Runtime.getRuntime().exec() don`t work when there is a space in File-Url?

Question

I´am facing a very strange Problem right now. It took me 2 hours to reproduce and get the "solution" of this error.

This happens:

I try to start another .jar file, located in System.getProperty("user.dir") .

actually, I use this for start:

Runtime.getRuntime().exec("java -jar "+System.getProperty("user.dir")+System.getProperty("file.separator")+"myJar.jar");

This works fine if the System.getProperty("user.dir") 's will look like this for example:

C:\MyProgramm\

But if the System.getProperty("user.dir") look like:

C:\My Programm\

it will not work. It´s strange, beacuase there is no exception thrown. Please, if you can, and if my Explanation is clear enough, can you give me a solution for this issue?

Sorry for my english, please do not hesitate to ask all questions if something is unlear.

Sanjeev · Accepted Answer · 2014-07-11 11:36:59Z

2

You shall put your commands in a String[] like this:

String[] command = new String[]{"java","-jar",System.getProperty("user.dir")+System.getProperty("file.separator")+"myJar.jar"};

and than use

Runtime.getRuntime().exec(command);

Hope this helps.

answered Jul 11, 2014 at 11:36

Sanjeev

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Comments

Peter Lawrey · Accepted Answer · 2014-07-11 12:22:50Z

2

if my Explanation is clear enough, can you give me a solution for this issue?

When you give a single string for it to run it expects to use space as a seperator e.g.

java -jar C:\My Program\myJar.jar

has four words

java
-jar
C:\My
Program\myJar.jar

The simple solution is to not get it to do the parsing.

Runtime.getRuntime().exec(new String[] {
    "java", "-jar", System.getProperty("user.dir")+System.getProperty("file.separator")+"myJar.jar" } );

Now it no longer sees space as a separator.

When you run a program, errors are sent to the error stream, and do not trigger an exception. I suggest you always read the error stream to see what errors you might be getting.

edited Jul 11, 2014 at 12:22

answered Jul 11, 2014 at 10:32

Peter Lawrey

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4 Comments

ÂlexBay Over a year ago

Compiler said "no suitable method found for exec(String,String,String)

Peter Lawrey Over a year ago

In that case try

Runtime.getRuntime().exec(new String[] { "java", "-jar", System.getProperty("user.dir")+System.getProperty("file.separator")+"myJar.jar" } );

Peter Lawrey Over a year ago

@ÂlexBay Which version of Java do you have?

ÂlexBay Over a year ago

I use JDK 1.7.0_55, I will give it a try! edit: Yes, this methods works also very good. Thank you very much! upvoted

BackSlash · Accepted Answer · 2014-07-11 10:30:50Z

1

You have to use quotes around a path if it contains spaces.

java -jar "C:\My path has spaces\my app.jar"

In your specific case:

Runtime.getRuntime().exec("java -jar \""+System.getProperty("user.dir")+System.getProperty("file.separator")+"myJar.jar\"");

Where \" is the escape character for ".

3 Comments

ÂlexBay Over a year ago

I do not hard-code the path, I did it this way: Runtime.getRuntime().exec("java -jar "+System.getProperty("user.dir")+System.getProperty("file.separator")+"myJar.jar");

BackSlash Over a year ago

@ÂlexBay Read the answer, I updated it in the exact moment you wrote your comment :)

ÂlexBay Over a year ago

:) seems to work like a charm, I will do some checks and mark this answer as right if I don´t face a Problem. Thank you in advance!

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