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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
Code :
my folder tree
Code :-java_game -java.php -main.class -item.class -background.clas -enemy.class -... -music -... -image -...
Put the classes into a jar file and add an archive= attribute to the <applet tag in the htmlQuote:
my games has alot of classes
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??
No, you don't need to put the classes in packages.Quote:
do i have to make a package to create all thoses jar files??
i am confuse
i though i cant make applet into jar files?Quote:
Put the classes into a jar file and add an archive= attribute to the <applet tag in the html
You can put any files into a jar file.
What is done with that jar file depends on what program is reading it.
....so let me try again
here is my folder. it has all my java class and images and sounds.
Attachment 1904
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:
Quote:
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
Put all the files used by the program into the jar file as said in post#2
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.Quote:
Unsupported major.minor version 51.0
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?
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.
i asked do i need to download new version of java?
i already now applet dont have main method.
i asked do i need to download new version of java?
i already now applet dont have main method.
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.
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?
Are there any error messages?
Locally executing a class from a jar file or from a disk file should not make any difference.
no erros
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.
ah now its give me this error: any idea? i have the new version
Quote:
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);
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.Quote:
Exception in thread "AWT-EventQueue-2" java.lang.NullPointerException
at Main.paint(Main.java:206)
i dont understand why in eclipse it have no error in Main.class but on web it gives me error.
great now new error:
Code :
Code :/*** 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.
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?
on line 204: i printed the value of 'this'
on line 204: i printed the value of 'g'Quote:
Main[panel0,0,0,900x400,layout=java.awt.FlowLayout]
on line 204: i printed the value of 'background_class'Quote:
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]]
they all have some valuesQuote:
Background@31908ba7
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.
yes and printed the value right after the line 204
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