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As I can't get the compiler node, How Can I set the classpath programatically.....
Please, explain yourself more clearly. You don't need to have access to compiler type's _node_ in order to alter classpath. The exact answer how to do such thing (programmatically) depends on what should be affected by that change (all sources, only one specific source, change classpath for the compilation step only etc etc) or what exactly are you trying to accomplish. For how-to questions, mailing list like dev@openide.netbeans.org seems more appropriate as more people can find a suitable solution for you or benefit from the answers.
verified, closed.