djvm

Copyright 2015 James Mahler
Licensed under the terms of the MIT license - See LICENSE

Allows for access to Java JVM from D. Provide D'esk interfaces as the C interaction into JNI is messy to say the least. This is a slow work in progress.

Motivation

The main motivation behind this is to provide simple access to things that run on the JVM. Two possibilities that come up immediately are JDBC and Hadoop. Using JNI from C/C++ to embed a JVM into an application is one of the ways to provide database access. To utilize technologies like HSQLDB, I believe it is currently the only way.

Getting Started

Requirements:

• Java VM (if using package manager, make sure to install -dev packages)
• dmd
• LD_LIBRARY_PATH pointing to jvm install (/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/amd64/server for example)

Compiling (For now I just do this in the source/djvm directory):

• dub

Example

Here is an example usage of the D api:

DJvm djvm = new DJvm("");
scope(exit) {
	djvm.destroyJvm();
}

JClass systemCls = djvm.findClass("java.lang.System");
JClass printCls = djvm.findClass("java.io.PrintStream");

JStaticField field = systemCls.getStaticField("out", JniType!("java.io.PrintStream"));
jobject obj = field.getObject();

JMethod method = printCls.getMethod("println", JniSig!(["int"], "void"));
method.callVoid(obj, 100);

Work

Work is now being tracked through issues.