We have a large wicket application that has an annoying bug. We have a form with a file upload field on it, and for the most part it works fine. The only time it fails is when the user has opened multiple browser tabs. Then we get the following exception (once for each extra tab opened):
java.lang.RuntimeException: Could not deserialize object from byte[]
at org.apache.wicket.serialize.java.JavaSerializer.deserialize(JavaSerializer.java:143)
at org.apache.wicket.pageStore.AbstractPageStore.deserializePage(AbstractPageStore.java:152)
at org.apache.wicket.pageStore.AbstractCachingPageStore.getPage(AbstractCachingPageStore.java:67)
at com.sw.system4.ui.RemovablePageManagerProvider$1.getPage(RemovablePageManagerProvider.java:51)
at org.apache.wicket.page.PageStoreManager$SessionEntry.getPage(PageStoreManager.java:231)
at org.apache.wicket.page.PageStoreManager$PersistentRequestAdapter.getPage(PageStoreManager.java:393)
at org.apache.wicket.page.AbstractPageManager.getPage(AbstractPageManager.java:82)
at org.apache.wicket.page.PageManagerDecorator.getPage(PageManagerDecorator.java:50)
at org.apache.wicket.page.PageAccessSynchronizer$2.getPage(PageAccessSynchronizer.java:246)
at org.apache.wicket.DefaultMapperContext.getPageInstance(DefaultMapperContext.java:113)
at org.apache.wicket.core.request.handler.PageProvider.getStoredPage(PageProvider.java:299)
at org.apache.wicket.core.request.handler.PageProvider.isNewPageInstance(PageProvider.java:211)
at org.apache.wicket.core.request.mapper.AbstractBookmarkableMapper.checkExpiration(AbstractBookmarkableMapper.java:335)
at org.apache.wicket.core.request.mapper.AbstractBookmarkableMapper.processListener(AbstractBookmarkableMapper.java:309)
at org.apache.wicket.core.request.mapper.AbstractBookmarkableMapper.mapRequest(AbstractBookmarkableMapper.java:369)
at org.apache.wicket.request.mapper.CompoundRequestMapper.mapRequest(CompoundRequestMapper.java:147)
at org.apache.wicket.request.cycle.RequestCycle.resolveRequestHandler(RequestCycle.java:189)
at org.apache.wicket.request.cycle.RequestCycle.processRequest(RequestCycle.java:219)
at org.apache.wicket.request.cycle.RequestCycle.processRequestAndDetach(RequestCycle.java:293)
at org.apache.wicket.protocol.http.WicketFilter.processRequestCycle(WicketFilter.java:261)
at org.apache.wicket.protocol.http.WicketFilter.processRequest(WicketFilter.java:203)
at org.apache.wicket.protocol.http.WicketFilter.doFilter(WicketFilter.java:284)
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:505)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:169)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:956)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:423)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1079)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:625)
at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.doRun(AprEndpoint.java:2517)
at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:2506)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Unknown Source)
Caused by: java.io.FileNotFoundException: C:\Program Files\Apache Software Foundation\Tomcat 7.0\temp\upload_d17f019a_9bfa_48c5_bc2c_6fc0bf74d233_00004982.tmp (The system cannot find the file specified)
at java.io.FileInputStream.open0(Native Method)
at java.io.FileInputStream.open(Unknown Source)
at java.io.FileInputStream.(Unknown Source)
at org.apache.commons.fileupload.disk.DiskFileItem.readObject(DiskFileItem.java:684)
at sun.reflect.GeneratedMethodAccessor4472.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at java.io.ObjectStreamClass.invokeReadObject(Unknown Source)
at java.io.ObjectInputStream.readSerialData(Unknown Source)
at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source)
at java.io.ObjectInputStream.readObject0(Unknown Source)
at java.io.ObjectInputStream.defaultReadFields(Unknown Source)
... lots of read lines snipped
at java.io.ObjectInputStream.readSerialData(Unknown Source)
at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source)
at java.io.ObjectInputStream.readObject0(Unknown Source)
at java.io.ObjectInputStream.readObject(Unknown Source)
at org.apache.wicket.serialize.java.JavaSerializer.deserialize(JavaSerializer.java:126)
The FileUploadField is in a form that is part of a bigger page, so the user selects a file and uploads it with an ajax submit button before moving on.
Form<?> uploadForm = new Form<Void>( "uploadForm" );
uploadForm.setMultiPart( true );
add( uploadForm );
IModel<List<FileUpload>> filesModel = Model.ofList( new ArrayList<>() );
uploadForm.add( new FileUploadField( "uploadField", filesModel) );
uploadForm.add( new AjaxBeforeSubmitLink( "loadLink" ) {
private static final long serialVersionUID = 1L;
@Override
protected void onSubmit( AjaxRequestTarget target, Form<?> form ) {
List<? extends FileUpload> files = filesModel.getObject();
if ( l_files != null && !l_files.isEmpty() ) {
callEntryModel.getObject().getVendorQuoteData().getFileUploads().addAll( files );
}
target.add( getUploadedFilesLabel() );
target.add( getClearFilesLink() );
onUpdateContractQuoteData( target );
}
});
The upload panel is part of a 'breadcrumb' style page using the BreadCrumbPanels from wicket extensions. The upload part is on a panel that is then replaced with the next panel in the breadcrumb. It is on that panel when they try to do anything that results in an ajax call that the error occurs.
From what I can tell, there is some sort of hashing function of the client request to define the name of the temporary file to load, which is different for different tabs? Has anyone else had this problem, I can't seem to find any references to it anywhere.
We are using Java 8/Wicket 7.10
Thanks in advance
It seems you keep a reference to FileItem object in your page.
Wicket tries to deserialize the page from its page store and during this process it tries to load a org.apache.commons.fileupload.disk.DiskFileItem for which there is no backing file anymore.
Wicket's FileUploadField has a transient field - a List<FileUpload>. But since it is transient it won't be serialized at all. Later when its public List<FileUpload> getFileUploads() is called this field will be null and Wicket will use commons-fileupload APIs to load it again.
To me it seems that your application keeps a reference to the DiskFileItem somewhere and because of this it is serialized/deserialized.
You can use Wicket IObjectChecker to find where it is being referenced. See SessionChecker and DifferentPageChecker for inspiration how to implement a custom checker.