JDBCExceptionReporter — ошибка SQL: 17008, SQLState: 08003 ⇐ JAVA

[Anonymous]

Я получаю сообщение об ошибке ниже при получении записей, и это случается спорадически. Это исправляется либо путем перезапуска сервера, либо само по себе через некоторое время. Я использую Struts 2, Oracle 11g, Hibernate 3.
Ошибка:
2014-05-06 13:38:51 WARN JDBCExceptionReporter:100 - SQL Error: 17002, SQLState: 08006
2014-05-06 13:38:51 ERROR JDBCExceptionReporter:101 - IO Error: Connection timed out
2014-05-06 13:38:51 ERROR Dispatcher:38 - Exception occurred during processing request: null
java.lang.NullPointerException
at com.tai.dao.UsersTaiImplDAO.listUser(UsersTaiImplDAO.java:37)
at com.tai.web.UsersTaiAction.userLogin(UsersTaiAction.java:55)
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:597)
at com.opensymphony.xwork2.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:450)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
at com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:167)
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
at com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:265)
at org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.java:68)
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
at com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(ConversionErrorInterceptor.java:138)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:239)
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
at


Свойства C3P0:
4
100
20
0
10
300
1000
65
false
8
1

Код:
public List listUser(String userName, String password) {
_logger.debug("listUser");
List usersTai = null;
String name= userName.substring(userName.indexOf('@')).trim();
try {
Session session = HibernateUtil.getSessionFactory().getCurrentSession();
session.beginTransaction();
usersTai = session.createQuery("from UsersTai where username='" + userName +"' or username= '"+name + "' and USERPASSWORD='"+ password +"'").list();
session.getTransaction().commit();


Подробнее здесь: https://stackoverflow.com/questions/235 ... tate-08003