FULL PRODUCT VERSION :
java version "1.8.0_121"
Java(TM) SE Runtime Environment (build 1.8.0_121-b13)
Java HotSpot(TM) 64-Bit Server VM (build 25.121-b13, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows [Version 10.0.14393]

A DESCRIPTION OF THE PROBLEM :
Platform#getPlugins returns List<Object> when the specified return type is List<PluginSnapshot> when using the raw Platform type.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Setup the test code and refer to the for loop in the Main class.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Platform#getPlugins returns List<PluginSnapshot>
ACTUAL -
Platform#getPlugins returns List<Object>

ERROR MESSAGES/STACK TRACES THAT OCCUR :
Main.java
Error(5,57) java: incompatible types: java.lang.Object cannot be converted to PluginSnapshot

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
public interface Player {
    UUID getUniqueId();
}

public interface PluginSnapshot {
    String name();
}

public interface Platform<P extends Player> {
    List<P> getPlayers();
    List<PluginSnapshot> getPlugins();
}

public class Main {
    public static void main(String... args) {
        Platform platform = null;
        for (PluginSnapshot plugin : platform.getPlugins()) {
            // ...
        }
    }
}

---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
Specifying Platform<?> instead of Platform results in the correct behavior.