Why Isn't My BufferedWriter Writing All Data to the File, and How Do I Fix It?

BufferedWriter Not Fully Writing to Output File: Understanding the Issue and Solution

In Java, when creating a BufferedWriter to write data to an output file, it's important to understand the buffering mechanism to ensure complete data transmission. The BufferedWriter's internal buffer stores data before flushing it to the underlying output stream. This improves performance by reducing the number of write operations, but it can also lead to incomplete data if not closed properly.

In your case, your program appears to prematurely terminate while writing SQL statements to a file, resulting in missing data. This suggests that the BufferedWriter's buffer is not being fully flushed before the program finishes.

The solution lies in closing the BufferedWriter when you are done writing to it. This action triggers the flush() method, which empties the buffer and sends the remaining data to the underlying output stream. By adding the line:

out.close();

to the end of your code, you ensure that all the data you have written to the BufferedWriter is actually written to the output file.

Remember, closing the BufferedWriter also closes the underlying FileWriter, which in turn closes the OutputStream. By closing the BufferedWriter, you guarantee that all pending data is flushed and safely transmitted to the file. This eliminates the potential for data loss or truncation that may occur due to an unclosed BufferedWriter.

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