Improve error message to show in the first line an understandable error message

[WolfgangHG]

This is from Eclipse 2021-12 (4.22): this xml snippet causes two validation errors:

<application xmlns="https://jakarta.ee/xml/ns/jakartaee"
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="https://jakarta.ee/xml/ns/jakartaee https://jakarta.ee/xml/ns/jakartaee/application_9.xsd">
	<invalid>
	</invalid>
</application>

The "Language Servers" section shows only the headers of the error message, in my sample "Attribute:" and "Invalid element name".

The other two errors seem to result from the WTP XML validator.

Copying the details shows the full error:

Attribute:
 - version
is required in element:
 - application

And:

Invalid element name:
 - invalid

One of the following is expected:
 - application-name
 - description
 - display-name
 - icon
 - initialize-in-order
 - module

So, the "Markers" views should either remove the newlines or display multiline texts.

Hope this is the right place to report this issue.

[angelozerr]

I close this issue since its à lsp client issue with eclipse ide and i suppose lsp4e. See https://github.com/eclipse/wildwebdeveloper/issues/761

[WolfgangHG]

@angelozerr This issue was originally https://github.com/eclipse/wildwebdeveloper/issues/761 and then moved to this project. So #761 is now closed, too. Could you reopen and move this issue to the new project?

[angelozerr]

Oh I see. @mickaelistria this issue is for lsp4e or perhaps eclipse ui marker. The problem here is that diagnostic display a readable message with line sperator and marker view shows only the first line. This problem is not linked to lemminx but to marker view.

[mickaelistria]

Could the diagnoatic be enhanced to have a more explicit 1st line then? Multiple lines can be too intrusive eg also for cases of inline diagnostics. 1st line should be a summary of the issue and not 1st line of details.

[angelozerr]

We manage this diagnostic kind to have readable error message:

I don't know if we could add more content in the first line to keep this readable message.

[mickaelistria]

A summary could be Element "invalid" is invalid here according to schema and then next lines can provide details.

[angelozerr]

@fbricon what do you think about that?

[fbricon]

+1

[angelozerr]

@JessicaJHee are you interested in working on this issue?

[JessicaJHee]

I'm interested!