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java.sql.SQLException: Cannot load JDBC driver class 'oracle.jdbc.OracleDriver'

We have deployed our application on tomcat server.
Java version - 1.8
Sometime our application is impacted with the error :
SEVERE [main] org.apache.catalina.mbeans.GlobalResourcesLifecycleListener.createMBeans Exception processing Global JNDI Resources
javax.naming.NamingException: Unexpected exception resolving reference [Root exception is java.sql.SQLException: Cannot load JDBC driver class 'oracle.jdbc.OracleDriver']
But whenever we restart the server, it will resolved.
We get this issue once in two days.
Any help in this is appreciated .

Pentaho SQL (Native) connection error

I'm running a couple of SQL connections from a Job. They are all working with the sqljdbc4.jar, but when I run them with MS SQL Server Native (which was by default) instead of MS SQL Server - they fail with this error:
Error connecting to database [xxx_zxxxx] : org.pentaho.di.core.exception.KettleDatabaseException:
Error occured while trying to connect to the database
Error connecting to database: (using class com.microsoft.sqlserver.jdbc.SQLServerDriver)
Java Runtime Environment (JRE) version 1.7 is not supported by this driver. Use the sqljdbc4.jar class library, which provides support for JDBC 4.0.
org.pentaho.di.core.exception.KettleDatabaseException:
Error occured while trying to connect to the database
at org.pentaho.di.core.database.Database.normalConnect(Database.java:427)
at org.pentaho.di.core.database.Database.connect(Database.java:361)
.................
Caused by: org.pentaho.di.core.exception.KettleDatabaseException:
Can this be caused by the new JDK_1.8 I've installed? How to resolve this issue?
Thank you.

I found a work-around solution that worked just fine in my case. Just remove the sqljdbc.jar and leave only sqljdbc4.jar in my file system. Also added only sqljdbc4.jar to the System variables > path

Error with jdbc mysql connections with jasper server

I am using jasper server CP 5.0.0. I have configured the data source properties like this
Set Data Source Type and Properties
Driver (required):com.mysql.jdbc.Driver
URL (required):jdbc:mysql://localhost:3306/jasperserver
The connection is failed when clicked on test connection
When I am running the report I am getting a error
Error Message
com.jaspersoft.jasperserver.api.JSExceptionWrapper: com.mysql.jdbc.Driver
Error Message
java.lang.ClassNotFoundException: com.mysql.jdbc.Driver
Error Trace
java.lang.ClassNotFoundException: com.mysql.jdbc.Driver at
I have been searching this for a long time with no success.

You should add mysql drivers jar file to the build path of your project.

Exception in hibernate sample program

I'm trying a sample hibernate program, to connect to MS SQL DB and execute some sql.
I've created hbm and cfg.xml files but while executing I'm getting following exception.
java.sql.SQLException: No suitable driver
at java.sql.DriverManager.getConnection(DriverManager.java:545)
at java.sql.DriverManager.getConnection(DriverManager.java:140)
at org.hibernate.connection.DriverManagerConnectionProvider.getConnection(DriverManagerConnectionProvider.java:133)
at org.hibernate.cfg.SettingsFactory.buildSettings(SettingsFactory.java:111)
at org.hibernate.cfg.Configuration.buildSettings(Configuration.java:2101)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1325)
at com.persistent.demo.HibernateUtil.<clinit>(HibernateUtil.java:12)
at com.persistent.demo.HelloWorld.main(HelloWorld.java:15)
Exception in thread "main" java.lang.ExceptionInInitializerError
at com.persistent.demo.HibernateUtil.<clinit>(HibernateUtil.java:14)
at com.persistent.demo.HelloWorld.main(HelloWorld.java:15)
Caused by: org.hibernate.HibernateException: Dialect class not found: net.sf.hibernate.dialect.SQLServerDialect
I'm not getting whether I have missed any jar files or is there any other problem.
Please help.
Thanks.
-Uday

Dialect class not found: net.sf.hibernate.dialect.SQLServerDialect
You need to put the Jar, containing this class, in your class paht.
May the problem is, that the dialect you need is: org.hibernate.dialect.SQLServerDialect which is aviable in the hibernate core jar.

have you add Mssqlserver.jar in your class path . or check your connection url

JDBC Driver class not found in Hibernate program

I am making a simple mapping program in hibernate.
I am facing an error:
JDBC Driver class not found: com.mysql.jdbc.Driver
java.lang.ClassNotFoundException: com.mysql.jdbc.Driver
It gives an error on this line:
Session session = HibernateUtil.getSessionFactory().openSession();
hibernate.cfg.xml is correct. In the same configration other program are run. but this program give me error.
What is the reason that it throws this error?

You need to get a MySQL driver and put it on your classpath.
A commonly-used driver is MySQL Connector/J. It can be found here. Extract the package and make the jar available to your application.