maven profile

<!-- This profile helps to make things run out of the box in IntelliJ -->
    <!-- Its adds Flink's core classes to the runtime class path. -->
    <!-- Otherwise they are missing in IntelliJ, because the dependency is 'provided' -->
    <profiles>
        <profile>
            <id>add-dependencies-for-IDEA</id>

            <activation>
                <property>
                    <name>idea.version</name>
                </property>
            </activation>

            <dependencies>
                <dependency>
                    <groupId>org.apache.flink</groupId>
                    <artifactId>flink-java</artifactId>
                    <version>${flink.version}</version>
                    <scope>compile</scope>
                </dependency>
                <dependency>
                    <groupId>org.apache.flink</groupId>
                    <artifactId>flink-streaming-java_${scala.binary.version}</artifactId>
                    <version>${flink.version}</version>
                    <scope>compile</scope>
                </dependency>
            </dependencies>
        </profile>
    </profiles>