I have to build an Eclipse-plugin with a Maven/Tycho which has dependencies to other 3rd parties. As embedding dependencies is not yet supported by Tycho, I split up projects into two as following:
A-thirdparty: project with a packaging 'bundle', built by maven-bundle-plugin, having 'Embed-Dependency' instruction, and exporting all packages which are required by a plug-in 'A'A: project with a packaging 'eclipse-plugin', using tycho-maven-plugin, and Tycho's target-platform-configuration plug-in with pomDependencies set to consider.When I build them separately (at first, thirdparty aggregator, then project A itself), everything works fine. However, if I aggregate both those projects (using multi-module POM), I get the following Maven ERROR:
Caused by: java.lang.RuntimeException: "No solution found because the problem is unsatisfiable.": ["Unable to satisfy dependency from A 1.0.0.qualifier to package org.apache.axis2.transaction 0.0.0.", "Unable to satisfy dependency from A 1.0.0.qualifier to package org.apache.axis2.addressing.i18n 0.0.0.", ...
Why does building projects in aggregated fashion causes this error, and what kind of workaround could be possible if that's a Tycho bug?
Though, there's no error if I leave only one module in aggregation POM (independently which one).
EDIT
Cannot reproduce with a small, similar multi-module sample. Which means there's something about my POM hierarchy.
EDIT2
Was able to reproduce with a small, similar multi-module sample, after including same set of dependencies (couple of axis2 & axiom libs).
EDIT3: Minimalistic Example
Now I'm wondering if the problem is about missing all thirdparties required by thirdparty libraries I included. If so, then why am I able to build successfully when executing both modules separately, and build fails only when done via parent, multi-module pom.xml? The example below includes only one single axis2-kernel JAR, bundled in a pom-first artifact named first-thirdparty.
Instead of A, example has keywoard first. The folder structure is as following:
./pom.xml
./first-thirdparty
pom.xml
./first
src/main/java/org/mydemo/Test.java // has just one method that simply returns AxisFault.class.getSimpleName(); to test import resolution
META-INF/MANIFEST.MF
build.properties
pom.xml
Root pom:
<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>org.mydemo</groupId>
<artifactId>first-aggregator</artifactId>
<packaging>pom</packaging>
<version>1.0.0-SNAPSHOT</version>
<modules>
<module>first-thirdparty</module>
<module>first</module>
</modules>
</project>
POM of first-thirdparty. It simply embeds axis2-kernel JAR (no other libraries..):
<?xml version="1.0" encoding="UTF-8"?>
<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>
<parent>
<groupId>org.mydemo</groupId>
<artifactId>first-aggregator</artifactId>
<version>1.0.0-SNAPSHOT</version>
<relativePath>../pom.xml</relativePath>
</parent>
<properties>
<manifest-location>META-INF</manifest-location>
</properties>
<packaging>bundle</packaging>
<groupId>org.mydemo</groupId>
<artifactId>first-thirdparty</artifactId>
<version>1.0.0-SNAPSHOT</version>
<dependencies>
<dependency>
<groupId>org.apache.axis2</groupId>
<artifactId>axis2-kernel</artifactId>
<version>1.5.1</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.felix</groupId>
<artifactId>maven-bundle-plugin</artifactId>
<extensions>true</extensions>
<configuration>
<instructions>
<Embed-Dependency>
axis2-kernel
</Embed-Dependency>
<_exportcontents>
org.apache.axis2.*;version="1.5.1"
</_exportcontents>
<Bundle-ClassPath>{maven-dependencies}</Bundle-ClassPath>
<Embed-Transitive>true</Embed-Transitive>
<Embed-Directory>jars</Embed-Directory>
<_failok>true</_failok>
<_nouses>true</_nouses>
</instructions>
</configuration>
</plugin>
</plugins>
</build>
</project>
POM of first, which is an eclipse-plugin, and depends on first-thirdparty:
<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>
<parent>
<groupId>org.mydemo</groupId>
<artifactId>first-aggregator</artifactId>
<version>1.0.0-SNAPSHOT</version>
<relativePath>../pom.xml</relativePath>
</parent>
<groupId>org.mydemo</groupId>
<artifactId>org.mydemo.first-bundle</artifactId>
<packaging>eclipse-plugin</packaging>
<version>1.0.0-SNAPSHOT</version>
<properties>
<tycho.ver>0.14.1</tycho.ver>
</properties>
<repositories>
<repository>
<id>helios</id>
<layout>p2</layout>
<url>http://download.eclipse.org/releases/indigo</url>
</repository>
</repositories>
<dependencies>
<dependency>
<groupId>org.mydemo</groupId>
<artifactId>first-thirdparty</artifactId>
<version>1.0.0-SNAPSHOT</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.eclipse.tycho</groupId>
<artifactId>tycho-maven-plugin</artifactId>
<version>${tycho.ver}</version>
<extensions>true</extensions>
</plugin>
<plugin>
<groupId>org.eclipse.tycho</groupId>
<artifactId>target-platform-configuration</artifactId>
<version>${tycho.ver}</version>
<configuration>
<pomDependencies>consider</pomDependencies>
</configuration>
</plugin>
</plugins>
</build>
</project>
MANIFEST.MF of module first; it explicitly imports all packages of axis2-kernel:
Manifest-Version: 1.0
Bundle-Version: 1.0.0.qualifier
Tool: Bnd-0.0.357
Bundle-Name: first-bundle
Bnd-LastModified: 1334819004300
Created-By: 1.6.0_25 (Sun Microsystems Inc.)
Bundle-ManifestVersion: 2
Bundle-SymbolicName: org.mydemo.first-bundle
Export-Package: org.mydemo
Import-Package: org.apache.axis2.clustering.context,
org.apache.axis2.modules,
org.apache.axis2.deployment.util,
org.apache.axis2.dataretrieval.client,
org.apache.axis2.clustering,
org.apache.axis2.wsdl.util,
org.apache.axis2.clustering.configuration,
org.apache.axis2.java.security,
org.apache.axis2.deployment.resolver,
org.apache.axis2.util,
org.apache.axis2.wsdl,
org.apache.axis2.addressing.metadata,
org.apache.axis2.i18n,
org.apache.axis2.deployment.scheduler,
org.apache.axis2.dataretrieval,
org.apache.axis2.dispatchers,
org.apache.axis2.transport,org.apache.axis2.service,
org.apache.axis2.deployment.repository.util,
org.apache.axis2.client,
org.apache.axis2.context,
org.apache.axis2.classloader,
org.apache.axis2.receivers,
org.apache.axis2.engine,
org.apache.axis2.addressing,
org.apache.axis2.deployment,
org.apache.axis2.transport.http,
org.apache.axis2.phaseresolver,
org.apache.axis2.context.externalize,
org.apache.axis2.transaction,
org.apache.axis2.description,
org.apache.axis2.addressing.wsdl,
org.apache.axis2.transport.http.util,
org.apache.axis2.util.threadpool,
org.apache.axis2,
org.apache.axis2.handlers,
org.apache.axis2.addressing.i18n,
org.apache.axis2.builder,
org.apache.axis2.description.java2wsdl,
org.apache.axis2.builder.unknowncontent,
org.apache.axis2.namespace,
org.apache.axis2.description.java2wsdl.bytecode,
org.apache.axis2.client.async,
org.osgi.framework;version="1.3.0"
Bundle-Localization: plugin
It is not possible to build "POM-first" bundles (i.e. bundles built with maven-bundle-plugin) and "MANIFEST-fist" bundles (i.e. bundles built by Tycho) in the same reactor. This is a known limitation in Tycho.
The reason is that Tycho does its dependency resolution too early in the Maven lifecycle when the maven-bundle-plugin has not yet had a chance to generate the Manifest (needed by Tycho). Addressing this problem needs quite large changes, but I still hope to get this done in mid-term.