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Due to the major changes in the app structure in v3 compared to v2, it will be highly unlikely that v2 plugins will be directly compatible in v3.
So existing plugins written for v2 will need to be rebuilt using the v3 structure and Java AP_IAPI.
Development Approach
The method of developing a v3 plugin remains the same as described in Developing Plugins. However, there is an additional feature in that you now have an option of using standard Java classes which are read directly from the classpath. The following table highlights the different approaches:
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