J2SE 1.4 generated classes on older JRE versions

Maybe a newbie topic but is it normal that JDK 1.4 generated classes only work on the JRE 1.4 runtime environment ?
If so, how do I compile to work on older runtime environments ?
A link to a page with info on this would be most appreciated...

Thanks,
That was the link I was looking for.
FYI : To make my applet run with the default JVM for Internet Explorer I had to compile to target 1.1 and strip the code from all Java 2 code. Strange, as I have IE 6.0 and you would expect it to come with a Java 2 runtime...
Anyway, my first applet is on the Net now : http://www.ebo.bewoner.antwerpen.be/Shift/Game.html .
I wonder if it works from other clients than mine...and especially other machines that a Windows PC !

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I have been getting java.lang.ClassNotFoundException: ZeroApplet.class and java.lang.ClassNotFoundException: JavaToJS.class crashes with JRE version 1.6.0_26-b03-384-10M3425 VM executing a Java Applet. Is Apple aware of this problem? No longer supported?

My web page uses a Java Applet to allow my visitors to replay chess games; the Chess Viewer Deluxe applet was written by Nikolai Pilafov some time ago and has been working properly for some time (until recently). I don't monitor this part of my site regularly so I am not sure when it began to fail. On his web site [http://chesstuff.blogspot.com/2008/11/chess-viewer-deluxe.html] he has a link to check LiveConnect object functionality (which fails for OBJECT tags). His recommendation is to "seek platform specific support which might be available from the JRE developers for your platform".
I have been getting java.lang.ClassNotFoundException: ZeroApplet.class and java.lang.ClassNotFoundException: JavaToJS.class crashes with JRE version 1.6.0_26-b03-384-10M3425 VM executing a Java Applet. Until I checked the LiveConnect object functionality, I was unable to identify the source of the console error messages. This does seem to be the smoking gun.
Is Apple aware of this problem? Are these classes no longer supported? Has anyone else had this problem? You can attempt to recreate the problem locally by going to my web page: http://donsmallidge.com/DonSmallidgeChess.html
Thanks in advance for any help you can provide!
Abbreviated Java Console output:
Java Plug-in 1.6.0_26
Using JRE version 1.6.0_26-b03-384-10M3425 Java HotSpot(TM) 64-Bit Server VM
load: class ZeroApplet.class not found.
java.lang.ClassNotFoundException: ZeroApplet.class
    at sun.applet.AppletClassLoader.findClass(AppletClassLoader.java:211)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
    at sun.applet.AppletClassLoader.loadClass(AppletClassLoader.java:144)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
    at sun.applet.AppletClassLoader.loadCode(AppletClassLoader.java:662)
    at sun.applet.AppletPanel.createApplet(AppletPanel.java:807)
    at sun.plugin.AppletViewer.createApplet(AppletViewer.java:2389)
    at sun.applet.AppletPanel.runLoader(AppletPanel.java:714)
    at sun.applet.AppletPanel.run(AppletPanel.java:368)
    at java.lang.Thread.run(Thread.java:680)
load: class JavaToJS.class not found.
java.lang.ClassNotFoundException: JavaToJS.class
    at sun.applet.AppletClassLoader.findClass(AppletClassLoader.java:211)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
    at sun.applet.AppletClassLoader.loadClass(AppletClassLoader.java:144)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
    at sun.applet.AppletClassLoader.loadCode(AppletClassLoader.java:662)
    at sun.applet.AppletPanel.createApplet(AppletPanel.java:807)
    at sun.plugin.AppletViewer.createApplet(AppletViewer.java:2389)
    at sun.applet.AppletPanel.runLoader(AppletPanel.java:714)
    at sun.applet.AppletPanel.run(AppletPanel.java:368)
    at java.lang.Thread.run(Thread.java:680)

I just went up to check the LiveConnect object functionality page AND IT WORKED THIS TIME! I must confess, this is very mysterious. I will do some more checking and reply here if I can determine why it is working now (and more importantly, why it didn't work before).

JDK 5 generated bytecode on older JREs

I am using enhanced 'for' loops that come with JDK5. Also, I will be using the new synchronization primitives and various other very JDK5-specific features.
Would like to know if can safely drop a JDK 5 generated .jar/.class into a 1.4 JRE. I'm expecting that these new language features wouldn't have necessitated new JVM instructions, and so can be run on JRE 1.4 as well.
Some Developer.

in JVM stands for (virtual) machine. Intuitively, I
thought, the enhanced for loop is just a syntactic
sugar for the developers, so would not require
changes in the JVM instruction set.For iterating over Collections, the enhanced for loop generates calls to a new 1.5-only API. Tough.
Google around (or search the forums) for compiling 1.5 for loops to 1.4 VMs. People have written bridge products to help with this.
Needless to say, I'm surprised and also somewhat
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Just because it's a virtual machine, doesn't mean that code generated today will run on VMs written a year or 10 years ago. That would imply that once you lay down a API in the runtime, you are never ever allowed to change it, or add to it, for the infinite future..

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Hi All!
Can someone offer some guidance on what version(s) of J2SE/JRE we should have installed on our clients (PCs)? We have standardized on 1.4.2_13 and are moving to 1.4.2_15 for Vista support, but we've run into several situations where SAP is asking for us to also install 1.5 or 1.6, and we also have other vendors asking for various versons of J2SE/JRE. In the past we tried to use the same version as the version on the server, but we're finding this is hard to do.
Also, if you're running multiple versions, how do you manage cases where 2 browser apps want to use different versions since (at least with IE) it appears only one can be the default.
Thanks!
Jeff

Jeff,
Unfortunately, as you have realised, you're stuffed when it comes to IE and Java. Only one can be used.
We have to produce a certified list of apps that can be run against a common JRE. It looks like a neat matrix sheet and normally works around the lowest common denominator of JRE.
Unless SAP don't support you on older JRE versions, don't be bullied by them into upgrading.
Unless there is a very compelling reason (e.g. you need a patch that requires an upgrade) then I wouldn't change it, for simplicities sake.
I found this link to be of use though:
Re: Assigning Frieght conditions by Vendor
Best Regards,
Darryl

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Background:
As of 7u25 (and later), Java Webstart applications launch with a different class loader than pre-7u25.
My Java Webstart application has supported versions that were built with older versions of the JDK (e.g. Java 5, 6, 7u21 or earlier). These applications run with their required JRE version, enforced through JNLP. Once Java 7u25 is installed locally, these older applications fail to launch, due to classloader differences.
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I confirm your findings when using shortcuts to try specific versions of JavaWS with 7u25 or later installed:
JRE 5u14 launched and the classloader was as pre 7u25
JRE 6u43 would not launch
JRE 7u21 launched but the classloader was not as pre 7u25
You can launch the shortcut with the JavaWS -verbose option to display a messagebox with valuable information.
I am keeping a close watch on this thread.

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is there a way for me to know what Java version that would have been or could have been compiled against?No.
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What's the business requirement that drives this request?
Edited by: dcminter on 03-Mar-2010 18:54

User defined data type generated class

Hi
When defining a new data type in the local dictionary, one has to option of generating a representation class.
I have done this and indeed received the class in my app.
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Thank you for your assistance
Regadrs
yuval

Hello Y PEERY
I am not clear which context you are talking about .
Are you taking about simple type inside local dictonary ?
or
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(for webdynpro only)
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BR
Satish Kumar

At the time of generating .class files i got below warning.

Hi all,
i develop one oaf page and move to server and generate .class files.
at the time of generate .class files i got below error.
plz help me.
*[appldev@wnsfinapp webui]$ javac AgingBucketsCO.java -deprecation*
AgingBucketsCO.java:114: warning: setRedirectURL(java.lang.String) in oracle.apps.fnd.framework.webui.OAPageContext has been deprecated
pageContext.setRedirectURL(
*^*
*1 warning*
Thanks
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Edited by: its urgent on Jan 30, 2012 4:47 AM

Hi Pratap,
thanks for your replay,
i register the page in apps its working fine.
but my page having go button.normally whenever goto the GO button it display hyperlink.
in my local machine displays hyperlink.after move to server it displays cursor.
Plz help me
Thanks
Seshu.

Getting generated class files using the compiler api??

I am writing a compiler/IDE for java, and i use the new JavaCompiler API
(javax.tools.JavaCompiler)
i want to ask, is it possible to get the generated class file(compiled file) names??
can anyone help me with this, read at the documentation and i have no idea which one is used to do such thing..
Or is it impossible??
Thanks, please guide me on this..

E.D.-inc wrote:
I am writing a compiler/IDE for java, and i use the new JavaCompiler API
don't.
i want to ask, is it possible to get the generated class file(compiled file) names??
yes, probably (after all, other tools can do it). Don't ask me how though, I've never had a need to.
can anyone help me with this, read at the documentation and i have no idea which one is used to do such thing..
no. Someone else reading the documentation for you won't help you any. Read it yourself, you might learn something.

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I use xsds with jaxb in a number of related projects. To avoid duplication I've factored out commonly used elements into their own xsd in a separate project. I then include these in the xsds that need them.
I generate classes with jaxb for each project. I'm now trying to get jaxb so far as to reuse the already generated classes for the common elements.
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Thx for any help

JAXB questions should be better directed to the users list of http://jaxb.dev.java.net/
you should subscribe to the 'users' mailing list, then post a question there.
Thank you!

Namespace issue with oracg generated classes

Hi,
I'm having problems generating classes with oracg from the Java Xdk from an XML schema. All classes are generated, but do not compile. In some sources (mostly in the type classes) "public void addSomething(null.Something theSomething)" is generated as the method declaration, and that doesn't compile. When I add a targetnamespace to the xsd file, the generated sources compile (the 'null.' is replaced with 'myPackage.', but when I generate an XML document, I contains a namespace reference (ns1) like this:
<ns1:Note xmlns:ns1 = "http://www.somewhere.org">
<ns1:Form>
<ns1:Reference>
<ns1:ReferenceNbr>1</ns1:ReferenceNbr>
<ns1:ReferenceType>1</ns1:ReferenceType>
</ns1:Reference>
</ns1:Form>
</ns1:Note>
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<Note>
<Form>
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Kind regards.

Did you try adding the the XmlSeeAlso annotation to the webservice
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Generated Class is not called by Inbound Proxy

Uploading data to Ztable of ECC by using inbound proxy.
The messages are tranfered to SAP ECC from SAP XI.
Monitoring in SXMB_MONI in SAP XI DEV can see Success flag
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In Reciever XI Adapter set the addressing type URL.
Coding is correct in the method of the generated class.
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hi
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<!ELEMENT rights (
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when i use xjc to create binding files, I got an error:
trying to create the same field twice: value.
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btw, i use latest version of jaxb.
Thanks in advance.

hi Vincentq,
What function are you using to create the attachment? Have you looked at SAP_WAPI_ATTACHMENT_ADD?
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Calling Stored Procedure w/JPublisher generated classes

Hi,
We are trying to pass Oracle nested tables as input/output parameters to several of our stored procedures to support bulk binding operations in the database from our applications. We have some database defined types and stored procedures that use these as input/output parameters which have been tested and working at the database level. I managed to get JPublisher to create these classes and compile fine, but I am not sure exactly how to register these classes as parameters with the stored procedure Java call. Any assistance is appreciated.
Here is a sample of the db types/procedures:
TYPE USER_APP_TYPE IS OBJECT
    User_ID             VARCHAR2(50), -- input fields
    App_ID              VARCHAR2(50),
    App_Type            VARCHAR2(50),
    App_Obj_ID          VARCHAR2(50),
    Status              VARCHAR2(30),   -- output fields
    Desc_String         VARCHAR2(255),
    Comments            VARCHAR2(255)
TYPE USER_APP_LIST IS TABLE OF USER_APP_TYPE;
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AS
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END PKG_MOD_BULK;So using JPublisher 3 classes were generated with constructors and getter/setter methods:
UserAppType.java
UserAppTypeRef.java
UserAppList.java
My consumer POC code looks like this:
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    public static void main(String[] args)
        Connection conn = null;
        try
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            String Password = "pass";
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            Class.forName("oracle.jdbc.OracleDriver");
            conn = DriverManager.getConnection("jdbc:oracle:thin:@mydatabse.com:1521:mysid", UserName, Password);
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        finally
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            catch (Exception e) {}
}So this code will compile and run up to the stored procedure call itself, but I'm not sure how to set the parameters for in/out with these generated classes. Any ideas?

Anyone? Still haven't figured this one out...

J2SE 1.4 generated classes on older JRE versions

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