src/jdk.compiler/share/classes/com/sun/tools/javac/processing/JavacFiler.java

*** 51,60 ****
--- 51,61 ----
  import static javax.tools.StandardLocation.CLASS_OUTPUT;
  
  import com.sun.tools.javac.code.Lint;
  import com.sun.tools.javac.code.Symbol.ClassSymbol;
  import com.sun.tools.javac.code.Symbol.ModuleSymbol;
+ import com.sun.tools.javac.code.Symbol.TypeSymbol;
  import com.sun.tools.javac.code.Symtab;
  import com.sun.tools.javac.comp.Modules;
  import com.sun.tools.javac.model.JavacElements;
  import com.sun.tools.javac.resources.CompilerProperties.Warnings;
  import com.sun.tools.javac.util.*;
*** 715,725 ****
          checkName(typename, allowUnnamedPackageInfo);
          ClassSymbol existing = elementUtils.getTypeElement(typename);
          boolean alreadySeen = aggregateGeneratedSourceNames.contains(Pair.of(mod, typename)) ||
                                aggregateGeneratedClassNames.contains(Pair.of(mod, typename)) ||
                                initialClassNames.contains(typename) ||
!                               (existing != null && initialInputs.contains(existing.sourcefile));
          if (alreadySeen) {
              if (lint)
                  log.warning(Warnings.ProcTypeRecreate(typename));
              throw new FilerException("Attempt to recreate a file for type " + typename);
          }
--- 716,726 ----
          checkName(typename, allowUnnamedPackageInfo);
          ClassSymbol existing = elementUtils.getTypeElement(typename);
          boolean alreadySeen = aggregateGeneratedSourceNames.contains(Pair.of(mod, typename)) ||
                                aggregateGeneratedClassNames.contains(Pair.of(mod, typename)) ||
                                initialClassNames.contains(typename) ||
!                               containedInInitialInputs(typename);                          
          if (alreadySeen) {
              if (lint)
                  log.warning(Warnings.ProcTypeRecreate(typename));
              throw new FilerException("Attempt to recreate a file for type " + typename);
          }
*** 729,738 ****
--- 730,755 ----
          if (!mod.isUnnamed() && !typename.contains(".")) {
              throw new FilerException("Attempt to create a type in unnamed package of a named module: " + typename);
          }
      }
  
+     private boolean containedInInitialInputs(String typename) {
+         // Name could be a type name or the name of a package-info file
+         JavaFileObject sourceFile = null;
+ 
+         ClassSymbol existingClass = elementUtils.getTypeElement(typename);
+         if (existingClass != null) {
+             sourceFile = existingClass.sourcefile;
+         } else if (typename.endsWith(".package-info")) {
+             String targetName = typename.substring(0, typename.length() - ".package-info".length());
+             PackageSymbol existingPackage = elementUtils.getPackageElement(targetName);
+             if (existingPackage != null)
+                 sourceFile = existingPackage.sourcefile;
+         }
+         return (sourceFile == null) ? false : initialInputs.contains(sourceFile);
+     }
+ 
      /**
       * Check to see if the file has already been opened; if so, throw
       * an exception, otherwise add it to the set of files.
       */
      private void checkFileReopening(FileObject fileObject, boolean forWriting) throws FilerException {