Try something else

Author: ViktorHofer

src/SignalR/clients/java/signalr/build.gradle

@@ -14,12 +14,6 @@ plugins {
     id 'maven-publish'
 }
 
-java {
-    toolchain {
-        languageVersion = JavaLanguageVersion.of(17)
-    }
-}
-
 allprojects {
     apply plugin: "java-library"
     apply plugin: "com.diffplug.spotless"
@@ -28,7 +22,7 @@ allprojects {
     version project.findProperty('packageVersion') ?: "99.99.99-dev"
 
     java {
-        sourceCompatibility = 1.8
+        sourceCompatibility = 1.9
     }
 
     repositories {

src/SignalR/clients/java/signalr/core/build.gradle

@@ -6,9 +6,6 @@ plugins {
 group 'com.microsoft.signalr'
 
 java {
-    toolchain {
-        languageVersion = JavaLanguageVersion.of(17)
-    }
     withJavadocJar()
     withSourcesJar()
 }

src/SignalR/clients/java/signalr/messagepack/build.gradle

@@ -7,9 +7,6 @@ group 'com.microsoft.signalr.messagepack'
 
 java
 {
-    toolchain {
-        languageVersion = JavaLanguageVersion.of(17)
-    }
     withJavadocJar()
     withSourcesJar()
 }

src/SignalR/clients/java/signalr/test/build.gradle

@@ -2,12 +2,6 @@ plugins {
     id 'java'
 }
 
-java {
-    toolchain {
-        languageVersion = JavaLanguageVersion.of(17)
-    }
-}
-
 configurations {
     antJUnit
 }