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Allow use of `java.nio.file.Path` for `readValue()`, `writeValue()`

See original GitHub issue

Version 2.9.5 There is no out of box method to read from Path and write to Path, it will be usefull to make these methods.

Issue Analytics

  • State:closed
  • Created 5 years ago
  • Reactions:5
  • Comments:17 (10 by maintainers)

github_iconTop GitHub Comments

michaelhixsoncommented, Feb 18, 2021

Ideally the new methods would not use Path#toFile() because that method throws UnsupportedOperationException if the path is not on the default file system. Examples of non-default file systems include zip file systems and in-memory file systems.

I maintain an application that uses Jackson to interact with both of those types of file systems. If you added methods that accept Path objects but invoke toFile() on them, I wouldn’t be able to use any of those methods.

I’d think it would be better if the Path-accepting methods delegate to {Input,Output}Stream-accepting ones. For example:

public void writeValue(Path resultPath, Object value) throws IOException, JsonGenerationException, JsonMappingException {
    try (OutputStream out = Files.newOutputStream(resultPath)) {
        writeValue(out, value);
sdoeringNewcommented, Feb 22, 2021

I’ve started with 3.0 and added pull requests for jackson-core and jackson-databind.

I’m unsure about adding it to 2.13, though. It would be a half-heartedly support for Path after the JDK has the nio-package (“new” IO) for ten years now. This issue had the 3.0-label three years and it still can be 3.0. 😏

But if you say so I’ll add it “workaround-ish” to 2.13.

Read more comments on GitHub >

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