Java API Discovery

Efficiently discover actual API signatures from compiled JARs using javap. This approach eliminates guessing and trial-and-error by examining the compiled bytecode directly.

When to Use This Skill

• Encountering compilation errors from incorrect method assumptions
• Working with unfamiliar Java SDKs or libraries
• Need to understand pagination patterns (offset vs cursor)
• Dealing with union types or polymorphic responses
• Verifying field existence before writing code
• Documentation is incomplete, outdated, or ambiguous

Core Workflow

1. Find the JAR