ALS-6551: Attempt to fix character encoding issue

processing/src/test/java/edu/harvard/hms/dbmi/avillach/hpds/processing/io/PfbWriterTest.java

@@ -5,6 +5,7 @@
 import org.mockito.junit.jupiter.MockitoExtension;
 
 import java.io.File;
+import java.util.ArrayList;
 import java.util.List;
 
 import static org.junit.jupiter.api.Assertions.*;
@@ -17,6 +18,15 @@ public void writeValidPFB() {
         PfbWriter pfbWriter = new PfbWriter(new File("target/test-result.avro"));
 
         pfbWriter.writeHeader(new String[] {"patient_id", "\\demographics\\age\\", "\\phs123\\stroke\\"});
+        List<List<String>> nullableList = new ArrayList<>();
+        nullableList.add(List.of("123"));
+        nullableList.add(null);
+        nullableList.add(List.of("Y"));
+        pfbWriter.writeMultiValueEntity(List.of(
+                nullableList,
+                List.of(List.of("456"), null ,List.of("N", "Y")),
+                List.of(List.of(), List.of("75"), List.of())
+        ));
         pfbWriter.writeMultiValueEntity(List.of(
                 List.of(List.of("123"), List.of("80"), List.of("Y")),
                 List.of(List.of("456"), List.of("70"),List.of("N", "Y")),

service/src/main/java/edu/harvard/hms/dbmi/avillach/hpds/service/PicSureService.java

@@ -230,7 +230,7 @@ public ResponseEntity queryResult(@PathVariable("resourceQueryId") UUID queryId,
 			result.open();
 			return ResponseEntity.ok()
 					.contentType(MediaType.TEXT_PLAIN)
-					.body(new String(result.readAllBytes(), StandardCharsets.UTF_8));
+					.body(result.readAllBytes());
 		} else {
 			return ResponseEntity.status(400).body("Status : " + result.getStatus().name());
 		}