First make sure that these jar files are imported in your libraries. If not then import these files from jar files folder ==>

mysql-connector-java-5.1.34-bin.j ucanaccess-2.0.9.3.jar jackcess-2.0.8.jar hsqldb.jar commons-logging-1.1.1.jar commons-lang-2.6.jar

Navigate to DBLink.java file. Enter your username and root password in getconnection function. Compile DBLink.java and run.