Add docs to abstract LegacyViaInjector methods

common/src/main/java/com/viaversion/viaversion/platform/LegacyViaInjector.java

@@ -238,9 +238,27 @@ public abstract class LegacyViaInjector implements ViaInjector {
         return "decoder";
     }
 
+    /**
+     * Returns the Vanilla server connection object the channels to be injected should be searched in.
+     *
+     * @return server connection object, or null if failed
+     */
     protected abstract @Nullable Object getServerConnection() throws ReflectiveOperationException;
 
+    /**
+     * Returns a new Via channel initializer wrapping the original one.
+     *
+     * @param oldInitializer original channel initializer
+     * @return wrapped Via channel initializer
+     */
     protected abstract WrappedChannelInitializer createChannelInitializer(ChannelInitializer<Channel> oldInitializer);
 
+    /**
+     * Should throw a {@link RuntimeException} with information on what/who might have caused an issue.
+     * Called when injection fails.
+     *
+     * @param bootstrapAcceptor head channel handler to be used when blaming
+     * @throws ReflectiveOperationException during reflective operation
+     */
     protected abstract void blame(ChannelHandler bootstrapAcceptor) throws ReflectiveOperationException;
 }

common/src/main/java/com/viaversion/viaversion/util/SynchronizedListWrapper.java

@@ -46,9 +46,7 @@ public final class SynchronizedListWrapper<E> implements List<E> {
     }
 
     private void handleAdd(E o) {
-        synchronized (this) {
+        addHandler.accept(o);
-            addHandler.accept(o);
-        }
     }
 
     @Override