java - Unable to launch jar with execl() -


i given decrypt.jar , encrypt.jar file, used prepare files before transmitting.

when launch terminal , type:

/usr/bin/java -jar /path/to/jar/decrypt.jar

i output:

no input file specified

which ok! jar works. in code, when launch jar execl(), output:

error: not find or load main class util.decrypt.jar decryptor exited 0

notice issue here java tried launch class path jar (the path util/decrypt.jar, , executed class util.decrypt.jar)

my code:

bool decrypt_file(const std::string& file) {     int result;     int pipefd[2];     file *cmd_output;     char buf[1024];     int status;      result = pipe(pipefd);     if (result < 0) {         throw "pipe error!";     }      pid_t pid = fork(); /* create child process */     const std::string decryptjar = "util/decrypt.jar";     int ex;     if ( !fileexists(decryptjar) ) throw "file decryptor not exist!";      switch (pid) {         case -1: /* error */ #ifdef _debug             std::cout<<"fork() failed!\n"; #endif             return false;         case 0: /* child process */             dup2(pipefd[1], stdout_fileno); /* duplicate writing end stdout */             close(pipefd[0]);             close(pipefd[1]);              //getjava() returns "/usr/bin/java"             ex = execl(config::getinstance().getjava().c_str(), "-jar", decryptjar.c_str(), file.c_str(), null); /* execute program */ #ifdef _debug             std::cout << "execl() failed! returned "<<ex<<", errno = "<<errno<<"\n"; /* execl doesn't return unless there's error */             //todo if errno 2, java not found on system, let user know! #endif             return false;         default: /* parent process */             int status;             close(pipefd[1]); /* close writing end of pipe */             cmd_output = fdopen(pipefd[0], "r"); #ifdef _debug             if (fgets(buf, sizeof buf, cmd_output)) {                 std::string str(buf);                 std::cout<<"output: "<<str<<"\n";             } #endif             while (!wifexited(status)) {                 waitpid(pid, &status, 0); /* wait process complete */             }  #ifdef _debug             std::cout << "decryptor exited " << wexitstatus(status) << "\n"; #endif             return true;     } }

the manifest inside jar correct (it generated eclipse):

manifest-version: 1.0 class-path: . main-class: com.{...}.decryptor

add:

trying change path absolute path of jar didn't fix problem.

const std::string decryptjar = workingdir() + "/util/decrypt.jar";

solved

stupid mistake side, first argument should, convention, path executable.

so

ex = execl(config::getinstance().getjava().c_str(), "-jar", decryptjar.c_str(), file.c_str(), null); /* execute program */

should be

ex = execl(config::getinstance().getjava().c_str(), decryptjar.c_str(), "-jar", decryptjar.c_str(), file.c_str(), null); /* execute program */

what happened java took "-jar" path, command actually

java pathtojar input

instead of

java -jar pathtojar input

edit: corrected code snippet:

bool decrypt_file(const std::string& javapath, const std::string& file) {         int result, status;         int pipefd[2];         file *cmd_output;         char buf[1024];         int ex;         const std::string decryptjar = workingdir() + "/util/decrypt.jar";          result = pipe(pipefd);         if (result < 0) {             throw "pipe error!";         }          pid_t pid = fork(); /* create child process */         if ( !fileexists(decryptjar) ) throw "file decryptor not exist!";          switch (pid) {             case -1: /* error */     #ifdef _debug                 std::cout<<"fork() failed!\n";     #endif                 return false;             case 0: /* child process */                 dup2(pipefd[1], stdout_fileno); /* duplicate writing end stdout */                 close(pipefd[0]);                 close(pipefd[1]);                  ex = execl(javapath.c_str(), decryptjar.c_str(), "-jar", decryptjar.c_str(), file.c_str(), null); /* execute program */          #ifdef _debug                 std::cout << "execl() failed! returned "<<ex<<", errno = "<<errno<<"\n"; /* execl doesn't return unless there's error */     #endif                 if ( errno == 2 ) {                     std::cout<<"java not found! check if java installed and/or if path in config file points correct java installation!\n\n";                 }                 return false;             default: /* parent process */                 close(pipefd[1]); /* close writing end of pipe */                 cmd_output = fdopen(pipefd[0], "r");     #ifdef _debug                 if (fgets(buf, sizeof buf, cmd_output)) {                     std::string str(buf);                     if ( str != "ok" )                         std::cout<<"---decrypt output: "<<str<<"\n";                 }     #endif                 while (!wifexited(status)) {                     waitpid(pid, &status, 0); /* wait process complete */                 }      #ifdef _debug                 std::cout << "decryptor exited " << wexitstatus(status) << "\n";     #endif                 return true;         }     }

Comments

Post a Comment

Popular posts from this blog

html - Outlook 2010 Anchor (url/address/link) -

i'm trying link specific pdf page msoutlook'10 or msword'10, #page=... anchor particularly useful , works fine elsewhere. unfortunately when click [ctr-k] in outlook or winword, links re-formatted assuming unc path. pdf file located on shared drive. using "file:" prefix links open pdf in adobe reader (outside of browser), , "http:" open inside browser. issue seem need open in browser "file:" prefix in order anchor work. know anchors work inside browser. outlook uses windows/explorer default program (based on file extension) seems open in adobe reader neglecting anchor. is aware of solution, link specific page or bookmark of shared-pdf ms outlook and/or winword link? common references: mailermailer.com/...anchor-tags-html-emails campaignmonitor.com/...anchor-links-in-email-newsletters/ stackoverflow.com/...anchor-in-pdf-document
Read more

javascript - Why does running this loop 9 times take 100x longer than running it 8 times? -

consider code: test = function() { } t = new test(); (var = 0; < 8; i++) { result = t instanceof test; } if change number of iterations 8 9 , loop take 100 times longer complete in latest version of firefox (41.0.1). tested on 2 different pcs , magic limit 8. here jsperf test used: http://jsperf.com/instanceof-8-times-vs-9-times does have idea why might happen? seems specific instanceof . not happen if else object, example check property. note: filed bugzilla bug this. jan de mooij mozilla team has posted details in bugzilla thread . here's simplistic interpretation of highly technical answers: in i < 8 case, firefox smart enough hoist result = t instanceof test; statement out of loop (according tests, doesn't seem omit altogether). in i < 9 case, apparently doesn't optimization . why? reason not clear, related fact 9 iterations threshold above function considered "hot" enough run through jit compiler. i < 8 cas...
Read more

Getting gateway time-out Rails app with Nginx + Puma running on Digital Ocean -

following this guide setup app on digital ocean droplet, not working. site not loading , it's throwing: "gateway time-out". the puma server works, since ps aux | grep puma prints: root 15878 0.0 0.4 376832 2168 ? sl 12:50 0:00 puma 2.13.4 (unix:///var/www/myapp/shared/tmp/sockets/myapp-puma.sock) [20150930164940] root 15881 0.0 0.7 903676 3692 ? sl 12:50 0:06 puma: cluster worker 0: 15878 [20150930164940] root 24654 0.0 0.1 11748 916 pts/2 s+ 18:00 0:00 grep --color=auto puma my nginx config: user root; worker_processes 1; events { worker_connections 1024; } http { upstream puma { server unix:///var/www/myapp/shared/tmp/sockets/myapp-puma.sock; } server { listen 80; server_name myapp.com; root /var/www/myapp/current/public; access_log /var/www/myapp/current/log/access.log; error_log /...
Read more