SCR/ spec version 1.1-felix is causing NPE in XmlHandler
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Key: FELIX-2944
URL: https://issues.apache.org/jira/browse/FELIX-2944
Project: Felix
Issue Type: Bug
Components: Declarative Services (SCR)
Reporter: Pierre De Rop
Priority: Minor
This issue is described in the following post:
http://www.mail-archive.com/[email protected]/msg10138.html
and might also be related in the FELIX-1898 issue.
When using SCR (trunk) and the new Reference "updated" callback, we have to
specify the spec version "1.1-felix".
However, when using such version, we get the following NPE at runtime: (latest
scrplugin has been used to generate the scr xml descriptor):
java.lang.NullPointerException
at
org.apache.felix.scr.impl.metadata.XmlHandler.startElement(XmlHandler.java:237)
at
org.apache.felix.scr.impl.parser.KXml2SAXParser.parseXML(KXml2SAXParser.java:73)
at
org.apache.felix.scr.impl.BundleComponentActivator.loadDescriptor(BundleComponentActivator.java:227)
at
org.apache.felix.scr.impl.BundleComponentActivator.initialize(BundleComponentActivator.java:147)
at
org.apache.felix.scr.impl.BundleComponentActivator.<init>(BundleComponentActivator.java:111)
at
org.apache.felix.scr.impl.Activator.loadComponents(Activator.java:274)
at org.apache.felix.scr.impl.Activator.bundleChanged(Activator.java:192)
at
org.apache.felix.framework.util.EventDispatcher.invokeBundleListenerCallback(EventDispatcher.java:807)
at
org.apache.felix.framework.util.EventDispatcher.fireEventImmediately(EventDispatcher.java:729)
at
org.apache.felix.framework.util.EventDispatcher.fireBundleEvent(EventDispatcher.java:610)
at org.apache.felix.framework.Felix.fireBundleEvent(Felix.java:3833)
at org.apache.felix.framework.Felix.startBundle(Felix.java:1803)
at org.apache.felix.framework.Felix.setActiveStartLevel(Felix.java:1179)
at
org.apache.felix.framework.StartLevelImpl.run(StartLevelImpl.java:264)
at java.lang.Thread.run(Thread.java:662)
Notice that this exception is displayed on stdout, and it would be probably
better to log it using the log service;
>From log service, we then get the following exception:
.scr.impl.parser.ParseException: Exception during parsing
at
org.apache.felix.scr.impl.metadata.XmlHandler.startElement(XmlHandler.java:333)
at
org.apache.felix.scr.impl.parser.KXml2SAXParser.parseXML(KXml2SAXParser.java:73)
at
org.apache.felix.scr.impl.BundleComponentActivator.loadDescriptor(BundleComponentActivator.java:227)
at
org.apache.felix.scr.impl.BundleComponentActivator.initialize(BundleComponentActivator.java:147)
at
org.apache.felix.scr.impl.BundleComponentActivator.<init>(BundleComponentActivator.java:111)
at
org.apache.felix.scr.impl.Activator.loadComponents(Activator.java:274)
at org.apache.felix.scr.impl.Activator.bundleChanged(Activator.java:192)
at
org.apache.felix.framework.util.EventDispatcher.invokeBundleListenerCallback(EventDispatcher.java:807)
at
org.apache.felix.framework.util.EventDispatcher.fireEventImmediately(EventDispatcher.java:729)
at
org.apache.felix.framework.util.EventDispatcher.fireBundleEvent(EventDispatcher.java:610)
at org.apache.felix.framework.Felix.fireBundleEvent(Felix.java:3833)
at org.apache.felix.framework.Felix.startBundle(Felix.java:1803)
at org.apache.felix.framework.Felix.setActiveStartLevel(Felix.java:1179)
at
org.apache.felix.framework.StartLevelImpl.run(StartLevelImpl.java:264)
at java.lang.Thread.run(Thread.java:662)
I think that the root cause of the problem is that the scrplugin is generating
the following xml namespace:
http://www.osgi.org/xmlns/scr/v1.1.0-felix
but the scr runtime is expecting the following namespace:
http://felix.apache.org/xmlns/scr/v1.1.0-felix
so, there is a mismatch here.
The following patch seems to work and consists in fixing the class
XmlHandler.java, in the SCR:
The XmlHandler.NAMESPACE_URI_1_1_FELIX constant can be changed with the
following scheme (which must match the one generated by the scrplugin):
public static final String NAMESPACE_URI_1_1_FELIX =
"http://www.osgi.org/xmlns/scr/v1.1.0-felix";;
Or another option is to fix the scrplugin in order to use the felix.apache.org
scheme ?
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