[infrastructure] move infered nullness warnings to error and update EEA (#8949)

Signed-off-by: Jan N. Klug <jan.n.klug@rub.de>

bundles/org.openhab.binding.foobot/src/main/java/org/openhab/binding/foobot/internal/FoobotApiConnector.java

@@ -20,6 +20,7 @@ import java.net.URLEncoder;
 import java.nio.charset.StandardCharsets;
 import java.util.ArrayList;
 import java.util.List;
+import java.util.Objects;
 import java.util.concurrent.ExecutionException;
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.TimeoutException;
@@ -95,7 +96,8 @@ public class FoobotApiConnector {
                     URLEncoder.encode(username, StandardCharsets.UTF_8.toString()));
             logger.debug("URL = {}", url);
 
-            return GSON.fromJson(request(url, apiKey), FOOTBOT_DEVICE_LIST_TYPE);
+            List<FoobotDevice> foobotDevices = GSON.fromJson(request(url, apiKey), FOOTBOT_DEVICE_LIST_TYPE);
+            return Objects.requireNonNull(foobotDevices);
         } catch (JsonParseException | UnsupportedEncodingException e) {
             throw new FoobotApiException(0, e.getMessage());
         }

bundles/org.openhab.binding.foobot/src/test/java/org/openhab/binding/foobot/internal/handler/FoobotDeviceHandlerTest.java

@@ -17,6 +17,7 @@ import static org.junit.jupiter.api.Assertions.*;
 import java.io.IOException;
 import java.io.InputStream;
 import java.nio.charset.StandardCharsets;
+import java.util.Objects;
 
 import org.junit.jupiter.api.Test;
 import org.mockito.Mock;
@@ -53,6 +54,7 @@ public class FoobotDeviceHandlerTest {
         final FoobotJsonData sensorData = connector.getSensorData("1234");
 
         assertNotNull(sensorData, "No sensor data read");
+        Objects.requireNonNull(sensorData);
         assertEquals(handler.sensorDataToState("temperature", sensorData), new QuantityType(12.345, SIUnits.CELSIUS));
         assertEquals(handler.sensorDataToState("gpi", sensorData), new DecimalType(5.6789012));
     }