я пытаюсь подключиться к базе данных в Java, используя jdbcTemplate и яЯ получаю ошибку ниже. Я давно гуглил и все найденные мной решения нене решить мою проблему. Я пробовал несколько разных БД (как SQLServer, так и MySQL), но ни одна не работала.

SEVERE: Servlet.service() for servlet [Faces Servlet] in context with path [/promotion-handler-admin] threw exception [Could not open JDBC Connection for transaction; nested exception is java.sql.SQLException: Connections could not be acquired from the underlying database!] with root cause
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)
    at com.mchange.v2.c3p0.impl.AbstractPoolBackedDataSource.getConnection(AbstractPoolBackedDataSource.java:128)
    at org.springframework.jdbc.datasource.DataSourceTransactionManager.doBegin(DataSourceTransactionManager.java:202)
    at org.springframework.transaction.support.AbstractPlatformTransactionManager.getTransaction(AbstractPlatformTransactionManager.java:371)
    at org.springframework.transaction.interceptor.TransactionAspectSupport.createTransactionIfNecessary(TransactionAspectSupport.java:335)
    at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:105)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
    at org.springframework.aop.framework.Cglib2AopProxy$DynamicAdvisedInterceptor.intercept(Cglib2AopProxy.java:622)
    ...

Это мой файл свойств:

app.driverClassName=net.sourceforge.jtds.jdbc.Driver
app.url=jdbc:sqlserver://myUrl:port;databaseName=my_database
app.username=myUsername
app.password=myPassword

WebApp / WEB-INF / ApplicationContext-database.xml:

Класс DAO:

@Repository
public class CampaignDAO {
    private JdbcTemplate jdbcTemplate;

    @Resource(name = "dataSource")
    public void setDataSource(DataSource dataSource) {
        this.jdbcTemplate = new JdbcTemplate(dataSource);
    }

public List getCampaignList() {
    Long start = System.currentTimeMillis();

    List queryList;

    try {
        queryList = jdbcTemplate.query("SELECT * FROM campaign", new RowMapper() {
            public Campaign mapRow(ResultSet rs, int line) throws SQLException {
                Campaign campaign = new Campaign();
                campaign.setId(rs.getLong("id"));
                campaign.setExtraInfo(rs.getString("extra_info"));
                campaign.setBeginTime(rs.getDate("begin_time"));
                campaign.setEndTime(rs.getDate("end_time"));

                return campaign;

            }
        });
    } finally {
         ...
    }
    return queryList;
}