java - Files.newInputStream() inconsequential behaviour when the target Path is a directory? -

-

note: please run exact code below; no adaptations of it, in particular, not use file, bug tied new java.nio.file api

ok, not "question in need of answer" rather call witnesses...

scenario:

  • have directory on os, whatever is, know have privileges access -- in unix parlance, have @ least read access (which means can list entries in it); in code below, supposed path represented system.getproperty("java.io.tmpdir") fits bill;
  • have oracle jdk, or openjdk, 7+ installed; have java.nio.file @ disposal.

now, code below pretty simple: tries open new inputstream on directory using files.newinputstream(). code (also available here; added comments mine):

import java.io.ioexception; import java.io.inputstream; import java.nio.file.files; import java.nio.file.path; import java.nio.file.paths;  public final class main {     public static void main(final string... args)         throws ioexception     {         final path path = paths.get(system.getproperty("java.io.tmpdir"));         try (             final inputstream in = files.newinputstream(path); // fail_open         ) {             final byte[] buf = new byte[1024];             int bytesread;             while ((bytesread = in.read(buf)) != -1) // fail_read                 system.out.printf("%d bytes read\n", bytesread);         }     } }

ok, when run code, happens following jre/os combinations:

  • linux x86_64, oracle jdk 1.8.0_25: ioexception (is directory) @ fail_read;
  • linux x86_64, oracle jdk 1.7.0_72: ioexception (is directory) @ fail_read;
  • mac os x x86_64, oracle jdk 1.8.0_25: ioexception (is directory) @ fail_read;
  • windows 7, oracle jdk 1.8.0_25: accessdeniedexception @ fail_open (!!).

honestly, don't know piece of code. said in introduction, looking witnesses here. open bug openjdk this, seems pretty serious. mailed nio-dev mailing list problem.

well, question i'd have one: isdirectoryexception in jdk (inheriting filesystemexception)? have defined in one of projects account such problem. not sure why problem not considered "java guys"...

my observations (sorry, no other systems around here atm, later might add arm):

  • jdk 1.8.0_25, linux x86_64: java.io.ioexception: directory @ // fail_read.

i agree behavior unexpected, should not possible create inputstream directory in first place. i suggest file bug. if files.newinputstream doesn't state explicitly, behavior inconsistent rest of api.


Comments

Post a Comment

Popular posts from this blog

python - mat is not a numerical tuple : openCV error -

-
i have write down code showing error ma not getting it: please help: showing mat not numerical tuple: import cv import cv2 capture = cv2.videocapture("j.3gp") while(1): _, frame1 = capture.read() grayimage1 = cv2.cvtcolor(frame1, cv2.color_bgr2gray) _, frame2 = capture.read() grayimage2 = cv2.cvtcolor(frame2, cv2.color_bgr2gray) differenceimage = cv2.absdiff(grayimage1,grayimage2) thresholdimage = cv2.threshold(differenceimage,25,255,cv2.thresh_binary) cv2.imshow("difference image", differenceimage) cv2.imshow("threshold image", thresholdimage) cv2.imshow("image", frame1) k = cv2.waitkey(30) & 0xff error arising : ----------------------------------------------------------------------------------------- traceback (most recent call last): file "desk.py", line 15, in <module> cv2.imshow("threshold image", thresholdimage) typeerror: mat not numerical tuple ...
Read more

c# - MSAA finds controls UI Automation doesn't -

-
i'm working on automating windows application. i'm using teststack white framework. i've hit problem. program has 'window' object cannot see inside of. white shows no controls inside of it. inspect.exe shows no controls inside of either when running in ui automation mode. if switch inspect msaa see controls inside fine. there anyway me use msaa c# handle on these controls? if can identify msaa functions need, can use p/invoke call them c#. here's example article doing msaa: http://www.codeproject.com/articles/38906/ui-automation-using-microsoft-active-accessibility also, pinvoke.net can used identify iaccessible (msaa) functions: http://www.pinvoke.net/search.aspx?search=iaccessible&namespace=[all] here's answer along lines: msaa com-based? finally, alternative p/invoke, might able use tlbimp.exe create wrapper assembly oleacc.dll, , access msaa functions through it. i'm not sure if works msaa, it's worth try. as e...
Read more

wordpress - .htaccess: RewriteRule: bad flag delimiters -

-
pulling hair out on one. have following .htaccess file custom redirects in addition wordpress's default settings. when tested on local wamp server worked fine after moving production i'm not getting rewriterule: bad flag delimiters error in server log , after while site goes down internal server error any appreciated. in advance! <ifmodule mod_rewrite.c> rewriteengine on rewritebase / rewriterule ^rockford_weddings___welcome\.html$ /wedding/ [r=301,l] rewriterule ^blog/?$ /journal/ [r=301,l] rewriterule ^blog/(.*)$ /$1 [r=301,l] rewriterule ^portraitinvestment/?$ /portraitinvestment\.pdf [r=301,l] rewriterule ^weddinginvestment/?$ /weddinginvestment\.pdf [r=301,l] rewriterule ^holidaycards2014/?$ /holidaycards2014\.pdf [r=301,l] </ifmodule> # begin wordpress <ifmodule mod_rewrite.c> rewriteengine on rewritebase / rewriterule ^index\.php$ - [l] rewritecond %{request_filename} !-f rewritecond %{request_filename} !-d rewriterule . /index.php [l] </...
Read more