Add java 25 to test matrix, Hopefully fix void problem

Author: JulianVennen

.github/workflows/build.yml

@@ -5,7 +5,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        java: [11, 17, 21]
+        java: [11, 17, 21, 25]
       fail-fast: false
     steps:
       - uses: actions/checkout@v4

src/main/java/gs/mclo/api/internal/JsonBodyHandler.java

@@ -3,6 +3,7 @@
 import com.google.gson.JsonElement;
 import gs.mclo.api.APIException;
 import gs.mclo.api.MclogsClient;
+import org.jetbrains.annotations.Nullable;
 
 import java.net.http.HttpResponse;
 import java.util.concurrent.CompletionException;
@@ -17,17 +18,21 @@ public JsonBodyHandler(MclogsClient client, Class<T> clazz) {
     }
 
     @Override
-    public HttpResponse.BodySubscriber<T> apply(HttpResponse.ResponseInfo responseInfo) {
+    public HttpResponse.BodySubscriber<@Nullable T> apply(HttpResponse.ResponseInfo responseInfo) {
         return HttpResponse.BodySubscribers.mapping(new JsonElementBodySubscriber(client.gson()), x -> map(x, responseInfo));
     }
 
-    T map(JsonElement element, HttpResponse.ResponseInfo responseInfo) {
+    @Nullable T map(JsonElement element, HttpResponse.ResponseInfo responseInfo) {
         if (!element.isJsonObject()) {
             throw new CompletionException(new APIException("Invalid API response (Status code: " + responseInfo.statusCode() + ")", responseInfo.statusCode()));
         }
 
         checkError(element, responseInfo);
 
+        if (clazz == Void.class) {
+            return null;
+        }
+
         var body = client.gson().fromJson(element, clazz);
 
         if (body instanceof Initializable) {