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Re: Newbie Question: Help using JavaFX on Java 7 for Mac OS X 10.7.5...

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On Sunday, September 30, 2012 8:33:32 PM UTC-4, Lew wrote:
> Knute Johnson wrote:
> 
> > piscesboy wrote:
> 
> >> I just downloaded and installed the Java7 update 7 JDK for Mac OS X via the convenient .dmg installer on the Oracle website. JavaFX SDK is supposed to be included
> 
> >
> 
> >> I want to get started on some example JavaFX applications...a simple HelloWorld app to get started using it and to verify that JavaFX works on my system. Here's the code for HelloWorld.java:
> 
> > 
> 
> 
> 
> . . . 
> 
> >> HelloWorld.java:2: error: package javafx.scene does not exist
> 
> >> import javafx.scene.Group;
> 
> >>                     ^
> 
> >> HelloWorld.java:3: error: package javafx.scene does not exist
> 
> 
> 
> > . . .  
> 
> >> It is obvious that it is not finding the JavaFX library to compile. I did a search and found that the jfxrt.jar file is required to compile and run it. But it is located inside of the folder:
> 
> > 
> 
> >> /Library/Java/JavaVirtualMachines/jdk1.7.0_07.jdk/Contents/Home/jre/lib
> 
> > 
> 
> >> which is inside of the JDK virtual machine folder for Java 7. I don't think there is any magic classpath command needed to compile this simple program but I could be wrong.
> 
> 
> 
> Clearly.
> 
> 
> 
> > Yes you need the magic CLASSPATH to compile it.  I don't know why when 
> 
> > the put FX in the JDK and JRE that it isn't already in the classpath but 
> 
> > it isn't.  So just add it to your CLASSPATH and it will work just fine.
> 
> 
> 
> This is one of the rare use cases where it actually makes sense to put the JAR 
> 
> in the "CLASSPATH" environment variable (along with "."). Doing this has perils, 
> 
> including necessitating the explicit mention of "." as a classpath element.
> 
> Under most circumstances one would eschew "CLASSPATH" in favor of the more 
> 
> flexible and less damaging "-classpath" or "-cp" command-line parameter.
> 
> However, when something is so much to be desired as a routine part of your 
> 
> build all the time as JavaFX might be in this instance, then the use of 
> 
> either "CLASSPATH" or even (gasp!) extension libraries becomes an option.
> 
> 
> 
> Whatever you choose, make sure you have actually RTFMed on tools classpaths.
> 
> 
> 
> -- 
> 
> Lew

I compiled with the -cp option and now it compiles fine...but now it fails to run when I invoke:

java HelloWorld

I get:

Exception in thread "main" java.lang.NoClassDefFoundError: javafx/application/Application
	at java.lang.ClassLoader.defineClass1(Native Method)
	at java.lang.ClassLoader.defineClass(ClassLoader.java:791)
	at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
	at java.net.URLClassLoader.defineClass(URLClassLoader.java:449)
	at java.net.URLClassLoader.access$100(URLClassLoader.java:71)
	at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
	at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:423)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:356)
	at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:480)
Caused by: java.lang.ClassNotFoundException: javafx.application.Application
	at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
	at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:423)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:356)


Again...this seems to be a missing class definition problem...which leads me to believe there is a deeper flaw in how Java7 is set up in my machine. 

I followed the instructions for downloading and installing Java7 update 7 from the Oracle website, I used the Java Preferences Application to set my default JDK to jdk 1.7.0 as per the instructions, but now it's having all these different classpath issues that do not happen when I use the standard Java 6 JDK from the Apple vendor as opposed to the Oracle vendor Java 7 JDK.

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Thread

Newbie Question: Help using JavaFX on Java 7 for Mac OS X 10.7.5... piscesboy <oraclmaster@gmail.com> - 2012-09-29 15:00 -0700
  Re: Newbie Question: Help using JavaFX on Java 7 for Mac OS X 10.7.5... Knute Johnson <nospam@knutejohnson.com> - 2012-09-29 17:51 -0700
    Re: Newbie Question: Help using JavaFX on Java 7 for Mac OS X 10.7.5... Lew <lewbloch@gmail.com> - 2012-09-30 17:33 -0700
      Re: Newbie Question: Help using JavaFX on Java 7 for Mac OS X 10.7.5... piscesboy <oraclmaster@gmail.com> - 2012-10-01 09:27 -0700
        Re: Newbie Question: Help using JavaFX on Java 7 for Mac OS X 10.7.5... Knute Johnson <nospam@knutejohnson.com> - 2012-10-01 11:01 -0700
          Re: Newbie Question: Help using JavaFX on Java 7 for Mac OS X 10.7.5... piscesboy <oraclmaster@gmail.com> - 2012-10-01 11:32 -0700
            Re: Newbie Question: Help using JavaFX on Java 7 for Mac OS X 10.7.5... Knute Johnson <nospam@knutejohnson.com> - 2012-10-01 12:36 -0700
              Re: Newbie Question: Help using JavaFX on Java 7 for Mac OS X 10.7.5... piscesboy <oraclmaster@gmail.com> - 2012-10-03 00:50 -0700
                Re: Newbie Question: Help using JavaFX on Java 7 for Mac OS X 10.7.5... Knute Johnson <nospam@knutejohnson.com> - 2012-10-03 06:39 -0700
            Re: Newbie Question: Help using JavaFX on Java 7 for Mac OS X 10.7.5... Jeff Higgins <jeff@invalid.invalid> - 2012-10-02 03:02 -0400
            Re: Newbie Question: Help using JavaFX on Java 7 for Mac OS X 10.7.5... Jeff Higgins <jeff@invalid.invalid> - 2012-10-02 03:16 -0400
              Re: Newbie Question: Help using JavaFX on Java 7 for Mac OS X 10.7.5... piscesboy <oraclmaster@gmail.com> - 2012-10-03 00:46 -0700
                Re: Newbie Question: Help using JavaFX on Java 7 for Mac OS X 10.7.5... markspace <-@.> - 2012-10-03 08:48 -0700
                Re: Newbie Question: Help using JavaFX on Java 7 for Mac OS X 10.7.5... Jeff Higgins <jeff@invalid.invalid> - 2012-10-03 16:00 -0400
        Re: Newbie Question: Help using JavaFX on Java 7 for Mac OS X 10.7.5... Lew <lewbloch@gmail.com> - 2012-10-01 13:10 -0700
          Re: Newbie Question: Help using JavaFX on Java 7 for Mac OS X 10.7.5... piscesboy <oraclmaster@gmail.com> - 2012-10-01 18:38 -0700
            Re: Newbie Question: Help using JavaFX on Java 7 for Mac OS X 10.7.5... Lew <lewbloch@gmail.com> - 2012-10-02 15:55 -0700

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