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https://issues.apache.org/jira/browse/WICKET-6425?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Martin Grigorov resolved WICKET-6425.
-------------------------------------
Resolution: Not A Problem
This is by Servlet 3 specification.
The javadoc of javax.servlet.http.Part says:
{code}
/**
* A convenience method to write this uploaded item to disk.
*
* <p>This method is not guaranteed to succeed if called more than once for
* the same part. This allows a particular implementation to use, for
* example, file renaming, where possible, rather than copying all of the
* underlying data, thus gaining a significant performance benefit.
*
* @param fileName the name of the file to which the stream will be
* written. The file is created relative to the location as
* specified in the MultipartConfig
*
* @throws IOException if an error occurs.
*/
public void write(String fileName) throws IOException;
{code}.
"The file is created relative to the location as specified in the
MultipartConfig".
Servlet 3 file uploads have many restrictions compared to commons-fileupload :-/
> ServletPartFileItem saves file to wrong location
> ------------------------------------------------
>
> 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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