Upload app.py

app.py

@@ -1621,12 +1621,21 @@ async def run_build(job_id: str, build_id: str, task: str, signing: dict, app_co
             raise
         except Exception as e:
             log(f"Compat check note: {e}")
-        # JDK auto-select (era coverage: 11 legacy / 17 default / 21 modern)
+        # JDK auto-select (era coverage: 11 legacy / 17 default / 21 modern).
+        # Capacitor 8's own android library targets Java 21 bytecode, so any
+        # Cap8 project must compile on JDK 21 even though its AGP is 8.x
+        # (AGP rule alone would pick 17 and fail with "invalid source release: 21").
         jdk_home = None
         try:
             want_jdk = 17
             reason = "default"
-            if agp_major and agp_major >= 9:
+            try:
+                cap_ch = _detect_cap_major(search_root)
+            except Exception:
+                cap_ch = 0
+            if cap_ch and cap_ch >= 8:
+                want_jdk, reason = 21, f"Capacitor {cap_ch}.x"
+            elif agp_major and agp_major >= 9:
                 want_jdk, reason = 21, f"AGP {agp_major}.x"
             elif agp_major == 8:
                 want_jdk, reason = 17, f"AGP {agp_major}.x"
@@ -1639,9 +1648,8 @@ async def run_build(job_id: str, build_id: str, task: str, signing: dict, app_co
             elif gradle_major == 7:
                 want_jdk, reason = 11, f"Gradle {gradle_major}.x"
             else:
-                ch = _detect_cap_major(search_root)
-                if ch and ch >= 7:
-                    want_jdk, reason = 21, f"Capacitor {ch}.x"
+                if cap_ch and cap_ch >= 7:
+                    want_jdk, reason = 21, f"Capacitor {cap_ch}.x"
             cand = f"/opt/java{want_jdk}"
             if want_jdk != 17:
                 if Path(cand).exists():