please help running programs created in jsdk 1.4 into jsdk 1.6

[gener de vera]

I have created programs in jsdk1.4. Compiling and running the applications work fine. But when I upgraded to jsdk1.6 running the applications became a problem. The noclassdeffound error occurs. I am using JPadpro as my IDE and have set the required path for the jsdk.

[Ulf Dittmer]

Welcome to JavaRanch.

No classes have ever been removed from JSE, so whatever code worked with Java 1.4 should work with Java 6. What error message are you getting, exactly?

[gener de vera]

This is the error that comes out when I run the application in jdk1.6.

Exception in thread "main" java.lang.NoClassDefFoundError: frame
: Frametest)
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:61
at java.security.SecureClassLoader.defineClass(SecureCla
4)
at java.net.URLClassLoader.defineClass(URLClassLoader.ja
at java.net.URLClassLoader.access$000(URLClassLoader.jav
at java.net.URLClassLoader$1.run(URLClassLoader.java:195
at java.security.AccessController.doPrivileged(Native Me
at java.net.URLClassLoader.findClass(URLClassLoader.java
at java.lang.ClassLoader.loadClass(ClassLoader.java:303)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.j
at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.j
Could not find the main class: frametest. Program will exit.

[Ulf Dittmer]

What command are you entering on the command line to run the program? Is the class "frametest" in the current directory, or are you using the "-cp" switch to specify the classpath where the JRE should look to find it?

[gener de vera]

I am using the JPadPro as my IDE, what I did is simply changed the path of the jdk to the location of jdk1.6 as what I did with jdk1.4. No other options were changed but this couldn't run the applications. However when I revert back to jdk1.4, running the application doesn't generate the error.

[Ulf Dittmer]

Well, I don't know how JPadPro works, but it's definitely an IDE configuration issue, not a Java 6 issue.

[salvin francis]

I dont knw how jpadpro works too,
but the error sounds like the jvm is unable to find main class,

are you sure the classpath is properly set ?

[Campbell Ritchie]

salvin francis wrote:are you sure the classpath is properly set ?

Beware . . . you are usually better off with no classpath at all. If you do have a classpath, then simply add .: (not Windows) or .; (DOS/Windows) at its beginning.

If this is an IDE issue, then this thread should move to the IDEs forum.

[gener de vera]

Thanks everyone for the reply. I'll try to look into the IDE options coz I can't still work it out.

[salvin francis]

Campbell Ritchie wrote:

salvin francis wrote:are you sure the classpath is properly set ?

Beware . . . you are usually better off with no classpath at all. If you do have a classpath, then simply add .: (not Windows) or .; (DOS/Windows) at its beginning.

If this is an IDE issue, then this thread should move to the IDEs forum.

hmm

this is what i mostly do:

set classpath = .;%classpath%;C:\Program Files\Java\jdk1.5.0_05\lib;

considering java is indeed installed at that location

the %classpath% trick is good since it does not alter existing classpath

just thought of sharing...

[Michael Mathewson]

Don't know if you ever figured this one out but its a version compatibility issue with running 1.4 apps while having 1.6.0_15 --> 1.6.0_17 installed. The latest version 1.6.0_18 works fine with 1.4 apps.