Dynamic configuration from Java classes to Java Config

[aruld]

I posted too quickly

If I try your other suggestion by making the DataSource bean @Bean(scope=DefaultScopes.PROTOTYPE), this works.

Do you think this approach guarantees this to work in all cases?

-Arul

[aruld]

When I try to query JPA entities with this approach, I get the below error.

Exception in thread "main" org.springframework.transaction.CannotCreateTransactionException: Could not open JPA EntityManager for transaction; nested exception is javax.persistence.PersistenceException: org.hibernate.exception.GenericJDBCException: Cannot open connection
	at org.springframework.orm.jpa.JpaTransactionManager.doBegin(JpaTransactionManager.java:375)
	at org.springframework.transaction.support.AbstractPlatformTransactionManager.getTransaction(AbstractPlatformTransactionManager.java:377)
	at org.springframework.transaction.interceptor.TransactionAspectSupport.createTransactionIfNecessary(TransactionAspectSupport.java:263)
	at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:101)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
	at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
	at $Proxy46.exists(Unknown Source)
	at impl.DaoImpl.<init>(DaoImpl.java:145)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:585)
	at com.intellij.rt.execution.application.AppMain.main(AppMain.java:90)
Caused by: javax.persistence.PersistenceException: org.hibernate.exception.GenericJDBCException: Cannot open connection
	at org.hibernate.ejb.AbstractEntityManagerImpl.throwPersistenceException(AbstractEntityManagerImpl.java:614)
	at org.hibernate.ejb.TransactionImpl.begin(TransactionImpl.java:41)
	at org.springframework.orm.jpa.DefaultJpaDialect.beginTransaction(DefaultJpaDialect.java:70)
	at org.springframework.orm.jpa.vendor.HibernateJpaDialect.beginTransaction(HibernateJpaDialect.java:52)
	at org.springframework.orm.jpa.JpaTransactionManager.doBegin(JpaTransactionManager.java:330)
	... 17 more
Caused by: org.hibernate.exception.GenericJDBCException: Cannot open connection
	at org.hibernate.exception.SQLStateConverter.handledNonSpecificException(SQLStateConverter.java:126)
	at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:114)
	at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:66)
	at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:52)
	at org.hibernate.jdbc.ConnectionManager.openConnection(ConnectionManager.java:449)
	at org.hibernate.jdbc.ConnectionManager.getConnection(ConnectionManager.java:167)
	at org.hibernate.jdbc.JDBCContext.connection(JDBCContext.java:142)
	at org.hibernate.transaction.JDBCTransaction.begin(JDBCTransaction.java:85)
	at org.hibernate.impl.SessionImpl.beginTransaction(SessionImpl.java:1353)
	at org.hibernate.ejb.TransactionImpl.begin(TransactionImpl.java:38)
	... 20 more
Caused by: java.sql.SQLException: Connections could not be acquired from the underlying database!
	at com.mchange.v2.sql.SqlUtils.toSQLException(SqlUtils.java:106)
	at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutPooledConnection(C3P0PooledConnectionPool.java:529)
	at com.mchange.v2.c3p0.impl.AbstractPoolBackedDataSource.getConnection(AbstractPoolBackedDataSource.java:128)
	at org.hibernate.ejb.connection.InjectedDataSourceConnectionProvider.getConnection(InjectedDataSourceConnectionProvider.java:46)
	at org.hibernate.jdbc.ConnectionManager.openConnection(ConnectionManager.java:446)
	... 25 more
Caused by: com.mchange.v2.resourcepool.CannotAcquireResourceException: A ResourcePool could not acquire a resource from its primary factory or source.
	at com.mchange.v2.resourcepool.BasicResourcePool.awaitAvailable(BasicResourcePool.java:1319)
	at com.mchange.v2.resourcepool.BasicResourcePool.prelimCheckoutResource(BasicResourcePool.java:557)
	at com.mchange.v2.resourcepool.BasicResourcePool.checkoutResource(BasicResourcePool.java:477)
	at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutPooledConnection(C3P0PooledConnectionPool.java:525)
	... 28 more

Do you have any clues as to why this is happening?

Thanks!
Arul