diff --git a/judge/client.py b/judge/client.py
index c39c840..da871c2 100644
--- a/judge/client.py
+++ b/judge/client.py
@@ -91,7 +91,7 @@ class JudgeClient(object):
                                 out_file=os.path.join(self._judge_base_path, str(test_case_id) + ".out"),
                                 args=execute_command[1:],
                                 env=["PATH=" + os.environ["PATH"]],
-                                use_sandbox=True)
+                                use_sandbox=self._language["use_sandbox"])
         if run_result["flag"] == 0:
             output_md5, r = self._compare_output(test_case_id)
             if r:
diff --git a/judge/language.py b/judge/language.py
index d0a0877..7a74f00 100644
--- a/judge/language.py
+++ b/judge/language.py
@@ -7,21 +7,24 @@ languages = {
         "src_name": "main.c",
         "code": 1,
         "compile_command": "/usr/bin/gcc -DONLINE_JUDGE -O2 -w -std=c99 {src_path} -lm -o {exe_path}/main",
-        "execute_command": "{exe_path}/main"
+        "execute_command": "{exe_path}/main",
+        "use_sandbox": True
     },
     2: {
         "name": "cpp",
         "src_name": "main.cpp",
         "code": 2,
         "compile_command": "/usr/bin/g++ -DONLINE_JUDGE -O2 -w -std=c++11 {src_path} -lm -o {exe_path}/main",
-        "execute_command": "{exe_path}/main"
+        "execute_command": "{exe_path}/main",
+        "use_sandbox": True
     },
     3: {
         "name": "java",
         "src_name": "Main.java",
         "code": 3,
         "compile_command": "/usr/bin/javac {src_path} -d {exe_path}",
-        "execute_command": "/usr/bin/java -cp {exe_path} -Djava.security.manager -Djava.security.policy==policy Main"
+        "execute_command": "/usr/bin/java -cp {exe_path} -Djava.security.manager -Djava.security.policy==policy Main",
+        "use_sandbox": False
     }
 }