Make java file write wait by using reduce instead of count (#528)

* Make java file write wait by using reduce instead of count

* Remove unused pool

* Cleanup unused imports

---------

Co-authored-by: Karthik Ramgopal <kramgopa@linkedin.com>

avro-builder/builder/src/main/java/com/linkedin/avroutil1/builder/operations/codegen/own/AvroUtilCodeGenOp.java

@@ -341,18 +341,18 @@ private void writeJavaFilesToDisk(Collection<JavaFile> javaFiles, Path outputFol
     long writeStart = System.currentTimeMillis();
 
     // write out the files we generated
-    long numFilesWritten = javaFiles.parallelStream().map(javaFile -> {
+    int filesWritten = javaFiles.parallelStream().map(javaFile -> {
       try {
         javaFile.writeToPath(outputFolderPath);
       } catch (Exception e) {
         throw new IllegalStateException("while writing file " + javaFile.typeSpec.name, e);
       }
 
-      return null;
-    }).count();
+      return 1;
+    }).reduce(0, Integer::sum);
 
     long writeEnd = System.currentTimeMillis();
-    LOGGER.info("wrote out {} generated java source files under {} in {} millis", numFilesWritten, outputFolderPath,
+    LOGGER.info("wrote out {} generated java source files under {} in {} millis", filesWritten, outputFolderPath,
         writeEnd - writeStart);
   }
 }