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[news.eclipse.birt.usability] error data fetching from mysql

I designed a BIRT report and create databset for mysql5.0. I copied the jconnector in $cataline_home\conf\lib and set in the classpath.
When I designed the report data is showing but when I run on the tomcat server it display errors as follows :


WARNING: Unable to find required classes (javax.activation.DataHandler and javax.mail.internet.MimeMultipart). Attachment support is disabled.
Apr 6, 2008 5:07:47 PM org.eclipse.birt.report.data.oda.jdbc.JDBCDriverManager findDriver
WARNING: Failed to load JDBC driver class: com.mysql.jdbc.Driver
Apr 6, 2008 5:07:47 PM org.eclipse.birt.data.engine.odaconsumer.ConnectionManager openConnection
SEVERE: Cannot open connection.
org.eclipse.birt.report.data.oda.jdbc.JDBCException: Cannot load JDBC Driver class: com.mysql.jdbc.Driver at org.eclipse.birt.report.data.oda.jdbc.JDBCDriverManager.findDriver(JDBCDriverManager.java:623)
at org.eclipse.birt.report.data.oda.jdbc.JDBCDriverManager.loadAndRegisterDriver(JDBCDriverManager.java:731)
at org.eclipse.birt.report.data.oda.jdbc.JDBCDriverManager.doConnect(JDBCDriverManager.java:192)
at org.eclipse.birt.report.data.oda.jdbc.JDBCDriverManager.getConnection(JDBCDriverManager.java:158)
.............
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Please help me.