Error: when connecting to sqlServer2005 java.lang.ClassNotFoundException:

Question

Hi SDN,
I am trying to connect to sqlServer2005 using the following code
try{
Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
Connection con = java.sql.DriverManager.getConnection("jdbc:sqlserver://obtdev15:1433;DatabaseName=O50");
response.write("connection succeded<br>");
Statement st=  con.createStatement();
response.write("statement created<br>");
ResultSet c = st.executeQuery("select * from [SAPO50DB].[OGP_PROJECT]");
response.write(" rows selected-->" + c.getString("PROJECTNAME"));
}catch(Exception e){
              e.printStackTrace();
              response.write("exception in --"+e);
when i execute it, it throws the following exception
<b>java.lang.ClassNotFoundException: com.microsoft.sqlserver.jdbc.SQLServerDriver Found in negative cache -
Loader Info -
ClassLoader name: [com.sapportals.portal.prt.util.ApplicationClassLoader@b460e20] Parent loader name: [com.sapportals.portal.prt.util.AutoClassLoader@a52a72a] References: not registered! Resources: F:\usr\sap\O50\DVEBMGS50\j2ee\cluster\server0\apps\sap.com\irj\servlet_jsp\irj\root\WEB-INF\portal\portalapps\ConnectingtoDB\lib\api.jar -
</b>
Please suggest me to rectify the above error.
your help will be awarded.
Thanks in Advance.
Regards
Basha

Answer 1

Hi Basha,
basically, your application is missing a java class. However, the proper way to connect to a database is discussed in this <a href="https://www.sdn.sap.com/irj/sdn/thread?threadID=86307">thread</a>.
Follow Detlev's advise:
<i>In general, using a J2EE server means that you have a DB connection pool at hand where you can attach your database and then retrieve the Datasource object from the JNDI. That way, you won't have to care about connection pooling etc, and using tools like oject-relational-mappers also is quite easy, for they also expect just the Datasource or even better the JNDI lookup name.</i>
You will find detailed information in the<a href="http://help.sap.com/saphelp_nw04/helpdata/de/bb/69da54d8aedc419d46d9ea074e4d41/frameset.htm">SAP Library</a>.
Best regards,
Martin