Use Error Prone 2.32.0

build.gradle

@@ -20,16 +20,18 @@ repositories {
   maven { url 'https://oss.sonatype.org/content/repositories/snapshots/' }
 }
 
-ext.errorproneVersion = '2.32.0'
+ext {
+  errorproneVersion = '2.32.0'
+  isJava17orHigher = JavaVersion.current() >= JavaVersion.VERSION_17
+  isJava21orHigher = JavaVersion.current() >= JavaVersion.VERSION_21
+}
 
 dependencies {
   implementation 'io.github.classgraph:classgraph:4.8.175'
   implementation 'org.apache.commons:commons-lang3:3.17.0'
   implementation 'org.apache.commons:commons-text:1.12.0'
   implementation 'org.plumelib:reflection-util:1.1.3'
 
-  compileOnly "com.google.errorprone:error_prone_annotations:${errorproneVersion}"
-
   testImplementation 'org.junit.jupiter:junit-jupiter-api:5.11.0'
   testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine'
 }
@@ -82,7 +84,7 @@ spotless {
 // Error Prone linter
 
 dependencies {
-  errorprone('com.google.errorprone:error_prone_core:2.31.0')
+  errorprone("com.google.errorprone:error_prone_core:${errorproneVersion}")
 }
 tasks.withType(JavaCompile).configureEach {
   // "-processing" avoids javac warning "No processor claimed any of these annotations".
@@ -95,6 +97,7 @@ tasks.withType(JavaCompile).configureEach {
     disable('AnnotateFormatMethod') // Error Prone doesn't know about Checker Framework @FormatMethod
     disable('UseCorrectAssertInTests') // https://github.com/typetools/checker-framework/issues/3345
   }
+  options.errorprone.enabled = isJava17orHigher
 }
 
 // Checker Framework pluggable type-checking