I would like to simulate the behaviour of maven for this pom.xml:

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>example.com</groupId>
<artifactId>example</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>pom</packaging>
<name>application</name>

<dependencies>
<dependency>
<groupId>org.apache.shiro</groupId>
<artifactId>shiro-spring</artifactId>
<version>1.2.2</version>
</dependency>
</dependencies>
</project>

mvn dependency:tree gives me:

[INFO] — maven-dependency-plugin:2.1:tree (default-cli) @ example —
[INFO] example.com:example:pom:1.0-SNAPSHOT
[INFO] - org.apache.shiro:shiro-spring:jar:1.2.2:compile
[INFO] +- org.apache.shiro:shiro-core:jar:1.2.2:compile
[INFO] | +- org.slf4j:slf4j-api:jar:1.6.4:compile
[INFO] | - commons-beanutils:commons-beanutils:jar:1.8.3:compile
[INFO] - org.apache.shiro:shiro-web:jar:1.2.2:compile

Now my gradle build file looks like this:

apply plugin: 'java'

repositories {
mavenCentral()
}

dependencies {
compile("org.apache.shiro:shiro-spring:1.2.2")
}

and the output of gradle dependencies looks like this (without the other configs that have the same result):

compile - Compile classpath for source set 'main'.
--- org.apache.shiro:shiro-spring:1.2.2
--- org.apache.shiro:shiro-web:1.2.2

So, where is the dependency to shiro-core? Why is it missing and what do I have to change to get the same results as with maven?