Use Jsonb more effectively (#5047)

media/json-binding/src/main/java/org/glassfish/jersey/jsonb/internal/JsonBindingProvider.java

diff --git a/media/json-binding/src/main/java/org/glassfish/jersey/jsonb/internal/JsonBindingProvider.java b/media/json-binding/src/main/java/org/glassfish/jersey/jsonb/internal/JsonBindingProvider.java
index 98ea299..efc7c81 100644
--- a/media/json-binding/src/main/java/org/glassfish/jersey/jsonb/internal/JsonBindingProvider.java
+++ b/media/json-binding/src/main/java/org/glassfish/jersey/jsonb/internal/JsonBindingProvider.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2017, 2020 Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2017, 2022 Oracle and/or its affiliates. All rights reserved.
  *
  * This program and the accompanying materials are made available under the
  * terms of the Eclipse Public License v. 2.0, which is available at
@@ -19,9 +19,17 @@
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStream;
+import java.io.OutputStreamWriter;
 import java.lang.annotation.Annotation;
 import java.lang.reflect.Type;
 
+import org.glassfish.jersey.jsonb.LocalizationMessages;
+import org.glassfish.jersey.message.internal.AbstractMessageReaderWriterProvider;
+import org.glassfish.jersey.message.internal.EntityInputStream;
+
+import jakarta.json.bind.Jsonb;
+import jakarta.json.bind.JsonbBuilder;
+import jakarta.json.bind.JsonbException;
 import jakarta.ws.rs.Consumes;
 import jakarta.ws.rs.ProcessingException;
 import jakarta.ws.rs.Produces;
@@ -34,14 +42,6 @@
 import jakarta.ws.rs.ext.Provider;
 import jakarta.ws.rs.ext.Providers;
 
-import jakarta.json.bind.Jsonb;
-import jakarta.json.bind.JsonbBuilder;
-import jakarta.json.bind.JsonbException;
-
-import org.glassfish.jersey.jsonb.LocalizationMessages;
-import org.glassfish.jersey.message.internal.AbstractMessageReaderWriterProvider;
-import org.glassfish.jersey.message.internal.EntityInputStream;
-
 /**
  * Entity provider (reader and writer) for JSONB.
  *
@@ -100,9 +100,8 @@
                         OutputStream entityStream) throws IOException, WebApplicationException {
         Jsonb jsonb = getJsonb(type);
         try {
-            entityStream.write(jsonb.toJson(o).getBytes(AbstractMessageReaderWriterProvider.getCharset(mediaType)));
-            entityStream.flush();
-        } catch (IOException e) {
+            jsonb.toJson(o, genericType, new OutputStreamWriter(entityStream, getCharset(mediaType)));
+        } catch (JsonbException e) {
             throw new ProcessingException(LocalizationMessages.ERROR_JSONB_SERIALIZATION(), e);
         }
     }