PImage webImg;
String urls[];

void setup() {
  size(200,200);
  
  urls = new String[2];
  // working URL
  urls[0] = "https://"+"processing.org/img/processing-web.png";
  // bad URL
  urls[1] = "https://"+"**********.org/img/processing-web.png";
}

void draw() {
  
  background(0);
    try {
      webImg = loadImage(urls[frameCount%2], "png");
    } catch (Exception e) {
    //e.printStackTrace();
    webImg = null;
    println("Error!");
  }
  
  if (webImg != null) {
    println("It Worked!");
   image(webImg,0,0); 
  }

}

Example :

void aMethod() {
 if(problem){print("Error");}
}

The method aMethod is used in a lots of different contexts in my sketch. How can I modify my error message so I get something like the stack trace of an error ?

I'm using the Bezier SQL library, and have trouble handling exceptions. In the below code, I'm trying to connect to a database using bad credentials, which throws the exception:

java.sql.SQLException: Access denied for user 'thisisnottherightuser'@'92.106.188.139' (using password: YES)

However, putting the database connection in a try/catch statement does not catch the exception, and if the catch is written as catch(SQLException e), I get a compile error saying "This exception is never thrown from the try statement body", even though it clearly does throw it.

Does anyone have a hint as to what I'm doing wrong?

Thanks!!

import de.bezier.data.sql.mapper.*;
import de.bezier.data.sql.*;

String dbHost    = "89.216.113.243:3306";
String dbUser    = "thisisnottherightuser";
String dbPass    = "thisisnottherightpassword";
String dbName    = "testname";

MySQL             mainSQL;

void setup() {
  mainSQL    = new MySQL(this, dbHost, dbName, dbUser, dbPass);
  try {
     mainSQL.connect(); 
  } catch (Exception e) {
    println("there was a problem"); 
  }
  exit();
}

//Variables for drawing bubbles
int bubbleDiameter = 25;
int bubbleOffset = bubbleDiameter/2 + 10;

//Colors set to names for readability
color blue = color(0, 204, 251);
color red = color(254, 42, 2);
color green = color(47, 252, 25);
color yellow = color(254, 236, 76);
color pink = color(250, 1, 138);

//Arrays conataining properties of each bubble
int bubbleColor[][] = new int[20][25]; //Contains an int corresponding to the bubble's color
boolean bubbleHover[][] = new boolean[20][25]; //When mouse is hovering above bubble this is true
Bubble bubble[][] = new Bubble[20][25];

void setup() {

  size(520, 700); //Create window
  colorGen();
  for(int x = 0; x < 20; x++) {
    for(int y = 0; y < 25; y++) {
      bubble[x][y] = new Bubble(x, y);

    }
  }

}

void draw() {
  background(192, 192, 255);

  scoreBar();

  for(int x = 0; x < 20; x++) {
    for(int y = 0; y < 25; y++) {  
      bubble[x][y].drawBubble();
    }
  }
  checkHover();

}

class Bubble {

  boolean living;
  int xPos;
  int yPos;
  int col;

  //Bubble class

  //Constructor for bubble
  public Bubble(int x, int y) {

    this.living = true; //State of bubble
    this.xPos = x; //Gives the x position of the bubble in the array
    this.yPos= y; //Gives the y position of the bubble in the array
    this.col = bubbleColor[x][y]; //Sets color value to that in the array generated by colorGen()
  }

  //
  void killBubble() {
    this.living = false;
    this.col = 5;
  }

  void check(boolean b) {
   this.check();
   this.killBubble(); 
  }

  void check() {
    boolean n = false;
    try {
      print("0\n");
      if (bubble[this.xPos+1][this.yPos].living) {
        if(this.col == bubble[this.xPos+1][this.yPos].col) {
          this.killBubble();
          bubble[this.xPos+1][this.yPos].check(true);
        }
      }
      print("1\n");
      if (bubble[this.xPos-1][this.yPos].living) {
        if(this.col == bubble[this.xPos-1][this.yPos].col) {
          this.killBubble();
          bubble[this.xPos-1][this.yPos].check(true);
        }
      }
      print("2\n");
      if (bubble[this.xPos][this.yPos+1].living) {
        if(this.col == bubble[this.xPos][this.yPos+1].col) {
          this.killBubble();
          bubble[this.xPos][this.yPos+1].check(true);
        }
      }
      print("3\n");
      if (bubble[this.xPos][this.yPos-1].living) {
        if(this.col == bubble[this.xPos][this.yPos-1].col) {
          this.killBubble();
          bubble[this.xPos][this.yPos-1].check(true);
        }
      }  

    }
    catch(Exception border) {
      print(border.toString());
    }
  }  

  void drawBubble() {
    if(this.living) {
      //Colors bubble based on color value from array
      if(this.col == 0) {
        fill(red);  
      }
      else if(this.col == 1) {
        fill(blue); 
      }
      else if(this.col == 2) {
        fill(green);  
      }
      else if(this.col == 3) {
        fill(yellow);  
      }
      else if(this.col == 4) {
        fill(pink); 
      }
      //Draws bubble in grid
      ellipse(bubbleOffset + xPos*bubbleDiameter, bubbleOffset + yPos*bubbleDiameter, bubbleDiameter, bubbleDiameter);
    }
  }
}

//Runs when mouse is clicked
void mouseClicked() {
  for(int x = 0; x < 20; x++) {
    for(int y = 0; y < 25; y++) { 
      if(bubbleHover[x][y] == true) { //Checks which bubble the mouse is over when clicked
        try {
          bubble[x][y].check();
        }
        catch(Exception e) {}
      }
    }
  }  
}

//Checks if mouseX and mouseY fall within a certain bubble's area
void checkHover() {
  for(int x = 0; x < 20; x++) {
    for(int y = 0; y < 25; y++) { 
      if(mouseX > bubbleOffset + x*bubbleDiameter - bubbleDiameter/2 && mouseX < bubbleOffset + x*bubbleDiameter + bubbleDiameter/2 
        && mouseY > bubbleOffset + y*bubbleDiameter - bubbleDiameter/2 && mouseY < bubbleOffset + y*bubbleDiameter + bubbleDiameter/2) {

        bubbleHover[x][y] = true; //Sets hover to true if locations intersect
      }
      else {
        bubbleHover[x][y] = false; //Sets hover to false if there is no intersection
      }
    }
  }
}

//Generates random colors and assigns them to positions in an array
void colorGen() {
  for(int x = 0; x < 20; x++) {
    for(int y = 0; y < 25; y++) {
      bubbleColor[x][y] = floor(random(5));
    }
  }
}

//Creates score box
void scoreBar() {
  textSize(32);
  fill(pink);
  text("Score:", 10, 675); 
  text("Time:", width/2, 675);
}