How to use classes from rt.jar in an android application?

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http://stackoverflow.com – I am building an android application that references an external library. The problem is that library uses java.beans.PropertyDescriptor and this causes Dalvik exception at runtime. How can I solve this problem ? I found on another forum that it was possible to manipulate bytecode to load classes that are not known from Dalvik. Any suggestions ? Thanks (HowTos)