Scratch

shadow_7283 · 2010-10-04 21:39:08

I've been trying to edit the .class files in the Scratch Applet for some time now. One particular one I wanted to edit was the PlayerCanvas.class file. It was in this that I saw the "Loading..." string, and I decided to try and edit it as a simple first project.

I first downloaded a java decompiler, which turned the .class file into a .java file no problem. Then I edited the string. Also no problems.

I had a lot of trouble with the compiling. First I downloaded JDK, and then it took me forever to find out how to access my files from the command prompt. When everything was set up, I tried compiling it.

I got 57 errors.

I'm curious as to why this happened, as I only edited the string a small amount. Is the PlayerCanvas.class file dependent on any other ones? Should this make a difference while I'm compiling it? I'm a loss for what to do next.

Here are the messages the appeared on the command prompt, for anyone who is interested.

Code:

PlayerCanvas.java:63: cannot find symbol
symbol  : class LContext
location: class PlayerCanvas
    void clearall(LContext lcontext)
                  ^
PlayerCanvas.java:194: cannot find symbol
symbol  : class Sprite
location: class PlayerCanvas
    BufferedImage drawAreaWithoutSprite(Rectangle rectangle, Sprite sprite)
                                                             ^
PlayerCanvas.java:268: cannot find symbol
symbol  : class Sprite
location: class PlayerCanvas
    void updatePenTrailForSprite(Sprite sprite)
                                 ^
PlayerCanvas.java:294: cannot find symbol
symbol  : class Sprite
location: class PlayerCanvas
    void stampCostume(Sprite sprite)
                      ^
PlayerCanvas.java:491: cannot find symbol
symbol  : class Drawable
location: class PlayerCanvas
    Drawable findDragTarget(int i, int j)
    ^
PlayerCanvas.java:517: cannot find symbol
symbol  : class Sprite
location: class PlayerCanvas
    void moveSpriteToFront(Sprite sprite)
                           ^
PlayerCanvas.java:665: cannot find symbol
symbol  : class LContext
location: class PlayerCanvas
    LContext lc;
    ^
PlayerCanvas.java:666: cannot find symbol
symbol  : class Sprite
location: class PlayerCanvas
    Sprite stage;
    ^
PlayerCanvas.java:676: cannot find symbol
symbol  : class Drawable
location: class PlayerCanvas
    Drawable mouseDragTarget;
    ^
PlayerCanvas.java:683: cannot find symbol
symbol  : class AskPrompter
location: class PlayerCanvas
    AskPrompter askPrompt;
    ^
PlayerCanvas.java:70: cannot find symbol
symbol  : variable SoundPlayer
location: class PlayerCanvas
        SoundPlayer.stopSoundsForApplet(lcontext);
        ^
PlayerCanvas.java:129: cannot find symbol
symbol  : class Drawable
location: class PlayerCanvas
                Drawable drawable = (Drawable)sprites[i];
                ^
PlayerCanvas.java:129: cannot find symbol
symbol  : class Drawable
location: class PlayerCanvas
                Drawable drawable = (Drawable)sprites[i];
                                     ^
PlayerCanvas.java:136: cannot find symbol
symbol  : class Drawable
location: class PlayerCanvas
                Drawable drawable1 = (Drawable)sprites[j];
                ^
PlayerCanvas.java:136: cannot find symbol
symbol  : class Drawable
location: class PlayerCanvas
                Drawable drawable1 = (Drawable)sprites[j];
                                      ^
PlayerCanvas.java:165: cannot find symbol
symbol  : variable Skin
location: class PlayerCanvas
        g.drawImage(overGoButton ? ((java.awt.Image) (Skin.goButtonOver)) : ((ja
va.awt.Image) (Skin.goButton)), 418, 4, null);
                                                      ^
PlayerCanvas.java:165: illegal start of type
        g.drawImage(overGoButton ? ((java.awt.Image) (Skin.goButtonOver)) : ((ja
va.awt.Image) (Skin.goButton)), 418, 4, null);
                                                     ^
PlayerCanvas.java:165: cannot find symbol
symbol  : variable Skin
location: class PlayerCanvas
        g.drawImage(overGoButton ? ((java.awt.Image) (Skin.goButtonOver)) : ((ja
va.awt.Image) (Skin.goButton)), 418, 4, null);

               ^
PlayerCanvas.java:165: illegal start of type
        g.drawImage(overGoButton ? ((java.awt.Image) (Skin.goButtonOver)) : ((ja
va.awt.Image) (Skin.goButton)), 418, 4, null);

              ^
PlayerCanvas.java:166: cannot find symbol
symbol  : variable Skin
location: class PlayerCanvas
        g.drawImage(overStopButton ? ((java.awt.Image) (Skin.stopButtonOver)) :
((java.awt.Image) (Skin.stopButton)), 451, 4, null);
                                                        ^
PlayerCanvas.java:166: illegal start of type
        g.drawImage(overStopButton ? ((java.awt.Image) (Skin.stopButtonOver)) :
((java.awt.Image) (Skin.stopButton)), 451, 4, null);
                                                       ^
PlayerCanvas.java:166: cannot find symbol
symbol  : variable Skin
location: class PlayerCanvas
        g.drawImage(overStopButton ? ((java.awt.Image) (Skin.stopButtonOver)) :
((java.awt.Image) (Skin.stopButton)), 451, 4, null);

                   ^
PlayerCanvas.java:166: illegal start of type
        g.drawImage(overStopButton ? ((java.awt.Image) (Skin.stopButtonOver)) :
((java.awt.Image) (Skin.stopButton)), 451, 4, null);

                  ^
PlayerCanvas.java:211: cannot find symbol
symbol  : class Drawable
location: class PlayerCanvas
            Drawable drawable = (Drawable)sprites[i];
            ^
PlayerCanvas.java:211: cannot find symbol
symbol  : class Drawable
location: class PlayerCanvas
            Drawable drawable = (Drawable)sprites[i];
                                 ^
PlayerCanvas.java:259: cannot find symbol
symbol  : class Sprite
location: class PlayerCanvas
            if(!(sprites[i] instanceof Sprite))
                                       ^
PlayerCanvas.java:261: cannot find symbol
symbol  : class Sprite
location: class PlayerCanvas
            Sprite sprite = (Sprite)sprites[i];
            ^
PlayerCanvas.java:261: cannot find symbol
symbol  : class Sprite
location: class PlayerCanvas
            Sprite sprite = (Sprite)sprites[i];
                             ^
PlayerCanvas.java:363: cannot find symbol
symbol  : variable LogoCommandRunner
location: class PlayerCanvas
            LogoCommandRunner.startLogoThread("greenflag", lc);
            ^
PlayerCanvas.java:369: cannot find symbol
symbol  : variable LogoCommandRunner
location: class PlayerCanvas
            LogoCommandRunner.startLogoThread("interact", lc);
            ^
PlayerCanvas.java:378: cannot find symbol
symbol  : class Sprite
location: class PlayerCanvas
        if(mouseDragTarget instanceof Sprite)
                                      ^
PlayerCanvas.java:380: cannot find symbol
symbol  : class Sprite
location: class PlayerCanvas
            Sprite sprite = (Sprite)mouseDragTarget;
            ^
PlayerCanvas.java:380: cannot find symbol
symbol  : class Sprite
location: class PlayerCanvas
            Sprite sprite = (Sprite)mouseDragTarget;
                             ^
PlayerCanvas.java:391: cannot find symbol
symbol  : class ListWatcher
location: class PlayerCanvas
        if(mouseDragTarget instanceof ListWatcher)
                                      ^
PlayerCanvas.java:393: cannot find symbol
symbol  : class ListWatcher
location: class PlayerCanvas
            ListWatcher listwatcher = (ListWatcher)mouseDragTarget;
            ^
PlayerCanvas.java:393: cannot find symbol
symbol  : class ListWatcher
location: class PlayerCanvas
            ListWatcher listwatcher = (ListWatcher)mouseDragTarget;
                                       ^
PlayerCanvas.java:432: cannot find symbol
symbol  : class Watcher
location: class PlayerCanvas
            if(mouseDragTarget instanceof Watcher)
                                          ^
PlayerCanvas.java:433: cannot find symbol
symbol  : class Watcher
location: class PlayerCanvas
                ((Watcher)mouseDragTarget).click(mouseevent.getX(), mouseevent.g
etY());
                  ^
PlayerCanvas.java:463: package Skin does not exist
            return i >= 418 && i <= 418 + Skin.goButton.getWidth(null);
                                              ^
PlayerCanvas.java:463: operator + cannot be applied to int,Skin.goButton.getWidt
h
            return i >= 418 && i <= 418 + Skin.goButton.getWidth(null);
                                    ^
PlayerCanvas.java:463: operator <= cannot be applied to int,<nulltype>
            return i >= 418 && i <= 418 + Skin.goButton.getWidth(null);
                                        ^
PlayerCanvas.java:475: package Skin does not exist
            return i >= 451 && i <= 451 + Skin.stopButton.getWidth(null);
                                              ^
PlayerCanvas.java:475: operator + cannot be applied to int,Skin.stopButton.getWi
dth
            return i >= 451 && i <= 451 + Skin.stopButton.getWidth(null);
                                    ^
PlayerCanvas.java:475: operator <= cannot be applied to int,<nulltype>
            return i >= 451 && i <= 451 + Skin.stopButton.getWidth(null);
                                        ^
PlayerCanvas.java:481: cannot find symbol
symbol  : variable SoundPlayer
location: class PlayerCanvas
        SoundPlayer.stopSoundsForApplet(lc);
        ^
PlayerCanvas.java:482: cannot find symbol
symbol  : variable LogoCommandRunner
location: class PlayerCanvas
        LogoCommandRunner.stopLogoThread(lc);
        ^
PlayerCanvas.java:483: cannot find symbol
symbol  : class LogoCommandRunner
location: class PlayerCanvas
        (new LogoCommandRunner("stopAll", lc, true)).run();
             ^
PlayerCanvas.java:495: cannot find symbol
symbol  : class Watcher
location: class PlayerCanvas
            if(sprites[k] instanceof Watcher)
                                     ^
PlayerCanvas.java:497: cannot find symbol
symbol  : class Watcher
location: class PlayerCanvas
                Watcher watcher = (Watcher)sprites[k];
                ^
PlayerCanvas.java:497: cannot find symbol
symbol  : class Watcher
location: class PlayerCanvas
                Watcher watcher = (Watcher)sprites[k];
                                   ^
PlayerCanvas.java:501: cannot find symbol
symbol  : class ListWatcher
location: class PlayerCanvas
            if(sprites[k] instanceof ListWatcher)
                                     ^
PlayerCanvas.java:503: cannot find symbol
symbol  : class ListWatcher
location: class PlayerCanvas
                ListWatcher listwatcher = (ListWatcher)sprites[k];
                ^
PlayerCanvas.java:503: cannot find symbol
symbol  : class ListWatcher
location: class PlayerCanvas
                ListWatcher listwatcher = (ListWatcher)sprites[k];
                                           ^
PlayerCanvas.java:507: cannot find symbol
symbol  : class Sprite
location: class PlayerCanvas
            if(!(sprites[k] instanceof Sprite))
                                       ^
PlayerCanvas.java:509: cannot find symbol
symbol  : class Sprite
location: class PlayerCanvas
            Sprite sprite = (Sprite)sprites[k];
            ^
PlayerCanvas.java:509: cannot find symbol
symbol  : class Sprite
location: class PlayerCanvas
            Sprite sprite = (Sprite)sprites[k];
                             ^
PlayerCanvas.java:630: cannot find symbol
symbol  : class AskPrompter
location: class PlayerCanvas
        askPrompt = new AskPrompter(s);
                        ^
Note: PlayerCanvas.java uses unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
57 errors

Any help is greatly appreciated.

cds56 · 2010-10-04 21:58:50

To know the error, one must first know what command you used to compile it.

The exact string please, but it sounds like you've miscompiled it, or done something simple. I haven't done java in a while, but I remember the wonky compiler. I should be able to help.

shadow_7283 · 2010-10-04 23:09:19

I just used the regular javac.exe file that comes in Java JDK to compile it. First, I used this code to set javac as a recognized command:

Code:

set PATH=%PATH%;"C:\Program Files\Java\jdk1.6.0_21\bin\"

Then I entered my path.

Code:

cd C:\Users\(My user)\Documents\Java\

Then I entered

Code:

javac PlayerCanvas.java

It then began compiling like it should, but when it was finished, I got a message saying I had 57 errors.

I think I've done everything right.

Last edited by shadow_7283 (2010-10-04 23:09:45)

MathWizz · 2010-10-05 09:08:22

I get this too. hmm I don't know how the Scratch team did it but I can only compile a few files. Delete all the Java files except for PlayerCanvas.java then compile with -Xlint (javac -Xlint PlayerCanvas.java.)

EDIT: You can compile by making a bat file too. Make a bat file called "Compile.bat" and it's contents should be "javac -Xlint PlayerCanvas.java". big_smile

Last edited by MathWizz (2010-10-05 09:12:55)

shadow_7283 · 2010-11-14 10:33:21

I finally got around to doing it. tongue I still get 57 errors, and I followed your example exactly.

shadow_7283 · 2010-11-14 12:03:08

*bump*

MathWizz · 2010-11-14 14:10:31

shadow_7283 wrote:
I finally got around to doing it. I still get 57 errors, and I followed your example exactly.

Did you delete all the extra files?

shadow_7283 · 2010-11-14 15:40:13

Delete extra files? I didn't want to delete them, but I put them in a separate folder. Do I actually have to delete them?

MathWizz · 2010-11-14 16:05:41

shadow_7283 wrote:
Delete extra files? I didn't want to delete them, but I put them in a separate folder. Do I actually have to delete them?

No, moving them is fine. The compiler wants to compile those too and they are the ones that cause the error.

shadow_7283 · 2010-11-14 18:22:43

Well, I'm still getting the 57 errors... hmm

Last edited by shadow_7283 (2010-11-14 18:22:55)

MathWizz · 2010-12-24 23:40:03

Oh, DUH! You need to have the rest of the compiled classes in the folder with the Java file you are trying to compile. smile I should have looked at the errors before!

shadow_7283 · 2010-12-25 12:29:30

0_0. THAT'S EXACTLY WHAT YOU TOLD ME NOT TO DO! tongue

MathWizz · 2010-12-25 14:27:55

I said the JAVA files. Not CLASS files. tongue

shadow_7283 · 2010-12-25 20:33:14

*facepalm*

fg123 · 2010-12-25 21:34:56

Lool. Anyways... It's fixed now?

Scratch

archived forums

#1 2010-10-04 21:39:08

Java Compiler Error?

Code:

#2 2010-10-04 21:58:50

Re: Java Compiler Error?

#3 2010-10-04 23:09:19

Re: Java Compiler Error?

Code:

Code:

Code:

#4 2010-10-05 09:08:22

Re: Java Compiler Error?

#5 2010-11-14 10:33:21

Re: Java Compiler Error?

#6 2010-11-14 12:03:08

Re: Java Compiler Error?

#7 2010-11-14 14:10:31

Re: Java Compiler Error?

shadow_7283 wrote:

#8 2010-11-14 15:40:13

Re: Java Compiler Error?

#9 2010-11-14 16:05:41

Re: Java Compiler Error?

shadow_7283 wrote:

#10 2010-11-14 18:22:43

Re: Java Compiler Error?

#11 2010-12-24 23:40:03

Re: Java Compiler Error?

#12 2010-12-25 12:29:30

Re: Java Compiler Error?

#13 2010-12-25 14:27:55

Re: Java Compiler Error?

#14 2010-12-25 20:33:14

Re: Java Compiler Error?

#15 2010-12-25 21:34:56

Re: Java Compiler Error?

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