Created question in FIWARE Q/A platform on 18-04-2017 at 00:04
Please, ANSWER this question AT http://stackoverflow.com/questions/43460906/fiware-cygnus-build-failure

Question:
Fiware cygnus build failure

Description:
I wanted to use Fiware cygnus to persist data from the context broker into a CKAN instance. I've already created an orion context broker vm which is orion-psb-image-R5.4 version 1.7.0 and a ckan VM on Fiware cloud. I began to install fiware cygnus knowing that the cygnus is based on both cygnus-common and cygnus-ngsi . So, i started by downloading the fiware-cygnus https://github.com/telefonicaid/fiware-cygnus
, then i began building cygnus-common successfully using maven 3.2.5 . But when i started to build cygnus-ngsi it failed although i've tried many ways to solve this but Noone worked .
Here's what i have done in details .

Firstly installing Apache Flume as described here http://fiware-cygnus.readthedocs.io/en/1.3.0/cygnus-common/installation_and_administration_guide/install_from_sources/index.html

$ wget http://www.eu.apache.org/dist/flume/1.4.0/apache-flume-1.4.0-bin.tar.gz
tar xvzf apache-flume-1.4.0-bin.tar.gz
$ mv apache-flume-1.4.0-bin APACHE_FLUME_HOME
$ mv APACHE_FLUME_HOME/lib/httpclient-4.2.1.jar APACHE_FLUME_HOME/lib/httpclient-4.2.1.jar.old
$ mv APACHE_FLUME_HOME/lib/httpcore-4.2.1.jar APACHE_FLUME_HOME/lib/httpcore-4.2.1.jar.old
$ mv APACHE_FLUME_HOME/lib/libthrift-0.7.0.jar APACHE_FLUME_HOME/lib/libthrift-0.7.0.jar.old
$ mkdir -p APACHE_FLUME_HOME/plugins.d/cygnus/
$ mkdir APACHE_FLUME_HOME/plugins.d/cygnus/lib
$ mkdir APACHE_FLUME_HOME/plugins.d/cygnus/libext

secondly , downloading fiware-cygnus and building cygnus-common:

git clone https://github.com/telefonicaid/fiware-cygnus.git

cd fiware-cygnus/cygnus-common

mvn clean compile exec:exec assembly:single

cp target/cygnus-common-1.1.0-jar-with-dependencies.jar /usr/cygnus/plugins.d/cygnus/libext

mvn install:install-file -

Dfile=/usr/cygnus/plugins.d/cygnus/libext/cygnus-common-1.7.0_SNAPSHOT-jar-with-dependencies.jar -DgroupId=com.telefonica.iot -DartifactId=cygnus-common -Dversion=1.7.0 -Dpackaging=jar -DgeneratePom=false

cp target/classes/cygnus-flume-ng /usr/cygnus/bin/cygnus-flume-ng

then i started bulding cygnus-ngsi as follows

cd cygnus-ngsi

mvn clean compile exec:exec assembly:single

and i got these results on building it:

[INFO] Building cygnus-ngsi 1.7.0_SNAPSHOT
[INFO] ------------------------------------------------------------------------
[WARNING] The POM for com.telefonica.iot:cygnus-common:jar:1.7.0_SNAPSHOT is missing, no dependency information available
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 1.243 s
[INFO] Finished at: 2017-04-17T22:04:25+00:00
[INFO] Final Memory: 7M/28M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal on project cygnus-ngsi: Could not resolve dependencies for project com.telefonica.iot:cygnus-ngsi:jar:1.7.0_SNAPSHOT: Could not find artifact com.telefonica.iot:cygnus-common:jar:1.7.0_SNAPSHOT -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/DependencyResolutionException

I copied the generated jar file to the /usr/cygnus/plugins.d/cygnus/libext as explained in the same link above by running:

cp cygnus-common/target/cygnus-common-1.7.0_SNAPSHOT-jar-with-dependencies.jar /usr/cygnus/plugins.d/cygnus/libext

although i have also copied the jar file to maven repository path to make sure everything is set properly by running the command

cp cygnus-common/target/cygnus-common-1.7.0_SNAPSHOT-jar-with-dependencies.jar ~/.m2/repository/com/telefonica/iot/cygnus-common/1.7.0

Now i have in the ~/.m2/repository/com/telefonica/iot/cygnus-common/1.7.0 directory two jars, the cygnus-common-1.7.0_SNAPSHOT-jar-with-dependencies.jar and cygnus-common-1.7.0.jar as well as the usr/cygnus/plugins.d/cygnus/libext directory containing them and actually i don't know whether the existence of two jars inside either of these directories would make a problem or not.

i also thought that the cygnus-ngsi pom.xml file could be a part of the problem .. and here's the pom.xml of cygnus-ngsi:

<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>

<groupId>com.telefonica.iot</groupId>
<artifactId>cygnus-ngsi</artifactId>
<version>1.7.0_SNAPSHOT</version>
<packaging>jar</packaging>

<name>cygnus-ngsi</name>
<url>http://maven.apache.org&lt;/url&gt;

<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>

<dependencies>
<!-- Required for testing -->
<dependency>
<groupId>org.mockito</groupId>
<artifactId>mockito-all</artifactId>
<version>1.9.5</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.11</version>
<scope>test</scope>
</dependency>
<!-- Required by NGSIRestHandler -->
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpcore</artifactId>
<version>4.3.1</version>
</dependency>
<!-- Required for logging -->
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.17</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-simple</artifactId>
<version>1.7.21</version>
</dependency>
<!-- Required by NameMapper -->
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
<version>3.4</version>
</dependency>
<!-- Required by any agent -->
<dependency>
<groupId>com.telefonica.iot</groupId>
<artifactId>cygnus-common</artifactId>
<version>1.7.0_SNAPSHOT</version>
</dependency>
</dependencies>

<build>
<!-- reference: http://stackoverflow.com/questions/3697449/retrieve-version-from-maven-pom-xml-in-code -->
<resources>
<resource>
<directory>src/main/resources</directory>
<filtering>true</filtering>
</resource>
</resources>
<pluginManagement>
<plugins>
<!-- Explicit Java version declaration in needed in some systems in which Maven seems not -->
<!-- being able to find itself the right version. Many systems don't need this declaration -->
<!-- but it doesn't use to hurt anyway -->
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.5.1</version>
<configuration>
<source>1.7</source>
<target>1.7</target>
<compilerArgument></compilerArgument>
<fork>true</fork>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-assembly-plugin</artifactId>
<version>2.6</version>
<configuration>
<descriptorRefs>
<descriptorRef>jar-with-dependencies</descriptorRef>
</descriptorRefs>
</configuration>
</plugin>
<!-- http://www.chrissearle.org/2009/09/05/Using_maven-exec-plugin_to_store_the_current_git_sha_in_a_build/ -->
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>exec-maven-plugin</artifactId>
<version>1.5.0</version>
<executions>
<execution>
<phase>compile</phase>
<goals>
<goal>exec</goal>
</goals>
</execution>
</executions>
<configuration>
<executable>git</executable>
<arguments>
<argument>rev-parse</argument>
<argument>HEAD</argument>
</arguments>
<outputFile>target/classes/last_git_commit.txt</outputFile>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-site-plugin</artifactId>
<version>3.5.1</version>
<configuration>
<reportPlugins>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>cobertura-maven-plugin</artifactId>
<version>2.6</version>
<configuration>
<aggregate>true</aggregate>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-report-plugin</artifactId>
<version>2.16</version>
<configuration>
<aggregate>true</aggregate>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-checkstyle-plugin</artifactId>
<version>2.12</version>
<configuration>
<configLocation>telefonica_checkstyle.xml</configLocation>
<includeTestSourceDirectory>false</includeTestSourceDirectory>
<failOnViolation>false</failOnViolation>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-javadoc-plugin</artifactId>
<version>2.9</version>
<configuration>
<aggregate>true</aggregate>
</configuration>
</plugin>
</reportPlugins>
</configuration>
</plugin>
</plugins>
</pluginManagement>
</build>
</project>

Now i want to know what may cause this failure . All i want to do is to set a cygnus agent to use the ckansink by configuring the agent_.conf file with providing the necessary ckan parameters and then start the cygnus. and i know the this process wouldn't be completed unless the cygnus-ngsi was built successfuly