fix IllegalStateException?

Author: tildejustin

src/main/java/me/voidxwalker/worldpreview/StateOutputHelper.java

@@ -15,7 +15,6 @@
  */
 public final class StateOutputHelper {
     private static final Path OUT_PATH = Paths.get("wpstateout.txt");
-    private static final ExecutorService EXECUTOR = Executors.newSingleThreadExecutor();
     // Storage variable, not necessarily involved or required for using outputState()
     public static int loadingProgress = 0;
     public static boolean titleHasEverLoaded = false;
@@ -40,11 +39,10 @@ public static void outputState(String string) {
         }
         lastOutput = string;
 
-        // Queue up the file writes as to not interrupt mc itself
-        EXECUTOR.execute(() -> outputStateInternal(string));
+        outputStateInternal(string);
     }
 
-    private static void outputStateInternal(String string) {
+    private synchronized static void outputStateInternal(String string) {
         try {
             if(stateFile == null){ // opening file only once is better for performance
                 stateFile = new RandomAccessFile(OUT_PATH.toString(), "rw");