求解！mysqlwriter 中方法注释程序仍然可以正常运行！

前提：txtfilereader -> mysqlwriter，保留核心包，其余reader、writer已删除
```
//MysqlWriter:78
public void startWrite(RecordReceiver recordReceiver) {
this.commonRdbmsWriterTask.startWrite(recordReceiver, this.writerSliceConfig,
super.getTaskPluginCollector());
}
```

```
//CommonRdbmsWriter:310
public void startWrite(RecordReceiver recordReceiver,
Configuration writerSliceConfig,
TaskPluginCollector taskPluginCollector) {
System.out.println("方法进入");
/*
Connection connection = DBUtil.getConnection(this.dataBaseType,
this.jdbcUrl, username, password);
DBUtil.dealWithSessionConfig(connection, writerSliceConfig,
this.dataBaseType, BASIC_MESSAGE);
startWriteWithConnection(recordReceiver, taskPluginCollector, connection);
*/
}
```
如图，整个方法内部调用注释了，打包后仍然可以正常运行，方法中的输出没有出现。

测试是否打包问题：第2个参数传null
```
//MysqlWriter:78
public void startWrite(RecordReceiver recordReceiver) {
this.commonRdbmsWriterTask.startWrite(recordReceiver, null,
super.getTaskPluginCollector());
}
```

```
//CommonRdbmsWriter:310
public void startWrite(RecordReceiver recordReceiver,
Configuration writerSliceConfig,
TaskPluginCollector taskPluginCollector) {
System.out.println("方法进入");
Connection connection = DBUtil.getConnection(this.dataBaseType,
this.jdbcUrl, username, password);
DBUtil.dealWithSessionConfig(connection, writerSliceConfig,
this.dataBaseType, BASIC_MESSAGE);
startWriteWithConnection(recordReceiver, taskPluginCollector, connection);
}
```
传入null参数，抛出空指针异常，排除打包缓存等问题。并且输出依然没有出现在控制台。

Start by reviewing the MysqlWriter and CommonRdbmsWriter startWrite methods around the lines cited in the issue. Reproduce the txtfilereader-to-mysqlwriter case with the core package only, then compare the executed packaged code with the source and the null-argument test. Done means identifying why the observed method body is not reached and documenting or correcting that behavior.

Written by the indexing model from the issue text.