i have problem with java and Heidisql

i want to create a simple login webpage using jsp
But when i run the webpage i have this error but i can not fix plz help me:
these are my error:
1. org.apache.jasper.JasperException: javax.servlet.ServletException: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Unknown database 'abc/sample/usermaster'
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:491)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:401)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)

javax.servlet.ServletException: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Unknown database 'abc/sample/usermaster'
org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:862)
org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:791)
org.apache.jsp.doLogin_jsp._jspService(doLogin_jsp.java:126)

This is not a problem with HeidiSQL is it?

If you want to code DB-driven apps in Java you must learn two basic things:

1. To read exception messages. They are there for a reason: to tell you what the error was and provide hints about how to fix it.

2. To identify the different technologies you are using.

Said that, abc/sample/usermaster is not a valid database name in MySQL. Have you even installed MySQL Server in your computer?

Hello all,I am new to this forum and I would like to ask that what are the benefits of sql training, what all topics should be covered and it is kinda bothering me ... and has anyone studies from this course wiziq.com/course/125-comprehensive-introduction-to-sql of SQL tutorial online?? or tell me any other guidance...
would really appreciate help... and Also i would like to thank for all the information you are providing on sql.