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generate-classes

Compile SkyWalking DSL scripts for MAL, OAL, LAL, or Hierarchy and save the generated .class files for inspection. Choose one DSL or generate classes for all four, then locate the output and use javap to examine bytecode.

OriginalShow the original description

Generate bytecode classes from DSL scripts (MAL, OAL, LAL, Hierarchy). Runs the compiler and dumps .class files for inspection.

apache/skywalking24,978 stars(GitHub 24,978 + cccskills 0)

Run score Not tested

See how to install

Good for

  • Inspecting classes generated from MAL expressions
  • Examining OAL metrics or dispatcher bytecode
  • Generating LAL or Hierarchy classes for debugging
  • Producing class files for all supported DSLs

Overview

What it does

This skill compiles SkyWalking DSL scripts for MAL, OAL, LAL, or Hierarchy and writes the generated .class files to disk for inspection. You can select one DSL with an argument or use all to generate classes for all four in sequence. For each target, the skill runs the corresponding Maven test command and provides the output directory. To examine the generated bytecode, it shows how to use javap -c -p on a class file.

When it helps

Use it when you want to see how a DSL definition becomes Java classes or investigate compiler output. You can focus on MAL expressions, OAL metrics, dispatchers and builders, LAL filters and extractors, or Hierarchy rules.

Example requests

  • “Generate the MAL classes and tell me where they were saved.”
  • “Generate and inspect the OAL dispatcher classes.”
  • “Generate class files for all four DSLs.”

Notes

Generation requires Maven Wrapper and running the test associated with the selected DSL. Files are written to the specified test resources or target directories. The skill also documents a Maven clean command for removing generated classes.

This overview was written by AI (OpenAI Codex) from the public SKILL.md. Check the original below for the exact behavior.

Document check

AI checked the SKILL.md for operations that need care and for setup requirements. The score comes only from actually running the skill (hands-on test).

SafetyAre sending data, deleting files, and running commands disclosed?
BPartly lackingTests create files and Maven clean removes them; no confirmation step is described.
Easy setupDoes it need few tools or API keys, and are they documented?
BPartly lackingMaven Wrapper is required; other prerequisites such as the JDK are not stated.

Not counted in the score. Rated by AI (OpenAI Codex) as of Oct 29, 2026. Treat it as a guide and read the original before installing.

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Files included (1)

  • SKILL.md1.9 KB

SKILL.md (original)

Review the instructions the agent will receive before you install.

Generate DSL Classes

Run the v2 compiler (ANTLR4 + Javassist) to generate bytecode classes from DSL scripts and dump .class files to disk for inspection.

Commands by argument

mal — MAL expression classes

./mvnw test -pl oap-server/analyzer/dsl-scripts-test \
  -Dtest=MALExpressionExecutionTest -DfailIfNoTests=false -Dcheckstyle.skip

Output location: oap-server/analyzer/dsl-scripts-test/src/test/resources/scripts/mal/**/*.generated-classes/

oal — OAL metrics/dispatcher/builder classes

./mvnw test -pl oap-server/oal-rt \
  -Dtest=RuntimeOALGenerationTest -DfailIfNoTests=false -Dcheckstyle.skip

Output location: oap-server/oal-rt/target/test-classes/metrics/, metrics/builder/, dispatcher/

lal — LAL filter/extractor classes

./mvnw test -pl oap-server/analyzer/dsl-scripts-test \
  -Dtest=LALExpressionExecutionTest -DfailIfNoTests=false -Dcheckstyle.skip

Output location: oap-server/analyzer/dsl-scripts-test/src/test/resources/scripts/lal/**/*.generated-classes/

hierarchy — Hierarchy rule classes

./mvnw test -pl oap-server/analyzer/dsl-scripts-test \
  -Dtest=HierarchyRuleExecutionTest -DfailIfNoTests=false -Dcheckstyle.skip

Output location: oap-server/analyzer/dsl-scripts-test/src/test/resources/scripts/hierarchy-rule/*.generated-classes/

all or no argument — generate all DSLs

Run all four commands above sequentially.

After generation

Print the output location for the requested DSL so the user knows where to find the generated .class files. Use javap to decompile:

javap -c -p <path-to-class-file>

Cleaning generated classes

./mvnw clean -pl oap-server/analyzer/dsl-scripts-test

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