The org.openapi.generator requires JDK 11 to generate the sources. Generated code still works with Java 8.

Relates to OpenAPITools/openapi-generator#15553

Author: gesellix

.github/workflows/cd.yml

@@ -23,7 +23,7 @@ jobs:
         #          - windows-latest
         #          - macos-latest
         java:
-          - 8
+          - 11
     #          - 17
     runs-on: ${{ matrix.os }}
     timeout-minutes: 20

.github/workflows/ci.yml

@@ -24,7 +24,7 @@ jobs:
           - windows-latest
           - macos-latest
         java:
-          - 8
+          - 11
           - 17
     runs-on: ${{ matrix.os }}
     timeout-minutes: 20

.github/workflows/release.yml

@@ -25,7 +25,7 @@ jobs:
         #          - windows-latest
         #          - macos-latest
         java:
-          - 8
+          - 11
     #          - 17
     runs-on: ${{ matrix.os }}
     timeout-minutes: 20

api-model-v1-41/build.gradle.kts

@@ -128,7 +128,11 @@ dependencies {
 
 java {
     toolchain {
-        languageVersion.set(JavaLanguageVersion.of(8))
+        // The org.openapi.generator requires JDK 11 to generate the sources.
+        // Generated code still works with Java 8.
+        // See below where we use Java 8 to perform checks
+        // See https://github.com/OpenAPITools/openapi-generator/pull/15553 for details.
+        languageVersion.set(JavaLanguageVersion.of(11))
     }
 }
 
@@ -138,6 +142,14 @@ tasks {
     }
     withType<Test> {
         useJUnitPlatform()
+
+        java {
+            toolchain {
+                // See above: the org.openapi.generator requires JDK 11 to generate the sources.
+                // We're trying to ensure that the generated code still works with Java 8.
+                languageVersion.set(JavaLanguageVersion.of(8))
+            }
+        }
     }
 }