How to connect postgres database with Grails 2.3.4

I'm new to Grails. I'm trying to connect postgresql 9.0 database server with grails 2.3.4. I have added postgresql-9.0-801.jdbc3.jar file into the lib folder of grails application.When i'm running the application on Intellij editor then getting following error. Where i'm doing wrong? ``` |Running Grails application Error | 2013-12-08 18:44:55,837 [localhost-startStop-1] ERROR pool.ConnectionPool - Unable to create initial connections of pool. Message: Driver:org.postgresql.Driver@7c3b99 returned null for URL:jdbc:postgres://localhost/clientpro Line | Method ->> 303 | innerRun in java.util.concurrent.FutureTask$Sync | 138 | run in java.util.concurrent.FutureTask | 895 | runTask in java.util.concurrent.ThreadPoolExecutor$Worker | 918 | run in '' ^ 662 | run . . in java.lang.Thread Error | 2013-12-08 18:44:55,877 [localhost-startStop-1] ERROR pool.ConnectionPool - Unable to create initial connections of pool. Message: Driver:org.postgresql.Driver@1ab5d6d returned null for URL:jdbc:postgres://localhost/clientpro Line | Method ->> 303 | innerRun in java.util.concurrent.FutureTask$Sync | 138 | run in java.util.concurrent.FutureTask | 895 | runTask in java.util.concurrent.ThreadPoolExecutor$Worker | 918 | run in '' ^ 662 | run . . in java.lang.Thread Error | 2013-12-08 18:44:56,160 [localhost-startStop-1] ERROR pool.ConnectionPool - Unable to create initial connections of pool. Message: Driver:org.postgresql.Driver@6bf551 returned null for URL:jdbc:postgres://localhost/clientpro Line | Method ->> 303 | innerRun in java.util.concurrent.FutureTask$Sync | 138 | run in java.util.concurrent.FutureTask | 895 | runTask in java.util.concurrent.ThreadPoolExecutor$Worker | 918 | run in '' ^ 662 | run . . in java.lang.Thread Error | 2013-12-08 18:44:56,174 [localhost-startStop-1] ERROR context.GrailsContextLoader - Error initializing the application: Error creating bean with name 'transactionManagerPostProcessor': Initialization of bean failed; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'transactionManager': Cannot resolve reference to bean 'sessionFactory' while setting bean property 'sessionFactory'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sessionFactory': Cannot resolve reference to bean 'lobHandlerDetector' while setting bean property 'lobHandler'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'lobHandlerDetector': Invocation of init method failed; nested exception is org.springframework.jdbc.support.MetaDataAccessException: Error while extracting DatabaseMetaData; nested exception is java.sql.SQLException: Driver:org.postgresql.Driver@6bf551 returned null for URL:jdbc:postgres://localhost/clientpro Message: Error creating bean with name 'transactionManagerPostProcessor': Initialization of bean failed; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'transactionManager': Cannot resolve reference to bean 'sessionFactory' while setting bean property 'sessionFactory'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sessionFactory': Cannot resolve reference to bean 'lobHandlerDetector' while setting bean property 'lobHandler'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'lobHandlerDetector': Invocation of init method failed; nested exception is org.springframework.jdbc.support.MetaDataAccessException: Error while extracting DatabaseMetaData; nested exception is java.sql.SQLException: Driver:org.postgresql.Driver@6bf551 returned null for URL:jdbc:postgres://localhost/clientpro Line | Method ->> 303 | innerRun in java.util.concurrent.FutureTask$Sync | 138 | run in java.util.concurrent.FutureTask | 895 | runTask in java.util.concurrent.ThreadPoolExecutor$Worker | 918 | run in '' ^ 662 | run . . in java.lang.Thread Caused by BeanCreationException: Error creating bean with name 'transactionManager': Cannot resolve reference to bean 'sessionFactory' while setting bean property 'sessionFactory'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sessionFactory': Cannot resolve reference to bean 'lobHandlerDetector' while setting bean property 'lobHandler'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'lobHandlerDetector': Invocation of init method failed; nested exception is org.springframework.jdbc.support.MetaDataAccessException: Error while extracting DatabaseMetaData; nested exception is java.sql.SQLException: Driver:org.postgresql.Driver@6bf551 returned null for URL:jdbc:postgres://localhost/clientpro ->> 303 | innerRun in java.util.concurrent.FutureTask$Sync | 138 | run in java.util.concurrent.FutureTask | 895 | runTask in java.util.concurrent.ThreadPoolExecutor$Worker | 918 | run in '' ^ 662 | run . . in java.lang.Thread Caused by BeanCreationException: Error creating bean with name 'sessionFactory': Cannot resolve reference to bean 'lobHandlerDetector' while setting bean property 'lobHandler'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'lobHandlerDetector': Invocation of init method failed; nested exception is org.springframework.jdbc.support.MetaDataAccessException: Error while extracting DatabaseMetaData; nested exception is java.sql.SQLException: Driver:org.postgresql.Driver@6bf551 returned null for URL:jdbc:postgres://localhost/clientpro ->> 303 | innerRun in java.util.concurrent.FutureTask$Sync | 138 | run in java.util.concurrent.FutureTask | 895 | runTask in java.util.concurrent.ThreadPoolExecutor$Worker | 918 | run in '' ^ 662 | run . . in java.lang.Thread Caused by BeanCreationException: Error creating bean with name 'lobHandlerDetector': Invocation of init method failed; nested exception is org.springframework.jdbc.support.MetaDataAccessException: Error while extracting DatabaseMetaData; nested exception is java.sql.SQLException: Driver:org.postgresql.Driver@6bf551 returned null for URL:jdbc:postgres://localhost/clientpro ->> 303 | innerRun in java.util.concurrent.FutureTask$Sync | 138 | run in java.util.concurrent.FutureTask | 895 | runTask in java.util.concurrent.ThreadPoolExecutor$Worker | 918 | run in '' ^ 662 | run . . in java.lang.Thread Caused by MetaDataAccessException: Error while extracting DatabaseMetaData; nested exception is java.sql.SQLException: Driver:org.postgresql.Driver@6bf551 returned null for URL:jdbc:postgres://localhost/clientpro ->> 303 | innerRun in java.util.concurrent.FutureTask$Sync | 138 | run in java.util.concurrent.FutureTask | 895 | runTask in java.util.concurrent.ThreadPoolExecutor$Worker | 918 | run in '' ^ 662 | run . . in java.lang.Thread Caused by SQLException: Driver:org.postgresql.Driver@6bf551 returned null for URL:jdbc:postgres://localhost/clientpro ->> 303 | innerRun in java.util.concurrent.FutureTask$Sync | 138 | run in java.util.concurrent.FutureTask | 895 | runTask in java.util.concurrent.ThreadPoolExecutor$Worker | 918 | run in '' ^ 662 | run . . in java.lang.Thread Error | Forked Grails VM exited with error Process finished with exit code 1 ``` DataSource file :- ``` dataSource { pooled = true driverClassName = "org.postgresql.Driver" dialect = org.hibernate.dialect.PostgreSQLDialect username = "postgres" password = "password" } hibernate { cache.use_second_level_cache = true cache.use_query_cache = true cache.provider_class='org.hibernate.cache.EhCacheProvider' } // environment specific settings environments { development { dataSource { dbCreate = "update" url = "jdbc:postgres://localhost/clientpro" username = "postgres" password = "password" } } test { dataSource { dbCreate = "update" url = "jdbc:postgres://localhost/clientpro" username = "postgres" password = "password" } } production { dataSource { dbCreate = "update" url = "jdbc:postgres://localhost/clientpro" username = "postgres" password = "password" } } } ```