I need to generate json schema from my POJOs. The requirement is that every POJO must be exported as a separate file and the references inside the json schema must be handled appropriately. It means that the library should keep track of which POJO is exported to which file. I found this library: https://github.com/mbknor/mbknor-jackson-jsonSchema and it works fine but it seems (or at least i cannot find such option) that i can't accomplish the requirements without custom coding. Do you know any other library that supports this?
You can use Jackson to generate the JSON schema using the following maven dependencies
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.9.8</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.module</groupId>
<artifactId>jackson-module-jsonSchema</artifactId>
<version>2.9.8</version>
</dependency>
<dependency>
<groupId>org.reflections</groupId>
<artifactId>reflections</artifactId>
<version>0.9.11</version>
</dependency>
You can then generate the schema by writing something like this
public static void main(String[] args) throws IOException {
ObjectMapper mapper = new ObjectMapper();
JsonSchemaGenerator schemaGen = new JsonSchemaGenerator(mapper);
Reflections reflections = new Reflections("my.pojo.model",new SubTypesScanner(false));
Set<Class<?>> pojos = reflections.getSubTypesOf(Object.class);
Map<String, String> schemaByClassNameMap = pojos.stream()
.collect(Collectors.toMap(Class::getSimpleName, pojo -> getSchema(mapper, schemaGen, pojo)));
schemaByClassNameMap.entrySet().forEach(schemaByClassNameEntry->writeToFile(schemaByClassNameEntry.getKey(),schemaByClassNameEntry.getValue()));
}
private static void writeToFile(String pojoClassName, String pojoJsonSchema) {
try {
Path path = Paths.get(pojoClassName + ".json");
Files.deleteIfExists(path);
byte[] strToBytes = pojoJsonSchema.getBytes();
Files.write(path, strToBytes);
}catch (Exception e){
throw new IllegalStateException(e);
}
}
private static String getSchema(ObjectMapper mapper,JsonSchemaGenerator schemaGenerator,Class clazz){
try {
JsonSchema schema = schemaGenerator.generateSchema(clazz);
return mapper.writerWithDefaultPrettyPrinter().writeValueAsString(schema);
}catch (Exception e){
throw new IllegalStateException(e);
}
}
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