Streamflyer 1.2.0 is compiled with source code level 1.6.
Streamflyer 1.2.0 can be downloaded from Maven Central.
The Maven coordinates are
<dependency>
<groupId>com.github.rwitzel.streamflyer</groupId>
<artifactId>streamflyer-core</artifactId>
<version>1.2.0</version>
</dependency>
Streamflyer 1.2.0 depends on Commons IO.
The maven coordinates of that dependency are
<dependency>
<groupId>commons-io</groupId>
<artifactId>commons-io</artifactId>
<version>2.0</version>
</dependency>