CODEWITHSUNDEEP
javahadoop
georgiana_e
georgiana_e

Reputation: 1869

Exception in thread "main" java.lang.UnsupportedClassVersionError, Unsupported major.minor version 52.0

I am trying to run the WordCount example on hadoop - 1.0.4 and I am getting the following error:

Exception in thread "main" java.lang.UnsupportedClassVersionError: WordCount :
Unsupported major.minor version 52.0
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:791)
    at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
    at java.net.URLClassLoader.defineClass(URLClassLoader.java:449)
    at java.net.URLClassLoader.access$100(URLClassLoader.java:71)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:423)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:356)
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Class.java:264)
    at org.apache.hadoop.util.RunJar.main(RunJar.java:149)

I use the following java version:

java version "1.7.0_11"
Java(TM) SE Runtime Environment (build 1.7.0_11-b21)
Java HotSpot(TM) Server VM (build 23.6-b04, mixed mode)

Also JAVA_HOME indicates to the java7 installation directory.

Thanks for your help.

Upvotes: 23

Views: 45816

Answers (7)

niks
niks

Reputation: 111

I also encountered the same problem.Should use same JAVA version for compile and same or greater on where you are executing it although vice-versa cause this error. If you checked:

  1. Window > Preferences > Compiler > compiler level
  2. java -version and both has same version then you are good to go. While creating New Project in Eclipse: File -> New -> Java Project under JRE check Use an execution environmententer image description here and set to same version which is on your system and system where you need to execute this project.

Upvotes: 0

Albert
Albert

Reputation: 41

I had the same problem which I solved. I found that the JAVA_HOME in my hadoop-env.sh is /usr/lib/jvm/java-6-openjdk but the JAVA_HOME in /etc/profile is /usr/local/java/jdk1.8.0_25.

After I change JAVA_HOME in /etc/profile to /usr/lib/jvm/java-6-openjdk which is the same as hadoop-env.sh and use $source /etc/profile # to make /etc/profile effects

My problem is solved! I hope this will help you.

Upvotes: 4

ppant
ppant

Reputation: 762

I think you already got your answer ..just to add, in eclipse under project there is a JRE System Library [JavaSE-1.x] folder .. right click on it you will see JRE System Library screen..there you can set the execution environment.

Upvotes: 0

prash.gaikwad4
prash.gaikwad4

Reputation: 41

The problem is due to .jsp files are getting compiled with higher compiler(8) than expected(7). Change all compilation levels to lower one(i.e. 7) also change the jdk path given in eclipse configuration settings file in the same folder where .exe is located.

Upvotes: 0

Suresh Atta
Suresh Atta

Reputation: 121998

Seems like you are using JDK8 for compiling and Lower version on Where you are using it.

So

Assuming using eclipse, Window > Preferences > Compiler > compiler level

and then set lower level(< current one ).

Upvotes: 19

saurav
saurav

Reputation: 3462

Well obviously that won't work! You are compiling on a newer JDK and deploying on an older JDK / JRE. You need to compile on the older JDK.

Upvotes: 0

chrylis -cautiouslyoptimistic-
chrylis -cautiouslyoptimistic-

Reputation: 77187

Looks like someone managed to compile a class with a Java 8 compiler. Recompile the offending jar with a compliance level of Java 7 or lower.

Upvotes: 0

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