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For using classic libraries and classic applets in other connected applications like extended applets and web applications SIO Proxy classes are used. These sources for these classes could be generated by the plugin. However after generation of these sources with "Generate SIO Proxies" menu item classic applet project cannot be built anymore. This is because generated Proxy classes use Java Card Connected API and can't be compiled with Classic API bootclasspath. I suggest to fix build procedure for classic applets and libraries so that they compile their classes in two steps: 1. All classic sources (excludes="**/proxy/*) are compiled with Classic API bootclasspath. 2. Optional: if use.my.proxies=true then proxy sources (includes="**/proxy/*) are compiled with Connected API classpath.
Should be easy enough to do - the property javacard.bootclasspath is available in the environment and contains the Connected API classes.
This issue is fixed.