JDBCExceptionReporter - SQL 错误：17008，SQLState：08003

Question

我在获取记录时遇到以下错误并且它是零星的，它可以通过重新启动服务器或在一段时间后自行修复。我正在使用 Struts 2、Oracle 11g、Hibernate 3。

错误：

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 特性：

<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>

代码：

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();

Answer 1

如果当前的休眠会话不可用，则无法获取该会话。更改代码以打开新会话。

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

最后，当您不再需要它时，请使用会话工厂关闭会话。