diff --git a/cobol_testgen/runner.py b/cobol_testgen/runner.py
index 6714c2b..edb1d49 100644
--- a/cobol_testgen/runner.py
+++ b/cobol_testgen/runner.py
@@ -684,13 +684,17 @@ def _java_scene_label(dst_out_dir: Path) -> str:
     return cobol_scene.name
 
 
-def _run_java_scene(program_name: str, scene_id: str, outdir: str, temp_dir: str,
+def _run_java_scene(program_name: str, scene_id: str, java_out_dir, temp_dir: str,
                     src_in_dir: Path, dst_out_dir: Path,
                     fd_field_dicts: dict, open_dir: dict, select_info: dict,
-                    java_cfg: dict, log_dir: str | None = None) -> dict:
-    """单场景：准备 Java 入力 -> 运行 jar -> 收集出力 -> 与 COBOL 出力比对。"""
-    label = _java_scene_label(dst_out_dir)
-    java_out_dir = Path(outdir) / 'java' / label / 'output'
+                    java_cfg: dict, log_dir: str | None = None,
+                    label: str | None = None) -> dict:
+    """单场景：准备 Java 入力 -> 运行 jar -> 收集出力 -> 与 COBOL 出力比对。
+
+    java_out_dir: Java 出力目录（显式）。label 省略时由 dst_out_dir 推导。
+    """
+    label = label or _java_scene_label(dst_out_dir)
+    java_out_dir = Path(java_out_dir)
     java_work = Path(temp_dir) / f'java_{scene_id}'
 
     input_items = _input_fd_assign_len(fd_field_dicts, open_dir, select_info)
@@ -961,11 +965,14 @@ def run_all(program_name: str, outdir: str, temp_dir: str,
 
         # ── 3h. Java 文件式运行 + COBOL vs Java 出力比对（仅在有 Java 对应程序时）──
         if java_cfg:
+            _java_label = _java_scene_label(dst_out_dir)
             jrep = _run_java_scene(
-                program_name, scene_id, outdir, str(work_dir),
+                program_name, scene_id,
+                Path(outdir) / 'java' / _java_label / 'output',
+                str(work_dir),
                 src_in_dir, dst_out_dir,
                 fd_field_dicts, open_dir, select_info,
-                java_cfg, log_dir=log_dir,
+                java_cfg, log_dir=log_dir, label=_java_label,
             )
             java_reports.append(jrep)