java.io.NotSerializableException与Java8/Jetty9兼容的App Engine环境

Question

当尝试将文件上传到在Java8/Jetty9兼容的托管VM环境中运行的Google App Engine应用程序时，因为org.eclipse.jetty.util.MultiPartInputStreamParser$MultiPart类没有实现java.io.Serializable接口，所以我得到了以下堆栈跟踪。

我得到了以下异常：

[INFO] java.io.NotSerializableException: org.eclipse.jetty.util.MultiPartInputStreamParser$MultiPart
[INFO]  at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1184)
[INFO]  at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1548)
[INFO]  at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1509)
[INFO]  at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1432)
[INFO]  at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1178)
[INFO]  at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:348)
[INFO]  at java.util.HashMap.internalWriteEntries(HashMap.java:1777)
[INFO]  at java.util.HashMap.writeObject(HashMap.java:1354)
[INFO]  at sun.reflect.GeneratedMethodAccessor24.invoke(Unknown Source)
[INFO]  at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
[INFO]  at java.lang.reflect.Method.invoke(Method.java:498)
[INFO]  at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:1028)
[INFO]  at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1496)
[INFO]  at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1432)
[INFO]  at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1178)
[INFO]  at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:348)
[INFO]  at java.util.LinkedHashMap.internalWriteEntries(LinkedHashMap.java:333)
[INFO]  at java.util.HashMap.writeObject(HashMap.java:1354)
[INFO]  at sun.reflect.GeneratedMethodAccessor24.invoke(Unknown Source)
[INFO]  at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
[INFO]  at java.lang.reflect.Method.invoke(Method.java:498)
[INFO]  at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:1028)
[INFO]  at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1496)
[INFO]  at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1432)
[INFO]  at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1178)
[INFO]  at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1548)
[INFO]  at java.io.ObjectOutputStream.defaultWriteObject(ObjectOutputStream.java:441)
[INFO]  at java.util.Collections$SynchronizedMap.writeObject(Collections.java:2691)
[INFO]  at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[INFO]  at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
[INFO]  at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
[INFO]  at java.lang.reflect.Method.invoke(Method.java:498)
[INFO]  at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:1028)
[INFO]  at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1496)
[INFO]  at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1432)
[INFO]  at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1178)
[INFO]  at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:348)
[INFO]  at java.util.HashMap.internalWriteEntries(HashMap.java:1777)
[INFO]  at java.util.HashMap.writeObject(HashMap.java:1354)
[INFO]  at sun.reflect.GeneratedMethodAccessor24.invoke(Unknown Source)
[INFO]  at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
[INFO]  at java.lang.reflect.Method.invoke(Method.java:498)
[INFO]  at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:1028)
[INFO]  at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1496)
[INFO]  at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1432)
[INFO]  at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1178)
[INFO]  at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:348)
[INFO]  at com.google.apphosting.runtime.SessionManagerUtil.serialize(SessionManagerUtil.java:28)
[INFO]  at com.google.apphosting.runtime.DatastoreSessionStore.createEntityForSession(DatastoreSessionStore.java:73)
[INFO]  at com.google.apphosting.runtime.DatastoreSessionStore.saveSession(DatastoreSessionStore.java:112)
[INFO]  at com.google.apphosting.runtime.jetty9.SessionManager$AppEngineSession.save(SessionManager.java:145)
[INFO]  at com.google.apphosting.runtime.jetty9.SaveSessionFilter.doFilter(SaveSessionFilter.java:43)
[INFO]  at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652)
[INFO]  at com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:43)
[INFO]  at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652)
[INFO]  at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:585)
[INFO]  at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)
[INFO]  at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:553)
[INFO]  at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:223)
[INFO]  at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1127)
[INFO]  at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:515)
[INFO]  at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185)
[INFO]  at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1061)
[INFO]  at com.google.apphosting.vmruntime.jetty9.VmRuntimeWebAppContext.doScope(VmRuntimeWebAppContext.java:299)
[INFO]  at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
[INFO]  at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:215)
[INFO]  at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:110)
[INFO]  at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97)
[INFO]  at org.eclipse.jetty.server.Server.handle(Server.java:497)
[INFO]  at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:310)
[INFO]  at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:257)
[INFO]  at org.eclipse.jetty.io.AbstractConnection$2.run(AbstractConnection.java:540)
[INFO]  at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:635)
[INFO]  at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:555)
[INFO]  at java.lang.Thread.run(Thread.java:745)

Answer 1

如你所见：

[INFO]  at com.google.apphosting.runtime.SessionManagerUtil.serialize(SessionManagerUtil.java:28)
[INFO]  at com.google.apphosting.runtime.DatastoreSessionStore.createEntityForSession(DatastoreSessionStore.java:73)
[INFO]  at com.google.apphosting.runtime.DatastoreSessionStore.saveSession(DatastoreSessionStore.java:112)
[INFO]  at com.google.apphosting.runtime.jetty9.SessionManager$AppEngineSession.save(SessionManager.java:145)
[INFO]  at com.google.apphosting.runtime.jetty9.SaveSessionFilter.doFilter(SaveSessionFilter.java:43)

服务器正在尝试将MultiPartInputStreamParser放入用户会话(并保存到数据库)。你不该那样。