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11.Jakarta Activation API1,987 usages

jakarta.activation » jakarta.activation-api EDL

Jakarta Activation API 2.2 Specification
Last Release on Sep 11, 2025

12.Jakarta RESTful WS API3,052 usages

jakarta.ws.rs » jakarta.ws.rs-api EPL +1

Jakarta RESTful Web Services
Last Release on May 2, 2024

13.Java Servlet API20,785 usages

javax.servlet » javax.servlet-api CDDL +2

Java Servlet is the foundation web specification in the Java Enterprise Platform. Developers can build web applications using the Servlet API to interact with the request/response workflow.
Last Release on Apr 20, 2018

Relocated → jakarta.servlet » jakarta.servlet-api

14.Jakarta JakartaEE API394 usages

jakarta.platform » jakarta.jakartaee-api EPL +1

Jakarta JakartaEE API
Last Release on Jun 17, 2025

15.Apache Log4j 1.x Compatibility API2,379 usages

org.apache.logging.log4j » log4j-1.2-api Apache

The Apache Log4j 1.x Compatibility API
Last Release on May 8, 2026

16.Jakarta XML Web Services API915 usages

jakarta.xml.ws » jakarta.xml.ws-api EDL

Jakarta XML Web Services API
Last Release on Feb 23, 2026

17.Jakarta Dependency Injection3,372 usages

jakarta.inject » jakarta.inject-api Apache

Jakarta Dependency Injection
Last Release on Oct 18, 2021

18.Jakarta Expression Language API1,006 usages

jakarta.el » jakarta.el-api EPL +1

Jakarta Expression Language defines an expression language for Java applications
Last Release on Jul 19, 2024

19.JJWT :: API1,016 usages

io.jsonwebtoken » jjwt-api Apache

The public API for the JJWT library, used to create and consume JSON Web Tokens in Java.
Last Release on Aug 20, 2025

20.OpenTelemetry Java1,649 usages

io.opentelemetry » opentelemetry-api Apache

OpenTelemetry API
Last Release on May 9, 2026