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building-native-image

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Build and troubleshoot GraalVM Native Image applications. Use this skill to build Java applications with GraalVM Native Image, configure CLI options, or resolve build or runtime issues.

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  1. Open your project in Codex.
  2. Copy the prompt below and paste it into your agent.
  3. Review the proposed files and risks before you approve installation.
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Source SKILL.md: https://github.com/oracle/graal/blob/HEAD/docs/reference-manual/native-image/assets/skills/building-native-image/SKILL.md

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​# Building Native Image

Prerequisites

  • Set JAVA_HOME to a GraalVM distribution if your Java program uses the Native Image SDK. If you do not know the path, ask the user to provide it. ​

Build and Run

  1. Compile your Java file with javac.
  2. Build the Native Image: 
    $JAVA_HOME/bin/native-image <app-name>
  3. Run the resulting executable: 
    ./app-name
  4. If Native Image cannot find your class file, set the classpath explicitly with the -cp option. ​

Troubleshooting

Reachability Metadata

If you encounter runtime errors related to reflection, JNI, resources, serialization, or dynamic proxies, consult references/reachability-metadata.md before attempting a fix. Use this reference for:

  • NoClassDefFoundError or MissingReflectionRegistrationError
  • MissingJNIRegistrationError
  • MissingResourceException (missing resource bundle)
  • Any user question about reflection, JNI, proxies, resources, resource bundles, or serialization in Native Image. ​

Native Image Options

To configure classpath, optimization level, output name, platform target, monitoring, or other CLI flags, see references/native-image-options.md.

Reference Files

TopicFile
Native Image CLI optionsreferences/native-image-options.md
Missing reachability metadatareferences/reachability-metadata.md