Not ableto migrate from eclipse 3.x to eclipse 4.x -

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we've rcp application based on 3.x api trying migrate eclipse 4.x. problem some part of code using eclipse internal classes present in workbench.jar . added workbench.jar jar previous eclipse(helios) new eclipse(kepler) resolved errors .but application not able start.so wanted know correct approach

1.can have 2 workbench.jar jars(3.105 , 3.6) in application.

2.if no there way search internal classes using in new jars using internal classes related layout , prespectives(like : org.eclise.ui.internal.layyoutpart ,org.eclipse.internal.ui.perspectives)

3.is there way using can avoid rewriting code.

eclipse 4.x substantial rewrite there little chance internal classes 3.x going work. multiple workbench jars not going work in case.

the layout , perspective classes mention not exist in eclipse 4.x, going have rewrite code.

see eclipse api rules of engagement


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