dweiss commented on a change in pull request #1950:
URL: https://github.com/apache/lucene-solr/pull/1950#discussion_r501473380



##########
File path: gradle/validation/spotless.gradle
##########
@@ -0,0 +1,31 @@
+
+def resources = scriptResources(buildscript)
+ 
+allprojects { prj ->
+  plugins.withType(JavaPlugin) {
+    prj.apply plugin: 'com.diffplug.spotless'
+
+    spotless {
+      java {
+        licenseHeaderFile file("${resources}/asl-header.txt"), '^(\\s*package)'
+        lineEndings 'UNIX'
+        endWithNewline()
+        googleJavaFormat('1.9')
+
+        // Known problematic files.
+        targetExclude "**/HTMLStripCharFilter.java", 
"**/UAX29URLEmailTokenizerImpl.java", 
+           "**/PatternParser.java", "**/BuildNavDataFiles.java", 
"**/CheckLinksAndAnchors.java",
+           "**/TestSubQueryTransformer.java"

Review comment:
       I was thinking the other way around, actually always apply formatting 
after they run so that you get the same code in the output after regenerating 
these source files. This should be idempotent and have clean formatting too.  
   
   I excluded these particular files because they break the formatter... Some 
of them have no package and others cause stack overflows - 
https://github.com/google/google-java-format/issues/528




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