The remote host forcibly closed an existing connection.

exception caught on transport layer [[id: 0xc7fbf08e, /127.0.0.1:55381 => /127.0.0.1:9001]], closing connection
java.io.IOException: An existing connection was forcibly closed by the remote host.

 

When sonarQube started, I thought that the firewall was not closed. Later, it was found that the database tables of the version 5.2 to 6.2 were different, and the library must be rebuilt.

 

CREATE DATABASE sonar CHARACTER SET utf8 COLLATE utf8_general_ci;

   A comparison of the two versions.