jackson json question

[mild galleon]

suppose i have json array stored inside the file in the projects variable.
how can i update it properly without rewriting it?

[floral moss]

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[civic briar]

You can not update contents of a file without rewriting the contents of a file.

Vice versa, if you do not change the file you do not update the file.

[mild galleon]

well then, what would be the recommended way to do that with jackson? how can i just update it

[civic briar]

Is it a static file?

[mild galleon]

static file?

[civic briar]

I mean: Are you sure the file exists?

[mild galleon]

yes

[civic briar]

Try

ObjectMapper om = new ObjectMapper();
var root = om.readValue(projects.toFile(), JsonNode.class);
//change the contents of the root according to your update
FileWriter fw = new FileWriter(projects.toFile());
fw.write(om.writeValueAsString(root));
fw.close();```

[mild galleon]

@civic briar thanks it works, any idea if Path can be converted from string with jackson?

[floral moss]

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[mild galleon]

i want to deserialize some json to this object:

and im doing it like this:

[civic briar]

Hm, is this a different question?

[mild galleon]

well its unrelated to my first question

do i need to make new thread

[tawdry sage]

I mean, Jackson could serialize Path just fine. I did it just now.

[mild galleon]

where the hell is the problem then

[tawdry sage]

No idea, this code works for me:

        ObjectMapper om = new ObjectMapper();
        var a = om.readValue("{\"p\":\"file:///C:/Users/basdfa/Downloads\"}", A.class);
        System.out.println(a.p);