Gradle, Java plugin, Jar MANIFEST, Class-Path is empty
======================================================

I struggled with with the jar MANIFEST file built with Gradle containing an empty `Class-Path`. I traced down the problem to the order of the `dependencies` and `jar` blocks in the `build.gradle` file:


Wrong (`jar` before `dependencies`):
```gradle
jar {
    manifest.attributes(
            // Class-Path won't contain "guava-15.0.jar"
            'Class-Path': configurations.runtime.files.collect { it.name }.join(' ')
    )
}

repositories {
    mavenCentral()
}

dependencies {
    compile group: 'com.google.guava', name: 'guava', version: '15.0'
}
```

Correct (`jar` after `dependencies`):
```gradle
repositories {
    mavenCentral()
}

dependencies {
    compile group: 'com.google.guava', name: 'guava', version: '15.0'
}

jar {
    manifest.attributes(
            // results in "Class-Path: guava-15.0.jar"
            'Class-Path': configurations.runtime.files.collect { it.name }.join(' ')
    )
}
```