Cannot run solr (cannot open log file)

Question

Been trying to get solr running for a while now... finally seemed like I got it. Following this tutorial. Ran this command

bin/solr start

And saw this text

Waiting up to 30 seconds to see Solr running on port 8983

But then...

Still not seeing Solr listening on 8983 after 30 seconds!
tail: cannot open `/root/downloads/solr-6.0.0/server/logs/solr.log' for reading: No such file or directory

This is getting highly frustrating. I tried to run the bin command with sudo, still no luck. What am I doing wrong?

EDIT : I ran it in the foreground with

bin/solr start -f

and got this

Exception in thread "main" java.lang.UnsupportedClassVersionError: org/eclipse/jetty/start/Main : Unsupported major.minor version 52.0
    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:296)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:268)
    at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:406)

My java-foo is not up to par, so I have no idea what to make of this.

Answer 1

Had to update to java 1.8 This was useful

Answer 2

I faced the same issue. Make sure these are set

java -version

outputs

java version "1.8.0_77"
Java(TM) SE Runtime Environment (build 1.8.0_77-b03)
Java HotSpot(TM) 64-Bit Server VM (build 25.77-b03, mixed mode)

and

echo $JAVA_HOME

outputs

/usr/lib/jvm/java-8-oracle

Note: The minor version of java and java home path may change from system to system. But make sure they are of the same version(Java 8).

Please check your /var/solr/logs/solr_gc.log and see which version of java it has used to install/start solr. In my case, though these parameters were set, it was using java 7. So I uninstalled java 7 and started solr again. It started working

Waiting up to 30 seconds to see Solr running on port 8983 [/]
Started Solr server on port 8983 (pid=11983). Happy searching!