JRE version that supports Swing - Revisited

Hi All,
I have developed an application using swing components like JTextField, JFormattedTextField, JTextArea, JTable, etc. I had installed JDK 1.4.1 to develop this application.
I wanted to test it in another machine. I have installed j2re-1_4_1_01-windows-i586, the machine is running on Windows 2000, Advanced server.
When I try to run the Main class, I got an error saying
Exception in thread "main" java.lang.NoClassDefFound Error: javax/swing/JFormattedTextField not found
I had posted this on the forum yesterday. One of the replies suggested that I implitly specify the classpath for rt.jar and remove all other runtime versions.
I have uninstalled all the versions of the JRE, re-installed JRE 1.4.1, included rt.jar in the class path. Now I get this.
C:\Filecollection>java filecollection.FileCollectionClass
Exception in thread "main" java.lang.UnsupportedClassVersionError: javax/swing/JFormattedTextField (Unsupported major.minor version 48.0)
at java.lang.ClassLoader.defineClass0(Native Method)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.access$100(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)
at filecollection.FileCollectionClass.<init>(FileCollectionClass.java:20)
at filecollection.FileCollectionClass.main(FileCollectionClass.java:50)
Thanks for your help.
Regards
Lakshmi

I do not have a definitive answer for you, but, I seem to remember seeing this message when I was using a compiler that was not sufficient to understand a new jre.
I hope this leads in the right direction.
jarshe

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JRE version that supports Swing?

Hi All,
I have developed an application using swing components like JTextField, JFormattedTextField, JTextArea, JTable, etc. I had installed JDK 1.4.1 to develop this application.
I wanted to test it in another machine. I have installed j2re-1_4_1_01-windows-i586, the machine is running on Windows 2000, Advanced server.
When I try to run the Main class, I get an error saying
Exception in thread "main" java.lang.NoClassDefFound Error: javax/swing/JFormattedTextField not found
Do I need to install the JDK kit in that machine? Isnt the JRE enough?
Thanks for your help.
Regards
Lakshmi

Hi,
I have uninstalled all the versions of the JRE, re-installed JRE 1.4.1, included rt.jar in the class path. Now I get this.
C:\Filecollection>java filecollection.FileCollectionClass
Exception in thread "main" java.lang.UnsupportedClassVersionError: javax/swing/JFormattedTextField (Unsupported major.minor version 48.0)
at java.lang.ClassLoader.defineClass0(Native Method)
at java.lang.ClassLoader.defineClass(Unknown Source)
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at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)
at filecollection.FileCollectionClass.<init>(FileCollectionClass.java:20)
at filecollection.FileCollectionClass.main(FileCollectionClass.java:50)
Regards
Lakshmi

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JRE version that supports Swing - Revisited

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