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Layout Best Practices

Richard Wright-OracleApr 20 2009 — edited Nov 17 2009
<b>Problem Description</b>

A developer needs to be able to create a rich client interface and avoid basic layout issues that tend to be pervasive across screens and applications. There are a number of low-level layout issues within ADFv that:
<ol>
<li>Tend to repeat themselves across screens and across applications.</li>
<li>Impact perception of usability, quality, and fit ‘n’ finish.</li>
<li>Are annoying to users in the aggregate. Although no single item is terrible, but a collection of 6 items, repeating themselves on multiple screens gets frustrating and detracts from the message.</li>
</ol>
In most cases, there’s a simple approach and best practice that will assist developers in avoiding these pitfalls.

<b>Technical Best Practice Description</b>

This Layout Best Practices document provides a list of known layout issues that are encountered when developing a Rich Client Interface and how to avoid them in your application development.

Various ADF Components are described and demonstrated in this document including document, showDetailItem, decorativeBox, panelSplitter, panelStretchLayout, panelBorderLayout, and so on. It takes many of these components in combination to achieve the desired layout for a page and / or an application.

Click here to see the document that describes these best practices.

Edited by: Richard Wright on Nov 17, 2009 5:26 PM

Comments

798692
JRE may not be enabled in your browser. Check whether it is enabled or not?

You can verify that from 'Tools -> Internet Options -> Advanced -> Java (sun)'
User_64CKJ
880537 wrote:
..However, when I view the page in IE8, the applet displays an error message (which I can't seem to decipher).
I'm having trouble deciphering that message as well. ..Mostly because you did not copy/paste it.
883540
my bad...the error looks like this:

java.lang.UnsupportedClassVersionError: HelloWeb : Unsupported major.minor version 51.0
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClassCond(Unknown Source)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at sun.plugin2.applet.Applet2ClassLoader.findClass(Unknown Source)
at sun.plugin2.applet.Plugin2ClassLoader.loadClass0(Unknown Source)
at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Unknown Source)
at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.plugin2.applet.Plugin2ClassLoader.loadCode(Unknown Source)
at sun.plugin2.applet.Plugin2Manager.createApplet(Unknown Source)
at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Exception: java.lang.UnsupportedClassVersionError: HelloWeb : Unsupported major.minor version 51.0
EJP
The JVM being used by the browser is earlier than the version of javac you compiled the applet with.

So update the browser's JVM or use the -target switch of javac.

If you get a message you can't 'decipher', post it. Just saying you can't decipher it only wastes time.
883540
I'm running Java SE 7, which should be the latest version of Java available. Does this mean I need to update my compiler?

Sorry that I keep asking these questions but I want to make sure my applets will run properly in the future.
Kayaman
Answer
880537 wrote:
I'm running Java SE 7, which should be the latest version of Java available. Does this mean I need to update my compiler?
No, it means that your browser isn't running Java 7, but has an older plugin.
Sorry that I keep asking these questions but I want to make sure my applets will run properly in the future.
Then maybe use the target flag when compiling so it's compatible with 1.5. Version 1.6 tops. Unless you really need to use all the new features.
Marked as Answer by 883540 · Sep 27 2020
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Locked on Sep 11 2009
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