Pure Functional Json Parser Library.
Built on top of Gson minimal-json parser, it defines an encoder/decoder machinery.
It supports java records and the minimum required java version is Java 17.
If you are familiar with Gson, it will be pretty straightforward for you to use this library.
record User(int id, String name) {}
var json = """
{ "id": 1, "name": "toni" }
""".strip();
var user = new PureJson<>(User.class).fromJson(json);
assertEquals(new User(1, "toni"), user);PureJson supports runtime reflection and annotation processors. If an adapter exists for a specific type, then the adapter is used instead of reflection.
- Java POJOs: with empty constructor and setter/getters. Fields are populated using reflection.
- Java Value Objects: without empty constructor and setters (immutables). Constructor with parameters is used to create new instances.
- Java Records (Java 17+): canonical constructor is used to create new instances.
You can annotate your classes with @Json and an adapter for this class will be generated.
- Java Value Objects
- Java Records (Java 17+)
Tested on my laptop:
- cpu: Intel Core i7-1165G7
- ram: 64GB
- cores: 8
Performance parse pojo
name tot min max mean p50 p90 p95 p99
refl 60349 9 59 12 11 13 15 23
buil 16858 2 39 3 2 5 5 7
adho 14996 2 38 2 2 4 5 6
gson 10485 1 36 2 1 3 3 4
Performance parse record
name tot min max mean p50 p90 p95 p99
refl 16542 2 50 3 2 5 5 6
buil 16306 2 50 3 2 5 5 6
adho 17670 2 51 3 3 3 5 7
gson 13903 2 50 2 2 3 5 5
Performance serialize pojo
name tot min max mean p50 p90 p95 p99
refl 31824 5 22 6 6 6 8 11
buil 34202 3 25 6 6 10 11 12
adho 32495 4 21 6 6 7 10 11
gson 26533 4 18 5 5 6 6 6
Performance serialize record
name tot min max mean p50 p90 p95 p99
refl 33065 4 23 6 6 8 10 12
buil 33042 4 24 6 6 8 10 12
adho 32888 5 23 6 5 8 10 12
gson 27768 4 25 5 5 6 6 6