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

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 5.3, 5.4, 6.0
• Fix Version/s: 6.3, 7.0
• Component/s: scripts and tools
• Assignee: Jan Høydahl
• Reporter: Steven Rowe
• Created: 21/Sep/15 17:33
• Updated: 13/Dec/16 18:11
• Resolved: 20/Sep/16 09:14

Description

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:

$ 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

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:

$ 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!

From server/logs/solr.log:

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

Issue Links

• breaks: SOLR-9862 Cannot start Solr on Solaris/Super Cluster