build: Add support for Java 16

This pull request adds support for building OpenDC using Java 16. 

To make this possible, we have upgraded the following dependencies:
- Kotlin from 1.4.3 to 1.5.0
- Jacoco from 0.8.6 to 0.8.7
- Gradle from 7.0 to 7.0.2

2 files changed, 3 insertions, 3 deletions

diff --git a/opendc-experiments/opendc-experiments-tf20/src/main/kotlin/org/opendc/experiments/tf20/keras/Sequential.kt b/opendc-experiments/opendc-experiments-tf20/src/main/kotlin/org/opendc/experiments/tf20/keras/Sequential.kt
index 411ddb59..83995fa1 100644
--- a/opendc-experiments/opendc-experiments-tf20/src/main/kotlin/org/opendc/experiments/tf20/keras/Sequential.kt
+++ b/opendc-experiments/opendc-experiments-tf20/src/main/kotlin/org/opendc/experiments/tf20/keras/Sequential.kt
@@ -49,10 +49,10 @@ public class Sequential(vararg layers: Layer) : TrainableModel(*layers) {
     }
 
     override fun forward(): Double {
-        return layers.sumByDouble { it.forward() }
+        return layers.sumOf { it.forward() }
     }
 
     override fun backward(): Double {
-        return layers.sumByDouble { it.backward() }
+        return layers.sumOf { it.backward() }
     }
 }
diff --git a/opendc-experiments/opendc-experiments-tf20/src/main/kotlin/org/opendc/experiments/tf20/network/NetworkController.kt b/opendc-experiments/opendc-experiments-tf20/src/main/kotlin/org/opendc/experiments/tf20/network/NetworkController.kt
index 75b11423..9771cc20 100644
--- a/opendc-experiments/opendc-experiments-tf20/src/main/kotlin/org/opendc/experiments/tf20/network/NetworkController.kt
+++ b/opendc-experiments/opendc-experiments-tf20/src/main/kotlin/org/opendc/experiments/tf20/network/NetworkController.kt
@@ -82,7 +82,7 @@ public class NetworkController(context: CoroutineContext, clock: Clock) : AutoCl
 
         val target = channels[to] ?: return // Drop if destination not found
 
-        scheduler.startSingleTimer(message, delayTime) { target.offer(message) }
+        scheduler.startSingleTimer(message, delayTime) { target.trySend(message) }
     }
 
     /**