Java error : read timed out

recently, every time I run play the code I wrote, at the end I get this error in the console,
and it keep showing every few seconds…

Why is that?

I’m working with processing 4.0b2

java.net.SocketTimeoutException: Read timed out
at java.base/java.net.SocketInputStream.socketRead0(Native Method)
at java.base/java.net.SocketInputStream.socketRead(SocketInputStream.java:115)
at java.base/java.net.SocketInputStream.read(SocketInputStream.java:168)
at java.base/java.net.SocketInputStream.read(SocketInputStream.java:140)
at java.base/java.io.BufferedInputStream.fill(BufferedInputStream.java:252)
at java.base/java.io.BufferedInputStream.read1(BufferedInputStream.java:292)
at java.base/java.io.BufferedInputStream.read(BufferedInputStream.java:351)
at processing.app.WebServer$Worker.handleClient(WebServer.java:148)
at processing.app.WebServer$Worker.run(WebServer.java:111)
at java.base/java.lang.Thread.run(Thread.java:829)