com.mysql.jdbc.PacketTooBigException when using REST Task

Issue

When out of the box REST Task receives response from the service which is too large, the BPM will throw following exception:

Caused by: com.mysql.jdbc.PacketTooBigException: Packet for query is too large (5600841 > 1048576). You can change this value on the server by setting the max_allowed_packet' variable.
    at com.mysql.jdbc.MysqlIO.send(MysqlIO.java:3865) [mysql-connector-java-5.1.25.jar:]
    at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2551) [mysql-connector-java-5.1.25.jar:]
    at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2731) [mysql-connector-java-5.1.25.jar:]
    at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2815) [mysql-connector-java-5.1.25.jar:]
    at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:2155) [mysql-connector-java-5.1.25.jar:]
    at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2458) [mysql-connector-java-5.1.25.jar:]
    at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2375) [mysql-connector-java-5.1.25.jar:]
    at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2359) [mysql-connector-java-5.1.25.jar:]
    at org.jboss.jca.adapters.jdbc.WrappedPreparedStatement.executeUpdate(WrappedPreparedStatement.java:493)
    at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.executeUpdate(ResultSetReturnImpl.java:186) [hibernate-core-4.2.18.Final-redhat-2.jar:4.2.18.Final-redhat-2]
    ... 173 more