JDBCExceptionReporter - SQL Error: 17008, SQLState: 08003

Question

I am getting below error while fetching records and its sporadic , it gets fixed either by restarting the server or by itself after some time. I am using Struts 2, Oracle 11g, Hibernate 3.

Error

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 

C3P0 Properties

<property name="c3p0.acquire_increment">4</property>
<property name="c3p0.idle_test_period">100</property> <!-- seconds -->
<property name="c3p0.max_size">20</property>
<property name="c3p0.max_statements">0</property    >
<property name="c3p0.min_size">10</property>
<property name="c3p0.timeout">300</property>
<property name="c3p0.acquireRetryDelay">1000</property>
<property name="c3p0.acquireRetryAttempts">65</property>
<property name="c3p0.breakAfterAcquireFailure">false</property>
<property name="c3p0.numHelperThreads">8</property>
<property name="c3p0.maxAdministrativeTaskTime">1</property>

Code

public List<UsersTai> listUser(String userName, String password) {
    _logger.debug("listUser");
    List<UsersTai> 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();

Solution

You can't get a current hibernate session if it's not available. Change the code to open a new session.

Session session = HibernateUtil.getSessionFactory().openSession();

At the end when you no longer needed it use the session factory to close a session.