Re: [wtp-incubator-dev] Apache Xalan and XML Security

[David M Williams <david_williams@xxxxxxxxxx>]

I'm not sure of a direct answer to your question, but do notice that 

org.eclipse.wst.xml.security.core.XmlSecurityPlugin.start

is, probably, trying to do too much, namely call 

org.apache.xml.security.Init.init

I don't know what Init.init does, but, the start method shouldn't really 
do anything. 
(Well, there's some cases it might have to do some small thing, but best 
if it doesn't). 
Not only does the start method need to be quick, it's JavaDoc warns of 
deadlock issues 
because of the way classloaders themselves acquire locks. There's no signs 
of deadlocks
in this one stack trace, but wonder if the behavior of classloaders is 
altered, by 
trying to do Init.init() in the start method. 

None of that says it is the wrong thing to do, and maybe it's required to 
be done there 
for reasons you know about, and there's definitely complicated issues with 
xerces classloading, 
but it would be interesting to move that Init.init() call to somewhere 
else, so the 
start method could finish quickly, and then security initialization take 
place 
after the plugin were started. 

HTH






From:
Dominik Schadow <info@xxxxxxxxxxxxxxxxx>
To:
WTP Incubator <wtp-incubator-dev@xxxxxxxxxxx>
Date:
11/09/2008 10:53 AM
Subject:
[wtp-incubator-dev] Apache Xalan and XML Security



Hi there,

I'm running into a strange problem with XML Security Tools. Apache XML
Security (org.apache.xml.security, at the moment checked in in WTP
incubator, not moved to Orbit yet) requires Apache Xalan 2.7.0 or 2.7.1.
Both Xalan versions are available in Eclipse Orbit. This Xalan plug-in
has an optional dependency on Apache Xerces (org.apache.xerces, versions
between 2.9.0 and 3.0.0). And with this dependency, XML Security could
not be initialized and fails with the following exception (I removed
some parts of it):


!MESSAGE An error occurred while automatically activating bundle
org.eclipse.wst.xml.security.core (362).
!STACK 0
org.osgi.framework.BundleException: Exception in
org.eclipse.wst.xml.security.core.XmlSecurityPlugin.start() of bundle
org.eclipse.wst.xml.security.core.
                 at
org.eclipse.osgi.framework.internal.core.BundleContextImpl.startActivator(BundleContextImpl.java:1028)
                 at
org.eclipse.osgi.framework.internal.core.BundleContextImpl.start(BundleContextImpl.java:984)
                 at
org.eclipse.osgi.framework.internal.core.BundleHost.startWorker(BundleHost.java:346)
                 at
org.eclipse.osgi.framework.internal.core.AbstractBundle.start(AbstractBundle.java:265)
                 at
org.eclipse.osgi.framework.util.SecureAction.start(SecureAction.java:400)
                 at
org.eclipse.core.runtime.internal.adaptor.EclipseLazyStarter.postFindLocalClass(EclipseLazyStarter.java:111)
                 at
org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findLocalClass(ClasspathManager.java:427)
                 at
org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.findLocalClass(DefaultClassLoader.java:193)
                 at
org.eclipse.osgi.framework.internal.core.BundleLoader.findLocalClass(BundleLoader.java:368)
                 at
org.eclipse.osgi.framework.internal.core.BundleLoader.findClassInternal(BundleLoader.java:444)
                 at
org.eclipse.osgi.framework.internal.core.BundleLoader.findClass(BundleLoader.java:397)
                 at
org.eclipse.osgi.framework.internal.core.BundleLoader.findClass(BundleLoader.java:385)
                 at
org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.loadClass(DefaultClassLoader.java:87)
                 at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
Caused by: javax.xml.parsers.FactoryConfigurationError: Provider
org.apache.xerces.jaxp.DocumentBuilderFactoryImpl not found
                 at
javax.xml.parsers.DocumentBuilderFactory.newInstance(DocumentBuilderFactory.java:104)
                 at org.apache.xml.security.Init.init(Unknown Source)
                 at
org.eclipse.wst.xml.security.core.XmlSecurityPlugin.start(XmlSecurityPlugin.java:76)
                 at
org.eclipse.osgi.framework.internal.core.BundleContextImpl$2.run(BundleContextImpl.java:1009)
                 at java.security.AccessController.doPrivileged(Native 
Method)
                 at
org.eclipse.osgi.framework.internal.core.BundleContextImpl.startActivator(BundleContextImpl.java:1003)
                 ... 56 more
Root exception:
javax.xml.parsers.FactoryConfigurationError: Provider
org.apache.xerces.jaxp.DocumentBuilderFactoryImpl not found
                 at
javax.xml.parsers.DocumentBuilderFactory.newInstance(DocumentBuilderFactory.java:104)
                 at org.apache.xml.security.Init.init(Unknown Source)
                 at
org.eclipse.wst.xml.security.core.XmlSecurityPlugin.start(XmlSecurityPlugin.java:76)
                 at
org.eclipse.osgi.framework.internal.core.BundleContextImpl$2.run(BundleContextImpl.java:1009)
                 at java.security.AccessController.doPrivileged(Native 
Method)

After removing this optional dependency XML Security Tools is working.
In my environment, Apache Xerces 2.9.0 is available. Any ideas? Why does
an optional dependency cause such problems?

Thanks, Dominik
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