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https://issues.apache.org/jira/browse/DRILL-5874?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16206368#comment-16206368
]
ASF GitHub Bot commented on DRILL-5874:
---------------------------------------
Github user paul-rogers commented on a diff in the pull request:
https://github.com/apache/drill/pull/993#discussion_r144930573
--- Diff:
exec/java-exec/src/test/java/org/apache/drill/exec/server/rest/WebSessionResourcesTest.java
---
@@ -0,0 +1,146 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.drill.exec.server.rest;
+
+import io.netty.channel.ChannelPromise;
+import io.netty.channel.DefaultChannelPromise;
+import io.netty.util.concurrent.EventExecutor;
+import io.netty.util.concurrent.Future;
+import io.netty.util.concurrent.GenericFutureListener;
+import org.apache.drill.exec.memory.BufferAllocator;
+import org.apache.drill.exec.rpc.TransportCheck;
+import org.apache.drill.exec.rpc.user.UserSession;
+import org.junit.Test;
+
+import java.net.SocketAddress;
+import java.util.concurrent.CountDownLatch;
+
+import static org.junit.Assert.assertTrue;
+import static org.junit.Assert.fail;
+import static org.mockito.Matchers.any;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.verify;
+
+public class WebSessionResourcesTest {
+ //private static final org.slf4j.Logger logger =
org.slf4j.LoggerFactory.getLogger(WebSessionResourcesTest.class);
+
+ private WebSessionResources webSessionResources;
+
+ private boolean listenerComplete;
+
+ private CountDownLatch latch;
+
+ private EventExecutor executor;
+
+
--- End diff --
Maybe a comment to explain what this test is, in fact, testing? If the
mechanism itself is explained elsewhere, simply reference that with a \@see or
\@link tag.
> NPE in AnonWebUserConnection.cleanupSession()
> ---------------------------------------------
>
> Key: DRILL-5874
> URL: https://issues.apache.org/jira/browse/DRILL-5874
> Project: Apache Drill
> Issue Type: Bug
> Affects Versions: 1.12.0
> Reporter: Paul Rogers
> Assignee: Sorabh Hamirwasia
> Fix For: 1.12.0
>
>
> When debugging another issue, I tried to use the Web UI to run the example
> query:
> {code}
> SELECT * FROM cp.`employee.json` LIMIT 20
> {code}
> The query failed with this error:
> {noformat}
> Query Failed: An Error Occurred
> java.lang.NullPointerException
> {noformat}
> No stack trace was provided in the log, even at DEBUG level.
> Debugging, the problem appears to be deep inside
> {{AnonWebUserConnection.cleanupSession()}}:
> {code}
> package io.netty.channel;
> public class DefaultChannelPromise ...
> protected EventExecutor executor() {
> EventExecutor e = super.executor();
> if (e == null) {
> return channel().eventLoop();
> } else {
> return e;
> }
> }
> {code}
> In the above, {{channel()}} is null. the {{channel}} field is also null.
> This may indicate that some part of the Web UI was not set up correctly. This
> is a recent change, as this code worked several days ago.
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