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Starting plugin B will load and start plugin A and the both the classes and services from A are available for plugin B.
Special Cases
Xerces, Xalan and other endorsed packages
Some functionality is included in the vm but is intended to be user-replaceable. This includes the xml and xsl libraries. Usually you can't just include the version of xerces or xalan you want to use in your application, instead you need to put it in <geronimo_home>/lib/endorsed. Unfortunately this means all of geronimo will be using the same version of these libraries. A typical symptom of this problem might look like this:
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java.lang.ClassCastException: org.apache.xerces.parsers.XIncludeAwareParserConfiguration cannot be cast to org.apache.xerces.xni.parser.XMLParserConfiguration
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