GitHub user neykov opened a pull request:

    https://github.com/apache/karaf/pull/241

    [KARAF-4720] Prevent NamespaceHandler implementations from hijacking 
namespaces

    NamespaceHandler implementations in Karaf will return a schema location 
from getSchemaLocation even for namespaces they don't own, essentially 
replacing the xsd that corresponds to the requested namespace. That leads to 
errors that make no sense and inability to use the bundles that implement the 
handlers.
    
    Triggered by https://issues.apache.org/jira/browse/ARIES-1503 and 
https://github.com/apache/aries/commit/9a1ff22cbd29006d24a42e3e1274dfa493501ed9 
in particular.
    
    The error I was seeing when trying to use the JAAS module:
    ```
    18:07:39,892 ERROR  16 ntainer.BlueprintContainerImpl [pool-9-thread-1 ] 
Unable to start blueprint container for bundle 
org.apache.brooklyn.rest-resources/0.10.0.SNAPSHOT
    org.xml.sax.SAXParseException; systemId: 
bundle://31.0:1/org/apache/karaf/jaas/blueprint/config/karaf-jaas-1.1.0.xsd; 
lineNumber: 24; columnNumber: 66; src-import.3.1: The namespace attribute, 
'http://cxf.apache.org/configuration/beans', of an <import> element information 
item must be identical to the targetNamespace attribute, 
'http://karaf.apache.org/xmlns/jaas/v1.1.0', of the imported document.
        at 
com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.createSAXParseException(ErrorHandlerWrapper.java:198)[:1.7.0_80]
        at 
com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.error(ErrorHandlerWrapper.java:134)[:1.7.0_80]
        at 
com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:437)[:1.7.0_80]
        at 
com.sun.org.apache.xerces.internal.impl.xs.traversers.XSDHandler.reportSchemaErr(XSDHandler.java:4162)[:1.7.0_80]
        at 
com.sun.org.apache.xerces.internal.impl.xs.traversers.XSDHandler.reportSchemaError(XSDHandler.java:4145)[:1.7.0_80]
        at 
com.sun.org.apache.xerces.internal.impl.xs.traversers.XSDHandler.constructTrees(XSDHandler.java:822)[:1.7.0_80]
        at 
com.sun.org.apache.xerces.internal.impl.xs.traversers.XSDHandler.constructTrees(XSDHandler.java:1120)[:1.7.0_80]
        at 
com.sun.org.apache.xerces.internal.impl.xs.traversers.XSDHandler.parseSchema(XSDHandler.java:620)[:1.7.0_80]
        at 
com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaLoader.loadSchema(XMLSchemaLoader.java:617)[:1.7.0_80]
        at 
com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaLoader.loadGrammar(XMLSchemaLoader.java:575)[:1.7.0_80]
        at 
com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaLoader.loadGrammar(XMLSchemaLoader.java:541)[:1.7.0_80]
        at 
com.sun.org.apache.xerces.internal.jaxp.validation.XMLSchemaFactory.newSchema(XMLSchemaFactory.java:252)[:1.7.0_80]
        at 
org.apache.aries.blueprint.namespace.NamespaceHandlerRegistryImpl$NamespaceHandlerSetImpl.createSchema(NamespaceHandlerRegistryImpl.java:641)[16:org.apache.aries.blueprint.core:1.6.2]
        at 
org.apache.aries.blueprint.namespace.NamespaceHandlerRegistryImpl$NamespaceHandlerSetImpl.doGetSchema(NamespaceHandlerRegistryImpl.java:458)[16:org.apache.aries.blueprint.core:1.6.2]
        at 
org.apache.aries.blueprint.namespace.NamespaceHandlerRegistryImpl$NamespaceHandlerSetImpl.getSchema(NamespaceHandlerRegistryImpl.java:443)[16:org.apache.aries.blueprint.core:1.6.2]
        at 
org.apache.aries.blueprint.container.BlueprintContainerImpl.doRun(BlueprintContainerImpl.java:343)[16:org.apache.aries.blueprint.core:1.6.2]
        at 
org.apache.aries.blueprint.container.BlueprintContainerImpl.run(BlueprintContainerImpl.java:276)[16:org.apache.aries.blueprint.core:1.6.2]
        at 
org.apache.aries.blueprint.container.BlueprintExtender.createContainer(BlueprintExtender.java:300)[16:org.apache.aries.blueprint.core:1.6.2]
        at 
org.apache.aries.blueprint.container.BlueprintExtender.createContainer(BlueprintExtender.java:269)[16:org.apache.aries.blueprint.core:1.6.2]
        at 
org.apache.aries.blueprint.container.BlueprintExtender.createContainer(BlueprintExtender.java:265)[16:org.apache.aries.blueprint.core:1.6.2]
        at 
org.apache.aries.blueprint.container.BlueprintExtender.modifiedBundle(BlueprintExtender.java:255)[16:org.apache.aries.blueprint.core:1.6.2]
        at 
org.apache.aries.util.tracker.hook.BundleHookBundleTracker$Tracked.customizerModified(BundleHookBundleTracker.java:500)[20:org.apache.aries.util:1.1.1]
        at 
org.apache.aries.util.tracker.hook.BundleHookBundleTracker$Tracked.customizerModified(BundleHookBundleTracker.java:433)[20:org.apache.aries.util:1.1.1]
        at 
org.apache.aries.util.tracker.hook.BundleHookBundleTracker$AbstractTracked.track(BundleHookBundleTracker.java:725)[20:org.apache.aries.util:1.1.1]
        at 
org.apache.aries.util.tracker.hook.BundleHookBundleTracker$Tracked.bundleChanged(BundleHookBundleTracker.java:463)[20:org.apache.aries.util:1.1.1]
        at 
org.apache.aries.util.tracker.hook.BundleHookBundleTracker$BundleEventHook.event(BundleHookBundleTracker.java:422)[20:org.apache.aries.util:1.1.1]
        at 
org.apache.felix.framework.util.SecureAction.invokeBundleEventHook(SecureAction.java:1179)[org.apache.felix.framework-5.4.0.jar:]
        at 
org.apache.felix.framework.util.EventDispatcher.createWhitelistFromHooks(EventDispatcher.java:731)[org.apache.felix.framework-5.4.0.jar:]
        at 
org.apache.felix.framework.util.EventDispatcher.fireBundleEvent(EventDispatcher.java:486)[org.apache.felix.framework-5.4.0.jar:]
        at 
org.apache.felix.framework.Felix.fireBundleEvent(Felix.java:4541)[org.apache.felix.framework-5.4.0.jar:]
        at 
org.apache.felix.framework.Felix.startBundle(Felix.java:2172)[org.apache.felix.framework-5.4.0.jar:]
        at 
org.apache.felix.framework.BundleImpl.start(BundleImpl.java:998)[org.apache.felix.framework-5.4.0.jar:]
        at 
org.apache.felix.framework.BundleImpl.start(BundleImpl.java:984)[org.apache.felix.framework-5.4.0.jar:]
        at 
org.apache.karaf.features.internal.service.FeaturesServiceImpl.startBundle(FeaturesServiceImpl.java:1286)[10:org.apache.karaf.features.core:4.0.6]
        at 
org.apache.karaf.features.internal.service.Deployer.deploy(Deployer.java:846)[10:org.apache.karaf.features.core:4.0.6]
        at 
org.apache.karaf.features.internal.service.FeaturesServiceImpl.doProvision(FeaturesServiceImpl.java:1176)[10:org.apache.karaf.features.core:4.0.6]
        at 
org.apache.karaf.features.internal.service.FeaturesServiceImpl$1.call(FeaturesServiceImpl.java:1074)[10:org.apache.karaf.features.core:4.0.6]
        at java.util.concurrent.FutureTask.run(FutureTask.java:262)[:1.7.0_80]
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)[:1.7.0_80]
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)[:1.7.0_80]
        at java.lang.Thread.run(Thread.java:745)[:1.7.0_80]
    
    ```

You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/neykov/karaf fix/namespace-handlers

Alternatively you can review and apply these changes as the patch at:

    https://github.com/apache/karaf/pull/241.patch

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #241
    
----
commit 6ec2499ab41636034c3e4526ed933eb4ab1048c1
Author: Svetoslav Neykov <svetoslav.ney...@cloudsoftcorp.com>
Date:   2016-09-20T08:52:16Z

    Prevent NamespaceHandler implementations from hijacking namespaces
    
    NamespaceHandler implementations in Karaf will return a schema location 
from getSchemaLocation even for namespaces they don't own, essentially 
replacing the xsd that corresponds to the requested namespace. That leads to 
errors that make no sense and inability to use the bundles that implement the 
handlers.
    
    Triggered by 
https://github.com/apache/aries/commit/9a1ff22cbd29006d24a42e3e1274dfa493501ed9

----


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