On Dec 26, 2005, at 6:31 PM, Federico Carbonetti wrote:
I'm new in the ML and in the Lucene world in general... :)

ML?

I then tried to follow the instructions found at
http://lucene.apache.org/java/docs/demo.html
so I opened a command prompt and typed: "java
org.apache.lucene.demo.IndexFiles C:\Programmi\lucene-1.4.3\src" and I
got the error "xception in thread "main" ... NoClassDefFound
org/apache/lucene/demo/IndexFiles" which means that it didn't find the
class definition.... But where is my mistake?

Can anybody help me pleeeeeeeease?? :)

Federico,

I'm pasting below the relevant piece of the "Installing Lucene" appendix, I hope this helps. At first glance, the environment and steps you described seemed fine, so I'm not sure what is awry.

I hope the info below helps:

Running the command-line demo
The command-line Lucene demo consists of two command-line programs: one
that indexes a directory tree of files and another that provides a simple search interface. To run this demo, set your current working directory to the directory where the binary distribution was expanded. Next, run the IndexFiles program
like this:

java -cp lucene-1.4.2.jar;lucene-demos-1.4.2.jar org.apache.lucene.demo.IndexFiles docs
.
.
.
adding docs/queryparsersyntax.html
adding docs/resources.html
adding docs/systemproperties.html
adding docs/whoweare.html
9454 total milliseconds

This command indexes the entire docs directory tree (339 files in our case) into an index stored in the index subdirectory of the location where you executed
the command.

NOTE Literally every file in the docs directory tree is indexed, including .gif and .jpg files. None of the files are parsed; instead, each file is indexed
by streaming its bytes into StandardAnalyzer.

To search the index just created, execute SearchFiles in this manner:

  java -cp lucene-1.4.2.jar;lucene-demos-1.4.2.jar
                org.apache.lucene.demo.SearchFiles

Query: IndexSearcher AND QueryParser
Searching for: +indexsearcher +queryparser
10 total matching documents
0. docs/api/index-all.html
1. docs/api/allclasses-frame.html
2. docs/api/allclasses-noframe.html
3. docs/api/org/apache/lucene/search/class-use/Query.html
4. docs/api/overview-summary.html
5. docs/api/overview-tree.html
6. docs/demo2.html
7. docs/demo4.html
8. docs/api/org/apache/lucene/search/package-summary.html
9. docs/api/org/apache/lucene/search/package-tree.html

SearchFiles prompts interactively with Query:. QueryParser is used with Standard- Analyzer to create a Query. A maximum of 10 hits are shown at a time; if there are
more, you can page through them. Press Ctrl-C to exit the program.

        Erik


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