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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 10/1/2012 9:27 AM, piscesboy wrote:
> 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.
>

I guess I should have been more complete, if you need the magic to 
compile, you will need the magic to run it too.

-- 

Knute Johnson

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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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