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Bundle ClassLoader Question [message #668258]

Wed, 04 May 2011 17:30

Mark Millard

Messages: 6
Registered: March 2011

Junior Member

What is the distinction between the org.eclipse.wb.core.classLoadingContributor extension point and the classLoader-library element used by the toolkit element in the org.eclipse.wb.core.toolkits extension point?

For example, if I have a JAR, myUI.jar, containing my components located in a bundle identified as com.testco.internal.wb, would the XML look like:

<extension point="org.eclipse.wb.core.toolkits">
    <toolkit id="com.testco.wb.nwt">
        <classLoader-library
            bundle="com.testco.internal.wb"
            jar="myUI.jar" />
    ...
    </toolkit>
</extension>

Note that this extension is being specified in a different plug-in, i.e. com.testco.wb.nwt.

Where does the org.eclipse.wb.core.classLoadingContributor extension point fall in this scenario?

Thank you for the clarification.

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Re: Bundle ClassLoader Question [message #668259 is a reply to message #668258]

Wed, 04 May 2011 17:39

Konstantin Scheglov

Messages: 555
Registered: July 2009

Senior Member

Well, name "classLoadingContributor" does not fully reflects its usage. It is used to load JavaInfo model class during "paste" operation. Paste happens in WB Core, which does not know about specific UI toolkits. So, these toolkits should inform Core that they provide classes for specific namespaces.

classLoader-library is used to contribute jar into toolkit runtime ClassLoader, i.e. put it near to java.awt.Component, etc. So, this allows to load for palette components which are not in classpath yet.

Konstantin Scheglov,
Google, Inc.

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