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我正在使用带有 JSF 的 Microsoft SQL Server。

我一直收到这个例外：

IOException while loading persisted sessions: java.io.WriteAbortedException: writing aborted; java.io.NotSerializableException: com.microsoft.sqlserver.jdbc.SQLServerConnection
java.io.WriteAbortedException: writing aborted; java.io.NotSerializableException: com.microsoft.sqlserver.jdbc.SQLServerConnection
    at java.io.ObjectInputStream.readObject0(Unknown Source)
    at java.io.ObjectInputStream.defaultReadFields(Unknown Source)
    at java.io.ObjectInputStream.readSerialData(Unknown Source)
    at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source)
    at java.io.ObjectInputStream.readObject0(Unknown Source)
    at java.io.ObjectInputStream.defaultReadFields(Unknown Source)
    at java.io.ObjectInputStream.readSerialData(Unknown Source)
    at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source)
    at java.io.ObjectInputStream.readObject0(Unknown Source)
    at java.io.ObjectInputStream.defaultReadFields(Unknown Source)
    at java.io.ObjectInputStream.readSerialData(Unknown Source)
    at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source)
    at java.io.ObjectInputStream.readObject0(Unknown Source)
    at java.io.ObjectInputStream.readObject(Unknown Source)
    at org.apache.catalina.session.StandardSession.readObject(StandardSession.java:1587)
    at org.apache.catalina.session.StandardSession.readObjectData(StandardSession.java:1060)
    at org.apache.catalina.session.StandardManager.doLoad(StandardManager.java:284)
    at org.apache.catalina.session.StandardManager.load(StandardManager.java:204)
    at org.apache.catalina.session.StandardManager.startInternal(StandardManager.java:470)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)
    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5169)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)
    at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:1033)
    at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:774)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)
    at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:1033)
    at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:291)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)
    at org.apache.catalina.core.StandardService.startInternal(StandardService.java:443)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)
    at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:726)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)
    at org.apache.catalina.startup.Catalina.start(Catalina.java:620)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:303)
    at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:431)
Caused by: java.io.NotSerializableException: com.microsoft.sqlserver.jdbc.SQLServerConnection
    at java.io.ObjectOutputStream.writeObject0(Unknown Source)
    at java.io.ObjectOutputStream.defaultWriteFields(Unknown Source)
    at java.io.ObjectOutputStream.writeSerialData(Unknown Source)
    at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source)
    at java.io.ObjectOutputStream.writeObject0(Unknown Source)
    at java.io.ObjectOutputStream.defaultWriteFields(Unknown Source)
    at java.io.ObjectOutputStream.writeSerialData(Unknown Source)
    at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source)
    at java.io.ObjectOutputStream.writeObject0(Unknown Source)
    at java.io.ObjectOutputStream.defaultWriteFields(Unknown Source)
    at java.io.ObjectOutputStream.writeSerialData(Unknown Source)
    at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source)
    at java.io.ObjectOutputStream.writeObject0(Unknown Source)
    at java.io.ObjectOutputStream.writeObject(Unknown Source)
    at org.apache.catalina.session.StandardSession.writeObject(StandardSession.java:1663)
    at org.apache.catalina.session.StandardSession.writeObjectData(StandardSession.java:1077)
    at org.apache.catalina.session.StandardManager.doUnload(StandardManager.java:411)
    at org.apache.catalina.session.StandardManager.unload(StandardManager.java:353)
    at org.apache.catalina.session.StandardManager.stopInternal(StandardManager.java:497)
    at org.apache.catalina.util.LifecycleBase.stop(LifecycleBase.java:225)
    at org.apache.catalina.core.StandardContext$4.call(StandardContext.java:5391)
    at org.apache.catalina.core.StandardContext$4.call(StandardContext.java:5374)
    at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)
    at java.util.concurrent.FutureTask.run(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)

例如，我将与 SQL Server 相关的 Java Bean 设置implements Serializable为

@ManagedBean
@SessionScoped
public class SqlBean implements Serializable {

    private Connection  conn = null;

    public SqlBean() {
        super();
        System.out.println("Starts to read!");
        String dbName = "//some dbName";
        String serverip="//some serverip";
        String serverport="//some serverport";
        String url = "jdbc:sqlserver://"+serverip+"\\SQLEXPRESS:"+serverport+";databaseName="+dbName+"";
        String driver = "com.microsoft.sqlserver.jdbc.SQLServerDriver";
        String databaseUserName = "//some user";
        String databasePassword = "//some password";
        try {
            Class.forName(driver).newInstance();
            conn = DriverManager.getConnection(url, databaseUserName, databasePassword);
            if(conn!=null) System.out.println("Connection Successful!");
        }catch(Exception e){
            e.printStackTrace();
            System.out.println("Error Trace in getConnection() : " + e.getMessage());
        }
    }
}

连接总是成功的。完全迷失了这一点。任何帮助将不胜感激。

4

1 回答 1

2

这在两个方面是非常错误的：

//resource injection
private Connection  conn = null;
  1. 这绝对不是资源注入。
  2. 保持连接打开那么长时间并在 HTTP 会话中的多个请求之间共享它是糟糕的设计并且不是线程安全的。

您应该以获取和关闭所有数据库资源的方式重写所有 JDBC 代码Connection，(Prepared)Statement并且ResultSet在同一个 try-finally 块中的最短范围内。

您的具体问题是由于 TCP/IP 连接无法序列化Serializable这一非常简单的原因而没有实现数据库连接。

也可以看看：

请注意，这个问题与 JSF 完全无关。您应该将所有 JDBC 代码放在独立的 DAO 类中，并确保所有 JSF 托管 bean 完全没有java.sql导入。为了更进一步，开始学习 EJB 和 JPA。这样一来，所有的数据库交互都可以在 oneliners 中完成，而无需所有原始连接/语句/结果集混乱。如果您想使用 Java EE，这也是您应该遵循的路径。

于 2013-08-21T20:21:37.813 回答