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

@param maxConnections
    The maximum number of connections that can be established to this
    connection group 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/connectiongroup/ConnectionGroupModel.java