How to fix NullPointerException

juicemandrew

float easing = 0.05;
float offset = 0;
void setup() {
size(720, 480);
bot1 = loadShape("robot1.svg");
bot2 = loadShape("robot2.svg");
bot3 = loadShape("robot3.svg");
landscape = loadImage("alpine.png");
 smooth();
//****CLASS**** Add the media files according the books instruction to make this application work.
//****CLASS**** Change Landscape Image to anyting of your choice, but it should be of the same type (.png) and roughly the same size.
//****CLASS**** When you get it working, snip a screen shot of it running and send the screen shot to the instructor. Don't send the .pde file.

landscape = loadImage("alpine.png");
smooth();
}
void draw() {
// Set the background to the "landscape" image; this image
// must be the same width and height as the program
background(landscape);
// Set the left/right offset and apply easing to make
// the transition smooth
float targetOffset = map(mouseY, 0, height, -40, 40);
offset += (targetOffset - offset) * easing;
// Draw the left robot
shape(bot1, 85 + offset, 65);
// Draw the right robot smaller and give it a smaller offset
float smallerOffset = offset * 0.7;
shape(bot2, 510 + smallerOffset, 140, 78, 248);
// Draw the smallest robot, give it a smaller offset
smallerOffset *= -0.5;
shape(bot3, 410 + smallerOffset, 225, 39, 124);
}

TfGuy44

1) Edit post. 2) Select code. 3) Press Ctrl + o.

koogs

4) post the complete exception, with line number

juicemandrew

robot1.svg does not exist or could not be read java.lang.NullPointerException at processing.data.XML$1.read(XML.java:190) at com.sun.org.apache.xerces.internal.impl.XMLEntityScanner.load(Unknown Source) at com.sun.org.apache.xerces.internal.impl.XMLEntityScanner.arrangeCapacity(Unknown Source) at com.sun.org.apache.xerces.internal.impl.XMLEntityScanner.skipString(Unknown Source) at com.sun.org.apache.xerces.internal.impl.XMLVersionDetector.determineDocVersion(Unknown Source) at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source) at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source) at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(Unknown Source) at com.sun.org.apache.xerces.internal.parsers.DOMParser.parse(Unknown Source) at com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderImpl.parse(Unknown Source) at processing.data.XML.(XML.java:187) at processing.core.PApplet.loadXML(PApplet.java:6322) at processing.core.PApplet.loadXML(PApplet.java:6312) at processing.core.PGraphicsJava2D.loadShape(PGraphicsJava2D.java:1537) at processing.core.PGraphicsJava2D.loadShape(PGraphicsJava2D.java:1526) at processing.core.PApplet.loadShape(PApplet.java:11651) at Robot_4_HW_Week_12.setup(Robot_4_HW_Week_12.java:27) at processing.core.PApplet.handleDraw(PApplet.java:2361) at processing.core.PGraphicsJava2D.requestDraw(PGraphicsJava2D.java:240) at processing.core.PApplet.run(PApplet.java:2256) at java.lang.Thread.run(Unknown Source)

juicemandrew

sorry about that.

bilmor

It's saying it can't find robot1.svg. Have you followed the class instructions and put the media files where the book says to?

juicemandrew

yes i did bilmor

koogs

That code looks wrong. The variables you use on lines 5-8 aren't defined anywhere. And lines 14 and 15 are repeats.

Pictures should go in a folder called 'data' under the sketch folder and the filenames must match exactly - case is important

koogs

(Also, pressing ctrl-t in the processing editor will indent the code nicely)