Exemplo

public class ClassA {

public void makeStream (OutputStream oStream) {

try {
OutputStreamWriter stream = new OutputStreamWriter(oStream);
stream.write(7);
//executar algo...

stream.close();

}
catch (IOException e) {
//fuga de fluxo...
}
}
}



Solução
Para evitar fugas de recursos, certifique-se de que close() seja chamado em cada java.io.OutputStreamWriter.
Nota: Essa regra se aplica a qualquer forma de construtor OutputStreamWriter.


public class ClassA {

public void makeStream (OutputStream oStream) {

OutputStreamWriter stream = null;
try {
stream = new OutputStreamWriter(oStream);
stream.write(7);
//executar algo...

}
catch (IOException e) {
//executar algo...

}
finally {
if (stream != null) {
try {
stream.close();

}
catch(IOException e) {
//executar algo...

}
}
}
}
}