Java.lang.StackOverflowError reading to a variable

Question

Hello,
Below is the piece of the code used to replace all matched pattern to empty. But when executed
1. FileInputStream fis = new FileInputStream(filePath);
2. FileChannel fc = fis.getChannel();
3. MappedByteBuffer bb = fc.map(FileChannel.MapMode.READ_ONLY, 0,(int) fc.size());
4. Charset cs = Charset.forName("UTF-8");
5. CharsetDecoder cd = cs.newDecoder();
6. CharBuffer cb = cd.decode(bb);
7. Matcher m = p.matcher(cb);
8. str = m.replaceAll("");
at line 8, there is a java.lang.StackOverflowError. In some cases only this error arises.
I have looked into http://forums.sun.com/thread.jspa?threadID=5268472
but I could not understand solution for my problem.
Any help is highly appreciated.
Thanks,
Mallikarjun.

Answer 1

Hi,
I am trying to extract the un-commented part of the code available in the .js file through pattern matching regular expression. The sample code of the JavaScript is shown below. In many scenarios it is working fine, but for this file, it throws StackOverFlowError.
sample .js file:
* Loads an instance of a device service interface. This is a synchronous
* function.
* @alias nokia.device.load
* @param {string} interfaceName A fully qualified name of the interface name.
*                      E.g. A fully qualified name: nokia.device.contact
* @param {string} [version] A string representing the interface version number.
*                Matches if the supported version is equal to or larger than
*                the supplied version.e.g. 1.0
*                If not specified the framework will load the default version
* @example
* // Loading the service defined by the Contact API:
* try {
*   var so = nokia.device.load("contacts");
*   // use Contact API functions: so.addContact(), or so.getContact(), etc.
* } catch (e) {
*   // An error occurred. If e.name is "DeviceException", then the error orginates
*   // in load(), the properties e.message and e.code contain more information.
* @throws {DeviceException} May throw non-recoverable errors with error codes 1 through 3.
* @return {ServiceInterface} An object that implements ServiceInterface and in addition contains the
*                               functions defined in the API identified by +interfaceName+.
var so = abc.device.load("contacts");
var so = abc.device.load("contacts");
My Java code to get uncommented portion of file:
String str = null;
Pattern p = null;
String regex;
if ((filePath.toString().endsWith(".htm")) || (filePath.toString().endsWith(".html"))) {
p = Pattern.compile("\\<!--[ \\r\\n\\t]-->",Pattern.MULTILINE);
} else if (filePath.toString().endsWith(".js")) {
p =Pattern.compile("(?:/\(?:|(?:\/))\/)|(?://.)", Pattern.MULTILINE);
if (p != null) {
try {
FileInputStream fis = new FileInputStream(filePath);
FileChannel fc = fis.getChannel();
MappedByteBuffer bb = fc.map(FileChannel.MapMode.READ_ONLY, 0,(int) fc.size());
Charset cs = Charset.forName("UTF-8");
CharsetDecoder cd = cs.newDecoder();
CharBuffer cb = cd.decode(bb);
Matcher m = p.matcher(cb);
str = m.replaceAll(""); // at this point of time, I am getting the exception
} catch (IOException e) {
Activator.log(e);
return str;Edited by: malli2010 on Aug 10, 2010 11:53 PM