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# dokka [](https://confluence.jetbrains.com/display/ALL/JetBrains+on+GitHub) [/statusIcon)](https://teamcity.jetbrains.com/viewType.html?buildTypeId=Kotlin_Dokka_DokkaAntMavenGradle&branch_KotlinTools_Dokka=%3Cdefault%3E&tab=buildTypeStatusDiv)
Dokka is a documentation engine for Kotlin, performing the same function as javadoc for Java.
Just like Kotlin itself, Dokka fully supports mixed-language Java/Kotlin projects. It understands
standard Javadoc comments in Java files and [KDoc comments](https://kotlinlang.org/docs/reference/kotlin-doc.html) in Kotlin files,
and can generate documentation in multiple formats including standard Javadoc, HTML and Markdown.
## Using dokka
**Full documentation is available at [http://kotlin.github.io/dokka](http://kotlin.github.io/dokka)**
### Using the Gradle plugin
_Note: If you are upgrading from 0.10.x to a current release of dokka, please have a look at our
[migration guide](runners/gradle-plugin/MIGRATION.md)_
The preferred way is to use `plugins` block. Since dokka is currently not published to the Gradle plugin portal,
you not only need to add `dokka` to the `build.gradle.kts` file, but you also need to modify the `settings.gradle.kts` file:
build.gradle.kts:
```kotlin
plugins {
id("org.jetbrains.dokka") version "1.4.0-rc"
}
repositories {
jcenter() // or maven(url="https://dl.bintray.com/kotlin/dokka")
}
```
settings.gradle.kts:
```kotlin
pluginManagement {
repositories {
gradlePluginPortal()
jcenter()
}
}
```
The plugin adds `dokkaHtml`, `dokkaJavadoc`, `dokkaGfm` and `dokkaJekyll` tasks to the project.
#### Applying plugins
Dokka plugin creates Gradle configuration for each output format in the form of `dokka${format}Plugin`:
```kotlin
dependencies {
dokkaHtmlPlugin("org.jetbrains.dokka:kotlin-as-java-plugin:1.4.0-rc")
}
```
You can also create a custom dokka task and add plugins directly inside:
```kotlin
val customDokkaTask by creating(DokkaTask::class) {
dependencies {
plugins("org.jetbrains.dokka:kotlin-as-java-plugin:1.4.0-rc")
}
}
```
Please note that `dokkaJavadoc` task will properly document only single `jvm` source set
To generate the documentation, use the appropriate `dokka${format}` Gradle task:
```bash
./gradlew dokkaHtml
```
Please see the [Dokka Gradle example project](https://github.com/Kotlin/kotlin-examples/tree/master/gradle/dokka/dokka-gradle-example) for an example.
#### Android
Make sure you apply dokka after `com.android.library` and `kotlin-android`.
```kotlin
buildscript {
repositories {
jcenter()
}
dependencies {
classpath("org.jetbrains.kotlin:kotlin-gradle-plugin:${kotlin_version}")
classpath("org.jetbrains.dokka:dokka-gradle-plugin:${dokka_version}")
}
}
repositories {
jcenter()
}
apply(plugin= "com.android.library")
apply(plugin= "kotlin-android")
apply(plugin= "org.jetbrains.dokka")
```
```kotlin
dokkaHtml.configure {
dokkaSourceSets {
named("main") {
noAndroidSdkLink.set(false)
}
}
}
```
#### Multi-module projects
For documenting Gradle multi-module projects, you can use `dokka${format}Multimodule` tasks.
```kotlin
tasks.dokkaHtmlMultiModule.configure {
outputDirectory.set(buildDir.resolve("dokkaCustomMultiModuleOutput"))
documentationFileName.set("README.md")
}
```
`DokkaMultiModule` depends on all dokka tasks in the subprojects, runs them, and creates a toplevel page (based on the `documentationFile`)
with links to all generated (sub)documentations
### Using the Maven plugin
The Maven plugin does not support multi-platform projects.
The Maven plugin is available in JCenter. You need to add the JCenter repository to the list of plugin repositories if it's not there:
```xml
<pluginRepositories>
<pluginRepository>
<id>jcenter</id>
<name>JCenter</name>
<url>https://jcenter.bintray.com/</url>
</pluginRepository>
</pluginRepositories>
```
Documentation is by default generated in `target/dokka`.
The following goals are provided by the plugin:
* `dokka:dokka` - generate HTML documentation in Dokka format (showing declarations in Kotlin syntax)
* `dokka:javadoc` - generate HTML documentation in Javadoc format (showing declarations in Java syntax)
* `dokka:javadocJar` - generate a .jar file with Javadoc format documentation
#### Applying plugins
You can add plugins inside the `dokkaPlugins` block:
```xml
<plugin>
<groupId>org.jetbrains.dokka</groupId>
<artifactId>dokka-maven-plugin</artifactId>
<version>${dokka.version}</version>
<executions>
<execution>
<phase>pre-site</phase>
<goals>
<goal>dokka</goal>
</goals>
</execution>
</executions>
<configuration>
<dokkaPlugins>
<plugin>
<groupId>org.jetbrains.dokka</groupId>
<artifactId>kotlin-as-java-plugin</artifactId>
<version>${dokka.version}</version>
</plugin>
</dokkaPlugins>
</configuration>
</plugin>
```
Please see the [Dokka Maven example project](https://github.com/JetBrains/kotlin-examples/tree/master/maven/dokka-maven-example) for an example.
### Using the Command Line
To run Dokka from the command line, download the [Dokka CLI runner](https://github.com/Kotlin/dokka/releases/download/v1.4.0-rc/dokka-cli-1.4.0-rc.jar).
To generate documentation, run the following command:
```
java -jar dokka-cli.jar <arguments>
```
You can also use a JSON file with dokka configuration:
```
java -jar <dokka_cli.jar> <path_to_config.json>
```
### Output formats<a name="output_formats"></a>
Dokka documents Java classes as seen in Kotlin by default, with javadoc format being the only exception.
* `html` - HTML format used by default
* `javadoc` - looks like JDK's Javadoc, Kotlin classes are translated to Java
* `gfm` - GitHub flavored markdown
* `jekyll` - Jekyll compatible markdown
If you want to generate the documentation as seen from Java perspective, you can add the `kotlin-as-java` plugin
to the dokka plugins classpath, eg. in Gradle:
```kotlin
dependencies{
implementation("...")
dokkaGfmPlugin("org.jetbrains.dokka:kotlin-as-java-plugin:${dokka-version}")
}
```
#### FAQ
If you encounter any problems, please see the [FAQ](https://github.com/Kotlin/dokka/wiki/faq).
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