[eclipse-dev] XML Parsing In an Eclipse 3.0 Plugin

[Marc Boorshtein <marc.boorshtein@xxxxxxxxxxxxxxx>]

Hello,

I am trying to implement a plugin that utilizes JAXP in J2SE 1.4.  I  
need to validate the XML using XML Schema.  I am using the method  
defined on sun's website  
"http://java.sun.com/j2ee/1.4/docs/tutorial/doc/JAXPDOM8.html";.

In order to run a stand-alone application which utilizes XML Schema in  
the way sun defines I needed to use Xercese 2.6 and utilize the  
"- 
Djavax.xml.parsers.DocumentBuilderFactory=org.apache.xerces.jaxp.Documen 
tBuilderFactoryImpl" JVM argument.  When I run an eclipse workbench  
using the same code, with all xercese jars added and the document  
builder factory argument set, the runtime workbench crashes and the  
following exception is generated:
!SESSION Jan 20, 2004 21:31:07.999  
---------------------------------------------
java.version=1.4.1_01
java.vendor=Apple Computer, Inc.
BootLoader constants: OS=macosx, ARCH=ppc, WS=carbon, NL=en_US
Command-line arguments: -pdelaunch -dev bin -os macosx -ws carbon -arch  
ppc -nl en_US
!ENTRY org.eclipse.core.runtime 4 13 Jan 20, 2004 21:31:08.01
!MESSAGE Unable to locate application extension: null
!STACK 0
java.lang.RuntimeException: Unable to locate application extension: null
	at  
org.eclipse.core.internal.runtime.PlatformActivator$1.run(PlatformActiva 
tor.java:205)
	at  
org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java: 
85)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at  
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.jav 
a:39)
	at  
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessor 
Impl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:324)
	at org.eclipse.core.launcher.Main.basicRun(Main.java:279)
	at org.eclipse.core.launcher.Main.run(Main.java:742)
	at org.eclipse.core.launcher.Main.main(Main.java:581)

If I don't include the document parser factory flag, then I receive the  
following exception :
java.lang.IllegalArgumentException: No attributes are implemented
	at  
org.apache.crimson.jaxp.DocumentBuilderFactoryImpl.setAttribute(Document 
BuilderFactoryImpl.java:93)
	.
	.
	.
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native  
Method)
	at  
sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorA 
ccessorImpl.java:39)
	at  
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingCons 
tructorAccessorImpl.java:27)
	at java.lang.reflect.Constructor.newInstance(Constructor.java:274)
	at java.lang.Class.newInstance0(Class.java:306)
	at java.lang.Class.newInstance(Class.java:259)
	at  
org.eclipse.core.internal.registry.ConfigurationElement.createExecutable 
Extension(ConfigurationElement.java:143)
	at  
org.eclipse.core.internal.registry.ConfigurationElement.createExecutable 
Extension(ConfigurationElement.java:125)
	at  
org.eclipse.core.internal.registry.ConfigurationElement.createExecutable 
Extension(ConfigurationElement.java:114)
	at  
org.eclipse.ui.internal.WorkbenchPlugin.createExtension(WorkbenchPlugin. 
java:153)
	at  
org.eclipse.ui.internal.dialogs.WorkbenchWizardElement.createExecutableE 
xtension(WorkbenchWizardElement.java:96)
	at  
org.eclipse.ui.internal.ide.NewWizardShortcutAction.run(NewWizardShortcu 
tAction.java:67)
	at org.eclipse.jface.action.Action.runWithEvent(Action.java:842)
	at  
org.eclipse.jface.action.ActionContributionItem.handleWidgetSelection(Ac 
tionContributionItem.java:509)
	at  
org.eclipse.jface.action.ActionContributionItem.access$2(ActionContribut 
ionItem.java:461)
	at  
org.eclipse.jface.action.ActionContributionItem$5.handleEvent(ActionCont 
ributionItem.java:408)
	at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:82)
	at org.eclipse.swt.widgets.Widget.notifyListeners(Widget.java:1050)
	at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:2202)
	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:1914)
	at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:1506)
	at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:1482)
	at  
org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java: 
246)
	at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:139)
	at  
org.eclipse.ui.internal.ide.IDEApplication.run(IDEApplication.java:47)
	at  
org.eclipse.core.internal.runtime.PlatformActivator$1.run(PlatformActiva 
tor.java:226)
	at  
org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java: 
85)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at  
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.jav 
a:39)
	at  
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessor 
Impl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:324)
	at org.eclipse.core.launcher.Main.basicRun(Main.java:279)
	at org.eclipse.core.launcher.Main.run(Main.java:742)
	at org.eclipse.core.launcher.Main.main(Main.java:581)

The three attributes in question seem to be:
http://java.sun.com/xml/jaxp/properties/schemaLanguage
http://www.w3.org/2001/XMLSchema
http://java.sun.com/xml/jaxp/properties/schemaSource

If the IBM version of Xercese is the only version that is available, is  
there a way to utilize it to check schema?  If not, is there an  
alternative JAXP compatible parser that will run inside of eclipse?

Your help is greatly appreciated.


------------------------------------------------------------------------ 
--------------------------
Marc Boorshtein
Software Engineer, Octet String
marc.boorshtein@xxxxxxxxxxxxxxx