- java.lang.Object
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- picocli.codegen.aot.graalvm.ReflectionConfigGenerator
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public class ReflectionConfigGenerator extends Object
ReflectionConfigGenerator
generates a JSON String with the program elements that will be accessed reflectively in a picocli-based application, in order to compile this application ahead-of-time into a native executable with GraalVM.GraalVM has limited support for Java reflection and it needs to know ahead of time the reflectively accessed program elements.
The output of
ReflectionConfigGenerator
is intended to be passed to the-H:ReflectionConfigurationFiles=/path/to/reflect-config.json
option of thenative-image
GraalVM utility. This allows picocli-based applications to be compiled to a native image.Alternatively, the generated configuration files can be supplied to the
native-image
tool by placing them in aMETA-INF/native-image/
directory on the class path, for example, in a JAR file used in the image build. This directory (or any of its subdirectories) is searched for files with the namesjni-config.json
,reflect-config.json
,proxy-config.json
andresource-config.json
, which are then automatically included in the build. Not all of those files must be present. When multiple files with the same name are found, all of them are included.If necessary, it is possible to exclude classes with system property
picocli.codegen.excludes
, which accepts a comma-separated list of regular expressions of the fully qualified class names that should not be included in the resulting JSON String.- Since:
- 3.7.0
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Constructor Summary
Constructors Constructor Description ReflectionConfigGenerator()
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Method Summary
All Methods Static Methods Concrete Methods Modifier and Type Method Description static String
generateReflectionConfig(CommandLine.Model.CommandSpec... specs)
Returns a JSON String with the program elements that will be accessed reflectively for the specifiedCommandSpec
objects.static void
main(String... args)
Runs this class as a standalone application, printing the resulting JSON String to a file or toSystem.out
.
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Method Detail
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main
public static void main(String... args)
Runs this class as a standalone application, printing the resulting JSON String to a file or toSystem.out
.- Parameters:
args
- one or more fully qualified class names of@Command
-annotated classes.
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generateReflectionConfig
public static String generateReflectionConfig(CommandLine.Model.CommandSpec... specs) throws Exception
Returns a JSON String with the program elements that will be accessed reflectively for the specifiedCommandSpec
objects.- Parameters:
specs
- one or moreCommandSpec
objects to inspect- Returns:
- a JSON String in the format
required by the
-H:ReflectionConfigurationFiles=/path/to/reflect-config.json
option of the GraalVMnative-image
utility. - Throws:
NoSuchFieldException
- if a problem occurs while processing the specified specsIllegalAccessException
- if a problem occurs while processing the specified specsException
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