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# Apache Lucene and Solr

Apache Lucene is a high-performance, full featured text search engine library
written in Java.

Apache Solr is an enterprise search platform written using Apache Lucene.
Major features include full-text search, index replication and sharding, and
result faceting and highlighting.


[![Build Status](https://builds.apache.org/view/L/view/Lucene/job/Lucene-Artifacts-master/badge/icon?subject=Lucene)](https://builds.apache.org/view/L/view/Lucene/job/Lucene-Artifacts-master/) [![Build Status](https://builds.apache.org/view/L/view/Lucene/job/Solr-Artifacts-master/badge/icon?subject=Solr)](https://builds.apache.org/view/L/view/Lucene/job/Solr-Artifacts-master/)


## Online Documentation

This README file only contains basic setup instructions.  For more
comprehensive documentation, visit:

- Lucene: <http://lucene.apache.org/core/documentation.html>
- Solr: <http://lucene.apache.org/solr/guide/>

## Building Lucene/Solr

(You do not need to do this if you downloaded a pre-built package)

### Building with Ant

Lucene and Solr are built using [Apache Ant](http://ant.apache.org/).  To build
Lucene and Solr, run:

`ant compile`

If you see an error about Ivy missing while invoking Ant (e.g., `.ant/lib does
not exist`), run `ant ivy-bootstrap` and retry.

Sometimes you may face issues with Ivy (e.g., an incompletely downloaded artifact).
Cleaning up the Ivy cache and retrying is a workaround for most of such issues: 

`rm -rf ~/.ivy2/cache`

The Solr server can then be packaged and prepared for startup by running the
following command from the `solr/` directory:

`ant server`

### Building with Gradle

There is ongoing work (see [LUCENE-9077](https://issues.apache.org/jira/browse/LUCENE-9077))
to switch the legacy ant-based build system to [gradle](https://gradle.org/).
Please give it a try!

At the moment of writing, the gradle build requires precisely Java 11 
(it may or may not work with newer Java versions).

To build Lucene and Solr, run (`./` can be omitted on Windows):

`./gradlew assemble`

The command above also packages a full distribution of Solr server; the 
package can be located at:

`solr/packaging/build/solr-*`

Note that the gradle build does not create or copy binaries throughout the
source repository (like ant build does) so you need to switch to the
packaging output folder above; the rest of the instructions below remain
identical.  

## Running Solr

After [building Solr](#building-lucene-solr), the server can be started using
the `bin/solr` control scripts.  Solr can be run in either standalone or
distributed (SolrCloud mode).

To run Solr in standalone mode, run the following command from the `solr/`
directory:

`bin/solr start`

To run Solr in SolrCloud mode, run the following command from the `solr/`
directory:

`bin/solr start -c`

The `bin/solr` control script allows heavy modification of the started Solr.
Common options are described in some detail in solr/README.txt.  For an
exhaustive treatment of options, run `bin/solr start -h` from the `solr/`
directory.

## Development/IDEs

Ant can be used to generate project files compatible with most common IDEs.
Run the ant command corresponding to your IDE of choice before attempting to
import Lucene/Solr.

- *Eclipse* - `ant eclipse` (See [this](https://cwiki.apache.org/confluence/display/solr/HowToConfigureEclipse) for details)
- *IntelliJ* - `ant idea` (See [this](https://cwiki.apache.org/confluence/display/lucene/HowtoConfigureIntelliJ) for details)
- *Netbeans* - `ant netbeans` (See [this](https://cwiki.apache.org/confluence/display/lucene/HowtoConfigureNetbeans) for details)

### Gradle build and IDE support

- *IntelliJ* - IntelliJ idea can import the project out of the box. 
               Code formatting conventions should be manually adjusted. 
- *Eclipse*  - Not tested.
- *Netbeans* - Not tested.

## Running Tests

The standard test suite can be run with the command:

`ant test`

Like Solr itself, the test-running can be customized or tailored in a number or
ways.  For an exhaustive discussion of the options available, run:

`ant test-help`

### Gradle build and tests

Run the following command to display an extensive help for running
tests with gradle:

`./gradlew helpTests`

## Contributing

Please review the [Contributing to Solr
Guide](https://cwiki.apache.org/confluence/display/solr/HowToContribute) for information on
contributing.

## Discussion and Support

- [Users Mailing List](http://lucene.apache.org/solr/community.html#solr-user-list-solr-userluceneapacheorg)
- [Developers Mailing List](http://lucene.apache.org/solr/community.html#developer-list-devluceneapacheorg)
- [Lucene Issue Tracker](https://issues.apache.org/jira/browse/LUCENE)
- [Solr Issue Tracker](https://issues.apache.org/jira/browse/SOLR)
- IRC: `#solr` and `#solr-dev` on freenode.net