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Editorial Team
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Asked: 2026-05-26T11:21:44+00:00

I downloaded the lucene jars and then added them to the CLASSPATH variable via

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I downloaded the lucene jars and then added them to the CLASSPATH variable via my .bash_profile, the paths to the jars display correctly in the terminal.

export CLASSPATH=/Users/dk/lucene-3.4.0/lucene-core-3.4.0.jar
export CLASSPATH=$CLASSPATH:/Users/dk/lucene-3.4.0/contrib/demo/lucene-demo-3.4.0.jar

echo $CLASSPATH
/Users/dk/lucene-3.4.0/lucene-core-3.4.0.jar:/Users/dk/lucene-3.4.0/contrib/demo/lucene-demo-3.4.0.jar

However, java still complains to me when I try to run the demo:

java 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:202)
    at java.security.AccessController.doPrivileged(Native Method)
......

I was able to follow this exact procedure to get the lucene demo working on an ubuntu machine, now I just want it to be able to run on my mac. It seems there are similar questions floating around stackoverflow but none of them seem to answer this question.

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1 Answer

  1. Editorial Team

    Are you sure you have your paths right? It works fine for me.

    .../lucene-3.4.0/tmp $ ls
lucene-core-3.4.0.jar   lucene-demo-3.4.0.jar
.../lucene-3.4.0/tmp $ export CLASSPATH=./lucene-core-3.4.0.jar:./lucene-demo-3.4.0.jar
.../lucene-3.4.0/tmp $ echo $CLASSPATH
./lucene-core-3.4.0.jar:./lucene-demo-3.4.0.jar
.../lucene-3.4.0/tmp $ java org.apache.lucene.demo.IndexFiles -docs .
Indexing to directory 'index'...
adding ./lucene-core-3.4.0.jar
adding ./lucene-demo-3.4.0.jar
1485 total milliseconds
.../lucene-3.4.0/tmp $
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