Clever Geek Handbook

Java cannot get full error when running external command

I am trying to compile typescript files to java.

Here is the ".ts" file with errors:

alert("hello, typescript");
errrrrrrrrrrrrrrrrrrrrrrrrrror

When I compile in windows shell (cmd):

tsc hello.ts

It will report an error with the message:

E:/WORKSPACE/test/typescripts/hello.ts(2,0): The name 'errrrrrrrrrrrrrrrrrrrrrrrrror' 
does not exist in the current scope

But when I do this in java:

String cmd = "cmd /C tsc hello.ts";
Process p = Runtime.getRuntime().exec(cmd);
String out = IOUtils.toString(p.getInputStream());
String error = IOUtils.toString(p.getErrorStream());
System.out.println("### out: " + out);
System.out.println("### err: " + error);

It prints:

### out:
### err: E:/WORKSPACE/test/typescripts/hello.ts(2,0):

You can see that part errors are not captured. Where is wrong with my code?

Update

I just made sure that the tsc.exe

one provided by MS does not have such an issue and the one I run in this question is the tsc.cmd

one installed from npmnpm install typescript

+3


source to share


2 answers


Have you tried using the raw Process / ProcessBuilder combination?



ProcessBuilder pb = new ProcessBuilder("cmd /C tsc hello.ts");

//merge error output with the standard output
pb.redirectErrorStream(true);

Process p = pb.start();
try (BufferedReader reader = new BufferedReader(new InputStreamReader(p.getInputStream(), Charset.forName("UTF-8")))) {
    String line;
    while ((line = reader.readLine()) != null) {
        System.out.println(line);
    }
}
+2


source


I just spent a couple of hours chasing the same issue.



In the end I worked around it adding "2> errorfile.txt"

to my command line. This redirects stderr

to a file and then I read and print that file.

0


source






More articles:


All Articles