Maven Tycho Plugin Tests and slf4j

If your eclipse-test-plugin tests break in a maven Tycho build, you have to check the target/work/configuration folder for the log files.

Mybe you will find something like this:

!ENTRY de.dim.search.index.tests 2 0 2016-11-03 10:37:31.137
!MESSAGE Could not resolve module: de.dim.search.index.tests [13]
  Unresolved requirement: Require-Bundle: de.dim.search.index.core
    -> Bundle-SymbolicName: de.dim.search.index.core; bundle-version="1.2.0.201611030937"
       de.dim.search.index.core [9]
         Unresolved requirement: Import-Package: org.slf4j
           -> Export-Package: org.slf4j; bundle-symbolic-name="org.slf4j.api"; bundle-version="1.7.5.v20150828-1500"; version="1.7.5"; uses:="org.slf4j.spi"
              org.slf4j.api [11]
                Unresolved requirement: Import-Package: org.slf4j.impl; version="[1.6.0,1.7.6)"; resolution:="optional"
                Unresolved requirement: Require-Capability: org.slf4j.impl; filter:="(&(version>=1.6.0)(!(version>=1.7.6)))"
  Unresolved requirement: Fragment-Host: de.dim.search.index.core; bundle-version="1.2.0"
    -> Bundle-SymbolicName: de.dim.search.index.core; bundle-version="1.2.0.201611030937"


!ENTRY de.dim.search.index.core 2 0 2016-11-03 10:37:31.138
!MESSAGE Could not resolve module: de.dim.search.index.core [9]
  Unresolved requirement: Import-Package: org.slf4j
    -> Export-Package: org.slf4j; bundle-symbolic-name="org.slf4j.api"; bundle-version="1.7.5.v20150828-1500"; version="1.7.5"; uses:="org.slf4j.spi"
       org.slf4j.api [11]
         Unresolved requirement: Import-Package: org.slf4j.impl; version="[1.6.0,1.7.6)"; resolution:="optional"
         Unresolved requirement: Require-Capability: org.slf4j.impl; filter:="(&(version>=1.6.0)(!(version>=1.7.6)))"


!ENTRY org.slf4j.api 2 0 2016-11-03 10:37:31.138
!MESSAGE Could not resolve module: org.slf4j.api [11]
  Unresolved requirement: Import-Package: org.slf4j.impl; version="[1.6.0,1.7.6)"; resolution:="optional"
  Unresolved requirement: Require-Capability: org.slf4j.impl; filter:="(&(version>=1.6.0)(!(version>=1.7.6)))"

The resolution is to add the fragment ch.qos.logback.slf4j to the manifest and mark it as optional debendency.

Ensure that slf4j and logback is in you target platform. You will find it int the Eclipse Orbit.

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