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Lucene/Solr Maven build instructions
====================================
Contents:
A. How to use nightly Jenkins-built Lucene/Solr Maven artifacts
B. How to generate Maven artifacts
C. How to deploy Maven artifacts to a repository
D. How to use Maven to build Lucene/Solr
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A. How to use nightly Jenkins-built Lucene/Solr Maven artifacts
The most recently produced nightly Jenkins-built Lucene and Solr Maven
snapshot artifacts are available in the Apache Snapshot repository here:
https://repository.apache.org/snapshots
An example POM snippet:
<project ...>
...
<repositories>
...
<repository>
<id>apache.snapshots</id>
<name>Apache Snapshot Repository</name>
<url>https://repository.apache.org/snapshots</url>
<releases>
<enabled>false</enabled>
</releases>
</repository>
B. How to generate Lucene/Solr Maven artifacts
Prerequisites: OpenJDK 11+ and Ant 1.8.2+
Run 'ant generate-maven-artifacts' to create an internal Maven
repository, including POMs, binary .jars, source .jars, and javadoc
.jars.
You can run the above command in three possible places: the top-level
directory; under lucene/; or under solr/. From the top-level directory
or from lucene/, the internal repository will be located at dist/maven/.
From solr/, the internal repository will be located at package/maven/.
C. How to deploy Maven artifacts to a repository
Prerequisites: OpenJDK 11+ and Ant 1.8.2+
You can deploy targets for all of Lucene/Solr, only Lucene, or only Solr,
as in B. above. To deploy to a Maven repository, the command is the same
as in B. above, with the addition of two system properties:
ant -Dm2.repository.id=my-repo-id \
-Dm2.repository.url=https://example.org/my/repo \
generate-maven-artifacts
The repository ID given in the above command corresponds to a <server>
entry in either your ~/.m2/settings.xml or ~/.ant/settings.xml. See
<https://maven.apache.org/settings.html#Servers> for more information.
(Note that as of version 2.1.3, Maven Ant Tasks cannot handle encrypted
passwords.)
D. How to use Maven to build Lucene/Solr
In summary, to enable Maven builds, perform the following:
ant get-maven-poms
cd maven-build
The details, followed by some example Maven commands:
1. Prerequisites: OpenJDK 11+ and Maven 2.2.1 or 3.X
2. Make sure your sources are up to date.
3. Copy the Maven POM templates from under dev-tools/maven/ to the
maven-build/ directory using the following command from the top-level
directory:
ant get-maven-poms
Note that you will need to do this whenever changes to the POM
templates are committed. For this reason, it's a good idea run
"ant get-maven-poms" after you update from origin.
The above command copies all of the POM templates from dev-tools/maven/,
filling in the project version with the default "X.X-SNAPSHOT". If you
want the POMs and the Maven-built artifacts to have a version other than
the default, you can supply an alternate version on the command line
with the above command, e.g. "my-special-version":
ant -Dversion=my-special-version get-maven-poms
or to append "my-special-version" to the current base version, e.g. 5.0,
resulting in version "5.0-my-special-version":
ant -Ddev.version.suffix=my-special-version get-maven-poms
Note: if you change the version in the POMs, there is one test method
that will fail under maven-surefire-plugin:
o.a.l.index.TestCheckIndex#testLuceneConstantVersion(). It's safe to
@Ignore this test method, since it's just comparing the value of the
lucene.version system property (set in the maven-surefire-plugin
configuration in the lucene-core POM) against a hard-wired official
version (o.a.l.util.Constants.LUCENE_MAIN_VERSION).
4. To remove the maven-build/ directory and its contents, use the following
command from the top-level directory:
ant clean-maven-build
5. Please keep in mind that this is just a minimal Maven build. The resulting
artifacts are not the same as those created by the native Ant-based build.
It should be fine to enable Lucene builds in several Maven-based IDEs,
but should never be used for Lucene/Solr production usage, as they may lack
optimized class files (e.g., Java 9 MR-JAR support). To install Lucene/Solr
in your local repository, see instructions above.
Some example Maven commands you can use after you perform the above
preparatory steps:
- Compile, package, and install all binary artifacts to your local
repository:
mvn install
After compiling and packaging, but before installing each module's
artifact, the above command will also run all the module's tests.
The resulting artifacts are not the same as those created by the native
Ant-based build. They should never be used for Lucene/Solr production
usage, as they may lack optimized class files (e.g., Java 9 MR-JAR
support).
- Compile, package, and install all binary artifacts to your local
repository, without running any tests:
mvn -DskipTests install
- Compile, package, and install all binary and source artifacts to your
local repository, without running any tests:
mvn -DskipTests source:jar-no-fork install
- Run all tests:
mvn test
- Run all test methods defined in a test class:
mvn -Dtest=TestClassName test
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