putting java class online

**hwoarang69** · December 12th, 2012, 11:16 AM

i created a game in applet and i want to put it on a site. the problem is that my games has alot of classes. how can i use applet tag to up it online?

java.php

<html>
...
<applet code = "Main.class" width = 900 height = 400> </applet>	
...
</html>

my folder tree

-java_game
     -java.php
     -main.class
     -item.class 
     -background.clas
     -enemy.class
      -...
     -music
            -...
     -image
             -...

**Norm** · December 12th, 2012, 11:33 AM

my games has alot of classes

Put the classes into a jar file and add an archive= attribute to the <applet tag in the html

**hwoarang69** · December 15th, 2012, 11:17 PM

i just have about 10 files inside my java project. not dont have package. do i have to make a package to create all thoses jar files??

**Norm** · December 16th, 2012, 07:45 AM

do i have to make a package to create all thoses jar files??

No, you don't need to put the classes in packages.

**hwoarang69** · March 20th, 2013, 02:00 PM

i am confuse

Put the classes into a jar file and add an archive= attribute to the <applet tag in the html

i though i cant make applet into jar files?

**Norm** · March 20th, 2013, 02:05 PM

You can put any files into a jar file.

What is done with that jar file depends on what program is reading it.

**hwoarang69** · March 20th, 2013, 02:11 PM

....so let me try again
here is my folder. it has all my java class and images and sounds.
asdf.jpg

in my java_game_2.php
i am using this tag. now if it was only one file than it works fine with this tag.
<applet code = "Main.class" width = 900 height = 400> </applet>

porblem is that i have more than one files. and when i run in web, it give me error i looked online but i could only file this example. can u plz help me to fix this problem?

error on web:

Java Plug-in 1.6.0_29
Using JRE version 1.6.0_29-b11 Java HotSpot(TM) Client VM
User home directory = C:\Users\dave
----------------------------------------------------
c: clear console window
f: finalize objects on finalization queue
g: garbage collect
h: display this help message
l: dump classloader list
m: print memory usage
o: trigger logging
q: hide console
r: reload policy configuration
s: dump system and deployment properties
t: dump thread list
v: dump thread stack
x: clear classloader cache
0-5: set trace level to <n>
----------------------------------------------------

java.lang.UnsupportedClassVersionError: Main : Unsupported major.minor version 51.0
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClassCond(Unknown Source)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknow n Source)
at sun.plugin2.applet.Applet2ClassLoader.findClass(Un known Source)
at sun.plugin2.applet.Plugin2ClassLoader.loadClass0(U nknown Source)
at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Un known Source)
at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Un known Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.plugin2.applet.Plugin2ClassLoader.loadCode(Unk nown Source)
at sun.plugin2.applet.Plugin2Manager.createApplet(Unk nown Source)
at sun.plugin2.applet.Plugin2Manager$AppletExecutionR unnable.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Exception: java.lang.UnsupportedClassVersionError: Main : Unsupported major.minor version 51.0

**Norm** · March 20th, 2013, 02:14 PM

Put all the files used by the program into the jar file as said in post#2

Unsupported major.minor version 51.0

That says the class file was created by a newer version of java (1.7) than the version of java being used to execute the code: Java Plug-in 1.6.0_29.

**hwoarang69** · March 20th, 2013, 02:20 PM

i dont now how to put them in jar files. i was trying to put them in jar files in last post. but than u said something about Applets are not executed with the java command.

--- Update ---

so i need to download newversion of web java?

**Norm** · March 20th, 2013, 02:20 PM

The java command requires that the class it starts executing have a main() method.
Applets do not use a main() method.

Read the tutorial that I have given you several links to. It's explained there.

**hwoarang69** · March 20th, 2013, 02:23 PM

i asked do i need to download new version of java?

i already now applet dont have main method.

**hwoarang69** · March 20th, 2013, 02:23 PM

i asked do i need to download new version of java?

i already now applet dont have main method.

**Norm** · March 20th, 2013, 02:27 PM

The version of java that executes the class file must be compatible with the version of the JDK that created the class file. The new version of java JDK: 1.7 is NOT compatible with the older versions of java.
The javac command has options for creating class files that are compatible with older versions of java.

**hwoarang69** · March 20th, 2013, 02:54 PM

just download new version of java. and errors are gone. but animation isnt moving and cant see my player. is this bc of not having jar file?

**Norm** · March 20th, 2013, 02:59 PM

Are there any error messages?
Locally executing a class from a jar file or from a disk file should not make any difference.

**hwoarang69** · March 20th, 2013, 03:01 PM

no erros

**Norm** · March 20th, 2013, 03:05 PM

Try debugging the code by adding some println statements to print out messages showing execution flow and the values of variables as the code executes. The print out will help you see what the computer is doing when it executes your code.

**hwoarang69** · March 20th, 2013, 07:02 PM

ah now its give me this error: any idea? i have the new version

Java Plug-in 10.17.2.02
Using JRE version 1.7.0_17-b02 Java HotSpot(TM) Client VM
User home directory = C:\Users\dave
----------------------------------------------------
c: clear console window
f: finalize objects on finalization queue
g: garbage collect
h: display this help message
l: dump classloader list
m: print memory usage
o: trigger logging
q: hide console
r: reload policy configuration
s: dump system and deployment properties
t: dump thread list
v: dump thread stack
x: clear classloader cache
0-5: set trace level to <n>
----------------------------------------------------
Exception in thread "AWT-EventQueue-2" java.lang.NullPointerException
at Main.paint(Main.java:206)
at sun.awt.RepaintArea.paintComponent(Unknown Source)
at sun.awt.RepaintArea.paint(Unknown Source)
at sun.awt.windows.WComponentPeer.handleEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
at java.awt.EventQueue.access$200(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPri vilege(Unknown Source)
at java.security.ProtectionDomain$1.doIntersectionPri vilege(Unknown Source)
at java.awt.EventQueue$4.run(Unknown Source)
at java.awt.EventQueue$4.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPri vilege(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilter s(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(U nknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarch y(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)
Exception in thread "AWT-EventQueue-3" java.lang.NullPointerException
at Main.paint(Main.java:206)
at sun.awt.RepaintArea.paintComponent(Unknown Source)
at sun.awt.RepaintArea.paint(Unknown Source)
at sun.awt.windows.WComponentPeer.handleEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
at java.awt.EventQueue.access$200(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPri vilege(Unknown Source)
at java.security.ProtectionDomain$1.doIntersectionPri vilege(Unknown Source)
at java.awt.EventQueue$4.run(Unknown Source)
at java.awt.EventQueue$4.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPri vilege(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilter s(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(U nknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarch y(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)
Exception in thread "AWT-EventQueue-3" java.lang.NullPointerException
at Main.paint(Main.java:207)
at sun.awt.RepaintArea.paintComponent(Unknown Source)
at sun.awt.RepaintArea.paint(Unknown Source)
at sun.awt.windows.WComponentPeer.handleEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
at java.awt.EventQueue.access$200(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPri vilege(Unknown Source)
at java.security.ProtectionDomain$1.doIntersectionPri vilege(Unknown Source)
at java.awt.EventQueue$4.run(Unknown Source)
at java.awt.EventQueue$4.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPri vilege(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilter s(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(U nknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarch y(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)

Main.java
line205: public void paint(Graphics g) {
line206: background_class.paint(g, this);
line207: ground_class.paint(g);

**Norm** · March 20th, 2013, 07:05 PM

Exception in thread "AWT-EventQueue-2" java.lang.NullPointerException
at Main.paint(Main.java:206)

There is a variable with a null value when line 206 is executed. Look at line 206, find the variable with the null value and find out why it has a null value.

**hwoarang69** · March 20th, 2013, 07:44 PM

i dont understand why in eclipse it have no error in Main.class but on web it gives me error.

great now new error:

Java Plug-in 10.17.2.02
Using JRE version 1.7.0_17-b02 Java HotSpot(TM) Client VM
User home directory = C:\Users\dave
----------------------------------------------------
c:   clear console window
f:   finalize objects on finalization queue
g:   garbage collect
h:   display this help message
l:   dump classloader list
m:   print memory usage
o:   trigger logging
q:   hide console
r:   reload policy configuration
s:   dump system and deployment properties
t:   dump thread list
v:   dump thread stack
x:   clear classloader cache
0-5: set trace level to <n>
----------------------------------------------------
CacheEntry[http://localhost/E_COMMERCE/menu_pages/game_pages/java_game_2/Main.class]: updateAvailable=true,lastModified=Sat Nov 24 22:20:05 EST 2012,length=6998
CacheEntry[http://localhost/E_COMMERCE/menu_pages/game_pages/java_game_2/Enemy.class]: updateAvailable=true,lastModified=Sat Nov 10 10:28:15 EST 2012,length=2340
CacheEntry[http://localhost/E_COMMERCE/menu_pages/game_pages/java_game_2/Enemy_1.class]: updateAvailable=true,lastModified=Sat Nov 10 10:28:48 EST 2012,length=1834
CacheEntry[http://localhost/E_COMMERCE/menu_pages/game_pages/java_game_2/Platform.class]: updateAvailable=true,lastModified=Sat Nov 10 10:26:29 EST 2012,length=2535
CacheEntry[http://localhost/E_COMMERCE/menu_pages/game_pages/java_game_2/Item.class]: updateAvailable=true,lastModified=Sat Nov 10 10:26:41 EST 2012,length=1757
CacheEntry[http://localhost/E_COMMERCE/menu_pages/game_pages/java_game_2/Sprite_Sheet.class]: updateAvailable=true,lastModified=Sat Nov 10 07:29:27 EST 2012,length=1603
CacheEntry[http://localhost/E_COMMERCE/menu_pages/game_pages/java_game_2/Background.class]: updateAvailable=true,lastModified=Sat Nov 10 10:30:05 EST 2012,length=1535
Exception in thread "AWT-EventQueue-2" java.lang.NullPointerException
	at Main.paint(Main.java:204)
	at sun.awt.RepaintArea.paintComponent(Unknown Source)
	at sun.awt.RepaintArea.paint(Unknown Source)
	at sun.awt.windows.WComponentPeer.handleEvent(Unknown Source)
	at java.awt.Component.dispatchEventImpl(Unknown Source)
	at java.awt.Container.dispatchEventImpl(Unknown Source)
	at java.awt.Component.dispatchEvent(Unknown Source)
	at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
	at java.awt.EventQueue.access$200(Unknown Source)
	at java.awt.EventQueue$3.run(Unknown Source)
	at java.awt.EventQueue$3.run(Unknown Source)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
	at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
	at java.awt.EventQueue$4.run(Unknown Source)
	at java.awt.EventQueue$4.run(Unknown Source)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
	at java.awt.EventQueue.dispatchEvent(Unknown Source)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
	at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
	at java.awt.EventDispatchThread.run(Unknown Source)
CacheEntry[http://localhost/E_COMMERCE/menu_pages/game_pages/java_game_2/Ground.class]: updateAvailable=true,lastModified=Sat Nov 10 10:28:04 EST 2012,length=2312

       /*** paint method ***/
	@Override
	public void paint(Graphics g) 
	{
		background_class.paint(g, this);	              //line204
		ground_class.paint(g);                              //line205
	                                                                       //line 206
		player_class.paint(g);            
		for(int i = 0; i < platform_class.length; i++)
		{ platform_class[i].paint(g); }
		shoot_class.paint(g, player_class); //draw bullet
 
 
				enemy_class.paint(g, enemy_class);
 
		for(int i = 0; i < item_class.length; i++)
		{ item_class[i].paint(g); }
		score_class.paint(g, this, player_class);
 
	}/*** end of paint method ***/

the line look fine to me.

**Norm** · March 20th, 2013, 07:55 PM

What variable has the null value? If you don't know, add a println() statement to print out the values of all the variables.

Where is that variable assigned a value?

**hwoarang69** · March 20th, 2013, 08:07 PM

on line 204: i printed the value of 'this'

Main[panel0,0,0,900x400,layout=java.awt.FlowLayout]

on line 204: i printed the value of 'g'

sun.java2d.SunGraphics2D[font=java.awt.Font[family=Serif,name=Serif,style=bold,size=20],color=java.awt.Color[r=15,g=77,b=147]]

on line 204: i printed the value of 'background_class'

Background@31908ba7

they all have some values

**Norm** · March 20th, 2013, 08:13 PM

Did the program get the exception immediately after those println()s were executed?

Keep adding println() statements to show the variables used on each line until you see the variable that is null.

**hwoarang69** · March 20th, 2013, 08:15 PM

yes and printed the value right after the line 204

**Norm** · March 20th, 2013, 08:17 PM

Did the program get the exception immediately after those println()s were executed?

Keep adding println() statements to show the variables used on each line until you see the variable that is null.

Copy and post the whole contents showing the print outs and the exception error message

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