Unable to start historical/coordinator/realtime node (Unsupported major.minor version 51.0)

[Deepak Jain]

Hello, 

This is for documentation and for other users.

Error:

Exception in thread "main" java.lang.UnsupportedClassVersionError: io/druid/cli/Main : Unsupported major.minor version 51.0

at java.lang.ClassLoader.defineClass1(Native Method)

at java.lang.ClassLoader.defineClass(ClassLoader.java:643)

at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)

at java.net.URLClassLoader.defineClass(URLClassLoader.java:277)

at java.net.URLClassLoader.access$000(URLClassLoader.java:73)

at java.net.URLClassLoader$1.run(URLClassLoader.java:212)

at java.security.AccessController.doPrivileged(Native Method)

at java.net.URLClassLoader.findClass(URLClassLoader.java:205)

at java.lang.ClassLoader.loadClass(ClassLoader.java:323)

at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294)

at java.lang.ClassLoader.loadClass(ClassLoader.java:268)

Could not find the main class: io.druid.cli.Main. Program will exit.

Fix

Druid is developed in Java 1.7 and hence it requires 1.7 JRE.

Steps on Ubuntu

java -version

sudo add-apt-repository ppa:webupd8team/java

sudo apt-get install oracle-java7-installer

sudo apt-get install oracle-java7-set-default

java -version

[Deepak Jain]

Correction

 java -version

 sudo add-apt-repository ppa:webupd8team/java

 sudo apt-get update

 sudo apt-get install oracle-java7-installer

 sudo apt-get install oracle-java7-set-default

 java -version

 

[Fangjin Yang]

Hi Deepak, yeah, Druid 0.6.x requires Java 7.