ArrayIndexOutOfBoundsException Error - Tried debugging but still no solution

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villaje

ArrayIndexOutOfBoundsException Error - Tried debugging but still no solution

in Programming Questions • 2 years ago

Hi, I've read up on the coding and also searched specifically for this error message. I've tried to debug but can't find the issue. Does anyone know what could be wrong with coding? FYI: Ive changed out URLs I'm using to keep it general.

This program is very simple. Its parses the first page for the first HREF it finds and then follows that link, opens up new page, does the same search for HREF and continues. The issue I'm having is making sure the HREF URL is not within parentheses but outside of them. but the error message is coming from somewhere else.

String[] lines;
String pTag = "<p>";
String hrefTag = "<a href=\"";
int count=0;
int i = 0;
String found;
String rightHREF;
String line;
String[] m1;
String[] m2;
String[] checkPara;
String[] checkPara2;
String para = "\\(";
String para2 = "\\)";
String domain = "http://www.domain.com";
String newHREF = "http://www.domain.com/specific_page";
void setup() {
search4URL(); // start searching
}
void search4URL() { // search url
while(count<15) { // search this number of urls
lines = loadStrings(newHREF); // Load new URL
println(newHREF+", i = "+ i + ", found = " + found + ", Array Length = "+ lines.length); // Debug, print NEW URL
//println(lines);
while(found == null) { // do this until you find first URL in body
m1 = match(lines[i], pTag); // check each line for <p> tag
if (m1 != null) { // if found a line with <p> then check if it has a url
//println("----in first tag loop"); // DEBUG
line = lines[i]; // extract line to test further
m2 = match(line, hrefTag); // check if line has url
if (m2 != null) { // if found a url then test and do extraction
while(rightHREF == null) { // Do this until you have extracted correct HREF
int beginPos = line.indexOf(hrefTag); // Get position of first HREF location
String textBefore = line.substring(0,beginPos); // Extract text before HREF
String s = line.substring(beginPos+9);// Extract text after HREF text
checkPara = match(textBefore, para); // Check if text before HREF has a "("
checkPara2 = match(textBefore, para2); // Check if text before HREF has a ")"
println("i = "+i+" , checkPara = "+checkPara+" , checkPara2 = "+ checkPara2);
if (checkPara != null) { // if there is an opening parentheses before HREF then
if (checkPara2 != null) { // and if there is a closing parentheses before HREF then link found is valid
int endPos = s.indexOf("\""); // Get position of end of URL
String href = s.substring(0,endPos); // Extract URL from text
newHREF = (domain + href); // Update newHREF with new URL
found = "1"; // Exit while (found) loop
rightHREF = "1";
} else { // Else then link found is within parentheses.
line = (s);
}
} else {
int endPos = s.indexOf("\""); // Get position of end of URL
String href = s.substring(0,endPos); // Extract URL from text
newHREF = (domain + href); // Update newHREF with new URL
found = "1"; // Exit while (found) loop
rightHREF = "1";
}
//println(newHREF);
m1 = null; // Exit m1 loop
m2 = null; // Exit m2 loop
checkPara = null;
checkPara2 = null;
}
} // End of URL found & Extraction loop
} // End of TAG found & find URL loop
i++; // Lets go to next line in page
} // End of searching whole page
i = 0; // reset line counter
found = null; // reset FOUND indicator
count++; // lets go to next URL
}
}

ERROR MESSAGE (it stops on line 29 in red above:

http://www.domain.com/specific_page/), i = 0, found = null, Array Length = 100
i = 61 , checkPara = null , checkPara2 = null
http://www.domain.com/second_page, i = 0, found = null, Array Length = 110
processing.app.debug.RunnerException: ArrayIndexOutOfBoundsException: 1080
at processing.app.Sketch.placeException(Sketch.java:1543)
at processing.app.debug.Runner.findException(Runner.java:583)
at processing.app.debug.Runner.reportException(Runner.java:558)
at processing.app.debug.Runner.exception(Runner.java:498)
at processing.app.debug.EventThread.exceptionEvent(EventThread.java:367)
at processing.app.debug.EventThread.handleEvent(EventThread.java:255)
at processing.app.debug.EventThread.run(EventThread.java:89)
Exception in thread "Animation Thread" java.lang.ArrayIndexOutOfBoundsException: 1080
at wiki_philosophy.search4URL(wiki_philosophy.java:52)
at wiki_philosophy.setup(wiki_philosophy.java:43)
at processing.core.PApplet.handleDraw(PApplet.java:1583)
at processing.core.PApplet.run(PApplet.java:1503)
at java.lang.Thread.run(Thread.java:680)

Thanks in advance!

Replies(1)

amnon.owed

Re: ArrayIndexOutOfBoundsException Error - Tried debugging but still no solution

2 years ago

It doesn't stop at the last line, it just keeps going. So to prevent the error, you need to add something so the code only goes as long as the number of lines, that way you don't go "out of bounds". As a failsafe to do this you could change line 28 into this:

while (found == null && i < lines.length) { // do this until you find first URL in body && max lines

But more importantly the found doesn't seem to be working correctly, even in a page that has an url it just keeps going (at least the page that I tried). So that's probably another thing to look at.

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