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The java.lang.reflect.InvocationTargetException occurs when a reflective method call is made to a class that results in an exception being thrown by the target method. This means that there is an error in the class being called.

If the start method of an application calls a reflective method that throws an InvocationTargetException, it means that the class being called has a problem that needs to be addressed. This can lead to an exception in the start method, as the application will not be able to start without successfully executing the reflective method.

For example, if the start method calls a reflective method that opens a file, and the file is not found or corrupt, the reflective method will throw an exception, which will be caught as an InvocationTargetException. This will prevent the application from starting, as it requires the file to be successfully opened in order to function properly.

Overall, the InvocationTargetException can lead to an exception in the start method of an application if the reflective method being called encounters an error that prevents the application from starting.