Unsupported major.minor version 52.0 when running Java 1.8 on AWS EMR
I am trying to run Java 1.8 Map Reduce Job over AWS EMR. I have set compilation compliance and JRE version to 1.8. But still it gives the following error on startup.
Since I am using one stanford API, I cannot switch to lower Java versions. Can someone please help me here.
Exception in thread "main" java.lang.UnsupportedClassVersionError: org/neu/mr/cs6750/reducerjoin/ReduceSideJoin : Unsupported major.minor version 52.0
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:800)
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:425)
at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:274)
at org.apache.hadoop.util.RunJar.main(RunJar.java:205)
+3
source to share
1 answer
Use this configuration to run EMR with java8. This sets the hasoop-env environment variable i.e. java8 java8 environment variable
[{"configuration": [{"classification": "export", "Property":> {"JAVA_HOME": "/USR/Library/JVM/Java-1.8.0"}}], "classification": "hadoop -> env "," properties ": {}}]
-1
source to share