Merge Java Library

The Merge Java library provides convenient access to the Merge API from Java.

Documentation

API documentation is available at here.

Installation

Gradle

Add the dependency in your build.gradle:

dependencies {
    implementation 'dev.merge:merge-java-client:0.x.x'
}

Maven

Add the dependency in your pom.xml:

<dependency>
    <groupId>dev.merge</groupId>
    <artifactId>merge-java-client</artifactId>
    <version>0.x.x</version>
</dependency>

Instantiation

MergeApiClient mergeClient = MergeApiClient.builder()
    .accountToken("ACCOUNT_TOKEN")
    .apiKey("API_KEY")
    .build();

Request Options

Every endpoint has an overloaded equivalent which takes RequestOptions that allow you to override the account token and api key.

import com.merge.api.MergeApiClient;
import com.merge.api.resources.ats.types.Candidate;
import com.merge.api.resources.ats.candidates.requests.CandidatesRetrieveRequest;
import com.merge.api.core.RequestOptions;

MergeApiClient mergeClient = MergeApiClient.builder()
    .accountToken("ACCOUNT_TOKEN")
    .apiKey("API_KEY")
    .build();

Candidate candidate = mergeClient.ats().candidates().retrieve(
    "<CANDIDATE_UUID>", 
    CandidatesRetrieveRequest.builder()
            .includeRemoteData(true)
            .build(), 
    RequestOptions.builder()
        .accountToken("OVERRIDE_ACCOUNT_TOKEN")
        .build());

Usage

Instantiate and use the client with the following:

package com.example.usage;

import com.merge.api.MergeApiClient;
import com.merge.api.ats.types.ActivityEndpointRequest;
import com.merge.api.ats.types.ActivityRequest;

public class Example {
    public static void main(String[] args) {
        MergeApiClient client = MergeApiClient
            .builder()
            .apiKey("<token>")
            .build();

        client.ats().activities().create(
            ActivityEndpointRequest
                .builder()
                .model(
                    ActivityRequest
                        .builder()
                        .build()
                )
                .remoteUserId("remote_user_id")
                .build()
        );
    }
}

Environments

This SDK allows you to configure different environments for API requests.

import com.merge.api.MergeApiClient;
import com.merge.api.core.Environment;

MergeApiClient client = MergeApiClient
    .builder()
    .environment(Environment.Production)
    .build();

Base Url

You can set a custom base URL when constructing the client.

import com.merge.api.MergeApiClient;

MergeApiClient client = MergeApiClient
    .builder()
    .url("https://example.com")
    .build();

Exception Handling

When the API returns a non-success status code (4xx or 5xx response), an API exception will be thrown.

import com.merge.api.core.ApiError;

try {
    client.ats().activities().create(...);
} catch (ApiError e) {
    // Do something with the API exception...
}

Advanced

Custom Client

This SDK is built to work with any instance of OkHttpClient. By default, if no client is provided, the SDK will construct one. However, you can pass your own client like so:

import com.merge.api.MergeApiClient;
import okhttp3.OkHttpClient;

OkHttpClient customClient = ...;

MergeApiClient client = MergeApiClient
    .builder()
    .httpClient(customClient)
    .build();

Retries

The SDK is instrumented with automatic retries with exponential backoff. A request will be retried as long as the request is deemed retryable and the number of retry attempts has not grown larger than the configured retry limit (default: 2).

A request is deemed retryable when any of the following HTTP status codes is returned:

• 408 (Timeout)
• 429 (Too Many Requests)
• 5XX (Internal Server Errors)

Use the maxRetries client option to configure this behavior.

import com.merge.api.MergeApiClient;

MergeApiClient client = MergeApiClient
    .builder()
    .maxRetries(1)
    .build();

Timeouts

The SDK defaults to a 60 second timeout. You can configure this with a timeout option at the client or request level.

import com.merge.api.MergeApiClient;
import com.merge.api.core.RequestOptions;

// Client level
MergeApiClient client = MergeApiClient
    .builder()
    .timeout(10)
    .build();

// Request level
client.ats().activities().create(
    ...,
    RequestOptions
        .builder()
        .timeout(10)
        .build()
);

Staged Builders

The generated builders all follow the staged builder pattern. Read more here.

Staged builders only allow you to build the object once all required properties have been specified. For example, to build an ApplicationEndpointRequest the Merge SDK will require that you specify the model and remoteUserId properties.

Contributing

While we value open-source contributions to this SDK, this library is generated programmatically. Additions made directly to this library would have to be moved over to our generation code, otherwise they would be overwritten upon the next generated release. Feel free to open a PR as a proof of concept, but know that we will not be able to merge it as-is. We suggest opening an issue first to discuss with us!

On the other hand, contributions to the README are always very welcome!