[jira] [Created] (SOLR-8080) 'bin/solr start' should print informative errors when the JVM version is insufficient

["Steve Rowe (JIRA)" <ji...@apache.org>]

Steve Rowe created SOLR-8080:
--------------------------------

             Summary: 'bin/solr start' should print informative errors when the JVM version is insufficient
                 Key: SOLR-8080
                 URL: https://issues.apache.org/jira/browse/SOLR-8080
             Project: Solr
          Issue Type: Bug
          Components: scripts and tools
    Affects Versions: 5.3, Trunk, 5.4
            Reporter: Steve Rowe
            Priority: Minor


>From the unpacked 5.3.0 distribution, with Java6 set in {{$JAVA_HOME}} and the {{$PATH}}, there is some indication that there is a problem (Java7 is minimum supported JVM version) - bin/solr times out waiting for Solr to start up - but no info is printed about what the problem might be:

{noformat}
$ echo $JAVA_HOME
/System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home

$ java -version
java version "1.6.0_65"
Java(TM) SE Runtime Environment (build 1.6.0_65-b14-466.1-11M4716)
Java HotSpot(TM) 64-Bit Server VM (build 20.65-b04-466.1, mixed mode)

$ bin/solr start
Waiting up to 30 seconds to see Solr running on port 8983 [\]  Still not seeing Solr listening on 8983 after 30 seconds!
tail:~/temp/solr-5.3.0/server/logs/solr.log: No such file or directory
{noformat}

On trunk (built via {{ant server}} with Java8), the situation is worse - although Solr started, it's not in a usable state, and there is no indication given that there is a problem:

{noformat}
$ java -version
java version "1.7.0_71"
Java(TM) SE Runtime Environment (build 1.7.0_71-b14)
Java HotSpot(TM) 64-Bit Server VM (build 24.71-b01, mixed mode)

$ echo $JAVA_HOME
/Library/Java/JavaVirtualMachines/jdk1.7.0_71.jdk/Contents/Home

sarowe@smb [2048]$ bin/solr start
Waiting up to 30 seconds to see Solr running on port 8983 [/]  
Started Solr server on port 8983 (pid=50551). Happy searching!
{noformat}

>From {{server/logs/solr.log}}:

{noformat}
2015-09-21 17:15:28.991 WARN  (main) [   ] o.e.j.u.c.AbstractLifeCycle FAILED So
lrRequestFilter: java.lang.UnsupportedClassVersionError: org/apache/solr/servlet
/SolrDispatchFilter : Unsupported major.minor version 52.0
java.lang.UnsupportedClassVersionError: org/apache/solr/servlet/SolrDispatchFilt
er : 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:14
2)
        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)

[...]

2015-09-21 17:15:29.020 INFO  (main) [   ] o.e.j.s.ServerConnector Started ServerConnector@24d25ddc{HTTP/1.1}{0.0.0.0:8983}
2015-09-21 17:15:29.020 INFO  (main) [   ] o.e.j.s.Server Started @1237ms
{noformat}



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