private static int getChunkSdkVersion(ModuleChunk chunk) {
    int chunkSdkVersion = -1;
    for (JpsModule module : chunk.getModules()) {
      final JpsSdk<JpsDummyElement> sdk = module.getSdk(JpsJavaSdkType.INSTANCE);
      if (sdk != null) {
        final int moduleSdkVersion = JpsJavaSdkType.getJavaVersion(sdk);
        if (moduleSdkVersion != 0 /*could determine the version*/ && (chunkSdkVersion < 0 || chunkSdkVersion > moduleSdkVersion)) {
          chunkSdkVersion = moduleSdkVersion;
        }
      }
    }
    return chunkSdkVersion;
  }
private static int getChunkSdkVersion(ModuleChunk chunk)