I tried to add Apache Camel support in an Eclipse RCP application. With the new Eclipse, I can also add maven repositories in the target platform file, so that is what I did. My target platform contains:
<dependency>
<groupId>org.apache.camel</groupId>
<artifactId>camel-core</artifactId>
<version>4.6.0</version>
<type>jar</type>
</dependency>
I also checked the includeDependency field to include the required dependencies. All is well so far, I get all 20 or so plugins for the camel projects auto-generated. I add them in my manifest files, compile is working, everything is fine. Except when I try to start camel, I get a runtime exception saying No language for 'simple' found
(something similar, I don't have the exact stackstrace now).
The problem is this one:
simple
language is in the core-languages modulecore-engine
module tries to load the simple
language(from the core-languages
) into the camel contextcore-engine
and core-languages
are 2 distinct plugins, thus the Equinox classloader will not allow core-engine
to see any files in the META-INF folder inside the core-languages
moduleI can only think of 2 possible solutions for this:
For both approaches I think is quite cumbersome to add another Camel component afterwards, because it will probably involve modifying the custom project I created to include the new component(assuming core-engine
needs to access it to load it into the context). Also I don't see how I can separate the Camel core from the optional components.
Any ideas to make Camel work with Eclipse RCP?
You can find my target platform here: https://github.com/grozadanut/ro.linic.ui/blob/main/target-platform/target-platform.target
And the RCP product is here: https://github.com/grozadanut/ro.linic.ui/blob/main/ro.linic.ui.product/linic.product
I ended up adding all Camel core jars to my ro.linic.ui.camel.core plugin. And to be able to use camel in other plugins I add this ro.linic.ui.camel.core plugin as a dependency and I exported the required packages to be able to use camel code in my other plugins.
I did use Maven to automate downloading the jars, so I don't have to download each one individually. The pom I used:
<project>
<modelVersion>4.0.0</modelVersion>
<parent>
<relativePath>../pom.xml</relativePath>
<groupId>ro.linic.tycho</groupId>
<artifactId>releng</artifactId>
<version>1.0.0-SNAPSHOT</version>
</parent>
<groupId>ro.linic.ui</groupId>
<artifactId>ro.linic.ui.camel.core</artifactId>
<version>0.0.1</version>
<packaging>eclipse-plugin</packaging>
<dependencyManagement>
<dependencies>
<!-- Camel BOM -->
<dependency>
<groupId>org.apache.camel</groupId>
<artifactId>camel-bom</artifactId>
<version>4.6.0</version>
<scope>import</scope>
<type>pom</type>
</dependency>
</dependencies>
</dependencyManagement>
<dependencies>
<dependency>
<groupId>org.apache.camel</groupId>
<artifactId>camel-core</artifactId>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-dependency-plugin</artifactId>
<executions>
<execution>
<id>copy-dependencies</id>
<phase>prepare-package</phase>
<goals>
<goal>copy-dependencies</goal>
</goals>
<configuration>
<outputDirectory>${project.build.directory}/${project.build.finalName}.lib
</outputDirectory>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>
Then I took all camel jars from the generated output folder and added them to the manifest, in the Runtime -> Classpath section.