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I have a maven project, in which, I am trying to execute a script (written in R). I put this script file in the source code directory as well. I found this script is not executed at all. However, when I move this script outside the jar file, it does execute ! Can anyone tell me why, and give me some solutions to put the script inside the jar while ensure its execution?

Thanks a lot !

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3 Answers 3

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I would do the following:

  • Get InputStream for the file with ClassLoader.getResourceAsStream()
  • Write this InputStream to tmp dir
  • Execute it with Runtime.getRuntime().execute(..)
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7 Comments

@carlspring yes, i do agree, but it will be better to give a little bit code for step 2. I don't know how to create the temporary file, where the temporary locates, and delete it on exit ? Thanks ~
@EnsomHodder To create use something like this: File.createTempFile("prefix", "suffix")
@EnsomHodder To delete use File.deleteOnExit();
@KonstantinSolomatov so after creating the temp file, I create an outputstream to write the script file into this newly created tmp file, and then call it ?
@KonstantinSolomatov Excuse me, I am trying your method however i cannot manage to it. Firstly, i get the inputstream from the given file name "./src/main/resources/aaa.R" (script to execute) ; secondly, I create a temp file, and from which I create a FileOutputStream to write the script in. However it will throws a NullPointerException when my program tries to read bytes array from the inputstream obtained by getResourcesAsStream. Could you help me survive from it ? I am very grateful for your help !
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File inside jar is no longer a file, So to execute it you first need to extract it somewhere and then execute it from external extracted file path

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You mean extract the whole jar file or only the script file to be executed? And could you please tell me how to extract one single file from jar ?
Just extract the required file from jar, see the link for more details from answer
Thanks for your help. after the execution of the script, I have to remove the extracted files. Seems that it's not very clean ~ but most of all, it works
By the way. I don't know where the class ACWrapper comes from? Could you explain it ? thanks
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You will need to extract the script from the jar file:

jar -xvf my.jar com/foo/my.script.sh
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so you mean it's better to execute this command from the Java program, and then execute the second command (extracted file) ? it seems it's quite simple and doesn't not any external library support ~

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