What is JZMQ?

This is the Java language binding for libzmq (aka ZeroMQ, 0MQ).

The latest javadocs.

Building and Installing JZMQ

To build you need to have the libzmq library already installed, then you run:

cd jzmq-jni/
./autogen.sh
./configure
make
make install
cd ..
mvn package

If you hope to install to your local maven, then you should run:

mvn install -Dgpg.skip=true

Building Windows 64bit with CMake & NMake

It is recommended to follow these steps with the Visual C++ 2015 Build Tools.

1. create a new and empty directory:

d:\temp\>mkdir JZMQ
d:\temp\>cd JZMQ
d:\temp\JZMQ\>

2. Clone the repository to your new directory

d:\temp\JZMQ\>git clone https://github.com/zeromq/jzmq.git

3. dive into the checkedout repository and create a new build64 folder

d:\temp\JZMQ\>cd jzmq\jzmq-jni
d:\temp\JZMQ\jzmq\jzmq-jni\>mkdir build64
d:\temp\JZMQ\jzmq\jzmq-jni\>cd build64

4. Now call CMake to generate the project

D:\temp\JZMQ\jzmq\jzmq-jni\build64>cmake .. -G "NMake Makefiles" -DZMQ_C_INCLUDE_PATH=<path to zmq include> -DZMQ_C_LIB_PATH=<path to zmq library>
-- The C compiler identification is MSVC 19.0.24210.0
-- The CXX compiler identification is MSVC 19.0.24210.0
-- Check for working C compiler: C:/Program Files (x86)/Microsoft Visual Studio 14.0/VC/bin/amd64/cl.exe
-- Check for working C compiler: C:/Program Files (x86)/Microsoft Visual Studio 14.0/VC/bin/amd64/cl.exe -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working CXX compiler: C:/Program Files (x86)/Microsoft Visual Studio 14.0/VC/bin/amd64/cl.exe
-- Check for working CXX compiler: C:/Program Files (x86)/Microsoft Visual Studio 14.0/VC/bin/amd64/cl.exe -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Found Java: C:/Program Files/Java/jdk1.8.0_91/bin/java.exe (found version "1.8.0.91")
-- Found JNI: C:/Program Files/Java/jdk1.8.0_91/lib/jawt.lib
-- Configuring done
-- Generating done
-- Build files have been written to: D:/temp/JZMQ/jzmq/jzmq-jni/build64

5. Now finally call NMake to build the zmq.jar and jzmq.lib, jzmq.dll

D:\temp\JZMQ\jzmq\jzmq-jni\build64>nmake
Microsoft (R) Program Maintenance Utility Version 14.00.24210.0
Copyright (C) Microsoft Corporation.  All rights reserved.

[ 10%] Generating config.hpp
[ 20%] Generating org/zeromq/ZMQ.class, org/zeromq/Utils.class, org/zeromq/ZMQ$$Context.class, org/zeromq/ZMQ$$Socket.class, org/zeromq/ZMQ$$PollItem.class, org/zeromq/ZMQ$$Poller.class, org/zeromq/ZM
Q$$Error.class, org/zeromq/ZMQException.class, org/zeromq/ZMQQueue.class, org/zeromq/ZMQForwarder.class, org/zeromq/ZMQStreamer.class, org/zeromq/EmbeddedLibraryTools.class, org/zeromq/App.class, org/
zeromq/ZContext.class, org/zeromq/ZDispatcher.class, org/zeromq/ZDispatcher$$1.class, org/zeromq/ZDispatcher$$SocketDispatcher$$1.class, org/zeromq/ZDispatcher$$SocketDispatcher$$2.class, org/zeromq/Z
Dispatcher$$SocketDispatcher$$ZMessageBuffer.class, org/zeromq/ZDispatcher$$SocketDispatcher.class, org/zeromq/ZDispatcher$$ZMessageHandler.class, org/zeromq/ZDispatcher$$ZSender.class, org/zeromq/ZFr
ame.class, org/zeromq/ZMsg.class, org/zeromq/ZLoop.class, org/zeromq/ZLoop$$IZLoopHandler.class, org/zeromq/ZLoop$$SPoller.class, org/zeromq/ZLoop$$STimer.class, org/zeromq/ZThread.class, org/zeromq/Z
Thread$$IAttachedRunnable.class, org/zeromq/ZThread$$IDetachedRunnable.class, org/zeromq/ZThread$$ShimThread.class
Note: Some input files use or override a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
[ 30%] Generating org_zeromq_ZMQ.h, org_zeromq_ZMQ_Error.h, org_zeromq_ZMQ_Context.h, org_zeromq_ZMQ_Socket.h, org_zeromq_ZMQ_PollItem.h, org_zeromq_ZMQ_Poller.h
[ 40%] Generating lib/zmq.jar
Scanning dependencies of target jzmq
[ 40%] Generating org/zeromq/ZMQ.class, org/zeromq/Utils.class, org/zeromq/ZMQ$$Context.class, org/zeromq/ZMQ$$Socket.class, org/zeromq/ZMQ$$PollItem.class, org/zeromq/ZMQ$$Poller.class, org/zeromq/ZM
Q$$Error.class, org/zeromq/ZMQException.class, org/zeromq/ZMQQueue.class, org/zeromq/ZMQForwarder.class, org/zeromq/ZMQStreamer.class, org/zeromq/EmbeddedLibraryTools.class, org/zeromq/App.class, org/
zeromq/ZContext.class, org/zeromq/ZDispatcher.class, org/zeromq/ZDispatcher$$1.class, org/zeromq/ZDispatcher$$SocketDispatcher$$1.class, org/zeromq/ZDispatcher$$SocketDispatcher$$2.class, org/zeromq/Z
Dispatcher$$SocketDispatcher$$ZMessageBuffer.class, org/zeromq/ZDispatcher$$SocketDispatcher.class, org/zeromq/ZDispatcher$$ZMessageHandler.class, org/zeromq/ZDispatcher$$ZSender.class, org/zeromq/ZFr
ame.class, org/zeromq/ZMsg.class, org/zeromq/ZLoop.class, org/zeromq/ZLoop$$IZLoopHandler.class, org/zeromq/ZLoop$$SPoller.class, org/zeromq/ZLoop$$STimer.class, org/zeromq/ZThread.class, org/zeromq/Z
Thread$$IAttachedRunnable.class, org/zeromq/ZThread$$IDetachedRunnable.class, org/zeromq/ZThread$$ShimThread.class
Note: Some input files use or override a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
[ 40%] Generating org_zeromq_ZMQ.h, org_zeromq_ZMQ_Error.h, org_zeromq_ZMQ_Context.h, org_zeromq_ZMQ_Socket.h, org_zeromq_ZMQ_PollItem.h, org_zeromq_ZMQ_Poller.h
[ 50%] Building CXX object CMakeFiles/jzmq.dir/src/main/c++/Context.cpp.obj
Context.cpp
[ 60%] Building CXX object CMakeFiles/jzmq.dir/src/main/c++/Poller.cpp.obj
Poller.cpp
D:\temp\JZMQ\jzmq\jzmq-jni\src\main\c++\Poller.cpp(76): warning C4244: '=': conversion from 'jint' to 'short', possible loss of data
[ 70%] Building CXX object CMakeFiles/jzmq.dir/src/main/c++/Socket.cpp.obj
Socket.cpp
D:\temp\JZMQ\jzmq\jzmq-jni\src\main\c++\Socket.cpp(266): warning C4267: 'argument': conversion from 'size_t' to 'jsize', possible loss of data
D:\temp\JZMQ\jzmq\jzmq-jni\src\main\c++\Socket.cpp(272): warning C4267: 'argument': conversion from 'size_t' to 'jsize', possible loss of data
D:\temp\JZMQ\jzmq\jzmq-jni\src\main\c++\Socket.cpp(847): warning C4267: 'initializing': conversion from 'size_t' to 'int', possible loss of data
D:\temp\JZMQ\jzmq\jzmq-jni\src\main\c++\Socket.cpp(875): warning C4267: 'initializing': conversion from 'size_t' to 'int', possible loss of data
[ 80%] Building CXX object CMakeFiles/jzmq.dir/src/main/c++/util.cpp.obj
util.cpp
[ 90%] Building CXX object CMakeFiles/jzmq.dir/src/main/c++/ZMQ.cpp.obj
ZMQ.cpp
[100%] Linking CXX shared library lib\jzmq.dll
   Creating library lib\jzmq.lib and object lib\jzmq.exp
   Creating library lib\jzmq.lib and object lib\jzmq.exp
[100%] Built target jzmq

Avoiding JNI

JZMQ uses JNI to wrap libzmq for the best performance. If performance isn't your primary goal, look at the JeroMQ project, which is a pure Java implementation that provides an identical API to JZMQ, and uses the same protocol.

Building Packages

To build a Debian package, run:

$ dpkg-buildpackage -rfakeroot

To build an RPM package, run:

$ rpmbuild -tb jzmq-X.Y.Z.tar.gz

Where X.Y.Z is replaced with the version that you've downloaded.

If configure can't find your libzmq installation, you can tell it where to look, using e.g. --with-zeromq=/usr/local.

You may want to take a look at http://www.zeromq.org/docs:tuning-zeromq for additional hints.

For more information, refer to the ØMQ website at http://www.zeromq.org/.

On Mac OS X you may need to compile and make install pkg-config if configure fails with "syntax error near unexpected token newline".
See http://stackoverflow.com/questions/3522248/how-do-i-compile-jzmq-for-zeromq-on-osx for details.

You may also need to symlink the header files of your standard Java installation (e.g. /Developer/SDKs/MacOSX10.6.sdk/System/Library/Frameworks/JavaVM.framework/Versions/CurrentJDK/Headers/*.h) into a suitable directory (e.g. /usr/local/include) and point the JAVA_HOME environment variable to the parent directory (e.g./usr/local).

Acknowledgements

YourKit is kindly supporting ZeroMQ project with its full-featured Java Profiler.

Copying

Free use of this software is granted under the terms of the GNU Lesser General Public License (LGPL). For details see the files COPYING and COPYING.LESSER included with the Java binding for ØMQ.