Adding vaadin-grid-exporter to my project forces RestTemplate to add xml accept headers

[xhayot]

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What is/are your question(s)?

Since I added vaadin-grid-exporter to my project, my RestTemplate adds XML format in accept headers. With vaadin-grid-exporter in my dependencies : o.s.web.client.RestTemplate : Accept=[application/xml, text/xml, application/json, application/*+xml, application/*+json] Without vaadin-grid-exporter in my dependencies : o.s.web.client.RestTemplate : Accept=[application/json, application/*+json]

I don't understand why and it's problematic when I'm pushing data to my Webservice. "status":415,"error":"Unsupported Media Type","message":"Content-Type 'application/xml;charset=UTF-8' is not supported."

Is there any workaround I could implement to prevent this or would it be blocking for vaadin-grid-exporter ?

Thanks in advance !

Additional information

No response

[xhayot]

I figured a workaround by forcing MappingJackson2HttpMessageConverter as the only message converter in my rest template configuration : public RestTemplate getRestTemplate() { return new RestTemplateBuilder().messageConverters(Collections.singletonList(new MappingJackson2HttpMessageConverter())).build(); } vaadin-grid-exporter works fine after that adjustment, I'm going to test a bit more to make sure but it seems to be ok.

[xhayot]

Tested with all export formats :

• No idea if it could be related (don't think so) but I'm unable to get any export preview.
• Final exports are fine

[AB-xdev]

This is likely a Spring Boot specific problem.

By default RestTemplate automatically searches for available "converters" by checking if the classes are present. This is also documented on the default constructor:

Create a new instance of the RestTemplate using default settings. Default HttpMessageConverters are initialized.

GridExporter brings dynamicreports-core -> jasperreports -> jackson-dataformat-xml which then enables the XML converter when using the default constructor.

Depending on how you get the RestTemplate you can simply - as you have already written above - create a RestTemplate using the List<HttpMessageConverter<?>>-constructor which is the solution to this problem.

Spring does exactly this e.g. inside the spring-security-oauth2-client.

You can also try to exclude the jackson-dataformat-xml however this might break JasperReports and through that the exports.

[AB-xdev]

Tested with all export formats :

• No idea if it could be related (don't think so) but I'm unable to get any export preview.
• Final exports are fine

Exports should be unaffected since the component does not use any Spring specific stuff.

[xhayot]

Tested with all export formats :

• No idea if it could be related (don't think so) but I'm unable to get any export preview.
• Final exports are fine

Exports should be unaffected since the component does not use any Spring specific stuff.

Exports are fine, what could explain the fact that I can't get any preview though ?

[AB-xdev]

Exports are fine, what could explain the fact that I can't get any preview though?

This depends on what the browser can render/preview. PDFs can usually be previewed however Office specific formats like Excel, Word or PowerPoint documents are usually not supported.