java - strange messages in log file @^@^@^@^@^@^@^@^@^@^@^@^@^@^@^ -

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I have an application server for network operation written with Java based on Apache Meena. Recently, in my log files, I have to face a strange behavior I noticed that the log file @ ^ @ ^ @ ^ @ ^ @ ^ @ the @ @ @ @ @ @ @ @ @ @ @ @ @ @ i mean that the unpredictable characters There is a huge amount because the log file gets hundreds of GB in a few hours! I have no clue about this problem and it is almost impossible for Google to do what may be the reason?

Thanks in advance.

= "post-text" itemprop = "text">

those characters are (NUL, ASCII values ​​0).

Carat marking for control characters is zero characters ^ @


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