Added automatic retries when receiving null responses from GameBanana

README.md

@@ -48,7 +48,7 @@ Get Maven, then run the following command at the project root:
 mvn clean package
 ```
 
-This will build the project to `target/update-checker-0.0.13.jar`.
+This will build the project to `target/update-checker-0.0.14.jar`.
 
 ## Running the project
 
@@ -61,7 +61,7 @@ First, follow these steps to set it up:
 Then, to run the project, browse to where the JAR is in a terminal / command prompt, then run
 
 ```
-java -jar update-checker-0.0.13.jar [port] [minutes]
+java -jar update-checker-0.0.14.jar [port] [minutes]
 ```
 
 [port] is the HTTP port for the server. If you don't provide any, there won't be any server hosted (useful if you already have something else hosting the files).

pom.xml

@@ -6,7 +6,7 @@
 
     <groupId>com.max480.everest.updatechecker</groupId>
     <artifactId>update-checker</artifactId>
-    <version>0.0.13</version>
+    <version>0.0.14</version>
 
     <properties>
         <jdk.version>1.8</jdk.version>

src/main/java/com/max480/everest/updatechecker/DatabaseUpdater.java

@@ -134,7 +134,8 @@ private boolean loadPage(int page) throws IOException {
 
         List<List<Object>> mods = runWithRetry(() -> {
             try (InputStream is = openStreamWithTimeout(new URL("https://api.gamebanana.com/Core/List/New?page=" + page + "&gameid=6460&format=yaml"))) {
-                return new Yaml().load(is);
+                return Optional.ofNullable(new Yaml().<List<List<Object>>>load(is))
+                        .orElseThrow(() -> new IOException("Ended up with a null value when loading a mod page"));
             }
         });
 
@@ -233,7 +234,8 @@ private void loadPageModInfo(String modInfoUrl, List<QueriedModInfo> queriedModI
         log.trace("Mod info URL: {}", modInfoUrl);
         List<List<Object>> mods = runWithRetry(() -> {
             try (InputStream is = openStreamWithTimeout(new URL(modInfoUrl))) {
-                return new Yaml().load(is);
+                return Optional.ofNullable(new Yaml().<List<List<Object>>>load(is))
+                        .orElseThrow(() -> new IOException("Ended up with a null value when loading mod info"));
             }
         });
 

src/main/java/com/max480/everest/updatechecker/ModSearchDatabaseBuilder.java

@@ -201,7 +201,8 @@ private void fetchAuthorNames() throws IOException {
             // run the request, parse the result, and add this result to the list.
             authorNames = DatabaseUpdater.runWithRetry(() -> {
                 try (InputStream is = DatabaseUpdater.openStreamWithTimeout(new URL(url))) {
-                    return new Yaml().load(is);
+                    return Optional.ofNullable(new Yaml().<List<List<Object>>>load(is))
+                            .orElseThrow(() -> new IOException("Ended up with a null value when loading a mod page"));
                 }
             });
         }