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If the arguments to these calls can be reduced to a constant, Native Image tries to resolve the target elements. The analysis intercepts calls to Class.forName(String), Class.forName(String, ClassLoader), Class.getDeclaredField(String), Class.getField(String), Class.getDeclaredMethod(String, Class), Class.getMethod(String, Class), Class.getDeclaredConstructor(Class), and Class.getConstructor(Class).
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See also the guide on assisted configuration of Java resources and other dynamic features.
#Java reflection load class manual#
Where the analysis fails, the program elements reflectively accessed at run time must be specified using a manual configuration. Native Image tries to resolve the target elements through a static analysis that detects calls to the Reflection API. (Note: loading classes with Class.forName(String) are included here since it is closely related to reflection.)
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Native Image has partial support for reflection and needs to know ahead-of-time the reflectively accessed program elements.Įxamining and accessing program elements through .* or loading classes with Class.forName(String) at run time requires preparing additional metadata for those program elements. Java reflection support (the .* API) enables Java code to examine its own classes, methods, fields and their properties at run time.
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