[LUCENE-8154] TODO List when upgrading to Java 9 as minimum requirement

• Type: Task
• Status: Resolved
• Priority: Major
• Resolution: Implemented
• Labels: Java9
• Lucene Fields: New
• Assignee: Unassigned
• Reporter: Uwe Schindler
• Created: 04/Feb/18 09:36
• Updated: 28/Aug/22 15:25
• Resolved: 19/Apr/19 07:33

Description

This issue is just a placeholder to record stuff that needs to be done when we upgrade to Java 9 as minimum requirement for running Lucene/Solr:

• Remove FutureArrays and FutureObjects from source tree and change code to use Java 9 native methods. Disable MR-JAR building (maybe only disable so we can reuse at later stages)
• Remove Java 8 bytebuffer unmapping code

Final stuff:

• When upgrading to Java 9, don't delete the Java 9 specific stuff for Multi-Release testing from build files or smoke tester! Keep it alive, maybe migrate to later Java (e.g. LTS-Java)

Issue Links

• is superceded by: LUCENE-8738 Bump minimum Java version requirement to 11
• relates to: LUCENE-7966 build mr-jar and use some java 9 methods if available
• relates to: LUCENE-6989 Implement MMapDirectory unmapping for coming Java 9 changes