title: Hive: AppClassLoader cannot be cast to URLClassLoader although using JDK8
body: <p>After installing <code>jdk9</code> I have been seeing this problem:</p>
  
  <pre><code>$hive
  Java HotSpot(TM) 64-Bit Server VM warning: Ignoring option MaxPermSize; support was removed in 8.0
  SLF4J: Class path contains multiple SLF4J bindings.
  SLF4J: Found binding in [jar:file:/usr/local/Cellar/hive/2.3.1/libexec/lib/log4j-slf4j-impl-2.6.2.jar!/org/slf4j/impl/StaticLoggerBinder.class]
  SLF4J: Found binding in [jar:file:/usr/local/Cellar/hadoop/2.8.1/libexec/share/hadoop/common/lib/slf4j-log4j12-1.7.10.jar!/org/slf4j/impl/StaticLoggerBinder.class]
  SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
  SLF4J: Actual binding is of type [org.apache.logging.slf4j.Log4jLoggerFactory]
  Exception in thread "main" java.lang.ClassCastException: java.base/jdk.internal.loader.ClassLoaders$AppClassLoader cannot be cast to java.base/java.net.URLClassLoader
      at org.apache.hadoop.hive.ql.session.SessionState.&lt;init&gt;(SessionState.java:394)
      at org.apache.hadoop.hive.ql.session.SessionState.&lt;init&gt;(SessionState.java:370)
      at org.apache.hadoop.hive.cli.CliSessionState.&lt;init&gt;(CliSessionState.java:60)
      at org.apache.hadoop.hive.cli.CliDriver.run(CliDriver.java:708)
      at org.apache.hadoop.hive.cli.CliDriver.main(CliDriver.java:686)
      at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
      at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
      at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
      at java.base/java.lang.reflect.Method.invoke(Method.java:564)
      at org.apache.hadoop.util.RunJar.run(RunJar.java:234)
      at org.apache.hadoop.util.RunJar.main(RunJar.java:148)
  </code></pre>
  
  <p>But I have </p>
  
  <p><em>Updated <code>$PATH</code> to point to java8</em></p>
  
  <pre><code>$java -version
  java version "1.8.0_144"
  Java(TM) SE Runtime Environment (build 1.8.0_144-b01)
  Java HotSpot(TM) 64-Bit Server VM (build 25.144-b01, mixed mode)
  </code></pre>
  
  <p><em>Updated <code>hive</code> executable to specify java8</em></p>
  
  <pre><code>vi $(which hive)
  
  #!/bin/bash
  JAVA_HOME="$(/usr/libexec/java_home --version 1.8)" HIVE_HOME="/usr/local/Cellar/hive/2.3.1/libexec" exec "/usr/local/Cellar/hive/2.3.1/libexec/bin/hive" "$@"
  </code></pre>
  
  <p><em>Verified the updated java version does point to jdk8</em></p>
  
  <pre><code>$/usr/libexec/java_home --version 1.8
  /Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home
  </code></pre>
  
  <p>What else should I be looking into here?</p>
  
  <p>This is <code>hive 2.3.1</code> on <code>macos</code></p>
  
  <pre><code> $hive --version
  Hive 2.3.1
  Git git://jcamachorodriguez-rMBP.local/Users/jcamachorodriguez/src/workspaces/hive/HIVE-apache/hive -r 7590572d9265e15286628013268b2ce785c6aa08
  Compiled by jcamachorodriguez on Thu Oct 19 18:37:58 PDT 2017
  From source with checksum 03c91029a6103bd91f25a6ff8a01fbcd
  </code></pre>