Elasticsearch Start up Problem

Elastic Stack Elasticsearch
1

Hi, I recently installed Elasticsearch on my server - while starting I'm getting below exception:

Exception in thread "main" java.lang.UnsupportedClassVersionError: org/elasticsearch/bootstrap/Elasticsearch : Unsupported major.minor version 51.0

I've setup JDK1.8 and done everything required:

java -version
java version "1.8.0_60"
Java(TM) SE Runtime Environment (build 1.8.0_60-b27)
Java HotSpot(TM) 64-Bit Server VM (build 25.60-b23, mixed mode)

echo $JAVA_HOME
/u01/apps/java/jdk1.8.0_60

Appreciate your help to resolve this issue please.

Thanks,
Ariv

2

Hello Arivazhagan,

Version 51.0 is java 7. So, this would happen if you are trying to run ES with java 6. Maybe you have a java 6 installation? If this is the case, then the elasticsearch startup script is picking up that version somehow...

Cheers

3

Hi Thiago, Thanks for your response.

I do have 3 versions Java 6, 7 and 8. I've set my JAVA_HOME to point to Java8, guess I have to try removing other two versions of the Java.

Again, does ES still run with Java 7???

Thanks

4

Hi Arivazhagan,

Yes, elasticsearch requires java 1.7u55+. Please, check the support matrix for more information https://www.elastic.co/support/matrix

Cheers

5

Hi,

I've moved the other Java installations but still i'm getting the above error.. :frowning:

6

Hello,

Did you "moved" or did you "removed"?

What is your OS? How did you installed ES?

Cheers

7

I moved to other location, but still the JAVA_HOME is pointing to JDK1.8

OS Version: 2.6.32-100.34.1.el6uek.x86_64 GNU/Linux

I downloaded ES latest version and unzipped and ran /bin/elasticsearch..

Even I created another thread for installation issue: ES Installation Problem

From my browser I tried launch: http://IP:9200 - is not working

By the way - I don't see any definitive guide installing ES on Linux, could you share if you have any (in fact I have to install full ELK stack)

8

There are several ways of installing/running ES in Linux.

If you want a more standard way, try using repositories: https://www.elastic.co/guide/en/elasticsearch/reference/current/setup-repositories.html

Cheers

9

Thanks for spending time to reply my queries.

This the latest when I tried to install it again:

Package elasticsearch-1.3.9-1.noarch already installed and latest version
Nothing to do
[xxxxx@xxxxxxxx~]$ sudo service elasticsearch restart
[sudo] password for ecomm:
Stopping elasticsearch: [FAILED]
Starting elasticsearch: [ OK ]
[xxxxx@xxxxxxxx~]$ Exception in thread "main" java.lang.UnsupportedClassVersionError: org/elasticsearch/bootstrap/Elasticsearch : Unsupported major.minor version 51.0
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:634)
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$1.run(URLClassLoader.java:212)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:205)
at java.lang.ClassLoader.loadClass(ClassLoader.java:321)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294)
at java.lang.ClassLoader.loadClass(ClassLoader.java:266)
Could not find the main class: org.elasticsearch.bootstrap.Elasticsearch. Program will exit.

10

Run the following and paste the output here:

which java

11

/u01/apps/java/jdk1.8.0_60/bin/java

12

That's the correct one.

You could add the following to /etc/default/elasticsearch:

JAVA_HOME=/u01/apps/java/jdk1.8.0_60

If does not works, then one last shot is setting the above line as the first line in /etc/init.d/elasticsearch.

If even that does not works, then something else is causing elasticsearch init scripts to select the java 6 installation somehow.

Cheers

13

No luck, have tried all the step.

Do you suggest to "completely remove" other JDK versions and do a fresh ES installation?

14

Either that or maybe docker, are you familiar with docker?

15

Sorry, not heard about it..

16

See if you can follow this https://docs.docker.com/engine/installation/linux/oracle/

Then, if you can successfully install docker, then run elasticsearch with the following:

docker run -d --net host elasticsearch

18

Ok - will check and let you know. Thanks again