Migrate JMeter to Java 17 for next major release

[milamberspace]

Use case

Next major version (6.0) will require Java 17 or superior

To do:

• Migrate the Java 8 source code to Java 17
  • [ ] https://github.com/apache/jmeter/pull/6220
  • Pattern Matching for instanceof uses (Java 14/16?)
  • Implicit Typing with var (Java 10)
  • Using Switch Expressions / yield Keyword (Java 14)
  • Using Text Blocks (Java 15)
  • Ref. https://reflectoring.io/java-release-notes/
• Opportunity to use the next API HTTP Client from Java 11?
• Check the dependencies for Java 17 (update or removal)
• Update the scripts (.sh/.bat) to check Java version before start JMeter
• Update Java argline params
• Upgrade build process (already done)

Possible solution

No response

Possible workarounds

No response

JMeter Version

6.0

Java Version

Java 17+

OS Version

No response

[linvaux]

Have you considered building JMeter with JDK21 and using virtual threads to improve performance?