Debugging my code with Java's jdb. Am stuck at a point where my program expects command-line input, but jdb intercepts it as a jdb command.
How do I tell jdb to pass through text to the running program?
Version:
C:\Documents and Settings\*snip*>java -showversion
java version "1.6.0_17"
Java(TM) SE Runtime Environment (build 1.6.0_17-b04)
Java HotSpot(TM) Client VM (build 14.3-b01, mixed mode, sharing)
Compile:
javac -g LZWDecompress.java
jdb.ini:
stop in LZWDecompress.decompress
run
monitor list
This is what happens:
Initializing jdb ...
*** Reading commands from C:\Documents and Settings\*snip*\jdb.ini
Deferring breakpoint LZWDecompress.decompress.
It will be set after the class is loaded.
> run LZWDecompress
Set uncaught java.lang.Throwable
Set deferred uncaught java.lang.Throwable
> > >
VM Started: Set deferred breakpoint LZWDecompress.decompress
File to be decompressed:
At the prompt above, I enter "test", and receive this response:
...
VM Started: Set deferred breakpoint LZWDecompress.decompress
File to be decompressed: test
Unrecognized command: 'test'. Try help...
>
Here is the code from function main(...), written by our instructor, not me:
public static void main(String[] args) throws IOException {
short [] source;
int dlen;
int sz;
byte [] decompressed;
BufferedReader br;
DataInputStream In;
FileInputStream FI;
FileOutputStream FO;
InputStreamReader isr;
String cfnm;
String sfnm;
source = new short[INPUT_FILE_IO_BUFFER_SIZE];
decompressed = new byte[OUTPUT_FILE_IO_BUFFER_SIZE];
isr = new InputStreamReader(System.in);
br = new BufferedReader(isr);
System.out.print("File to be decompressed: ");
System.out.flush();
sfnm = br.readLine();
System.out.print("Name of the decompressed file: ");
System.out.flush();
cfnm = br.readLine();
FI = new FileInputStream(sfnm);
In = new DataInputStream(FI);
FO = new FileOutputStream(cfnm);
for (sz=0; true; ++sz) {
try { source[sz] = In.readShort();
} catch (EOFException e) { break;
} catch (Exception e) { System.out.print(e.toString());
}
}
dlen = decompress(source, sz, decompressed);
FO.write(decompressed, 0, dlen);
FO.close();
} // end main()