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Applet question - .class vs .java

 
James Brooks
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Hi again,

Question about applets this time. When using Applet Viewer in NetBeans (right-click the .java app -> run file), I get the error
class Applets/myApplet.class not found. I started this Applet as a normal Java class, so it has a .java extension, and not a .class extension. How do I convert to .class or create a .class file? My book does not help at all!

Thanks,

-Patrick

Hello. My name is Inigo Montoya. You killed my father. Prepare to die.

 
Keith Lynn
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posted 17 years ago
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The .class file is created if you compile the .java file without errors.
 
James Brooks
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Hmmm, well, then, that's not it. When I click 'run file', a blank applet opens, and at the bottom it says 'applet not initialized'. Below are the messages I got, any ideas?:

init:
deps-jar:
Compiling 1 source file to C:\Documents and Settings\Owner.Mynotebook\Ch5ItIs\build\classes
compile-single:
run-applet:
load: class ch5itis/myApplet.class not found.
java.lang.ClassNotFoundException: ch5itis.myApplet.class
at sun.applet.AppletClassLoader.findClass(AppletClassLoader.java:183)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.applet.AppletClassLoader.loadClass(AppletClassLoader.java:127)
at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
at sun.applet.AppletClassLoader.loadCode(AppletClassLoader.java:626)
at sun.applet.AppletPanel.createApplet(AppletPanel.java:778)
at sun.applet.AppletPanel.runLoader(AppletPanel.java:707)
at sun.applet.AppletPanel.run(AppletPanel.java:361)
at java.lang.Thread.run(Thread.java:619)
Caused by: java.io.FileNotFoundException: C:\Documents and Settings\Owner.Mynotebook\Ch5ItIs\build\classes\ch5itis\myApplet\class.class (The system cannot find the path specified)
at java.io.FileInputStream.open(Native Method)
at java.io.FileInputStream.<init>(FileInputStream.java:106)
at java.io.FileInputStream.<init>(FileInputStream.java:66)
at sun.net.www.protocol.file.FileURLConnection.connect(FileURLConnection.java:70)
at sun.net.www.protocol.file.FileURLConnection.getInputStream(FileURLConnection.java:161)
at sun.applet.AppletClassLoader.getBytes(AppletClassLoader.java:295)
at sun.applet.AppletClassLoader.access$100(AppletClassLoader.java:44)
at sun.applet.AppletClassLoader$1.run(AppletClassLoader.java:173)
at java.security.AccessController.doPrivileged(Native Method)
at sun.applet.AppletClassLoader.findClass(AppletClassLoader.java:170)
... 8 more
BUILD SUCCESSFUL (total time: 7 seconds)

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Ulf Dittmer
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Is the class in package "ch5itis"? That's what the error message says it is expecting. What does the applet tag in the HTML file look like?
 
James Brooks
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Yeah, I declared package Ch5ItIs;, but that doesn't help. I'm just using NetBeans; right-click the class name, then click 'run file'. I shouldn't have to use an HTML file this way, right? Again, the applet window opens, but no text appears on the applet, and at the bottom is says
'Start: applet not initialized'

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James Brooks
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I even created the below HTML doc and viewed it in IE7, but it just had the outline 720x560 size with no content, had the x in the upper left.

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Jesper de Jong
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posted 17 years ago
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Originally posted by Patrick Brooks:
Yeah, I declared package Ch5ItIs;, but that doesn't help. ...


Java is case-sensitive, so "Ch5ItIs" with a capitals C and I is not the same as "ch5itis" with lower-case letters.

Jesper's Blog - Pluralsight Author Page

 
Ulf Dittmer
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The tag is called "applet", not "object".
 
James Brooks
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I actually did declare it ch5ItIs, that was just a typing slip-up here on the BB. Ulf: my book says it is better to use <object> than <applet>, but that they do the same thing.

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Ulf Dittmer
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my book says it is better to use <object> than <applet>, but that they do the same thing.



There are reasons why it would be preferable in some situations, but not generally. And it doesn't literally do the same thing in the sense that "applet" can be replaced by "object", and everything else works the same. The object tag is much more complicated. Try an applet tag and see what happens.
 
James Brooks
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Thanks for the explanation, Ulf. I tried the <applet> tag, and the same thing happened. Any ideas? I know it's hard to troubleshoot without the NetBeans project laid out in front of you.

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Ulf Dittmer
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What does you applet tag look like, and where are the various applet files, i.e. what is the directory layout? For the tag to work in the way you posted earlier, the class files need to be in the same directory as the HTML file.

Are there any messages in the Java Console?
[ April 14, 2007: Message edited by: Ulf Dittmer ]
 
James Brooks
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Why, silly me, I had declared a wrong package name, or, rather, camel-cased it when I shouldn't have. Thanks for the help, Ulf!

-Patrick

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