"%24%7B%28%23a%3D%40" OR "$\{\(#a=@" OR "%24%7B%40java" OR "$\{@java" OR "u0022java" OR "%2F%24%7B%23" OR "\/$\{#" OR "new\+java." OR "getRuntime\(\).exec\(" OR "getRuntime%28%29.exec%28"