www.gossamer-threads.com/lists/lucene/java-user/50132?
search_string=ERROR%20opening%20the%20Index;#50132 for a similar
discussion (which also can be applied to Lucene 2.2.0)

Cheers,
Grant

On Jun 22, 2007, at 11:49 AM, Robert Mullin wrote:

> 1)I have downloaded and unpacked the Lucene tar.gz file
>
> 2)the successfully unpacked and installed files reside in a directory:
> /usr/local/bin/Lucene/
>
> 3)echo $CLASSPATH returns: .:/usr/local/bin/Lucene/
> . . . which is the directory in which reside the two .jar files, core
> & demos, as well as the src directory;
>
> 4)from within my Lucene directory, I issue the following command (as
> indicated in instructions at
> lucene.apache.org/java/docs/demo.html):
> java org.apache.lucene.demo.IndexFiles /usr/local/bin/Lucene/src
>
> 5)I receive the following error message:
> Exception in thread "main" java.lang.NoClassDefFoundError:
> org/apache/lucene/demo/IndexFiles
>
> 6)if I change my permission level to su and then issue the same
> command, I receive the following error message:
> Exception in thread "main" java.lang.NoClassDefFoundError:
> org.apache.lucene.demo.IndexFiles
> at gnu.java.lang.MainThread.run(libgcj.so.70)
> Caused by: java.lang.ClassNotFoundException:
> org.apache.lucene.demo.IndexFiles not found in
> gnu.gcj.runtime.SystemClassLoader{urls=[file:./,file:/usr/local/bin/
> Lucene/],
> parent=gnu.gcj.runtime.ExtensionClassLoader{urls=[], parent=null}}
> at java.net.URLClassLoader.findClass(libgcj.so.70)
> at gnu.gcj.runtime.SystemClassLoader.findClass(libgcj.so.70)
> at java.lang.ClassLoader.loadClass(libgcj.so.70)
> at java.lang.ClassLoader.loadClass(libgcj.so.70)
> at gnu.java.lang.MainThread.run(libgcj.so.70)
>
> Any suggestions? Clearly I am a novice in matters Javan . . . but
> learning rapidly . . . I feel certain that this
> can be resolved with a small "path" change of some sort . . . but
> Zeus be damned if I know what it is.
>
> Java program in general appears to be properly installed. Recently
> downloaded from the Sun site.
> I am able to compile and run other *.java files from my tutorial
> directory. . . .
>
> Thanks in advance for any help that might be forthcoming. I've
> stepped through the directions several times . . . to no avail.
> I have looked at the FAQ and browsed the list archives, but find
> nothing so fundamental.
>
> Cordially,
>
> R. Mullin

--------------------------
Grant Ingersoll
Center for Natural Language Processing
http://www.cnlp.org/tech/lucene.asp

Read the Lucene Java FAQ at http://wiki.apache.org/lucene-java/LuceneFAQ

Re: run Lucene demo : fundamental question [ In reply to ]

amalafrida at gmail

Jun 22, 2007, 11:18 AM

Post #3 of 3 (2041 views)

Permalink

Grant,

Excellent! changed the CLASSPATH
then . . .
read the postings at the 'gossamer-threads' site you mentioned . . .
followed your directions and was able to successfully index and search 3000
pages of Edward Gibbon's <Decline and Fall of the Roman Empire> . . . I'm
preparing a CD edition for use at Harvard . . . and by anyone else who'll
purchase it for class work.

In any case, I thank you for your succinct and accurate advice. After some
further refinement, i.e. . . . getting this linked up with my HTML pages . .
. I'll come back and make a few suggestions for Apache instruction page . .
. it seems to me there are a few items that could be added for the newcomer
. . . e.g. an example CLASSPATH setting . . . also . . . your mention that
one could substitute any directory for the search . . . was a revelation . .
. I had not realized what that portion of the command was addressing . . .
and why . . . now it's clear.

Once again, thanks and I'll try to return the favor . . . as a technical
editor, perhaps I can be of some further assistance.

Cordially,

R. Mullin

On 6/22/07, Grant Ingersoll <gsingers@apache.org> wrote:
>
> Hi Robert,
>
> For Lucene Java issues, try java-user@lucene.a.o, you will get much
> better help in the future.
>
> The issue appears to be that you need to include the actual JAR files
> in the classpath, the directory containing them is not sufficient.
> See http://www.gossamer-threads.com/lists/lucene/java-user/50132?
> search_string=ERROR%20opening%20the%20Index;#50132 for a similar
> discussion (which also can be applied to Lucene 2.2.0)
>
> Cheers,
> Grant
>
> On Jun 22, 2007, at 11:49 AM, Robert Mullin wrote:
>
> > 1)I have downloaded and unpacked the Lucene tar.gz file
> >
> > 2)the successfully unpacked and installed files reside in a directory:
> > /usr/local/bin/Lucene/
> >
> > 3)echo $CLASSPATH returns: .:/usr/local/bin/Lucene/
> > . . . which is the directory in which reside the two .jar files, core
> > & demos, as well as the src directory;
> >
> > 4)from within my Lucene directory, I issue the following command (as
> > indicated in instructions at
> > lucene.apache.org/java/docs/demo.html):
> > java org.apache.lucene.demo.IndexFiles /usr/local/bin/Lucene/src
> >
> > 5)I receive the following error message:
> > Exception in thread "main" java.lang.NoClassDefFoundError:
> > org/apache/lucene/demo/IndexFiles
> >
> > 6)if I change my permission level to su and then issue the same
> > command, I receive the following error message:
> > Exception in thread "main" java.lang.NoClassDefFoundError:
> > org.apache.lucene.demo.IndexFiles
> > at gnu.java.lang.MainThread.run(libgcj.so.70)
> > Caused by: java.lang.ClassNotFoundException:
> > org.apache.lucene.demo.IndexFiles not found in
> > gnu.gcj.runtime.SystemClassLoader{urls=[file:./,file:/usr/local/bin/
> > Lucene/],
> > parent=gnu.gcj.runtime.ExtensionClassLoader{urls=[], parent=null}}
> > at java.net.URLClassLoader.findClass(libgcj.so.70)
> > at gnu.gcj.runtime.SystemClassLoader.findClass(libgcj.so.70)
> > at java.lang.ClassLoader.loadClass(libgcj.so.70)
> > at java.lang.ClassLoader.loadClass(libgcj.so.70)
> > at gnu.java.lang.MainThread.run(libgcj.so.70)
> >
> > Any suggestions? Clearly I am a novice in matters Javan . . . but
> > learning rapidly . . . I feel certain that this
> > can be resolved with a small "path" change of some sort . . . but
> > Zeus be damned if I know what it is.
> >
> > Java program in general appears to be properly installed. Recently
> > downloaded from the Sun site.
> > I am able to compile and run other *.java files from my tutorial
> > directory. . . .
> >
> > Thanks in advance for any help that might be forthcoming. I've
> > stepped through the directions several times . . . to no avail.
> > I have looked at the FAQ and browsed the list archives, but find
> > nothing so fundamental.
> >
> > Cordially,
> >
> > R. Mullin
>
> --------------------------
> Grant Ingersoll
> Center for Natural Language Processing
> http://www.cnlp.org/tech/lucene.asp
>
> Read the Lucene Java FAQ at http://wiki.apache.org/lucene-java/LuceneFAQ
>
>
>