New installation woes - SQLDeveloper on Oracle Linux x64 and Oracle 11g XE

Note that as an experienced Oracle developer in enterprise environments running MS Windows OS, I am familiar with SQLDeveloper for Windows. I don't have a lot of experience with Linux however. I don't find it intimidating, I just don't have a lot of accumulated knowledge.
I have recently been trying to set up a development environment on my Windows7 Professional x64 laptop.
1. Installed Oracle VBox
2. Installed Oracle Linux 5.2 inside the VBox (because Oracle 11g XE is not certified on 64 bit Windows, needed to go with a Linux OS)
3. Installed Oracle DB 11.2 XE
4. Installed JDK as instructed in the SQLDeveloper release notes for Linux x64
5. Installed SQLDeveloper 3.1.07.42-1
No apparent issues with any of the installations.
Problem : I can run SQL Plus from the command line, but when I click on the icon for SQLDeveloper, nothing happens. No error messages, nothing else.
Question #1 : Unsure how to debug/troubleshoot this. Will read through the installation and release notes for SQLDeveloper, but any suggestions would be welcome.
Question #2 : Could this be due to an issue with the JDK installation? It appeared to be successful (no obvious issues) but I can't see anything in the Oracle Linux menu system that tells me the JDK was installed successfully. How can I confirm that the JDK installation was successful?
Edited by: Peter Hartgerink on Jun 19, 2012 9:12 AM

>
The Linux x64 version of SQLDeveloper doesn't come bundled with JDK. There is a version of JDK recommended, with an advisory to install it before installing SQLDeveloper. This I did, with apparent success. I guess I'll have to install the JDK again and check my Java versions afterwards. Thanks.
>
I don't know what JDK you downloaded since you didn't say. What version was it? Post the link.
I find it hard to believe that the JDK version recommended was 1.4.2 since that is an ANCIENT version of Java, you have to hunt to even find it for download and most importantly the sql developer main download page clearly announces what version of Java is needed.
http://www.oracle.com/technetwork/developer-tools/sql-developer/downloads/index.html
>
JDK Support
Oracle SQL Developer 3.1 is shipped with JDK1.6.0_11. However, you can connect to and use any JDK 1.6.0_11 or above. To use an existing JDK, download the zip files listed below "with JDK already installed."
>
As you can see you need JDK 1.6.0_11 or above.
If the version you say was recommended was actually 1.4.2 then that is an error; post the details so the developers can get that error fixed.
I don't know what is on your system and can only go by the information you provide
>
4. Installed JDK as instructed in the SQLDeveloper release notes for Linux x64
java version "1.4.2"
>
You either downloaded version 1.4.2, which seems unlikely, or your Linux included 1.4.2 and it is being used when you try to launch sql developer.
Perhaps your system now has multiple versions of Java on it but the version being used by sql developer is the wrong one. If so that is the issue you need to resolve.

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server.
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