[GitHub] [felix-atomos] sten-navie commented on issue #60: ClassCastException when starting org.eclipse.equinox.metatype as a "Standard Bundle"

[GitBox <gi...@apache.org>]

sten-navie commented on issue #60:
URL: https://github.com/apache/felix-atomos/issues/60#issuecomment-1163248236

   > > javax.xml.parsers.SAXParserFactory is in unnamed module of loader org.eclipse.osgi.internal.loader.EquinoxClassLoader @162a66a1)
   > 
   > This indicates to me that you may have another "normal" bundle that is exporting `javax.xml.parsers` package also?
   
   This was my first thought, so I created a simple setup with just the jars listed above. There are no other "normal" bundles than the metatype one.  Running `which 42 javax.xml.parsers.SAXParserFactory`(where 42 is the bundle id of the meta-type bundle gives me: 
   ```
   Loaded from: java.xml_11.0.14 [14]
   ```
   
   Interestingly enough  if I run `which 0 javax.xml.parsers.SAXParserFactory`, even though the the system bundle does not list a export for javax.xml.parsers, I get the response:
   ```
   Loaded from: boot class loader
   ```
   
   My understanding  of class loader delegation in equinox is very limited, but when running my "real" app in the debugger I observed the following:
   -  It seems that meta-type bundle  SAXParserFactory.class is in the "un-named" module and a has a EquinoxClassLoader. (Checked by putting a breakpoint where the metatype bundle activator starts tracking SaxParserFactories).
   -  The factory returned by equinox in org.eclipse.osgi.internal.framework.XMLParsingServiceFactory uses a SAXParserFactory.class from the "javax.xml" module and null class loader. (Checked by breaking in XMLParsingServiceFactory.createService and stepping into SaxParserFactory.newInstance which specifies the class).
   
   best regards,
   
     Sten
   


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