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The Darwino Domino NAPI

The Darwino Domino NAPI provides Java access to the Notes/Domino C API via JNI, as well as a set of wrapper classes for easier programming. It is similar to the NAPI included in Domino, but covers more functionality and is not proprietary.

The library is available in OpenNTF's Maven Server with the identifier com.darwino.domino:com.darwino.domino.napi:2.2.0-SNAPSHOT.


To access the bound C API functions directly, use the com.darwino.domino.napi.DominoAPI class's .get() method, which provides access to each of the C functions. Additionally, the com.darwino.domino.napi.C class provides static methods and properties for data-type sizing and memory access.

Beyond the direct accessor methods, there are several packages with encapsulation classes:

  • com.darwino.domino.napi.enums contains Java-style enums for many of the Notes C enumerations
  • com.darwino.domino.napi.proc contains abstract classes to implement callbacks in bound functions
  • com.darwino.domino.napi.struct contains Java representations of Notes C structures, including data getters and setters. The .cd package contains composite data record types
  • com.darwino.domino.napi.wrap contains high-level abstractions generally analagous to the core lotus.domino interfaces. The primary starting point is NSFSession, which can be instantiated directly or created based on an existing lotus.domino.Session object.

Resource Management

Resource management in the NAPI is handled similarly to the lotus.domino API: each struct and wrapper class has .free() method to deallocate any associated C-side memory or objects, and each wrapper class maintains a view of its logical "child" wrapper objects and classes. Though all of these classes contain last-ditch calls to .free() in their .finalize() methods, this should not be relied upon for memory/resource management, as the JVM is inconsistent in handling it.

The direct C memory methods (e.g. C.malloc) provide no safety or tracking for their memory and so should be used just as they would be in C/C++.

XPages Applications

To use the library in an XPage application, install the Update Site in Domino and Designer and enable the "com.darwino.domino.napi.xsp" library in the Xsp Properties file. This will add the NAPI classes to your project's classpath.

Requirements/Supported Platforms

This requires a Notes or Domino runtime on a supported platform:

  • Windows 32-bit
  • Windows 64-bit
  • macOS 64-bit
  • Linux 32-bit
  • Linux 64-bit

Additionally, the Java classes require Java 6 and IBM Commons, javax.mail+javax.mail.internet, and the legacy lotus.domino API (Notes.jar) on the classpath (enforced in OSGi). The XSP plugin and several API calls require a minimum Notes/Java version of 9.0.


As a JNI project, building can be complicated. See Building for more information. In most cases, the native portion can reuse the existing built artifacts in the repository until there is a C++-side change.


This project is licensed under the Apache License 2.0. See the LICENSE file for specifics and the NOTICE for information about included third-party code.


Domino C API bindings using JNI





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