Why Doesn't My Java BufferedWriter Write All the Data?

BufferedWriter Not Fully Outputting Data

In Java, the BufferedWriter class is commonly used to write text to disk. While it employs buffering techniques to improve performance, there are instances where it may fail to write all of the intended data to the output file.

One such instance occurs when the BufferedWriter buffer exceeds its default size. By default, the buffer size is set to 8192 characters, which can easily accommodate hundreds of lines of data. However, if the amount of data exceeds the buffer capacity, the data will not be written to the file until the buffer has been flushed explicitly.

Issue Description

The program described in the question reads data from a CSV file and converts it into SQL commands for insertion into a table. The program seems to function correctly until it suddenly stops writing to the output file halfway through the conversion process.

Solution

To remedy this issue, it is crucial to close the OutputStream associated with the BufferedWriter. This action forces the flushing of the remaining data, ensuring that it is written to the output file. The following line of code should be added before the program terminates:

out.close();

By closing the OutputStream, the buffered data is immediately written to the file, resolving the issue of truncated output.

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