Ranked by the provider's API Evangelist rating — the Kin Score is scored per provider, not per API, so every API of a provider shares its band. How the rating works →

Exemplar 14 Complete, well-documented, and agent-ready

Automation Anywhere Package SDKThe Automation Anywhere Package SDK is a Java-based development toolkit that enables developers to build cu...76.7 Scalar SDKsScalar SDKs generates type-safe client libraries from OpenAPI specifications. Supported languages include T...76.4 Moov Backend SDKsMoov provides official server-side client libraries for interacting with the Moov API across multiple progr...75.9 Veeva Vault Java SDKThe Veeva Vault Java SDK (VAPIL) is an open-source Java-based REST API client for the Vault REST API. Provi...75.2 Clerk Java SDKOfficial Java SDK for the Clerk Backend API.73.1 Infor XtendM3 APIInfor XtendM3 provides a Java SDK for extending and customizing Infor M3 (CloudSuite Industrial) business l...71.0 Appian Suite APIThe Appian Suite API provides Java-based access to platform capabilities for managing processes, documents,...70.7 MATLAB Engine API for JavaExecute MATLAB functions from Java programs and exchange data between Java and MATLAB.68.8 Bank Sample (Java)Sample implementation of the Token Bank Integration API in Java.67.9 Merchant Sample (Java)Java merchant checkout sample illustrating Token.io payment initiation flows.67.9 Personal Finance Management Sample (Java)Simple personal finance app illustrating Token.io's Access Tokens for AIS use cases.67.9 JDBC Driver for SQL ServerJDBC driver for connecting Java applications to SQL Server.67.0 Microsoft JDBC Driver for SQL ServerType 4 JDBC driver providing database connectivity to SQL Server through standard JDBC application program ...67.0 Neo4j Java DriverThe Neo4j Java Driver is the official library for connecting Java applications to Neo4j graph databases. Di...66.6

Strong 7 Solid coverage with minor gaps

Azure Migrate Web Apps Assessment APIDiscover and assess on-premises ASP.NET and Java web apps running on IIS and Tomcat for migration to Azure ...66.4 Red5 Pro Android Streaming SDKThe Red5 Pro Android Streaming SDK is a native Android library for integrating real-time live streaming pub...63.8 Gemini Java SDKJava client library for the Gemini API, providing an interface for developers to integrate Google generativ...61.7 Commercetools Java SDKThe commercetools Java SDK is the official client library for accessing the Composable Commerce APIs from J...61.5 Dagger SDKsNative SDKs for Go, Python, TypeScript, PHP, Java, .NET, Elixir, and Rust that generate strongly typed clie...58.9 DataHub Java SDKJava client for interacting with DataHub. The io.acryl datahub-client package offers REST emitter APIs that...57.4 Wowza Streaming Engine Java APINative Java API for extending and customizing the Wowza Streaming Engine media server via server listeners,...57.0

Developing 19 Usable, with meaningful gaps to close

Real-Time Java SDKJava SDK encompassing the Enterprise Message API (EMA) and Enterprise Transport API (ETA) for building high...53.3 Oracle Database JDBCJava Database Connectivity API for Oracle Database.50.3 Essbase Java APIJava API for developing applications that interact with Oracle Essbase for data loading, calculations, and ...48.9 turbopuffer Java SDKOfficial Java / Kotlin client library for the turbopuffer REST API, Stainless-generated from the public Ope...48.0 Apache Iceberg Java APIThe Iceberg Java API provides programmatic access to table operations, schema management, partition managem...47.3 Braintree Android SDKThe Braintree Android SDK provides a native library for integrating payment acceptance into Android applica...44.7 WebLogic JMX APIJava Management Extensions API for programmatic management and monitoring of WebLogic Server.44.0 Refinitiv Real-Time SDK - JavaOpen source Java SDK for the Refinitiv Real-Time platform, containing the Enterprise Message API (EMA) for ...43.3 Signal libsignal SDKThe libsignal SDK provides platform-agnostic APIs used by the official Signal clients and server. It implem...43.2 Apache Struts REST PluginThe Struts REST Plugin provides a convention-based REST API framework for building RESTful services. It map...42.7 Apache Dubbo Java SDKThe core Apache Dubbo Java framework providing RPC service definition, publishing, invocation, and service ...42.3 HashiCorp Nomad Java SDKThe Nomad Java SDK is an official Java client library for the HashiCorp Nomad HTTP API. It enables Java and...40.7 Apache Tomcat JMX APIThe Tomcat JMX API exposes management and monitoring beans for Connectors, Engines, Hosts, Contexts, Sessio...40.5 GOV.UK Notify Java ClientOfficial Java client library for the GOV.UK Notify API, providing methods for sending emails, SMS messages,...40.5 Mercado Pago Java SDKOfficial Java SDK wrapping the Mercado Pago REST APIs.40.4 Apache Ignite Java Client APIThe Ignite Java client API provides native Java access to Ignite clusters for table operations, SQL queries...40.0 IBM MQ JMS APIJava Message Service API for IBM MQ.39.5 TiKV Java ClientThe official Java client for TiKV. Supports raw key-value operations and transactional operations via gRPC....39.5 Apache HBase Java Client APIJava client API for all HBase data operations including table administration, filters, coprocessors, batch ...39.4

Thin 37 Limited public surface area

Apache Helix Java APIJava API for implementing Helix participant, spectator, and controller roles, with APIs for resource manage...38.5 Apache Jena Java APIThe Jena Java API provides programmatic access to RDF model creation, SPARQL query execution, OWL reasoning...38.0 Docling Java BindingsA Java API for Docling that lets JVM applications call into the Docling pipeline. Complementary to `docling...37.9 Docling4jBrings Docling document understanding into Java projects with idiomatic Java APIs over the Docling serializ...37.9 Apache Storm Topology APIThe Storm Topology API provides Java and other language bindings for building real-time processing topologi...37.7 Apache ZooKeeper Client APIThe ZooKeeper client API provides Java and C language bindings for distributed coordination operations. Ope...37.5 Veritas Cluster Server Java APIJava-based API for integrating VCS management into enterprise applications.37.4 Apache Tomcat JMX Proxy APIThe Apache Tomcat JMX Proxy Servlet provides HTTP-based access to JMX MBeans for querying, getting, setting...36.4 CloudEvents Java SDKThe official Java SDK for CloudEvents provides libraries for producing and consuming CloudEvents in Java ap...36.3 Split Java SDKThe Split Java SDK provides server-side feature flag evaluation for Java and JVM-based applications with lo...35.9 AutoRest Java GeneratorThe AutoRest Java generator (@autorest/java) produces Java client libraries from OpenAPI specifications, ge...34.8 Apache CXFCXF provides Java APIs for building SOAP (JAX-WS) and REST (JAX-RS) web services with WSDL-first and code-f...34.4 Apache Geode Java Client APIJava API for cache operations, continuous queries, function execution, and data serialization in Apache Geo...34.1 Apache Hudi Java APIJava API for writing Hudi tables with upserts, inserts, and deletes, plus timeline management, compaction, ...34.1 Apache Flume Java APIJava API for building custom Flume sources, channels, sinks, and interceptors. Provides interfaces for deve...33.6 Apache HttpComponents Java SDKMaven artifact for Apache HttpComponents HttpClient 5.x providing full HTTP client functionality including ...33.6 Apache CuratorCurator provides a high-level Java API with fluent builders for ZooKeeper operations, along with pre-built ...33.1 Apache Tika Java APIThe Tika Java API provides the AutoDetectParser for automatic format detection and parsing, Metadata class ...33.1 Apache Giraph Java APIJava API based on the Bulk Synchronous Parallel (BSP) model for implementing graph algorithms, with Vertex,...31.9 Apicurio CodegenApicurio Codegen generates Java JAX-RS server stubs and client code from OpenAPI specifications, enabling d...31.7 Apicurio Data ModelsApicurio Data Models is a Java and TypeScript library for parsing, validating, and manipulating OpenAPI and...31.7 Apache BookKeeper Java Client APIThe BookKeeper Java client API provides programmatic access for creating, writing, reading, and managing le...31.3 SVNKit Java LibrarySVNKit is a pure Java Subversion client library providing full access to Subversion repository and working ...31.0 Apache Maven CoreMaven provides a Java API for programmatic build execution, a Plugin API (Mojo) for extending build capabil...30.2 Apache TinkerPop Gremlin Traversal APIThe Gremlin graph traversal language and API provide a functional, data-flow-based language for expressing ...30.2 Apache Camel Java DSL APIThe Apache Camel Java DSL provides a fluent API for defining integration routes using Enterprise Integratio...30.0 Apache DerbyDerby provides a standard JDBC API for database operations in both embedded (org.apache.derby.jdbc.Embedded...29.3 Sejda ConsoleCommand-line shell over the Sejda SDK for running PDF tasks (merge, split, etc.) from a terminal or scripts...29.2 Sejda SDKOpen-source (AGPLv3) Java library for PDF manipulation - merge, split, rotate, encrypt, watermark, and more...29.2 Authsignal Java SDKOfficial Java / Kotlin SDK for the Authsignal Server API.28.5 Crystal Reports SDKSoftware Development Kit for embedding Crystal Reports into applications.28.5 Gatling Load TestingGatling is an open-source load testing framework built on Akka and Netty, providing high performance with a...28.3 REST AssuredREST Assured is a Java DSL library for testing and validating RESTful APIs using a fluent, BDD-style syntax...28.3 Apache Calcite Java APIThe Apache Calcite Java API provides SQL parsing, validation, query planning, and optimization capabilities...28.2 PhonePe Java Backend SDKServer-side Java SDK that wraps the PhonePe PG REST API, handling X-VERIFY signing, request modelling, and ...27.2 Apache LuceneLucene provides a comprehensive Java API for full-text indexing, searching, faceting, hit highlighting, spa...26.7 MCP Java SDKOfficial Java SDK for building MCP servers and clients on the JVM. Maintained in the modelcontextprotocol/j...26.7

Emerging 37 Early or largely undocumented

Cucumber JVMJava/JVM implementation of Cucumber supporting Java, Kotlin, Scala, and other JVM languages. Distributed vi...25.7 Apache Wicket Component APIThe Wicket Component API provides the core Java classes for building web UIs. Pages extend WebPage, compone...25.6 Apache Tapestry Component APIThe Tapestry Component API provides Java annotations and interfaces for building reusable web components. C...24.8 what3words Java SDKOfficial Java wrapper around the what3words Public API for server-side JVM applications.24.6 Apache Sling Resource APIThe Sling Resource API provides RESTful access to JCR content repository nodes via HTTP. Every content node...23.3 Apache Sling Scripting APIThe Sling Scripting API enables server-side rendering through multiple scripting engines. Scripts are resol...23.3 Resilience4jResilience4j is a lightweight fault tolerance library for Java 17+ using functional programming patterns. I...21.6 Apache Ant Build ToolApache Ant provides a Java library and command-line tool for automating build processes through XML-based b...21.5 Apache IvyApache Ivy is a dependency manager for Ant builds, enabling declaration, resolution, and retrieval of proje...21.5 Mockito CoreThe core Mockito mocking framework for creating mock objects, stubbing methods, verifying invocations, and ...21.5 Apache FtpServerApache FtpServer is a 100% pure Java FTP server built on MINA. It is designed to be used as a complete and ...21.0 Apache MINA CoreMINA Core provides a Java NIO-based API for building high-performance network applications with support for...21.0 Apache MINA SSHDApache MINA SSHD is a comprehensive Java library for client- and server-side SSH protocol implementation. I...21.0 RocksJava APIOfficial Java bindings for RocksDB providing full access to the RocksDB feature set from Java applications....20.8 Garden Jib ProviderProvider that builds Java container images using Jib without a Docker daemon, integrated into the Garden ac...20.6 JUnit 4 VintageThe legacy version of JUnit still widely used in Java projects.20.6 JUnit 5 JupiterThe next generation of JUnit for Java 8 and beyond, providing an expressive API for writing tests and exten...20.6 Apache Tez DAG APIThe Tez DAG API provides a Java programming model for defining and submitting directed-acyclic-graph (DAG) ...19.9 Hibernate ValidatorHibernate Validator is the reference implementation of Jakarta Bean Validation. Version 9.1.0.Final impleme...19.7 Jakarta Bean Validation Specification 3.1The Jakarta Bean Validation 3.1 specification defines the constraint model, annotation processor, Validator...19.7 Jakarta Validation APIThe Jakarta Validation API JAR provides the interfaces, annotations, and exception types that constitute th...19.7 Apache Jclouds BlobStore APIThe jclouds BlobStore API provides a unified Java interface for object storage operations across AWS S3, Az...19.6 Apache Jclouds Compute APIThe jclouds Compute API provides a unified Java interface for managing virtual machine instances, images, h...19.6 Thymeleaf CoreThe core Thymeleaf template engine library providing HTML, XML, TEXT, JavaScript, and CSS template mode pro...18.5 Thymeleaf Extras and DialectsAdditional Thymeleaf dialect extensions including the Java 8 Time dialect for date/time formatting, the Spr...18.5 Thymeleaf Spring IntegrationThe Thymeleaf Spring integration module (thymeleaf-spring6) providing deep integration with Spring Framewor...18.5 Burp Suite Montoya Extension APIThe Java-based extension API for building custom Burp Suite extensions (BApps). The Montoya API is the curr...18.2 TLC Model CheckerTLC is the primary model checker for specifications written in TLA+. It can be run from the command line us...17.8 Parquet Java APIJava implementation for reading and writing Parquet files.17.6 RetrofitRetrofit is a type-safe HTTP client for the JVM that turns annotated Java/Kotlin interfaces into HTTP API c...17.5 Log4j APIThe logging facade providing a feature-rich Java interface for application logging. Applications code again...16.4 Log4j CoreThe reference implementation of the Log4j API providing appenders, layouts, filters, lookups and configurat...16.4 URCap SDK (PolyScope 5)The URCap SDK is the Java-based extension framework for PolyScope 5 that powers Universal Robots' UR+ ecosy...15.9 Netflix HystrixNetflix Hystrix is a latency and fault tolerance library designed to isolate points of access to remote sys...15.4 Feign CoreFeign Core is the base library that processes annotated Java interfaces into templated HTTP requests. It de...14.2 JDBC APIJava Database Connectivity (JDBC) is the standard Java API for connecting Java applications to relational d...13.1 PostgreSQL JDBC DriverThe official Type 4 JDBC driver for PostgreSQL enables Java applications to connect to PostgreSQL using the...11.6

Minimal 9 Almost no public developer surface

JibJib is an open-source container image builder from Google that builds optimized Docker and OCI images for J...10.6 JMock Core APICore library for creating mock objects and defining expectations in Java tests using an expressive DSL. Sup...10.5 LagomLagom is an open source framework for building reactive microservice systems in Java and Scala, built on to...9.6 Jakarta JSON ProcessingThe Jakarta JSON Processing specification (formerly JSR 374) for parsing, generating, transforming, and que...9.4 Jakarta ValidationThe Jakarta Validation specification (originally JSR-303, then JSR-349, JSR-380) for defining and enforcing...9.4 Jakarta FacesThe Jakarta Faces specification for building component-based web user interfaces in Java applications. Defi...8.2 Jakarta JSON BindingThe Jakarta JSON Binding specification for marshaling Java objects to JSON and unmarshaling JSON back into ...8.2 Jakarta Persistence APIThe Jakarta Persistence specification for object-relational mapping in Java applications, defining annotati...8.2 OkHttpOkHttp is an efficient HTTP and HTTP/2 client for Android and Java applications with connection pooling and...4.5

Companies reaching this through an API (69)

These companies publish an API, specification or operation carrying “Java” but do not classify their business under it. Listed unranked and kept out of the count above, because one tagged operation is not a statement about what a company does.

Apache BookKeeper Apache Calcite Apache Camel Apache Flume Apache Geode Apache Giraph Apache HBase Apache Helix Apache Hudi Apache Iceberg Apache Ignite Apache Parquet Apache Storm Apache Tez Apache Tika Apache TinkerPop Apache ZooKeeper Appian Authsignal Automation Anywhere AutoRest Azure Migrate Braintree Clerk CloudEvents commercetools Crystal Reports Cucumber Dagger DataHub Docling Garden Google Gemini GOV.UK Notify HashiCorp Nomad IBM MQ Infor MATLAB Mercado Pago Microsoft SQL Server Model Context Protocol (MCP) Moov Neo4j Oracle Database Oracle Essbase Oracle WebLogic Server PhonePe PortSwigger PostgreSQL Red5

Show all 69 companies ↓

Refinitiv Refinitiv Eikon RocksDB Scalability Testing Scalar Sejda Signal Split SQL Subversion TiKV TLA Plus Foundation Token.io turbopuffer Universal Robots Veeva Veritas Cluster Server what3words Wowza

Score breakdown

Frequency

58.5

log-scaled weighted occurrences

Breadth

1.3

spread across providers

Quality lift

27.8

mean composite of providers using it

Cohesion

10.9

strength of nearest seed neighbor

Where this tag comes from

Provider tag98

Api tag123

Cohort brief

Auto-generated

The 96 providers in the APIs.io catalog tagged Java, scored on the Kin Score. Every figure below is computed from the catalog — nothing here is written.

Providers

of 98 in the catalog

Mean Kin Score

28.4

+4.3 vs catalog 24.1

Mean Agent Readiness

12.2

-1.9 vs catalog 14.1

Spread

1.9–74.1

median 26.8 · σ 14.2

How the 96 split by band

Exemplar 3Strong 2Developing 14Thin 31Emerging 34Minimal 12

Facet averages, against the whole catalog

Facet	This cohort	Catalog	Difference	Scored
Operational Transparency	27.1	13.2	+13.9	96
Contract Quality	28.1	18.6	+9.5	96
Developer Ergonomics	31.5	24.5	+7	96
Contract Governance	12.9	9.7	+3.2	96
Discoverability	59.2	59.1	+0.1	96
Access Clarity	15.3	30	-14.7	96

A facet is averaged over the members that carry it, not over the whole cohort — the “Scored” column is that count. Averaging an absent facet as zero would score our own coverage gaps as the providers’ posture.

What this cohort publishes

Artifact	This cohort	Catalog	Difference
MCP server (any)	6%	18%	-12
MCP server (first-party)	3%	16%	-13
Agent Skills	0%	0%	0
OAuth scopes	2%	13%	-11
Security	92%	99%	-7
Arazzo workflows	0%	1%	-1
Governance rules	67%	36%	+31

mcp_pct counts any mcp/ artifact including ones API Evangelist derived from the provider OpenAPI; mcp_first_party_pct counts only servers the provider publishes. Prefer the latter.

Top by Kin Score

1 dotCMS 74.1
2 Eclipse Foundation 73
3 Bonitasoft 67.4
4 Gradle 61.1
5 ThingsBoard 58.1
6 Zeebe 51.6
7 Apiman 46.6
8 Apollo Config 45.2
9 Lightbend 44.4
10 Apache Struts 42.7

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Tools for tags

7 MCP tools reach this

find_tagsBrowse and filter every tag in the catalog.
get_cohortThis tag as a scored cohort — every provider carrying it, with scores.
cohort_statsPRO — the distribution across this tag: mean, median, band split, adoption rates.
cohort_rankingsPRO — the leaderboard, on composite AND agent-readiness axes.
apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
resolveTurn a domain, URL or GitHub org into the provider it belongs to.
find_cohortsEvery scored population of providers in the catalog.

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Java

Providers using this tag (98)

APIs with this tag (123)