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https://issues.apache.org/jira/browse/WICKET-6425?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16097395#comment-16097395
]
Richard Eckart de Castilho commented on WICKET-6425:
----------------------------------------------------
Can you give me a tip how to force commons-upload into not returning any items
in a plain Wicket-only example? Because that is necessary in order to enter the
fallback-branch that uses the Servlet 3 API:
**MultipartServletWebRequestImpl**
```
// try to parse the file uploads by using Apache
Commons FileUpload APIs
// because they are feature richer (e.g. progress
updates, cleaner)
items = fileUpload.parseRequest(new
ServletRequestContext(request));
if (items.isEmpty())
{
// fallback to Servlet 3.0 APIs
items = readServlet3Parts(request);
}
```
The application where I am originally hitting the problem is a Spring Boot
application which enters into that part of the Wicket code. I have tried
reproducing the issue with a plain Wicket application generated from the Wicket
Maven archetype, but it does not enter into that branch.
> For disk-cached downloads, FileUpload.writeToTempFile() points to an empty
> file
> -------------------------------------------------------------------------------
>
> Key: WICKET-6425
> URL: https://issues.apache.org/jira/browse/WICKET-6425
> Project: Wicket
> Issue Type: Bug
> Affects Versions: 7.8.0
> Reporter: Richard Eckart de Castilho
>
> ServletPartFileItem.write() receives an absolute path to a temporary location
> from FileUpload.writeToTempFile(). However, it discards the full path and
> passes on only the file name itself.
> {noformat}
> @Override
> public void write(File file) throws Exception
> {
> part.write(file.getName());
> }
> {noformat}
> So "file" here is an absolute location to a temporary file in the temp folder.
> Next, Tomcat's ApplicationPart.write() turns `file.getName()` back into a
> file which is now relative to the current working directory.
> Thus, the downloaded file never ends up in the location requested by
> FileUpload.writeToTempFile().
> Relevant stack
> {noformat}
> Daemon Thread [http-nio-8080-exec-5] (Suspended)
> owns: NioEndpoint$NioSocketWrapper (id=137)
> DiskFileItem.write(File) line: 388
> ApplicationPart.write(String) line: 120
> ServletPartFileItem.write(File) line: 140
> FileUpload.writeTo(File) line: 234
> FileUpload.writeToTempFile() line: 254
> ...
> {noformat}
> Using Tomcat 8.5.16, Wicket 7.8.0
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