尝试从另一个Java程序调用时出现目录错误

Question

I'm trying to call a java program from another java program in a different directory. I get a "no such file or directory" error but I can copy and paste the directory I'm trying to reach from the error and it works fine.

 Exception in thread "main" java.io.IOException: Cannot run program "java -classpath /home/paleus/directories/trunk/web/postProc PostProcAuto": java.io.IOException: error=2, No such file or directory
    at java.lang.ProcessBuilder.start(ProcessBuilder.java:474)
    at java.lang.Runtime.exec(Runtime.java:610)
    at java.lang.Runtime.exec(Runtime.java:483)
    at PreParseAuto.parseEmail(PreParseAuto.java:352)
    at PreParseAuto.main(PreParseAuto.java:79)
Caused by: java.io.IOException: java.io.IOException: error=2, No such file or directory
    at java.lang.UNIXProcess.<init>(UNIXProcess.java:164)
    at java.lang.ProcessImpl.start(ProcessImpl.java:81)
    at java.lang.ProcessBuilder.start(ProcessBuilder.java:467)
    ... 4 more
[paleus@vm20031 preParsing]$ java -classpath /home/paleus/directories/trunk/web/postProc PostProcAuto
Please run as: inFile outFile procType[Inferencing=0|Phone=1|Email=2|Addr=3]
[paleus@vm20031 preParsing]$

Answer 1

Try giving the command a full path

So instead of

java --classpath ...

do

C:\Program Files\Java\jdk1.7\bin\java --classpath ...

Also, you might need to quote the arguments if they have spaces

Answer 2

Figured it out

Needed to be:

Process x = Runtime.getRuntime().exec(new String[]{"java","-classpath",postProcPath,"PostProcAuto",outFile.split("\\."), "2"});

Rather than:

Process x = Runtime.getRuntime().exec(new String[]{"java -classpath " + postProcPath +" PostProcAuto", outFile.split("\\."), "2"});