build: specify java toolchain

.gitignore

@@ -20,3 +20,6 @@
 !/settings.gradle
 !/build.gradle
 !/gradle.properties
+!/gradle
+!/gradle/wrapper
+!/gradle/wrapper/gradle-wrapper.properties

build.gradle

@@ -5,6 +5,8 @@ plugins {
 java {
     sourceCompatibility = JavaVersion.VERSION_11
     targetCompatibility = JavaVersion.VERSION_11
+
+    toolchain.languageVersion = JavaLanguageVersion.of(11)
 }
 
 jar {

gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,7 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.5-bin.zip
+networkTimeout=10000
+validateDistributionUrl=true
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists

settings.gradle

@@ -0,0 +1,3 @@
+plugins {
+    id 'org.gradle.toolchains.foojay-resolver-convention' version '0.7.0'
+}