public void setMaxConnections(Integer maxConnections) {
        this.maxConnections = maxConnections;
    }
Sets the maximum number of connections that can be established to this
connection concurrently.

@param maxConnections
    The maximum number of connections that can be established to this
    connection concurrently, zero if no restriction applies, or null if
    the default restrictions should be applied.
extensions/guacamole-auth-jdbc/modules/guacamole-auth-jdbc-base/src/main/java/org/apache/guacamole/auth/jdbc/connection/ConnectionModel.java