Problema ao fazer deploy de uma aplicação num servidor WEB

O servidor usa MySQL, consigo me conectar normalmente a base utilizando o client.
Alguém já teve esse problema?

HTTP Status 500 -

type Exception report

message

description The server encountered an internal error () that prevented it from fulfilling this request.

exception

javax.servlet.ServletException: Cannot open connection
	org.vraptor.VRaptorServlet.service(VRaptorServlet.java:82)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:802)

root cause

org.hibernate.exception.GenericJDBCException: Cannot open connection
	org.hibernate.exception.SQLStateConverter.handledNonSpecificException(SQLStateConverter.java:103)
	org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:91)
	org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:43)
	org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:29)
	org.hibernate.jdbc.ConnectionManager.openConnection(ConnectionManager.java:420)
	org.hibernate.jdbc.ConnectionManager.getConnection(ConnectionManager.java:144)
	org.hibernate.jdbc.AbstractBatcher.prepareQueryStatement(AbstractBatcher.java:139)
	org.hibernate.loader.Loader.prepareQueryStatement(Loader.java:1538)
	org.hibernate.loader.Loader.doQuery(Loader.java:661)
	org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:224)
	org.hibernate.loader.Loader.doList(Loader.java:2211)
	org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2095)
	org.hibernate.loader.Loader.list(Loader.java:2090)
	org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:388)
	org.hibernate.hql.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:338)
	org.hibernate.engine.query.HQLQueryPlan.performList(HQLQueryPlan.java:172)
	org.hibernate.impl.SessionImpl.list(SessionImpl.java:1121)
	org.hibernate.impl.QueryImpl.list(QueryImpl.java:79)
	org.hibernate.impl.AbstractQueryImpl.uniqueResult(AbstractQueryImpl.java:804)
	br.com.softseed.rasbim.dao.UsuarioDao.existeUnico(UsuarioDao.java:24)
	br.com.softseed.rasbim.logic.AdminLogic.efetuaLogin(AdminLogic.java:30)
	sun.reflect.GeneratedMethodAccessor571.invoke(Unknown Source)
	sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	java.lang.reflect.Method.invoke(Method.java:585)
	org.vraptor.reflection.ReflectionUtil.invoke(ReflectionUtil.java:86)
	org.vraptor.reflection.JavaMethod.invoke(JavaMethod.java:31)
	org.vraptor.component.DefaultLogicMethod.execute(DefaultLogicMethod.java:122)
	org.vraptor.interceptor.ExecuteLogicInterceptor.intercept(ExecuteLogicInterceptor.java:40)
	org.vraptor.core.InterceptorsLogicFlow.execute(InterceptorsLogicFlow.java:72)
	org.vraptor.interceptor.SettingAndValidationInterceptor.intercept(SettingAndValidationInterceptor.java:141)
	org.vraptor.core.InterceptorsLogicFlow.execute(InterceptorsLogicFlow.java:72)
	org.vraptor.interceptor.InjectionInterceptor.intercept(InjectionInterceptor.java:45)
	org.vraptor.core.InterceptorsLogicFlow.execute(InterceptorsLogicFlow.java:72)
	org.vraptor.interceptor.ComponentLookupInterceptor.intercept(ComponentLookupInterceptor.java:56)
	org.vraptor.core.InterceptorsLogicFlow.execute(InterceptorsLogicFlow.java:72)
	br.com.softseed.rasbim.logic.DaoInterceptor.intercept(DaoInterceptor.java:17)
	org.vraptor.core.InterceptorsLogicFlow.execute(InterceptorsLogicFlow.java:72)
	org.vraptor.interceptor.RegisterAttributesInteceptor.intercept(RegisterAttributesInteceptor.java:57)
	org.vraptor.core.InterceptorsLogicFlow.execute(InterceptorsLogicFlow.java:72)
	org.vraptor.core.VRaptorExecution.execute(VRaptorExecution.java:89)
	org.vraptor.core.VRaptorController.execute(VRaptorController.java:39)
	org.vraptor.VRaptorServlet.service(VRaptorServlet.java:57)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:802)

Cara …verifca as configuracoes de conexao…

ele ao esta conseguindo conectar com a base de dados…
falow…