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我在我的项目中使用带有应用程序引擎和 cloudSQL 的 Spring Hibernate，但我经常遇到一个错误。当应用程序有时变得理想时，就会发生这种情况。

对于每个查询（获取或保存/更新到数据库），我打开会话并在使用后关闭会话。像这样——我的数据库获取代码是

try{ 
        Session session = getSessionFactory().openSession();
        if(session != null)
        {

        List<Account> accounts = session.createQuery("from " + this.clazz.getName() + " where subDomainName = '"+subDomain+"'").list();

        session.close();

        if(accounts != null)
        {
            if(accounts.size()>0){
                return accounts.get(0);
            }
            else{
                return null;
            }
        }
        else
        {
            return null;
        }
        }
        else {
            return null;
        }
        }
        catch(Exception e){
            log.info("Error in retriving subdomain details :: in Account Dao");
            return null;

        }

我正在使用 Autowired 结构。但是当应用程序在某个时候变得理想时，并且在我刷新页面一段时间后，它在应用引擎上显示错误为 CloudSQL 的 Stream Closed，错误如下所示...

错误是：

6 Jan, 2014 6:21:04 AM com.google.appengine.repackaged.org.apache.http.impl.client.DefaultRequestDirector handleResponse
WARNING: Authentication error: Unable to respond to any of these challenges: {bearer=WWW-Authenticate: Bearer realm="https://www.google.com/accounts/AuthSubRequest", error=invalid_token}
6 Jan, 2014 6:21:04 AM com.google.appengine.api.rdbms.dev.LocalRdbmsServiceRemoteDriver openConnection
WARNING: openConnection
java.sql.SQLException: Stream closed
    at com.google.cloud.sql.jdbc.internal.googleapi.RpcGoogleApi.newOpenConnectionIOException(RpcGoogleApi.java:187)
    at com.google.cloud.sql.jdbc.internal.googleapi.RpcGoogleApi.openConnection(RpcGoogleApi.java:105)
    at com.google.appengine.api.rdbms.dev.LocalRdbmsServiceRemoteDriver.openConnection(LocalRdbmsServiceRemoteDriver.java:206)
    at com.google.appengine.api.rdbms.dev.LocalRdbmsService.openConnection(LocalRdbmsService.java:119)
    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.google.appengine.tools.development.ApiProxyLocalImpl$AsyncApiCall.callInternal(ApiProxyLocalImpl.java:498)
    at com.google.appengine.tools.development.ApiProxyLocalImpl$AsyncApiCall.call(ApiProxyLocalImpl.java:452)
    at com.google.appengine.tools.development.ApiProxyLocalImpl$AsyncApiCall.call(ApiProxyLocalImpl.java:430)
    at java.util.concurrent.Executors$PrivilegedCallable$1.run(Executors.java:461)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.util.concurrent.Executors$PrivilegedCallable.call(Executors.java:458)
    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
    at java.util.concurrent.FutureTask.run(FutureTask.java:138)
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918)
    at java.lang.Thread.run(Thread.java:662)
Caused by: java.io.IOException: Stream closed
    at java.util.zip.GZIPInputStream.ensureOpen(GZIPInputStream.java:42)
    at java.util.zip.GZIPInputStream.read(GZIPInputStream.java:85)

为此，为了让应用程序引擎和 cloudSQL 参与，我编写了某些请求的 cron 工作，但这不是可行的解决方案，我不明白为什么 cloudSQL 会关闭其应用程序引擎的流。

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