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Index › Programming Questions & Help › Syntax Questions › Exception in thread "Animation Thread" - ......uh
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Exception in thread "Animation Thread" - ......uh (Read 1257 times)
Shakka
Exception in thread "Animation Thread" - ......uh
Mar 31st, 2010, 11:19am  
Hey. Another Processing Noob.

I have a confusing issue with my code. The error message that pops up (on occasion might I add) is:

Code:

Exception in thread "Animation Thread" java.lang.NullPointerException
	at DrawBoxNew$TweetBlock.<init>(DrawBoxNew.java:378)
	at DrawBoxNew.addTweetBlock(DrawBoxNew.java:64)
	at DrawBoxNew.draw(DrawBoxNew.java:194)
	at processing.core.PApplet.handleDraw(PApplet.java:1425)
	at processing.core.PApplet.run(PApplet.java:1327)
	at java.lang.Thread.run(Thread.java:637)


Processing highlights the problem being at line 95 of the following code:

Code:

 33   // constructor
 34   public TweetBlock(int yPosition, int boxX, int boxY, int boxLength, int boxWidth, boolean colour, Tweet tweet, User user, String nameTag)
 35   {
 36     active = false;
 37     // boxLength (horizontal)
 38     // boxWidth (vertical)
 39     
 40     x = 10+boxX; // 10 pixels to the right -- position of the block
 41     if (yPosition == 0)
 42       y = 10+boxY; // 10 pixels down -- position of the block
 43     else
 44       y = yPosition + boxY;
 45       
 46       
 47     labelX = 15+x; // a bit into the block
 48     
 49     labelY = 15+y; // "    "    "    "    "
 50     
 51     this.boxLength = boxLength;
 52     this.boxWidth = boxWidth;
 53     
 54     blockLength = boxLength-20;
 55     blockWidth = boxWidth/15;
 56     
 57     yboundary = boxY+boxWidth; // vertical
 58     shift = 40;
 59     
 60     blockDistance = yboundary-y;
 61     
 62     this.colour = colour;
 63     
 64     this.tweet = tweet;
 65     this.user = user;
 66     this.nameTag = nameTag;
 67     
 68     tweetText = new ArrayList(0);
 69     tweetText.add(tweet.getText());
 70     
 71     tempName = "";
 72     if (this.user == null)
 73       {tempName = "NoName";}
 74     else
 75       tempName = user.name();
 76     
 77     
 78     tempText = tweet.getText();
 79     if (tempText.length() > 80)
 80     {
 81       labelY = labelY-30;
 82       StringBuffer sb = new StringBuffer("");
 83       for (int i = 0; i<tempText.length(); i++)
 84       {
 85         if (i < 80)
 86           sb.append(tempText.charAt(i));
 87         if (i==80)
 88           sb.append("\n");
 89         if (i>80)
 90           sb.append(tempText.charAt(i));
 91       }
 92       tempText = sb.toString();
 93     }
 94     
 95     label = "User " + user.name() + " posted: " + tempText;
 96   }



Any ideas?  Cry

Shakka
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antiplastik
Re: Exception in thread "Animation Thread" - ......uh
Reply #1 - Mar 31st, 2010, 11:41am  
user might be null. just check as you do at line 72.
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WWW  
stopfocus
Re: Exception in thread "Animation Thread" - ......uh
Reply #2 - Apr 1st, 2010, 1:21pm  
Java dosn't use the same convention to compare strings as it does Numbers....  do a search on compareTo on http://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.html

I believe you get that error because its passing the null value.
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