CODEWITHSUNDEEP
java
Sridhar Sarnobat
Sridhar Sarnobat

Reputation: 25226

ProcessBuilder - No such file or directory (but Runtime.exec() works)

Why am I experiencing different behavior in these 2 cases? Have I missed something out?

Command:

new ProcessBuilder().directory(
                    Paths.get(System.getProperty("user.dir")).toFile())
                    .command("/usr/bin/java -Djava.library.path=/Users/myusername/myproject/lib/DynamoDBLocal_lib/ -jar /Users/myusername/myproject/lib/DynamoDBLocal.jar  -sharedDb").start();

Stack Trace:

Exception in thread "main" java.lang.RuntimeException: java.io.IOException: Cannot run program "/usr/bin/java -Djava.library.path=/Users/myusername/myproject/lib/DynamoDBLocal_lib/ -jar /Users/myusername/myproject/lib/DynamoDBLocal.jar  -sharedDb" (in directory "/Users/myusername/myproject"): error=2, No such file or directory
    at com.comcast.tvx.app.xreserver.Main.exec(Main.java:47)
    at com.comcast.tvx.app.xreserver.Main.main(Main.java:16)
Caused by: java.io.IOException: Cannot run program "/usr/bin/java -Djava.library.path=/Users/myusername/myproject/lib/DynamoDBLocal_lib/ -jar /Users/myusername/myproject/lib/DynamoDBLocal.jar  -sharedDb" (in directory "/Users/myusername/myproject"): error=2, No such file or directory
    at java.lang.ProcessBuilder.start(ProcessBuilder.java:1048)
    at com.comcast.tvx.app.xreserver.Main.exec(Main.java:44)
    ... 1 more
Caused by: java.io.IOException: error=2, No such file or directory
    at java.lang.UNIXProcess.forkAndExec(Native Method)
    at java.lang.UNIXProcess.<init>(UNIXProcess.java:248)
    at java.lang.ProcessImpl.start(ProcessImpl.java:134)
    at java.lang.ProcessBuilder.start(ProcessBuilder.java:1029)
    ... 2 more

Environment in failing case:

{PATH=/usr/bin:/bin:/usr/sbin:/sbin
JAVA_STARTED_ON_FIRST_THREAD_1074=1
SHELL=/bin/zsh
SECURITYSESSIONID=186a4
USER=myusername
JAVA_MAIN_CLASS_25188=com.comcast.tvx.app.xreserver.Main
APP_ICON_1074=../Resources/Eclipse.icns
COMMAND_MODE=unix2003
TMPDIR=/var/folders/t_/dlj2wfdj0bx2xl6mnnqmxyhj99pf4b/T/
SSH_AUTH_SOCK=/tmp/launch-Bhd1It/Listeners
DISPLAY=/tmp/launch-PuSx66/org.macosforge.xquartz:0
__CF_USER_TEXT_ENCODING=0x529B388B:0:0
Apple_PubSub_Socket_Render=/tmp/launch-hB7zpQ/Render
__CHECKFIX1436934=1
LOGNAME=myusername
HOME=/Users/myusername}

More information

When I do it with Runtime.exec() the environment looks identical but I don't get the error:

Command:

Runtime.getRuntime().exec("/usr/bin/java -Djava.library.path=/Users/myusername/myproject/lib/DynamoDBLocal_lib/ -jar /Users/myusername/myproject/lib/DynamoDBLocal.jar  -sharedDb")

Environment in succeeding case:

{PATH=/usr/bin:/bin:/usr/sbin:/sbin
JAVA_STARTED_ON_FIRST_THREAD_1074=1
SHELL=/bin/zsh
JAVA_MAIN_CLASS_25360=com.comcast.tvx.app.xreserver.Main
SECURITYSESSIONID=186a4
USER=myusername
APP_ICON_1074=../Resources/Eclipse.icns
COMMAND_MODE=unix2003
TMPDIR=/var/folders/t_/dlj2wfdj0bx2xl6mnnqmxyhj99pf4b/T/
SSH_AUTH_SOCK=/tmp/launch-Bhd1It/Listeners
DISPLAY=/tmp/launch-PuSx66/org.macosforge.xquartz:0
__CF_USER_TEXT_ENCODING=0x529B388B:0:0
Apple_PubSub_Socket_Render=/tmp/launch-hB7zpQ/Render
__CHECKFIX1436934=1
LOGNAME=myusername
HOME=/Users/myusername}

Upvotes: 2

Views: 10022

Answers (1)

Nir Alfasi
Nir Alfasi

Reputation: 53525

Try to change this line:

.command("/usr/bin/java -Djava.library.path=/Users/myusername/myproject/lib/DynamoDBLocal_lib/ -jar /Users/myusername/myproject/lib/DynamoDBLocal.jar  -sharedDb").start();

to (scroll all the way to the right to see the difference):

.command("/usr/bin/java -Djava.library.path=/Users/myusername/myproject/lib/DynamoDBLocal_lib/ -jar /Users/myusername/myproject/lib/DynamoDBLocal.jar  -sharedDb".split("\\s+")).start();

Explanation: the input to command() should be an array (or list) of strings each of which is another argument (or "token"). It should not contain whitespaces!

From the docs:

a command, a list of strings which signifies the external program file to be invoked and its arguments, if any. Which string lists represent a valid operating system command is system-dependent. For example, it is common for each conceptual argument to be an element in this list, but there are operating systems where programs are expected to tokenize command line strings themselves - on such a system a Java implementation might require commands to contain exactly two elements.

Upvotes: 9

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