Tomcat Spring Rest Wrong Encoding

Question

currently, I am working on a Spring Rest Endpoint (not Spring Boot) which I deploy to a Tomcat Servlet Container. It takes a Multipart form

@PostMapping(value = "/audit/{auditNumber}/file", consumes = MediaType.MULTIPART_FORM_DATA_VALUE) public ResponseEntity<?> uploadFileForAudit(// @PathVariable String peNumber, // @RequestParam("category") String category, // @RequestParam("documents") MultipartFile file, // @RequestParam("description") String description, // @RequestHeader Map<String, String> headers) { System.out.println("category "+category); System.out.println("description "+description);

When German Umlauts are sent as category or description, the console output looks like this:

category PrÃ¼fungsanordnung description Ã¶Ã¤Ã¼

I have other Rest Resources, but they are working. Somehow this Resource has the wrong encoding. I suspect the Multipart-form to be the problem.

The frontend is not the problem. I can use JavaScript fetch or Postman and both have the same result.

Any hint is appreciated.

muhammed ozbilici · Accepted Answer · 2022-11-23 17:18:16Z

For PostMapping you can't use URIEncoding="UTF-8" so instead of that you can define a filter to tell Tomcat that your request encoding is UTF-8, either you can add this to web.xml:

<filter> <filter-name>encodingFilter</filter-name> <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class> <init-param> <param-name>encoding</param-name> <param-value>UTF-8</param-value> </init-param> <init-param> <param-name>forceEncoding</param-name> <param-value>true</param-value> </init-param> </filter> <filter-mapping> <filter-name>encodingFilter</filter-name> <url-pattern>/*</url-pattern> </filter-mapping>

or add this filter :

public class EncodingFilter implements Filter { private String encoding = "UTF-8"; public void destroy() { } public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException { request.setCharacterEncoding(encoding); response.setCharacterEncoding(encoding); chain.doFilter(request, response); } public void init(FilterConfig config) throws ServletException { if (config.getInitParameter("encoding") != null) { encoding = config.getInitParameter("encoding"); } } }

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