Spring decouples an event publisher from its listener(s) through the
application event bus, linked by the event TYPE: publishEvent(new XEvent(...))
has no static edge to the @EventListener void on(XEvent e) that handles it
(usually a different class), so flows dead-end at the publish and the agent
reads to find the handlers. springEventEdges bridges each publishEvent(new X)
site -> every listener of X.
Two-pass, type-keyed (no name resolution, so precision is structural):
- Pass 1 builds Map<eventType, listenerMethod[]> from @EventListener /
@TransactionalEventListener methods (event type = first param type off the
node signature, or the @EventListener(X.class) value form) and the older
`implements ApplicationListener<X>` onApplicationEvent methods.
- Pass 2 links each publishEvent(new XEvent(...))'s enclosing method to every
listener of XEvent; multi-line `publishEvent(\n new X(...))` handled.
Key Java fact (probed): a method node's range INCLUDES its leading annotations
(startLine is the first @-line, not the `public void` decl), so the annotation
gate scans DOWNWARD from startLine bounded to consecutive @-lines, which can't
bleed into an adjacent method.
Surfaces as `dynamic: spring event` via the generic synth-edge fallback.
Validated 100% precision on two grep-confirmed repos exercising all listener
forms: halo (medium, 1254 java, 33 edges across 24 events, 0 publisher/listener
false positives, param-typed + (X.class) + ApplicationListener + fan-out) and
thombergs/code-examples (4 edges, adds @TransactionalEventListener); 0 on the
gson control (no Spring). Node-stable (pure edge synth). Suite 1617 green.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Colby McHenry
9b7ca2e394