Exemplo

public class ClassA {

public void makeStream (OutputStream oStream) {

try {
ZipOutputStream stream = new ZipOutputStream(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.util.zip.ZipOutputStream.
Nota: Essa regra se aplica a qualquer forma de construtor ZipOutputStream.


public class ClassA {

public void makeStream (OutputStream oStream) {

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

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

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

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

}
}
}
}
}