diff --git a/gitnexus/test/fixtures/lang-resolution/java-variadic-resolution/com/example/app/Main.java b/gitnexus/test/fixtures/lang-resolution/java-variadic-resolution/com/example/app/Main.java
index fea40d97f..88c3b71ac 100644
--- a/gitnexus/test/fixtures/lang-resolution/java-variadic-resolution/com/example/app/Main.java
+++ b/gitnexus/test/fixtures/lang-resolution/java-variadic-resolution/com/example/app/Main.java
@@ -14,5 +14,12 @@ public class Main {
         // 3-arg call: satisfies fixed prefix (level) + 2 varargs
         fmt.format(2, "hello", "world");
     }
+
+    public void badCall() {
+        Formatter fmt = new Formatter();
+        // 0-arg call: does NOT satisfy the required fixed prefix (int level)
+        // This should be rejected by arity — no CALLS edge to format
+        fmt.format();
+    }
 }
 
diff --git a/gitnexus/test/integration/resolvers/java.test.ts b/gitnexus/test/integration/resolvers/java.test.ts
index c5cd91e0b..a02a7e8a5 100644
--- a/gitnexus/test/integration/resolvers/java.test.ts
+++ b/gitnexus/test/integration/resolvers/java.test.ts
@@ -444,11 +444,23 @@ describe('Java variadic call resolution', () => {
 
   it('resolves 2-arg call to fixed-prefix varargs method format(int, String...) in Formatter.java', () => {
     const calls = getRelationships(result, 'CALLS');
-    const fmtCall = calls.find((c) => c.target === 'format');
+    const fmtCall = calls.find((c) => c.target === 'format' && c.source === 'run');
     expect(fmtCall).toBeDefined();
-    expect(fmtCall!.source).toBe('run');
     expect(fmtCall!.targetFilePath).toBe('com/example/util/Formatter.java');
   });
+
+  it('0-arg call to format(int, String...) still resolves in legacy mode (arity rejection is registry-only)', () => {
+    // In REGISTRY_PRIMARY_JAVA=1 mode, `requiredParameterCount = 1` causes
+    // `javaArityCompatibility` to return 'incompatible' for 0-arg calls,
+    // preventing the CALLS edge. In default (legacy) mode, arity is not
+    // enforced so the edge is created. This test documents the legacy
+    // behavior; the negative assertion is a flip-blocker for registry-primary.
+    const calls = getRelationships(result, 'CALLS');
+    const zeroArgFmtCall = calls.find(
+      (c) => c.target === 'format' && c.source === 'badCall',
+    );
+    expect(zeroArgFmtCall).toBeDefined();
+  });
 });
 
 // ---------------------------------------------------------------------------
@@ -477,6 +489,7 @@ describe('Java wildcard import resolution', () => {
     const calls = getRelationships(result, 'CALLS');
     const saveCall = calls.find((c) => c.target === 'save' && c.source === 'run');
     expect(saveCall).toBeDefined();
+    expect(saveCall!.targetFilePath).toBe('com/example/models/User.java');
   });
 });