com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException:

2013-07-11 11:40:17 WARN  BasicResourcePool:1841 - com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@61c3e3fb -- Acquisition Attempt Failed!!! Clearing pending acquires. While trying to acquire a needed new resource, we failed to succeed more than the maximum number of allowed acquisition attempts (30). Last acquisition attempt exception: 
com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Data source rejected establishment of connection,  message from server: "Too many connections"
 at sun.reflect.GeneratedConstructorAccessor16.newInstance(Unknown Source)
 at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
 at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
 at com.mysql.jdbc.Util.handleNewInstance(Util.java:406)
 at com.mysql.jdbc.Util.getInstance(Util.java:381)
 at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:984)
 at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:956)
 at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1095)
 at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2031)
 at com.mysql.jdbc.ConnectionImpl.(ConnectionImpl.java:718)
 at com.mysql.jdbc.JDBC4Connection.(JDBC4Connection.java:46)
 at sun.reflect.GeneratedConstructorAccessor12.newInstance(Unknown Source)
 at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
 at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
 at com.mysql.jdbc.Util.handleNewInstance(Util.java:406)
 at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:302)
 at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:282)
 at com.mchange.v2.c3p0.DriverManagerDataSource.getConnection(DriverManagerDataSource.java:134)
 at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:182)
 at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:171)
 at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1PooledConnectionResourcePoolManager.acquireResource(C3P0PooledConnectionPool.java:137)
 at com.mchange.v2.resourcepool.BasicResourcePool.doAcquire(BasicResourcePool.java:1014)
 at com.mchange.v2.resourcepool.BasicResourcePool.access$800(BasicResourcePool.java:32)
 at com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask.run(BasicResourcePool.java:1810)
 at com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(ThreadPoolAsynchronousRunner.java:547)

if you getting (com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException)Exception following are reason not c3p0 or configuration error :-

1. The database configuration details you have entered are incorrect or have changed. //Username , password etc.
2. The URL for the database is incorrect.
3. The database server is not running , network down, password expire etc.

Hope this help you .