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This is a demo project of aPubSub application using∅mq with Google'sProtocol Buffers for serializing data build withMaven.
I have a multi account system, so I have to switch to my administrator account.
su adminInstall∅mq form source (the latest homebrew version3.2.1-rc2 had some errors that cause jzmq unit tests to fail)
cd ~/Projects/externalgit clone git://github.com/zeromq/libzmq.gitcd libzmq./autogen.sh./configuremakemake installExit to the normal user
exitSwitch to admun user
su adminInstall latestjzmq
cd ~/Projects/externalgit clone git://github.com/zeromq/jzmq.gitcd jzmq./autogen.sh./configuremakemake installTest the installation
cd perfjava -Djava.library.path=/usr/local/lib -classpath /usr/local/share/java/zmq.jar:../src/zmq.jar:zmq-perf.jar local_lat tcp://127.0.0.1:5555 1 100At the first run this fails
...Library not loaded: /usr/local/lib/libzmq.1.dylib Referenced from: /usr/local/lib/libjzmq.0.dylibAnd indeed the file does not exist, butlibzmq.3.dylib does exist, so
ln -s /usr/local/lib/libzmq.3.dylib /usr/local/lib/libzmq.1.dylibRerun the perf test
java -Djava.library.path=/usr/local/lib -classpath /usr/local/share/java/zmq.jar:../src/zmq.jar:zmq-perf.jar local_lat tcp://127.0.0.1:5555 1 100java -Djava.library.path=/usr/local/lib -classpath /usr/local/share/java/zmq.jar:../src/zmq.jar:zmq-perf.jar remote_lat tcp://127.0.0.1:5555 1 100Proceed to compile the maven artifact
cd ..export JAVA_HOME=`/usr/libexec/java_home -v 1.7`mvn clean install -DskipTestsExit to the normal user
exitAlthough jzmq's officialmaven.readme advices you to add a dependency to the native artifact, I didn't work. In fact itdid only work without the native library.
So just add
<dependency><groupId>org.zeromq</groupId><artifactId>jzmq</artifactId><version>${version.jzmq}</version></dependency>to your dependencies.
I want to use Google'sProtocol Buffers as the serializing mechanism
Protocol Buffers are a way of encoding structured data in an efficient yet extensible format. Google uses Protocol Buffers for almost all of its internal RPC protocols and file formats.
brew install protobufThere is a Maven plugin to build.proto files. It's not released on Maven Central, so you have to add the plugin repository to your$M2_HOME/settings.xml. In this example I added it directly to thepom.xml though.
<pluginRepositories> <pluginRepository> <id>protoc-plugin</id> <url>http://sergei-ivanov.github.com/maven-protoc-plugin/repo/releases/</url> </pluginRepository></pluginRepositories>To include the generated source in Eclipse with m2eclipse. You also have to add
<plugin><groupId>org.codehaus.mojo</groupId><artifactId>build-helper-maven-plugin</artifactId><executions><execution><id>add-source</id><phase>generate-sources</phase><goals><goal>add-source</goal></goals><configuration><sources><source>${project.build.directory}/generated-sources/protoc</source></sources></configuration></execution></executions></plugin>to yourpom.xml.
Exception in thread "main" java.lang.UnsatisfiedLinkError: /usr/local/lib/libjzmq.0.dylib: dlopen(/usr/local/lib/libjzmq.0.dylib, 1): Library not loaded: /usr/local/lib/libzmq.1.dylib Referenced from: /usr/local/lib/libjzmq.0.dylib Reason: image not foundat java.lang.ClassLoader$NativeLibrary.load(Native Method)at java.lang.ClassLoader.loadLibrary1(ClassLoader.java:1939)at java.lang.ClassLoader.loadLibrary0(ClassLoader.java:1864)at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1854)at java.lang.Runtime.loadLibrary0(Runtime.java:845)at java.lang.System.loadLibrary(System.java:1084)at org.zeromq.ZMQ.<clinit>(ZMQ.java:35)at local_lat.main(local_lat.java:36)There is a/usr/local/lib/libzmq.3.dylib but no/usr/local/lib/libzmq.3.dylib.
As a workaround I executed
ln -s /usr/local/lib/libzmq.3.dylib /usr/local/lib/libzmq.1.dylibWhen trying to fix my zeromq installation I got
dyld: DYLD_ environment variables being ignored because main executable (/usr/bin/sudo) is setuid or setgidTurned out$LD_LIBRARY_PATH was set. Unset it via
unset LD_LIBRARY_PATHcd ~/Projects/external/jzmqmvn clean installfails with
Tests in error: testDestruction(org.zeromq.ZContextTest): no jzmq in java.library.path ...What isjava.library.path
java.library.path is used for pointing to native system libraries (dll or so files). It points to a directory and calls to native code that use System.loadLibrary look in that directory for the native libs.
The project dependencies (jar files) should be specified on the application's classpath, not in this location.
from1
As I couldn't get the tests to finish I did
mvn clean install -DskipTestsBut was greeted with
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-javadoc-plugin:2.7:jar (attach-javadoc) on project jzmq: MavenReportException: Error while creating archive:Unable to find javadoc command: The environment variable JAVA_HOME is not correctly set.Make sureJAVA_HOME is set. If you have Java 6
export JAVA_HOME=`/usr/libexec/java_home -v 1.6`or Java 7
export JAVA_HOME=`/usr/libexec/java_home -v 1.7`Unfortunately the Maven tests for jzmq ddidn't finish (correctly).
singleMessage(org.zeromq.ZDispatcherTest) Time elapsed: 1.01 sec <<< FAILURE!junit.framework.AssertionFailedError: expected:<0> but was:<1>and even worseRunning org.zeromq.ZFrameTest seems to be stuck in an endless loop.
The mailing listsuggested to remove homebrews latest version (3.2.1-rc2) and install libzmq from source.
This solved the problems with the tests.
The mailing list suggested to install zeromq from source
brew remove zeromqgit clone git://github.com/zeromq/libzmq.gitcd libzmq/./autogen.sh./configuremakemake installTesting the installation with perf failed at first
cd perfjava -Djava.library.path=/usr/local/lib -classpath /usr/local/share/java/zmq.jar:../src/zmq.jar:zmq-perf.jar local_lat tcp://127.0.0.1:5555 1 100...Library not loaded: /usr/local/lib/libzmq.1.dylib Referenced from: /usr/local/lib/libjzmq.0.dylibSo, I executed
ln -s /usr/local/lib/libzmq.3.dylib /usr/local/lib/libzmq.1.dylibThen I recompiled jzmq
cd ../jzmqmake cleanmakemake installNow the tests successfully ran, so installed the artifact
export JAVA_HOME=`/usr/libexec/java_home -v 1.7`mvn clean installThe code example for protocol buffers is taken from2 and the basic pubsub example is taken from ∅mq official java examples3, and4
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