SSH整合报错

今SSH整合的时候报错如下：

三月 16, 2017 10:33:03 上午 org.springframework.orm.hibernate4.HibernateTransactionManager afterPropertiesSet

信息: Using DataSource [com.mchange.v2.c3p0.ComboPooledDataSource [ acquireIncrement -> 3, acquireRetryAttempts -> 30, acquireRetryDelay -> 1000, autoCommitOnClose -> false, automaticTestTable -> null, breakAfterAcquireFailure -> false, checkoutTimeout -> 0, connectionCustomizerClassName -> null, connectionTesterClassName -> com.mchange.v2.c3p0.impl.DefaultConnectionTester, dataSourceName -> 1b61a0v9m1n37j6g1oisfv6|5daf07f1, debugUnreturnedConnectionStackTraces -> false, description -> null, driverClass -> com.mysql.jdbc.Driver, factoryClassLocation -> null, forceIgnoreUnresolvedTransactions -> false, identityToken -> 1b61a0v9m1n37j6g1oisfv6|5daf07f1, idleConnectionTestPeriod -> 0, initialPoolSize -> 5, jdbcUrl -> jdbc:mysql://localhost:3306/shop, maxAdministrativeTaskTime -> 0, maxConnectionAge -> 0, maxIdleTime -> 0, maxIdleTimeExcessConnections -> 0, maxPoolSize -> 10, maxStatements -> 0, maxStatementsPerConnection -> 0, minPoolSize -> 3, numHelperThreads -> 3, preferredTestQuery -> null, properties -> {user=******, password=******}, propertyCycle -> 0, statementCacheNumDeferredCloseThreads -> 0, testConnectionOnCheckin -> false, testConnectionOnCheckout -> false, unreturnedConnectionTimeout -> 0, userOverrides -> {}, usesTraditionalReflectiveProxies -> false ]] of Hibernate SessionFactory for HibernateTransactionManager

三月 16, 2017 10:33:03 上午 org.springframework.web.context.ContextLoader initWebApplicationContext

信息: Root WebApplicationContext: initialization completed in 5735 ms

三月 16, 2017 10:33:03 上午 org.apache.catalina.session.StandardManager doLoad

严重:IOException while loading persisted sessions:java.io.WriteAbortedException: writing aborted;java.io.NotSerializableException: com.ren.SShShop.category.vo.Category

java.io.WriteAbortedException: writing aborted;java.io.NotSerializableException: com.ren.SShShop.category.vo.Category

at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1354)

at java.io.ObjectInputStream.readObject(ObjectInputStream.java:370)

at java.util.ArrayList.readObject(ArrayList.java:771)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

at java.lang.reflect.Method.invoke(Method.java:606)

at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1017)

at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1893)

at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1798)

at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1350)

at java.io.ObjectInputStream.readObject(ObjectInputStream.java:370)

at org.apache.catalina.session.StandardSession.readObject(StandardSession.java:1595)

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:491)

at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)

at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5300)

at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)

at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:901)

at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:877)

at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:633)

at org.apache.catalina.startup.HostConfig.deployDescriptor(HostConfig.java:657)

at org.apache.catalina.startup.HostConfig$DeployDescriptor.run(HostConfig.java:1637)

at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)

at java.util.concurrent.FutureTask.run(FutureTask.java:262)

at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)

at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)

at java.lang.Thread.run(Thread.java:745)

Caused by: java.io.NotSerializableException: com.ren.SShShop.category.vo.Category

at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1183)

at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)

at java.util.ArrayList.writeObject(ArrayList.java:742)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

at java.lang.reflect.Method.invoke(Method.java:606)

at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)

at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)

at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)

at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)

at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)

at org.apache.catalina.session.StandardSession.writeObject(StandardSession.java:1671)

at org.apache.catalina.session.StandardSession.writeObjectData(StandardSession.java:1077)

at org.apache.catalina.session.StandardManager.doUnload(StandardManager.java:432)

at org.apache.catalina.session.StandardManager.unload(StandardManager.java:353)

at org.apache.catalina.session.StandardManager.stopInternal(StandardManager.java:518)

at org.apache.catalina.util.LifecycleBase.stop(LifecycleBase.java:232)

at org.apache.catalina.core.StandardContext.stopInternal(StandardContext.java:5479)

at org.apache.catalina.util.LifecycleBase.stop(LifecycleBase.java:232)

at org.apache.catalina.core.ContainerBase$StopChild.call(ContainerBase.java:1575)

at org.apache.catalina.core.ContainerBase$StopChild.call(ContainerBase.java:1564)

... 4 more

 

我将Category实现了Serializable接口以后就不报错了：public class Category implements Serializable

原因：

（1）当一个JavaBean在构造工具内被用户化，并与其它Bean建立连接之后，它的所有状态都应当可被保存，下一次被load进构造工具内或在运行时，就应当是上一次修改完的信息。为了能做到这一点，要把Bean的某些字段的信息保存下来，在定义Bean时要使它实现Java.io.Serializable接口。

（2）实现了序列化接口的Bean中字段的信息将被自动保存。若不想保存某些字(这里的Bean中字段的信息将被自动保存是什么意思？这个自动保存是怎么实现的？）

（3）段的信息则可在这些字段前冠以transient或static关键字，transient和static变量的信息是不可被保存的。通常，一个Bean所有公开出来的属性都应当是被保存的，也可有选择地保存内部状态。Bean开发者在修改软件时，可以添加字段，移走对其它类的引用，改变一个字段的private、protected或public状态，这些都不影响类的存储结构关系。然而，当从类中删除一个字段，改变一个变量在类体系中的位置，把某个字段改成transient/static，或原来是transient/static，现改为别的特性时，都将引起存储关系的变化。

　　所谓的Serializable,就是java提供的通用数据保存和读取的接口。至于从什么地方读出来和保存到哪里去都被隐藏在函数参数的背后了。这样子，任何类型只要实现了Serializable接口，就可以被保存到文件中，或者作为数据流通过网络发送到别的地方。也可以用管道来传输到系统的其他程序中。这样子极大的简化了类的设计。只要设计一个保存一个读取功能就能解决上面说得所有问题。