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The following page has been changed by DavidVanCouvering:
http://wiki.apache.org/db-derby/SharedComponentVersioningGuidelines

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  No visible impact  implies the following checkin requirements for any
  common code.
  
+    * Derby jar files of the same major version can continue to be mixed within the same JVM classpath without any difference in behavior from loading these jars in separate classloaders.
-    * derbyclient.jar, derby.jar, and derbytools.jar  of the same major version can continue to be mixed within the same JVM classpath without
- any difference in behavior from loading these jars in separate classloaders.
     * Jar file growth is commensurate with functionality improvement.
     * Replacing any jar with a jar of the same major version will not require any user classpath changes.