Cannot compile in Java1.6 environment

[ylinLOY]

Requirement - what kind of business use case are you trying to solve?

use for POC test instrument Java application

Problem - what in Jaeger blocks you from solving the requirement?

failed to compile in source code in Java 1.6 env
]# ./gradlew

FAILURE: Build failed with an exception.

• What went wrong:
  Gradle 5.4.1 requires Java 8 or later to run. You are currently using Java 6.

• Try:
  Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

• Get more help at https://help.gradle.org
  jaeger-client-java]# echo $JAVA_HOME
  /data/java/current/jre

jaeger-client-java]# $JAVA_HOME/bin/java -version
java version "1.6.0_211"
Java(TM) SE Runtime Environment (build 1.6.0_211-b11)
Java HotSpot(TM) 64-Bit Server VM (build 20.211-b11, mixed mode)

Proposal - what do you suggest to solve the problem or improve the existing situation?

Any open questions to address

[yurishkuro]

The plan was to drop Java 6 support #511.

[ylinLOY]

Is Java 7 still supported?
Thanks.

[yurishkuro]

The artifacts are still targeted at 1.6. We don't need to be able to compile with 1.6 in order to support 1.6 at runtime.

jaeger-client-java/build.gradle

Lines 70 to 73 in d444df2

	compileJava {
	sourceCompatibility = 1.6
	targetCompatibility = 1.6
	}