[SOLR-12141] Solr does not start on Windows and Linux/Mac with Java 10 or later

• Type: Bug
• Status: Closed
• Priority: Blocker
• Resolution: Fixed
• Affects Version/s: 7.0, 7.1, 7.2, 7.3
• Fix Version/s: 7.3
• Component/s: scripts and tools

Environment

Windows 10 with Java 10+

• Assignee: Uwe Schindler
• Reporter: Uwe Schindler
• Created: 26/Mar/18 18:42
• Updated: 08/Jun/19 15:16
• Resolved: 27/Mar/18 20:52

Description

If you try to start Solr on Windows with Java 10, it fails with the following message:

C:\Users\Uwe Schindler\Desktop\solr-7.3.0\bin>solr start -e techproducts

ERROR: Java 1.8 or later is required to run Solr. Current Java version is: 10

Java 8 and Java 9 works. I did not try Linux, but the version parsing on Windows is so braindead (i tried to fix it for Java 9 already). Windows CMD shell does not know any numerical comparisons, so it fails as "10" is alphabetically smaller "9".

I hope this is better on Linux.

Why do we have the version check at all? Wouldn't it be better to simply wait for a useful message by the Java VM on startup because of wrong class file format? This is too simply to break, especially as the output of "java -version" is not standardized (and changes with Java 10 to also have a date code,...). It also may contain "openjdk" instead of "java".

So please please, let's get rid of the version check!