[servlet] Replace invalid isReady call with isInitialized() (Fix javalin#1752) (javalin#1831)

* [servlet] Replace invalid `isReady` call with `isInitialized()` (Fix javalin#1752)

* [servlet] Add missing change

Author: dzikoysk

javalin/src/main/java/io/javalin/http/servlet/JavalinServlet.kt

@@ -104,7 +104,7 @@ class JavalinServlet(val cfg: JavalinConfig) : HttpServlet() {
         } catch (throwable: Throwable) {
             exceptionMapper.handleUnexpectedThrowable(res(), throwable) // handle any unexpected error, e.g. write failure
         } finally {
-            if (outputStreamWrapper.isReady) outputStream().close() // close initialized output wrappers
+            if (outputStreamWrapper.isInitialized()) outputStream().close() // close initialized output wrappers
             if (isAsync()) req().asyncContext.complete() // guarantee completion of async context to eliminate the possibility of hanging connections
         }
     }

javalin/src/main/java/io/javalin/http/servlet/JavalinServletContext.kt

@@ -108,8 +108,8 @@ class JavalinServletContext(
     private val queryParams by lazy { super.queryParamMap() }
     override fun queryParamMap(): Map<String, List<String>> = queryParams
 
-    internal val outputStreamWrapper by lazy { CompressedOutputStream(compressionStrategy, this) }
-    override fun outputStream(): ServletOutputStream = outputStreamWrapper
+    internal val outputStreamWrapper = lazy { CompressedOutputStream(compressionStrategy, this) }
+    override fun outputStream(): ServletOutputStream = outputStreamWrapper.value
 
     override fun redirect(location: String, status: HttpStatus) {
         header(Header.LOCATION, location).status(status).result("Redirected")