Github user jpullmann commented on the pull request:
https://github.com/apache/jena/pull/134#issuecomment-209474708
I created a new folder containing the initial Apache Karaf feature
definition (jena-osgi-features). We might think of providing different
distributions in the future each one defined by own feature. It has been reused
to define the bundle set for the integration test:
```
... features(maven().groupId("org.apache.jena")
.artifactId("jena-osgi-features").type("xml")
.classifier("features")
.version("3.1.0-SNAPSHOT"), "jena") ...
```
While testing I was reminded harshly why I removed xerces from the bundle
earlier: Apache Karaf (3* and 4*) ships with endorsed xerces 2.11.0 and exports
it per default to any installed bundle via boot delegation. The bundle cant's
suppress (not import) these classes, resulting in 2 versions available and
tests failing with:
```
Caused by: java.lang.VerifyError: (class:
org/apache/xerces/impl/dv/xs/AbstractDateTimeDV, method: <clinit> signature:
()V) Bad type in putfield/putstatic
at org.apache.xerces.impl.dv.xs.XSSimpleTypeDecl.<clinit>(Unknown
Source)[:]
at
org.apache.xerces.impl.dv.xs.SchemaDVFactoryImpl.createBuiltInTypes(Unknown
Source)[:]
at org.apache.xerces.impl.dv.xs.SchemaDVFactoryImpl.<clinit>(Unknown
Source)[:]
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native
Method)[:1.8.0_05]
at
sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)[:1.8.0_05]
at
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)[:1.8.0_05]
at
java.lang.reflect.Constructor.newInstance(Constructor.java:408)[:1.8.0_05]
at java.lang.Class.newInstance(Class.java:433)[:1.8.0_05]
at org.apache.xerces.impl.dv.ObjectFactory.newInstance(Unknown
Source)[:]
```
As expected, these configurations were proved to work:
1. Apache Karaf * with endorsed xerces-2.11.0 + plain Jena-osgi (without
xerces)
2. Apache Karaf 4.0.4 without xerces-2.11.0 + Jena-osgi with inline xerces
3. Apache Karaf 4.0.4 without xerces-2.11.0 + plain Jena-osgi with "xerces"
feature installed
In case 2,3 I removed "xerces-2.11.0.jar" from "lib/endorsed/" and from the
configuration of packages implicitly provided by runtime
(org.osgi.framework.bootdelegation) in "etc/config.properties".
Case 3 seems to confirm, that importing xerces might work. Users may either
install the "xerces" feature or resolve the indicated bundles manually:
```
<feature name="xerces" version="2.11.0">
<bundle>mvn:org.apache.servicemix.bundles/org.apache.servicemix.bundles.xerces/2.11.0_1</bundle><bundle>mvn:org.apache.servicemix.bundles/org.apache.servicemix.bundles.xmlresolver/1.2_5</bundle>
</feature>
```
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