dependencies.html.md.erb

---
title: Declare App Dependencies
owner: Daniel Freitag
---

<strong><%= modified_date %></strong>

<%= vars.product_short %> uses the Java buildpack to execute the uploaded JAR file as application package. The Java buildpack will run your application using the `main()` method of the `Main` class declared in the `build.gradle` file.

The dependencies needed for the application are also declared in the `build.gradle` file and are therefore included in the standalone JAR.

The `build.gradle` file of your deployed sample app looks something like this:


```groovy
apply plugin: 'java'

sourceCompatibility = 1.8
version = '1.0'

jar {
    manifest {
        attributes 'Implementation-Title': 'CF Java Sample App',
            'Implementation-Version': version,
            'Main-Class': 'com.swisscom.cloud.cloudfoundry.sampleapp.java.ProductService'
    }
    from {
        (configurations.runtime).collect {
            it.isDirectory() ? it : zipTree(it)
        }
    }
    exclude 'META-INF/*.RSA', 'META-INF/*.SF','META-INF/*.DSA'
}

repositories {
    mavenCentral()
}

dependencies {
    compile 'com.sparkjava:spark-core:2.5'
    compile 'com.fasterxml.jackson.core:jackson-databind:2.8.4'
}

...
```

The `build.gradle` file declares both the version of Java that will be used to run your application on <%= vars.product_short %>, as well as the dependencies that should be installed with your application.

To install the required dependencies, simply compile/build your application with:

<pre class="terminal">
$ gradle build

...

:compileJava
:processResources UP-TO-DATE
:classes
:jar
:assemble
:compileTestJava UP-TO-DATE
:processTestResources UP-TO-DATE
:testClasses UP-TO-DATE
:test UP-TO-DATE
:check UP-TO-DATE
:build

BUILD SUCCESSFUL

Total time: 6.78 secs
</pre>

<div style="text-align:center;margin:3em;">
  <a href="./run-locally.html" class="btn btn-primary">I've installed the App dependencies locally</a>
</div>