无法运行程序“wkhtmltopdf”：错误=2，没有这样的文件或目录 - 从 Java 获取此错误

Question

I am executing wkhtmltopdf command line tool from Java but it is throwing below error.

Cannot run program "wkhtmltopdf": error=2, No such file or directory

But note that when I execute this command line tool from my mac terminal then pdf got generated successfully. Please see below.

MacBook-Air-2:~ inDiscover$ wkhtmltopdf /var/folders/7y/2vr28n113p908ksnk0fnpqch0000gn/T/test7896850081571855407.html /Users/mymac/Documents/Project/emailbody/test2.pdf
Loading pages (1/6)
Counting pages (2/6)                                               
Resolving links (4/6)                                                       
Loading headers and footers (5/6)                                           
Printing pages (6/6)
Done

I have seen lot many similar questions here (for ex: wkhtmltopdf: No such file or directory [ Closed ] ) but issue with those questions are related to $PATH . In my case I believe that I have set the path to the executable to $PATH correctly. Please see below.

MacBook-Air-2:~ inDiscover$ locate wkhtmltopdf
/private/var/db/receipts/org.wkhtmltopdf.wkhtmltox.bom
/private/var/db/receipts/org.wkhtmltopdf.wkhtmltox.plist
/usr/local/bin/wkhtmltopdf
/usr/local/share/man/man1/wkhtmltopdf.1.gz

You can see here wkhtmltopdf has been added to $PATH (/usr/local/bin)

Also, see below the response for echo $PATH .

MacBook-Air-2:~ inDiscover$ echo $PATH
/Users/mymac/anaconda/bin:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin
MacBook-Air-2:~ inDiscover$ 

I am getting this issue only when I try to execute the command from Java. Please see my java code below.

String VIEWPORT_SIZE = "2480x3508";
        int CONVERSION_DPI = 300;
        int IMAGE_QUALITY = 100;
        
        List<String> cmd = new ArrayList<String>(Arrays.asList("wkhtmltopdf",
                "--viewport-size", VIEWPORT_SIZE,
                "--enable-local-file-access",
                // "--disable-smart-shrinking",
                "--dpi", String.valueOf(CONVERSION_DPI),
                "--image-quality", String.valueOf(IMAGE_QUALITY)));
        //cmd.addAll(extParams);
        cmd.add("/var/folders/7y/2vr28n113p908ksnk0fnpqch0000gn/T/test7896850081571855407.html");
        cmd.add("/Users/mymac/Documents/Project/emailbody/test3.pdf");
        
        
        try {
            ProcessBuilder pb = new ProcessBuilder(cmd);

            if (Logger.level.compareTo(LogLevel.Info) >= 0) {
                pb.inheritIO();
            }

            Process p = pb.start();
            p.waitFor();
        } catch (Exception e) {
            e.printStackTrace();
        }

Am I really missing something?

Answer 1

Here are a few things you can check, one will hopefully resolve your issue.

Nearly all occasions I've seen where java is not finding an application that your shell or terminal does run are down to use of commands built into the shell / terminal (such as an alias), or because of PATH used in a script that you use to launch your java yourapp.ClassName... is different to that set for the interactive shell / terminal.

The interactive shell / terminal may include or source from other scripts on startup - for example it may have run code in ~/.bashrc , ~/.login , ~/.profile , ... meaning that PATH declared inside interactive shell is not same as PATH presented to Java app when you launched it.

Hence you see terminal show PATH has /usr/local/bin:

MacBook-Air-2:~ inDiscover$ echo $PATH
/Users/mymac/anaconda/bin:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin

But Java says no /usr/local/bin in PATH:

System.out.println("PATH="+System.getenv("PATH"));
/usr/bin:/usr/sbin:/sbin

So to fix your problem you could make java use absolute path to run the app wkhtmltopdf:

Arrays.asList("wkhtmltopdf" ->  Arrays.asList("/usr/local/bin/wkhtmltopdf" ...

OR you could make java launch your shell / terminal so the terminal sources its env scripts as normal and runs the command:

# Confirm which shell your Terminal uses:
echo $SHELL

If you have say SHELL=/bin/bash you can run /bin/bash from java and let it work out where wkhtmltopdf is:

Arrays.asList("wkhtmltopdf" ->  Arrays.asList("/bin/bash", "-c", "wkhtmltopdf" ...

OR if you have a script say runMyApp.sh to launch your java app, set the PATH before java yourclass.Name ,

export PATH=/usr/local/bin:$PATH
java yourclass.Name

OR if you have a script say runMyApp.sh to launch your java app, make that it sources the same profile environment as your Terminal does. This depends on the SHELL but for some systems could be something like:

#!/bin/bash

# Load env from current user - "source" and "." may or may not work in the SHELL you are using:
source ~/.bashrc
# OR maybe other shell
. ~/.somefilerc

echo $PATH # Now hopefully includes same /usr/local/bin
java yourclass.Name

Answer 2

Try to add sudo in the front of wkhtmltopdf.