Autoclose writer instance

Change-Id: I9e20e6b46bfc7f892bd602eb69530f9cf9835e5c
diff --git a/src/main/java/com/ericsson/gerrit/plugins/eventslog/EventsRestApiServlet.java b/src/main/java/com/ericsson/gerrit/plugins/eventslog/EventsRestApiServlet.java
index 41e90e2..03e5076 100644
--- a/src/main/java/com/ericsson/gerrit/plugins/eventslog/EventsRestApiServlet.java
+++ b/src/main/java/com/ericsson/gerrit/plugins/eventslog/EventsRestApiServlet.java
@@ -62,11 +62,9 @@
     rsp.setContentType("text/html");
     Map<String, String> params =
         req.getQueryString() != null ? getParameters(req) : null;
-    Writer out = rsp.getWriter();
 
-    String query = null;
-    try {
-      query = queryMaker.formQueryFromRequestParameters(params);
+    try (Writer out = rsp.getWriter()) {
+      String query = queryMaker.formQueryFromRequestParameters(params);
       for (String event : store.queryChangeEvents(query)) {
         out.write(event + "\n");
       }