reload偶尔有几次抛出NullPointException

tools日志默认打在控制台找不回来了，抛异常在new File这里。我找不到运行期间有可能清空this.path的代码。

MetaConfig

@Override
public void reload() {
final File file = new File(this.path);

Start in MetaConfig.reload(), especially the new File(this.path) call, and investigate how this.path can become null during reload. Check the available tools logs and the reload path to reproduce the intermittent exception. Done means the cause is identified and reload no longer throws the reported NullPointException.

Written by the indexing model from the issue text.