Java代码

public class PageBase extends WebPage
{
  private static final long serialVersionUID = 1L;
  ...
  @Override
  protected void onAfterRender()
  {
    super.onAfterRender();

    Session ssnSession = Session.get();
    long loSize = ssnSession.getSizeInBytes();    <-- Exception is raised here
    ...
  }
  ...
}

堆栈跟踪

11-Jul-2012 19:30:11 org.apache.wicket.util.lang.WicketObjects$SerializingObjectSizeOfStrategy sizeOf
WARNING: Unable to determine object size: [...].MySession@d2f5f1
java.io.NotSerializableException: java.lang.Object
  at java.io.ObjectOutputStream.writeObject0(Unknown Source)
  at java.io.ObjectOutputStream.defaultWriteFields(Unknown Source)
  at java.io.ObjectOutputStream.writeSerialData(Unknown Source)
  at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source)
  at java.io.ObjectOutputStream.writeObject0(Unknown Source)
  at java.io.ObjectOutputStream.writeObject(Unknown Source)
  at org.apache.wicket.util.lang.WicketObjects$SerializingObjectSizeOfStrategy.sizeOf(WicketObjects.java:124)
  at org.apache.wicket.util.lang.WicketObjects.sizeof(WicketObjects.java:416)
  at org.apache.wicket.Session.getSizeInBytes(Session.java:439)
  at [...].PageBase.onAfterRender(PageBase.java:212)
  at org.apache.wicket.Component.afterRender(Component.java:962)
  at org.apache.wicket.Component.render(Component.java:2326)
  at org.apache.wicket.Page.renderPage(Page.java:1035)
  at org.apache.wicket.request.handler.render.WebPageRenderer.renderPage(WebPageRenderer.java:105)
...

我的软件环境

Web框架：Wicket 1.5.7
Java：1.6.0_33; Java HotSpot（TM）客户端VM 20.8-b03
网络服务器系统：Google App Engine for Java 1.7.0版
操作系统：Microsoft Windows XP Home Edition版本2002 SP3（在x86上运行的版本5.1; Cp1252; en_GB）

Answer 1

我已设法使用

修复我的问题

dev_appserver.cmd --jvm_flag=-Dsun.io.serialization.extendedDebugInfo=true

突出显示有问题的数据成员。在我使用的WebSession个实例中

private final Object m_objLockItemPaidStatus = new Object();

锁定synchronized块中的处理。我已将此更改为使用

的实例

/**
 * This class is the simplest possible class which can be used as an object
 * to lock processing in a <code>synchronized</code> block
 * and which can also be serialised.
 * (This class extends <code>java.lang.Object</code> solely to implement the
 * <code>java.io.Serializable</code> interface.)
 */
public static class LockObject extends Object implements Serializable
{
  private static final long serialVersionUID = 1L;

  public LockObject()
  {
    super();
  }
}

相反，为了确保我的WebSession个实例可以序列化（因此我也可以使用WebSession#getSizeInBytes()找到它们的大致尺寸。）

有一件事我觉得很奇怪，因为我希望Wicket在我的Google App Engine for Java（GAE / J）环境中序列化我的WebSession个实例，为什么使用GAE / J开发已经没有找到它网络服务器？

无法使用Session.getSizeInBytes（）确定会话大小

Java代码

堆栈跟踪

我的软件环境

1 个答案: