private void validateEncoding(ModuleChunk chunk, String chunkPresentableName) {
   final CompilerEncodingService es = CompilerEncodingService.getInstance(myProject);
   Charset charset = null;
   for (Module module : chunk.getModules()) {
     final Charset moduleCharset = es.getPreferredModuleEncoding(module);
     if (charset == null) {
       charset = moduleCharset;
     } else {
       if (!Comparing.equal(charset, moduleCharset)) {
         // warn user
         final Charset chunkEncoding = CompilerEncodingService.getPreferredModuleEncoding(chunk);
         final StringBuilder message = new StringBuilder();
         message.append("Modules in chunk [");
         message.append(chunkPresentableName);
         message.append("] configured to use different encodings.\n");
         if (chunkEncoding != null) {
           message
               .append("\"")
               .append(chunkEncoding.name())
               .append("\" encoding will be used to compile the chunk");
         } else {
           message.append("Default compiler encoding will be used to compile the chunk");
         }
         myCompileContext.addMessage(
             CompilerMessageCategory.INFORMATION, message.toString(), null, -1, -1);
         break;
       }
     }
   }
 }
 private boolean isJDKChanged(final Sdk newJDK) {
   if (mySdk == null && newJDK == null) return false;
   return mySdk == null
       || newJDK == null
       || !Comparing.equal(mySdk.getVersionString(), newJDK.getVersionString());
 }