How to make SequenceWriter append rootValueSeparator also at the end

[Jakub Liska]

Hey,

I'm writing json objects to file as lines this way : 

        ObjMapper
          .writer()
          .withRootValueSeparator("\n")
          .writeValues(new BufferedWriter(new OutputStreamWriter(new FileOutputStream(file, true), StandardCharsets.UTF_8), 524288))
          .writeAll(recs)

Which would be OK if I didn't write multiple times to the same file because the separator is not used at the end, if I write to a file 3 lines this way multiple times I get : 

{}

{}

{}{}

{}

{}{}

{}

{}{}

{}

{}{}

 

Is there a setting for this? Or I have to do it manually by writing "\n" to the outputstream?

[Tatu Saloranta]

As the name indicates, separator is only used between values, and there is no option to force it in the end. I don't know how easy it'd be to add an option to also add separator before `close()`; may be worth filing an issue.

However, you should be able to write this into output stream through Jackson API. Methods `writeRaw()` and `writeRawValue()` might both work for this particular purpose: if using `writeRaw()`, you would write separator String itself; if using `writeRawValue()`, I think you would try to write empty String as it would add separator before (since call implies that you are writing a pre-encoded JSON value and thereby a separator is needed).

-+ Tatu +-

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