Unable to load jdbc driver eclipse

I get the following error while trying to load MySQL Driver: java.lang.ClassNotFoundException: com.mysql.jdbc.Driver at java.net.URLClassLoader$1.run(URLClassLoader.java:202) at java….

API service works every second request

I have problem with jax-rs REST service. Service does not operate properly. Every second request service throw me exception: HTTP Status 500 – could not execute query type Exception report message …