Solr - 如何从DataImportHandler接收失败导入的通知？

<entity name="example" query="SELECT * FROM example_table">
  <field column="id" name="id" />
  <field column="name" name="name" />
</entity>

<requestHandler name="/dataimport" class="solr.DataImportHandler">
  <lst name="defaults">
    <str name="config">data-config.xml</str>
    <str name="onError">continue</str>
    <str name="logFile">dataimport.log</str>
  </lst>
</requestHandler>

import org.apache.solr.handler.dataimport.DocBuilder;

public class MyDocBuilder extends DocBuilder {
  @Override
  public void onError(Throwable t) {
    // 处理导入失败的通知
    System.out.println("导入失败：" + t.getMessage());
  }
}

<requestHandler name="/dataimport" class="solr.DataImportHandler">
  <lst name="defaults">
    <str name="config">data-config.xml</str>
    <str name="onError">myHandler</str>
  </lst>
  <lst name="last-components">
    <str>myHandler</str>
  </lst>
</requestHandler>

<searchComponent name="myHandler" class="com.example.MyDocBuilder" />