keycloak/docs/building.md

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## Building from source
Ensure you have JDK 11 (or newer), Maven 3.5.4 (or newer) and Git installed
java -version
mvn -version
git --version
**NOTE**
If you use Maven 3.8.1 or newer, please add the following mirror to your local
`~/.m2/settings.xml` to avoid build errors:
```
<mirrors>
<mirror>
<id>jboss-public-repository-group-https</id>
<mirrorOf>jboss-public-repository-group</mirrorOf>
<name>Jboss public https</name>
<url>https://repository.jboss.org/nexus/content/groups/public/</url>
</mirror>
</mirrors>
```
See [KEYCLOAK-17812](https://issues.redhat.com/browse/KEYCLOAK-17812) for more details.
---
First clone the Keycloak repository:
git clone https://github.com/keycloak/keycloak.git
cd keycloak
To build Keycloak run:
mvn clean install
This will build all modules and run the testsuite.
To build the ZIP distribution run:
mvn clean install -Pdistribution
Once completed you will find distribution archives in `distribution`.
To build only the server run:
mvn -Pdistribution -pl distribution/server-dist -am -Dmaven.test.skip clean install
---
**NOTE**
Classes from `org.keycloak.testsuite.*` packages aren't suitable to be used in production.
---
### Building Quarkus Distribution
Please, take a look at this [documentation](../quarkus/README.md).
## Starting Keycloak
To start Keycloak during development first build as specified above, then run:
mvn -f testsuite/utils/pom.xml exec:java -Pkeycloak-server
When running testsuite, by default an account with username `admin` and password `admin` will be created within the master realm at start.
To start Keycloak from the server distribution first build the distribution it as specified above, then run:
tar xfz distribution/server-dist/target/keycloak-<VERSION>.tar.gz
cd keycloak-<VERSION>
bin/standalone.sh
To stop the server press `Ctrl + C`.
## Working with the codebase
We don't currently enforce a code style in Keycloak, but a good reference is the code style used by WildFly. This can be
retrieved from [Wildfly ide-configs](https://github.com/wildfly/wildfly-core/tree/main/ide-configs).To import formatting
rules, see following [instructions](http://community.jboss.org/wiki/ImportFormattingRules).
If your changes require updates to the database read [Updating Database Schema](updating-database-schema.md).
If your changes require introducing new dependencies or updating dependency versions please discuss this first on the
dev mailing list. We do not accept new dependencies to be added lightly, so try to use what is available.
### Building project from the IDE
Some parts of the project rely on generated code using Maven plugins. These steps might be skipped when building using
IDE resulting in compilation errors. To work around this make sure to build the project first using Maven. After the
initial build with Maven you should be able to build the project using the IDE as it will use the classes previously
generated by Maven plugins. Make sure you don't rebuild the whole project using the IDE as it would delete the generated
classes. E.g. in IntelliJ IDEA use `Build → Build Project` instead of `Build → Rebuild Project`.
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**NOTE**
If you are building the Operator from your IDE, make sure to build the project with the `operator` profile enabled in Maven
as it's excluded by default:
mvn clean install -Poperator -DskipTests
---