java.io.NotSerializableException 在 java 代码中？

Question

我有 class，其中所有内部 classes 都像这样被序列化

public class BaseClass{
.......
......
.......
public class AccountPaymentDetailBean implements Serializable {
//inner class 
}

}

但我的情况低于异常

java.io.NotSerializableException: com.core.shi.core.folder.BaseClass at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1180) at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1528) at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1493) at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1416) at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1174) at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1528) at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1493) at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1416) at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1174) at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:346) at org.zkoss.zk.ui.AbstractPage.writeObject(AbstractPage.java:232) at sun.reflect.GeneratedMethodAccessor124.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:601) at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:975) at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1480) at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1416) at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1174) at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:346) at java.util.LinkedList.writeObject(LinkedList.java:1118) at sun.reflect.GeneratedMethodAccessor25.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:601) at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:975) at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1480) at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1416) at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1174) at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1528) at java.io.ObjectOutputStream.defaultWriteObject(ObjectOutputStream.java:438) at org.zkoss.zk.ui.impl.DesktopImpl.writeObject(DesktopImpl.java:1044) at sun.reflect.GeneratedMethodAccessor118.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:601) at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:975) at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1480) at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1416) at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1174) at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1528) at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1493) at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1416) at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1174) at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:346) at java.util.HashMap.writeObject(HashMap.java:1100) at sun.reflect.GeneratedMethodAccessor24.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:601) at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:975) at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1480) at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1416) at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1174) at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1528) at java.io.ObjectOutputStream.defaultWriteObject(ObjectOutputStream.java:438) at org.zkoss.util.CacheMap.writeObject(CacheMap.java:633) at sun.reflect.GeneratedMethodAccessor112.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:601) at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:975) at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1480) at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1416) at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1174) at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1528) at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1493) at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1416) at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1174) at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:346) at org.zkoss.zk.ui.http.SimpleSession.writeThis(SimpleSession.java:433) at org.zkoss.zk.ui.http.SerializableSession.writeObject(SerializableSession.java:71) at sun.reflect.GeneratedMethodAccessor111.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:601) at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:975) at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1480) at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1416) at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1174) at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:346) at com.csdcsystems.amanda.servlet.AmandaSessionFilter.sizeof(AmandaSessionFilter.java:88) at com.csdcsystems.amanda.servlet.AmandaSessionFilter.testSerializability(AmandaSessionFilter.java:73) at com.csdcsystems.amanda.servlet.AmandaSessionFilter.doFilter(AmandaSessionFilter.java:55) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408) at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1040) at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:607) at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at java.lang.Thread.run(Thread.java:722)

有人能告诉我 BaseClass$5 是什么意思吗？这个异常到底说明了什么？

Answer 1

Q2) 这个异常到底说明了什么？
内部 classes 不应该实现 Serializable。它们使用编译器生成的合成字段来存储对封闭实例的引用，并存储封闭范围内局部变量的值。
内部 class 的默认序列化形式定义不正确。但是，静态成员 class 可以实现 Serializable。

更多信息here.

Q1) 谁能告诉我 BaseClass$5 是什么意思？
没有更多的进一步细节。 BAseClass$5 表示这些异常发生在 class.

Answer 2

Q1) 谁能告诉我 BaseClass$5 是什么意思？有时 innerclasses 没有名字。在你的情况下它有一个名字。我们直接即时创建一个 class（例如接口的实现者）并给出实现，并以 :) 结束它的情况。然后 class 没有名字。那么 JVM 如何为此创建一个 .class 文件？？？ - 答案是 $ 命名约定。所以这样的 classes 被创建为 BaseClass$1, BaseClass$2 ...等等。

必须至少有 5 个这样的内部未命名 classes - 检查你的 classes - 哪个得到哪个数字？-> 我认为 它纯粹是顺序。例如- clickListener 纯属虚构，我试图展示的示例...

public class myclass{
    public void mymethod(){
          this.addClickListener(new ClickListener(){
               public void click(){
                   S.O.P("Clicked !!!");
               }
          });
    }
}

所以 CLickListener 的实现被编译为-> 我的class$1.class

Answer 3

Could someone please tell me what is meaning of BaseClass?

BaseClass中定义的第五个匿名内部class

匿名内部 classes 被分配一个等于封闭类型的自动名称，加上一个美元符号，再加上一个序号。在您的示例中："BaseClass" + "$" + "5".

What this exception exactly telling?

显然您正在使用的框架正在测试 HTTP 会话的可序列化性 (com.csdcsystems.amanda.servlet.AmandaSessionFilter.testSerializability)
并且您的会话（org.zkoss.zk.ui.http.SerializableSession 类型）似乎在内部定义了一个匿名 BaseClass。
会话中的每个对象都必须是可序列化的，因此您会收到此错误。

java.io.NotSerializableException 在 java 代码中？

java.io.NotSerializableException in java code?

java

serialization