Unsupported major.minor version 51.0

[jakubzak88]

jruby-kafka git:(master) ✗ gem install jruby-kafka -v '1.4.0'
jar dependencies for jruby-kafka-1.4.0-java.gemspec . . .
Exception in thread "main" java.lang.UnsupportedClassVersionError: org/apache/maven/cli/MavenCli : Unsupported major.minor version 51.0
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClassCond(ClassLoader.java:637)
at java.lang.ClassLoader.defineClass(ClassLoader.java:621)
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 org.codehaus.plexus.classworlds.realm.ClassRealm.loadClassFromSelf(ClassRealm.java:401)
at org.codehaus.plexus.classworlds.strategy.SelfFirstStrategy.loadClass(SelfFirstStrategy.java:42)
at org.codehaus.plexus.classworlds.realm.ClassRealm.unsynchronizedLoadClass(ClassRealm.java:271)
at org.codehaus.plexus.classworlds.realm.ClassRealm.loadClass(ClassRealm.java:254)
at org.codehaus.plexus.classworlds.realm.ClassRealm.loadClass(ClassRealm.java:239)
at org.codehaus.plexus.classworlds.launcher.Launcher.getMainClass(Launcher.java:144)
at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:266)
at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:229)
at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:415)
at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:356)
ERROR: While executing gem ... (Errno::ENOENT)
No such file or directory - /Users/jza01/.rvm/gems/jruby-1.7.19/gems/jruby-kafka-1.4.0-java/deps.lst

[debaghtk]

I too am facing this error :/

[jakubzak88]

Execute this and send me print out:

/usr/libexec/java_home

[debaghtk]

/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home

[jakubzak88]

First of all you need to install latest jdk.

http://www.oracle.com/technetwork/java/javase/downloads/index.html

Then set your env variable to:

export JAVA_HOME = "/Library/Java/JavaVirtualMachines/jdk1.8.0_51.jdk/Contents/Home"

Then when you run:

java -version

You should see something like this:

java version "1.8.0_51"
Java(TM) SE Runtime Environment (build 1.8.0_51-b16)
Java HotSpot(TM) 64-Bit Server VM (build 25.51-b03, mixed mode)

If all this is set give it a go again and let me know if it helped.

[jakubzak88]

Also I would recommend to take a look at these, also very helpful Kafka gems:

https://github.com/bpot/poseidon
https://github.com/mthssdrbrg/heller

And for best support of all functionality I would personally go with JS node module:

https://github.com/SOHU-Co/kafka-node

Node module provided best error handling, speed and covers most of the Kafka features.

[debaghtk]

Hey thanks @jukeboxino your solution is spot on :)

[jakubzak88]

Happy to help ;)

[joekiller]

@jukeboxino is spot on. Use java 8