[jira] [Updated] (WICKET-6770) Serialization error when using Video

["Joachim Rohde (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/WICKET-6770?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Joachim Rohde updated WICKET-6770:
----------------------------------
    Description: 
When using
{code:java}
org.apache.wicket.markup.html.media.video.Video{code}
it can happen that a
{code:java}
NotSerializableException{code}
is thrown.

The problem exists at least since 12/2017: [https://stackoverflow.com/questions/47700614/error-serializing-object-in-wicket]

I have reproduced the error with Wicket 8.2.0, 8.7.0 and 9.0.0-M5

 

The exception

 
{noformat}
[Wicket-AsyncPageStore-PageSavingThread] ERROR org.apache.wicket.serialize.java.JavaSerializer - Error serializing object class com.wicket.video.demo.IndexPage [object=[Page class = com.wicket.video.demo.IndexPage, id = 0, render count = 1]] org.apache.wicket.core.util.objects.checker.CheckingObjectOutputStream$ObjectCheckException: The object type is not Serializable! A problem occurred while checking object with type: sun.nio.fs.UnixPath Field hierarchy is: 0 [class=com.wicket.video.demo.IndexPage, path=0] private java.lang.Object org.apache.wicket.MarkupContainer.children [class=java.util.ArrayList] private java.lang.Object org.apache.wicket.MarkupContainer.children[write:1] [class=com.wicket.video.demo.VideoCard, path=0:videoCard] private java.lang.Object org.apache.wicket.MarkupContainer.children [class=java.util.ArrayList] private java.lang.Object org.apache.wicket.MarkupContainer.children[write:1] [class=org.apache.wicket.markup.html.WebMarkupContainer, path=0:videoCard:wmc] private java.lang.Object org.apache.wicket.MarkupContainer.children [class=org.apache.wicket.markup.html.media.video.Video, path=0:videoCard:wmc:video] private final org.apache.wicket.request.resource.ResourceReference org.apache.wicket.markup.html.media.MediaComponent.resourceReference [class=org.apache.wicket.resource.FileSystemResourceReference] private java.nio.file.Path org.apache.wicket.resource.FileSystemResourceReference.path [class=sun.nio.fs.UnixPath] <----- field that is causing the problem at org.apache.wicket.core.util.objects.checker.CheckingObjectOutputStream.internalCheck(CheckingObjectOutputStream.java:371) at org.apache.wicket.core.util.objects.checker.CheckingObjectOutputStream.check(CheckingObjectOutputStream.java:354) at org.apache.wicket.core.util.objects.checker.CheckingObjectOutputStream.checkFields(CheckingObjectOutputStream.java:607) at org.apache.wicket.core.util.objects.checker.CheckingObjectOutputStream.internalCheck(CheckingObjectOutputStream.java:545) at org.apache.wicket.core.util.objects.checker.CheckingObjectOutputStream.check(CheckingObjectOutputStream.java:354) at org.apache.wicket.core.util.objects.checker.CheckingObjectOutputStream.checkFields(CheckingObjectOutputStream.java:607) at org.apache.wicket.core.util.objects.checker.CheckingObjectOutputStream.internalCheck(CheckingObjectOutputStream.java:545) at org.apache.wicket.core.util.objects.checker.CheckingObjectOutputStream.check(CheckingObjectOutputStream.java:354) at org.apache.wicket.core.util.objects.checker.CheckingObjectOutputStream.checkFields(CheckingObjectOutputStream.java:607) at org.apache.wicket.core.util.objects.checker.CheckingObjectOutputStream.internalCheck(CheckingObjectOutputStream.java:545) at org.apache.wicket.core.util.objects.checker.CheckingObjectOutputStream.check(CheckingObjectOutputStream.java:354) at org.apache.wicket.core.util.objects.checker.CheckingObjectOutputStream$1InterceptingObjectOutputStream.replaceObject(CheckingObjectOutputStream.java:501) at java.base/java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1145) at java.base/java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:349) at java.base/java.util.ArrayList.writeObject(ArrayList.java:896) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.base/java.lang.reflect.Method.invoke(Method.java:566) at java.base/java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:1130) at java.base/java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1497) at java.base/java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1433) at java.base/java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1179) at java.base/java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:349) at org.apache.wicket.core.util.objects.checker.CheckingObjectOutputStream.internalCheck(CheckingObjectOutputStream.java:509) at org.apache.wicket.core.util.objects.checker.CheckingObjectOutputStream.check(CheckingObjectOutputStream.java:354) at org.apache.wicket.core.util.objects.checker.CheckingObjectOutputStream.checkFields(CheckingObjectOutputStream.java:607) at org.apache.wicket.core.util.objects.checker.CheckingObjectOutputStream.internalCheck(CheckingObjectOutputStream.java:545) at org.apache.wicket.core.util.objects.checker.CheckingObjectOutputStream.check(CheckingObjectOutputStream.java:354) at org.apache.wicket.core.util.objects.checker.CheckingObjectOutputStream$1InterceptingObjectOutputStream.replaceObject(CheckingObjectOutputStream.java:501) at java.base/java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1145) at java.base/java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:349) at java.base/java.util.ArrayList.writeObject(ArrayList.java:896) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.base/java.lang.reflect.Method.invoke(Method.java:566) at java.base/java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:1130) at java.base/java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1497) at java.base/java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1433) at java.base/java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1179) at java.base/java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:349) at org.apache.wicket.core.util.objects.checker.CheckingObjectOutputStream.internalCheck(CheckingObjectOutputStream.java:509) at org.apache.wicket.core.util.objects.checker.CheckingObjectOutputStream.check(CheckingObjectOutputStream.java:354) at org.apache.wicket.core.util.objects.checker.CheckingObjectOutputStream.checkFields(CheckingObjectOutputStream.java:607) at org.apache.wicket.core.util.objects.checker.CheckingObjectOutputStream.internalCheck(CheckingObjectOutputStream.java:545) at org.apache.wicket.core.util.objects.checker.CheckingObjectOutputStream.check(CheckingObjectOutputStream.java:354) at org.apache.wicket.core.util.objects.checker.CheckingObjectOutputStream.writeObjectOverride(CheckingObjectOutputStream.java:711) at java.base/java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:345) at org.apache.wicket.serialize.java.JavaSerializer$SerializationCheckerObjectOutputStream.writeObjectOverride(JavaSerializer.java:382) at java.base/java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:345) at org.apache.wicket.serialize.java.JavaSerializer.serialize(JavaSerializer.java:83) at org.apache.wicket.pageStore.SerializingPageStore.addPage(SerializingPageStore.java:80) at org.apache.wicket.pageStore.AsynchronousPageStore$PageAddingRunnable.run(AsynchronousPageStore.java:278) at java.base/java.lang.Thread.run(Thread.java:834) Caused by: java.io.NotSerializableException: sun.nio.fs.UnixPath at java.base/java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1185) at java.base/java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1553) at java.base/java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1510) at java.base/java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1433) at java.base/java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1179) at java.base/java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1553) at java.base/java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1510) at java.base/java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1433) at java.base/java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1179) at java.base/java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1553) at java.base/java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1510) at java.base/java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1433) at java.base/java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1179) at java.base/java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:349) at java.base/java.util.ArrayList.writeObject(ArrayList.java:896) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.base/java.lang.reflect.Method.invoke(Method.java:566) at java.base/java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:1130) at java.base/java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1497) at java.base/java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1433) at java.base/java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1179) at java.base/java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1553) at java.base/java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1510) at java.base/java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1433) at java.base/java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1179) at java.base/java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:349) at java.base/java.util.ArrayList.writeObject(ArrayList.java:896) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.base/java.lang.reflect.Method.invoke(Method.java:566) at java.base/java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:1130) at java.base/java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1497) at java.base/java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1433) at java.base/java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1179) at java.base/java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1553) at java.base/java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1510) at java.base/java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1433) at java.base/java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1179) at java.base/java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:349) at org.apache.wicket.serialize.java.JavaSerializer$SerializationCheckerObjectOutputStream.writeObjectOverride(JavaSerializer.java:371) ... 5 more{noformat}
 

The problem can be reproduced when you add an AjaxLink (or any other Link) to the same page.

 

I wrote a quick start to reproduce the problem which can be found here: [https://github.com/JoachimRohde/WicketVideoSerializationExceptionDemo]

  was:
When using
{code:java}
org.apache.wicket.markup.html.media.video.Video{code}
it can happen that a
{code:java}
NotSerializableException{code}
is thrown.

The problem exists at least since 12/2017: [https://stackoverflow.com/questions/47700614/error-serializing-object-in-wicket]

I have reproduced the error with Wicket 8.2.0, 8.7.0 and 9.0.0-M5

 

The exception

 

{{}}
{noformat}
[Wicket-AsyncPageStore-PageSavingThread] ERROR org.apache.wicket.serialize.java.JavaSerializer - Error serializing object class com.wicket.video.demo.IndexPage [object=[Page class = com.wicket.video.demo.IndexPage, id = 0, render count = 1]] org.apache.wicket.core.util.objects.checker.CheckingObjectOutputStream$ObjectCheckException: The object type is not Serializable! A problem occurred while checking object with type: sun.nio.fs.UnixPath Field hierarchy is: 0 [class=com.wicket.video.demo.IndexPage, path=0] private java.lang.Object org.apache.wicket.MarkupContainer.children [class=java.util.ArrayList] private java.lang.Object org.apache.wicket.MarkupContainer.children[write:1] [class=com.wicket.video.demo.VideoCard, path=0:videoCard] private java.lang.Object org.apache.wicket.MarkupContainer.children [class=java.util.ArrayList] private java.lang.Object org.apache.wicket.MarkupContainer.children[write:1] [class=org.apache.wicket.markup.html.WebMarkupContainer, path=0:videoCard:wmc] private java.lang.Object org.apache.wicket.MarkupContainer.children [class=org.apache.wicket.markup.html.media.video.Video, path=0:videoCard:wmc:video] private final org.apache.wicket.request.resource.ResourceReference org.apache.wicket.markup.html.media.MediaComponent.resourceReference [class=org.apache.wicket.resource.FileSystemResourceReference] private java.nio.file.Path org.apache.wicket.resource.FileSystemResourceReference.path [class=sun.nio.fs.UnixPath] <----- field that is causing the problem at org.apache.wicket.core.util.objects.checker.CheckingObjectOutputStream.internalCheck(CheckingObjectOutputStream.java:371) at org.apache.wicket.core.util.objects.checker.CheckingObjectOutputStream.check(CheckingObjectOutputStream.java:354) at org.apache.wicket.core.util.objects.checker.CheckingObjectOutputStream.checkFields(CheckingObjectOutputStream.java:607) at org.apache.wicket.core.util.objects.checker.CheckingObjectOutputStream.internalCheck(CheckingObjectOutputStream.java:545) at org.apache.wicket.core.util.objects.checker.CheckingObjectOutputStream.check(CheckingObjectOutputStream.java:354) at org.apache.wicket.core.util.objects.checker.CheckingObjectOutputStream.checkFields(CheckingObjectOutputStream.java:607) at org.apache.wicket.core.util.objects.checker.CheckingObjectOutputStream.internalCheck(CheckingObjectOutputStream.java:545) at org.apache.wicket.core.util.objects.checker.CheckingObjectOutputStream.check(CheckingObjectOutputStream.java:354) at org.apache.wicket.core.util.objects.checker.CheckingObjectOutputStream.checkFields(CheckingObjectOutputStream.java:607) at org.apache.wicket.core.util.objects.checker.CheckingObjectOutputStream.internalCheck(CheckingObjectOutputStream.java:545) at org.apache.wicket.core.util.objects.checker.CheckingObjectOutputStream.check(CheckingObjectOutputStream.java:354) at org.apache.wicket.core.util.objects.checker.CheckingObjectOutputStream$1InterceptingObjectOutputStream.replaceObject(CheckingObjectOutputStream.java:501) at java.base/java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1145) at java.base/java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:349) at java.base/java.util.ArrayList.writeObject(ArrayList.java:896) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.base/java.lang.reflect.Method.invoke(Method.java:566) at java.base/java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:1130) at java.base/java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1497) at java.base/java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1433) at java.base/java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1179) at java.base/java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:349) at org.apache.wicket.core.util.objects.checker.CheckingObjectOutputStream.internalCheck(CheckingObjectOutputStream.java:509) at org.apache.wicket.core.util.objects.checker.CheckingObjectOutputStream.check(CheckingObjectOutputStream.java:354) at org.apache.wicket.core.util.objects.checker.CheckingObjectOutputStream.checkFields(CheckingObjectOutputStream.java:607) at org.apache.wicket.core.util.objects.checker.CheckingObjectOutputStream.internalCheck(CheckingObjectOutputStream.java:545) at org.apache.wicket.core.util.objects.checker.CheckingObjectOutputStream.check(CheckingObjectOutputStream.java:354) at org.apache.wicket.core.util.objects.checker.CheckingObjectOutputStream$1InterceptingObjectOutputStream.replaceObject(CheckingObjectOutputStream.java:501) at java.base/java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1145) at java.base/java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:349) at java.base/java.util.ArrayList.writeObject(ArrayList.java:896) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.base/java.lang.reflect.Method.invoke(Method.java:566) at java.base/java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:1130) at java.base/java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1497) at java.base/java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1433) at java.base/java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1179) at java.base/java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:349) at org.apache.wicket.core.util.objects.checker.CheckingObjectOutputStream.internalCheck(CheckingObjectOutputStream.java:509) at org.apache.wicket.core.util.objects.checker.CheckingObjectOutputStream.check(CheckingObjectOutputStream.java:354) at org.apache.wicket.core.util.objects.checker.CheckingObjectOutputStream.checkFields(CheckingObjectOutputStream.java:607) at org.apache.wicket.core.util.objects.checker.CheckingObjectOutputStream.internalCheck(CheckingObjectOutputStream.java:545) at org.apache.wicket.core.util.objects.checker.CheckingObjectOutputStream.check(CheckingObjectOutputStream.java:354) at org.apache.wicket.core.util.objects.checker.CheckingObjectOutputStream.writeObjectOverride(CheckingObjectOutputStream.java:711) at java.base/java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:345) at org.apache.wicket.serialize.java.JavaSerializer$SerializationCheckerObjectOutputStream.writeObjectOverride(JavaSerializer.java:382) at java.base/java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:345) at org.apache.wicket.serialize.java.JavaSerializer.serialize(JavaSerializer.java:83) at org.apache.wicket.pageStore.SerializingPageStore.addPage(SerializingPageStore.java:80) at org.apache.wicket.pageStore.AsynchronousPageStore$PageAddingRunnable.run(AsynchronousPageStore.java:278) at java.base/java.lang.Thread.run(Thread.java:834) Caused by: java.io.NotSerializableException: sun.nio.fs.UnixPath at java.base/java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1185) at java.base/java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1553) at java.base/java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1510) at java.base/java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1433) at java.base/java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1179) at java.base/java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1553) at java.base/java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1510) at java.base/java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1433) at java.base/java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1179) at java.base/java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1553) at java.base/java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1510) at java.base/java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1433) at java.base/java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1179) at java.base/java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:349) at java.base/java.util.ArrayList.writeObject(ArrayList.java:896) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.base/java.lang.reflect.Method.invoke(Method.java:566) at java.base/java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:1130) at java.base/java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1497) at java.base/java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1433) at java.base/java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1179) at java.base/java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1553) at java.base/java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1510) at java.base/java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1433) at java.base/java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1179) at java.base/java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:349) at java.base/java.util.ArrayList.writeObject(ArrayList.java:896) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.base/java.lang.reflect.Method.invoke(Method.java:566) at java.base/java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:1130) at java.base/java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1497) at java.base/java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1433) at java.base/java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1179) at java.base/java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1553) at java.base/java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1510) at java.base/java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1433) at java.base/java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1179) at java.base/java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:349) at org.apache.wicket.serialize.java.JavaSerializer$SerializationCheckerObjectOutputStream.writeObjectOverride(JavaSerializer.java:371) ... 5 more{noformat}
 

The problem can be reproduced when you add an AjaxLink (or any other Link) to the same page.

 

I wrote a quick start to reproduce the problem which can be found here: https://github.com/JoachimRohde/WicketVideoSerializationExceptionDemo


> Serialization error when using Video
> ------------------------------------
>
>                 Key: WICKET-6770
>                 URL: https://issues.apache.org/jira/browse/WICKET-6770
>             Project: Wicket
>          Issue Type: Bug
>          Components: wicket-core
>    Affects Versions: 9.0.0-M5
>            Reporter: Joachim Rohde
>            Priority: Minor
>
> When using
> {code:java}
> org.apache.wicket.markup.html.media.video.Video{code}
> it can happen that a
> {code:java}
> NotSerializableException{code}
> is thrown.
> The problem exists at least since 12/2017: [https://stackoverflow.com/questions/47700614/error-serializing-object-in-wicket]
> I have reproduced the error with Wicket 8.2.0, 8.7.0 and 9.0.0-M5
>  
> The exception
>  
> {noformat}
> [Wicket-AsyncPageStore-PageSavingThread] ERROR org.apache.wicket.serialize.java.JavaSerializer - Error serializing object class com.wicket.video.demo.IndexPage [object=[Page class = com.wicket.video.demo.IndexPage, id = 0, render count = 1]] org.apache.wicket.core.util.objects.checker.CheckingObjectOutputStream$ObjectCheckException: The object type is not Serializable! A problem occurred while checking object with type: sun.nio.fs.UnixPath Field hierarchy is: 0 [class=com.wicket.video.demo.IndexPage, path=0] private java.lang.Object org.apache.wicket.MarkupContainer.children [class=java.util.ArrayList] private java.lang.Object org.apache.wicket.MarkupContainer.children[write:1] [class=com.wicket.video.demo.VideoCard, path=0:videoCard] private java.lang.Object org.apache.wicket.MarkupContainer.children [class=java.util.ArrayList] private java.lang.Object org.apache.wicket.MarkupContainer.children[write:1] [class=org.apache.wicket.markup.html.WebMarkupContainer, path=0:videoCard:wmc] private java.lang.Object org.apache.wicket.MarkupContainer.children [class=org.apache.wicket.markup.html.media.video.Video, path=0:videoCard:wmc:video] private final org.apache.wicket.request.resource.ResourceReference org.apache.wicket.markup.html.media.MediaComponent.resourceReference [class=org.apache.wicket.resource.FileSystemResourceReference] private java.nio.file.Path org.apache.wicket.resource.FileSystemResourceReference.path [class=sun.nio.fs.UnixPath] <----- field that is causing the problem at org.apache.wicket.core.util.objects.checker.CheckingObjectOutputStream.internalCheck(CheckingObjectOutputStream.java:371) at org.apache.wicket.core.util.objects.checker.CheckingObjectOutputStream.check(CheckingObjectOutputStream.java:354) at org.apache.wicket.core.util.objects.checker.CheckingObjectOutputStream.checkFields(CheckingObjectOutputStream.java:607) at org.apache.wicket.core.util.objects.checker.CheckingObjectOutputStream.internalCheck(CheckingObjectOutputStream.java:545) at org.apache.wicket.core.util.objects.checker.CheckingObjectOutputStream.check(CheckingObjectOutputStream.java:354) at org.apache.wicket.core.util.objects.checker.CheckingObjectOutputStream.checkFields(CheckingObjectOutputStream.java:607) at org.apache.wicket.core.util.objects.checker.CheckingObjectOutputStream.internalCheck(CheckingObjectOutputStream.java:545) at org.apache.wicket.core.util.objects.checker.CheckingObjectOutputStream.check(CheckingObjectOutputStream.java:354) at org.apache.wicket.core.util.objects.checker.CheckingObjectOutputStream.checkFields(CheckingObjectOutputStream.java:607) at org.apache.wicket.core.util.objects.checker.CheckingObjectOutputStream.internalCheck(CheckingObjectOutputStream.java:545) at org.apache.wicket.core.util.objects.checker.CheckingObjectOutputStream.check(CheckingObjectOutputStream.java:354) at org.apache.wicket.core.util.objects.checker.CheckingObjectOutputStream$1InterceptingObjectOutputStream.replaceObject(CheckingObjectOutputStream.java:501) at java.base/java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1145) at java.base/java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:349) at java.base/java.util.ArrayList.writeObject(ArrayList.java:896) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.base/java.lang.reflect.Method.invoke(Method.java:566) at java.base/java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:1130) at java.base/java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1497) at java.base/java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1433) at java.base/java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1179) at java.base/java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:349) at org.apache.wicket.core.util.objects.checker.CheckingObjectOutputStream.internalCheck(CheckingObjectOutputStream.java:509) at org.apache.wicket.core.util.objects.checker.CheckingObjectOutputStream.check(CheckingObjectOutputStream.java:354) at org.apache.wicket.core.util.objects.checker.CheckingObjectOutputStream.checkFields(CheckingObjectOutputStream.java:607) at org.apache.wicket.core.util.objects.checker.CheckingObjectOutputStream.internalCheck(CheckingObjectOutputStream.java:545) at org.apache.wicket.core.util.objects.checker.CheckingObjectOutputStream.check(CheckingObjectOutputStream.java:354) at org.apache.wicket.core.util.objects.checker.CheckingObjectOutputStream$1InterceptingObjectOutputStream.replaceObject(CheckingObjectOutputStream.java:501) at java.base/java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1145) at java.base/java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:349) at java.base/java.util.ArrayList.writeObject(ArrayList.java:896) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.base/java.lang.reflect.Method.invoke(Method.java:566) at java.base/java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:1130) at java.base/java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1497) at java.base/java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1433) at java.base/java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1179) at java.base/java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:349) at org.apache.wicket.core.util.objects.checker.CheckingObjectOutputStream.internalCheck(CheckingObjectOutputStream.java:509) at org.apache.wicket.core.util.objects.checker.CheckingObjectOutputStream.check(CheckingObjectOutputStream.java:354) at org.apache.wicket.core.util.objects.checker.CheckingObjectOutputStream.checkFields(CheckingObjectOutputStream.java:607) at org.apache.wicket.core.util.objects.checker.CheckingObjectOutputStream.internalCheck(CheckingObjectOutputStream.java:545) at org.apache.wicket.core.util.objects.checker.CheckingObjectOutputStream.check(CheckingObjectOutputStream.java:354) at org.apache.wicket.core.util.objects.checker.CheckingObjectOutputStream.writeObjectOverride(CheckingObjectOutputStream.java:711) at java.base/java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:345) at org.apache.wicket.serialize.java.JavaSerializer$SerializationCheckerObjectOutputStream.writeObjectOverride(JavaSerializer.java:382) at java.base/java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:345) at org.apache.wicket.serialize.java.JavaSerializer.serialize(JavaSerializer.java:83) at org.apache.wicket.pageStore.SerializingPageStore.addPage(SerializingPageStore.java:80) at org.apache.wicket.pageStore.AsynchronousPageStore$PageAddingRunnable.run(AsynchronousPageStore.java:278) at java.base/java.lang.Thread.run(Thread.java:834) Caused by: java.io.NotSerializableException: sun.nio.fs.UnixPath at java.base/java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1185) at java.base/java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1553) at java.base/java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1510) at java.base/java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1433) at java.base/java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1179) at java.base/java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1553) at java.base/java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1510) at java.base/java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1433) at java.base/java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1179) at java.base/java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1553) at java.base/java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1510) at java.base/java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1433) at java.base/java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1179) at java.base/java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:349) at java.base/java.util.ArrayList.writeObject(ArrayList.java:896) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.base/java.lang.reflect.Method.invoke(Method.java:566) at java.base/java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:1130) at java.base/java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1497) at java.base/java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1433) at java.base/java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1179) at java.base/java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1553) at java.base/java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1510) at java.base/java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1433) at java.base/java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1179) at java.base/java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:349) at java.base/java.util.ArrayList.writeObject(ArrayList.java:896) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.base/java.lang.reflect.Method.invoke(Method.java:566) at java.base/java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:1130) at java.base/java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1497) at java.base/java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1433) at java.base/java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1179) at java.base/java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1553) at java.base/java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1510) at java.base/java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1433) at java.base/java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1179) at java.base/java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:349) at org.apache.wicket.serialize.java.JavaSerializer$SerializationCheckerObjectOutputStream.writeObjectOverride(JavaSerializer.java:371) ... 5 more{noformat}
>  
> The problem can be reproduced when you add an AjaxLink (or any other Link) to the same page.
>  
> I wrote a quick start to reproduce the problem which can be found here: [https://github.com/JoachimRohde/WicketVideoSerializationExceptionDemo]



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