Re: [tycho-user] Some help with tycho and classpaths

[Henrik Steudel <hst@xxxxxxxxx>]

Hi nikos,

This is what we did to solve the log4j classpath problem.

We used a separate fragment to attach a single log4.properties to e.g. apache.log4 bundle and therefore can be found when log4j starts up.  The fragment only consists of a src folder with log4j.properties in it.

This fragment must then be added to tycho-surefire classpath configuration because a fragment won't be picked up otherwise to start with test OSGi runtime.

snippet from test parent pom:
...
<plugin>
                <groupId>org.eclipse.tycho</groupId>
                <artifactId>target-platform-configuration</artifactId>
                <configuration>

                    <dependency-resolution>
                        <!-- http://dev.eclipse.org/mhonarc/lists/tycho-user/msg03464.html -->
                        <!-- <extraRequirements> lists all the optional bundles that must be
                            on the classpath. -->

                        <!-- logging fragment to provide logging.properties in classpath root -->
                        <!-- combine.children only required if any parent pom already defines extraRequirements, too -->
                        <extraRequirements combine.children="append">
                            <requirement>
                                <type>eclipse-plugin</type>
                                <id>com.XXX.tst.frw.common.logging</id>
                                <versionRange>0.0.0</versionRange>
                            </requirement>
...
This approach will work out of the box for JUnit-Plugin tests started from Eclipse workbench (with all Plugins from workspace and target platform enabled). The fragment will be resolved and supplies its log4j.properties to the classpath of host log4j bundle.

There is one drawback, however. We strive that plain JUnit tests can be executed equally from within Eclipse, not only JUnit Plugin tests.  As a plain JUnit test does not know about fragments, the fragment project needs to be checked out and added to test project's Project Dependencies in build path (BuildPath->Configure Build Path). This is a bit cumbersome, but manageable for us.
So, if you are working only with JUnit plugin Tests anyway, this won't affect you. If there is a more elegant solution for plain JUnit tests, I'd be pleased to hear about it.

Hope this helps.
Kind regards
Henrik

Am 15.12.2016 um 11:18 schrieb Jeff MAURY:

When you run a plugin test from Eclipse, the classpath is computed according to your target platform and your workspace.

When tests are run from Tycho, the classpath is computed from the target platform that you configured. It is possible to configure the Tycho surefire plugin to exclude some bundles or add new ones.

Hope this helps

Jeff

On Thu, Dec 15, 2016 at 10:36 AM, Nicholaos Petalidis <nikos@xxxxxxxxxxxx> wrote:

Apologies if this has been answered before, but I 've been trying to make my build process behave the same way as Eclipse does, but with minor success.

The thing I don't understand is that when tests run through the tycho-surefire-plugin seem to pick-up different classpaths than when they run from within eclipse. This is particularly evident with logging frameworks such as log4j or commons-logging that expect for log configurations to be on the classpath and I simply cannot find a way to configure both eclipse and tycho-surefire to behave the same.

Can someone point me to some documentation that explains how the two differ in this respect? 

Best regards,

Nikos Petalidis

Consulting Software Engineer

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