java - Executing 'adb logcat' command using Runtime class -

i trying logcat content jtextpane. used following code hoping return content string freeze , also, doesn't produce error.

process exec = null;     try {         exec = runtime.getruntime().exec("adb logcat -d");         inputstream errorstream = exec.geterrorstream();         bufferedreader ebr = new bufferedreader(new inputstreamreader(errorstream));         string errorline;         while ((errorline = ebr.readline()) != null) {             system.out.println("[error] :- " + errorline);         }          if (exec.waitfor() == 0) {             inputstream infostream = exec.getinputstream();             inputstreamreader isr = new inputstreamreader(infostream);             bufferedreader ibr = new bufferedreader(isr);             string infoline;             while ((infoline = ibr.readline()) != null) {                 system.out.println("[info] :- " + infoline);             }         }     } catch (ioexception | interruptedexception ex) {         ex.printstacktrace();     } {         if (exec != null) {             exec.destroy();         }     } 

i referred tutorials but, not filling problem. wrong? there other methods logcat content string programmatically? sorry if dumb question.

the issue you're seeing you're trying process command streams , wait executing process, in same thread. it's blocking because process reading streams waiting on process , you're losing stream input.

what you'll want implement function reads/processes command output (input stream) in thread , kick off thread when start process.

second, you'll want use processbuilder rather runtime.exec.

something can adapted want:

public class test {     public static void main(string[] args) throws exception {                     string startdir = system.getproperty("user.dir"); // start in current dir (change if needed)         processbuilder pb = new processbuilder("adb","logcat","-d");         pb.directory(new file(startdir));  // start directory         pb.redirecterrorstream(true); // redirect error stream stdout         process p = pb.start(); // start process         // start new thread handle stream input         new thread(new processtestrunnable(p)).start();         p.waitfor();  // wait if needed     }      // mimics stream gobbler, allows user process result     static class processtestrunnable implements runnable {         process p;         bufferedreader br;          processtestrunnable(process p) {             this.p = p;         }          public void run() {             try {                 inputstreamreader isr = new inputstreamreader(p.getinputstream());                  br = new bufferedreader(isr);                  string line = null;                 while ((line = br.readline()) != null)                 {                     // output here...                                         }             }             catch (ioexception ex) {                 ex.printstacktrace();             }         }     } }