Re: Why the major.minor version of the new hive-exec is 51.0?

[Ted Yu]

I extracted org/apache/hadoop/hive/common/CompressionUtils.class from the
jar and used hexdump to view the class file.
Bytes 6 and 7 are 00 and 33, respectively.

According to http://en.wikipedia.org/wiki/Java_class_file, the jar was
produced using Java 7.

FYI

On Tue, Dec 30, 2014 at 8:09 PM, Shixiong Zhu <zsxw...@gmail.com> wrote:

> The major.minor version of the new org.spark-project.hive.hive-exec is
> 51.0, so it will require people use JDK7. Is it intentional?
>
> <dependency>
> <groupId>org.spark-project.hive</groupId>
> <artifactId>hive-exec</artifactId>
> <version>0.12.0-protobuf-2.5</version>
> </dependency>
>
> You can use the following steps to reproduce it (Need to use JDK6):
>
> 1. Create a Test.java file with the following content:
>
> public class Test {
>
>     public static void main(String[] args) throws Exception{
>        Class.forName("org.apache.hadoop.hive.conf.HiveConf");
>     }
>
> }
>
> 2. javac Test.java
> 3. java -classpath
>
> ~/.m2/repository/org/spark-project/hive/hive-exec/0.12.0-protobuf-2.5/hive-exec-0.12.0-protobuf-2.5.jar:.
> Test
>
> Exception in thread "main" java.lang.UnsupportedClassVersionError:
> org/apache/hadoop/hive/conf/HiveConf : Unsupported major.minor version 51.0
> at java.lang.ClassLoader.defineClass1(Native Method)
> at java.lang.ClassLoader.defineClassCond(ClassLoader.java:631)
> at java.lang.ClassLoader.defineClass(ClassLoader.java:615)
> at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)
> at java.net.URLClassLoader.defineClass(URLClassLoader.java:283)
> at java.net.URLClassLoader.access$000(URLClassLoader.java:58)
> at java.net.URLClassLoader$1.run(URLClassLoader.java:197)
> at java.security.AccessController.doPrivileged(Native Method)
> at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
> at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
> at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
> at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
> at java.lang.Class.forName0(Native Method)
> at java.lang.Class.forName(Class.java:169)
> at Test.main(Test.java:5)
>
>
> Best Regards,
> Shixiong Zhu
>