HDDS-773. Loading ozone s3 bucket browser could be failed. Contributed by Elek Marton.

(cherry picked from commit 478b2cba0de5aadf655ac0b5a607760d46cc2a1e)

hadoop-ozone/dist/src/main/smoketest/s3/README.md

@@ -23,5 +23,5 @@ You need to
   3. Set bucket/endpointurl during the robot test execution
 
 ```
-robot -v bucket:ozonetest -v OZONE_S3_SET_CREDENTIALS:false -v ENDPOINT_URL:https://s3.us-east-2.amazonaws.com smoketest/s3
+robot -v bucket:ozonetest -v OZONE_TEST:false -v OZONE_S3_SET_CREDENTIALS:false -v ENDPOINT_URL:https://s3.us-east-2.amazonaws.com smoketest/s3
 ```

hadoop-ozone/s3gateway/pom.xml

@@ -174,5 +174,11 @@
       <version>2.15.0</version>
       <scope>test</scope>
     </dependency>
+    <dependency>
+      <groupId>com.google.code.findbugs</groupId>
+      <artifactId>findbugs</artifactId>
+      <version>3.0.1</version>
+      <scope>provided</scope>
+    </dependency>
   </dependencies>
 </project>

hadoop-ozone/s3gateway/src/main/java/org/apache/hadoop/ozone/s3/endpoint/BucketEndpoint.java

@@ -46,6 +46,7 @@ import org.apache.hadoop.ozone.s3.endpoint.MultiDeleteResponse.Error;
 import org.apache.hadoop.ozone.s3.exception.OS3Exception;
 import org.apache.hadoop.ozone.s3.exception.S3ErrorTable;
 
+import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
 import org.apache.commons.lang3.StringUtils;
 import org.apache.hadoop.ozone.s3.util.S3utils;
 import org.apache.http.HttpStatus;
@@ -70,6 +71,7 @@ public class BucketEndpoint extends EndpointBase {
    * for more details.
    */
   @GET
+  @SuppressFBWarnings
   public Response list(
       @PathParam("bucket") String bucketName,
       @QueryParam("delimiter") String delimiter,
@@ -83,12 +85,12 @@ public class BucketEndpoint extends EndpointBase {
       @Context HttpHeaders hh) throws OS3Exception, IOException {
 
     if (browser != null) {
-      try (InputStream browserPage = getClass()
-          .getResourceAsStream("/browser.html")) {
-        return Response.ok(browserPage,
+      InputStream browserPage = getClass()
+          .getResourceAsStream("/browser.html");
+      return Response.ok(browserPage,
             MediaType.TEXT_HTML_TYPE)
             .build();
-      }
+
     }
 
     if (prefix == null) {
@@ -295,7 +297,8 @@ public class BucketEndpoint extends EndpointBase {
     keyMetadata.setSize(next.getDataSize());
     keyMetadata.setETag("" + next.getModificationTime());
     keyMetadata.setStorageClass("STANDARD");
-    keyMetadata.setLastModified(Instant.ofEpochMilli(next.getModificationTime()));
+    keyMetadata.setLastModified(Instant.ofEpochMilli(
+        next.getModificationTime()));
     response.addKey(keyMetadata);
   }
 }