Most of those solution took about 10 mins googling to find out, when it comes to linux the Internet is very rich it’ll help you in all your problems.

Note: I’m not a Linux expert so there might be some non-precise terms used in my description also there might be better solutions, this is what I tried and worked.

Partitioning for installation

Basically you need two partitions a root partition and a swap partition, for the root you need 15-20 GB, for the swap it is recommended to be double the RAM size but I don’t think this is applicable if I have 3 GB RAM I won’t waste 6 GB of my hard disk as a swap that I’ll probably won’t need so I think that 512 MB-1 GB is enough.

In the ubuntu installer choose to install the boot loader to your entire hard disk so that the dual boot works

Auto mounting drives

In linux to access any hard disk drive you have to mount it first to some folder, it is the same in windows but the process is done under the hood, to auto mount your drives on start up, edit the /etc/fstab to add lines for your drives.

First you need to know the location of your drives, to do this open a terminal and type: df -h this will get you a list of your hard dist drives and the disk space usage of each, now this is the syntax to add a single drive to fstab file

/dev/sda1       /media/c        ntfs-3g default 0       0

Drive location, mount point the folder you want to mount your drive to, drive file system type ntfs-3g is used to access ntfs drives and make the drive read/write, other options leave them as default 0 0.

To edit the /etc/fstab file you must be root so assuming you’ll use a GUI text editor to edit the file, open a terminal (in Ubuntu 11.04 a shortcut for this is CTRL+ALT+T) and type:

gksudo gedit /etc/fstab

Type your password and you are ready to edit the file, you might want to take a copy of the file before editing incase something went wrong type: sudo cp /etc/fstab /etc/fstab.orig

Installing java

Software installation on linux might seem complex as you don’t have a .exe file to setup the program instead there’s something called package manager, this is a smart way to install software the package manager detect the dependencies for your software, installs them and configure your software so with typing only one command you can install the programs, it is something like installing an application on your iphone you just select the application and click install the operating system will download the app, install and configure it.

There’s something called Repositories in Linux, it is basically a place that contains the software you can find a repository for firefox, thunderbird, …etc, Ubuntu has some default repositories that contain a lot of software, Sun JDK is available in what’s called Canonical Partners repository in ubuntu this repository isn’t enabled by default to enable it: open synaptic package manager (in ubuntu 11.04 you can press the windows key then type synaptic and select synaptic package manager), go to Settings->Repositories->Other Software tab and select the checkbox of Canonical Partners, close the package manager.

Now open a terminal and type:

sudo apt-get update

sudo apt-get install sun-java6-jdk

Here you go JDK will be downloaded and installed

1. Delete the autorun.inf file from the root of the flash
2. Create an empty folder named autorun.inf on the root of the flash
3. This way the virus won’t be able to create an autorun.inf file as there’s an existing folder with the same name or edit the contents of it as it is a folder

After some searching I found out that the problem is related to using the same profiles of firefox 3 so in order to solve the problem:

1. start firefox with a new profile (fx4) for example, this can be done by running “firefox -p” and create a new profile

2. close firefox

3. copy the data (history, bookmarks, preferences, …) of the old profile to the new, on Windows platform run “%APPDATA%\Mozilla\Firefox\Profiles” copy all the files from your old profile (if you never used profile manager this would probably be the folder ending with .default) into the new one – the folder ending with .fx4

4. delete the old profile and start firefox

If you don’t know the location (host, port) of the Active Directory at your company AD Explorer will detect it on the network, just open the program and when you are prompted for the Active Directory Database don’t enter any thing and press OK, it will detect the Active directory (I think it will log you in with your username and password, probably you will have read right over the directory – it depends on the security applied at your company- and who knows you might have some write rights).

Now you can enjoy navigating the directory, it will probably contain some interesting information like who’s the manager of whom, who has got what laptop and what’s the specifications, you can find some blocked users, … etc.

1. Open IDE
2. Right click -> new -> Entity Bean
3. Select the table and proceed

Steps to create an entity bean in Jdeveloper 10.1.3

1. Open Jdeveloper
2. Right click -> new -> Entity Bean
3. Nothing happens, wait
4. Still nothing, go to the task manager to see the processing usage of the jdevw process
5. It’s 0%, wait again
6. Check your mail or read some blog post
7. Try to minimize and maximize the Jdeveloper, now you’ll get the usual grey blank space at the window
8. Try to close the Jdeveloper window, no reseponse
9. End the process of jdevw from the task manager
10. Open the Jdeveloper and try step 2
11. You’ll go through steps (3-9) again
12. Restart your machine
13. Try steps (1-2)
14. Select the table and proceed

The problem is that the embedded OC4J has a default implementation of JAXB 1 which varies big time from JAXB2 as the first version didn’t contain annotations. To use your JAXB2 libraries as a replacement to JAXB1 in OC4j 10 you have to make a shared library and attach it to your application on deployment, for embedded oc4j this process isn’t easy as it doesn’t have an interface to do this so you would have to manually edit some XML files to do this and some of those files may be overridden if the application is deployed automatically  that’s when you click run on a servlet, ejb , …etc. this link (http://buttso.blogspot.com/2007/09/using-jaxb-20-with-oc4j-1013x.html) shows how to add a shared library to your application in embedded oc4j (at the comments section).

JDeveloper comes with it’s own JDK  and the embedded OC4J uses this JDK, according to the application server specification the classes under java.* or javax.* will be looked up in the JDK (or JRE) first, if not found the application server will start looking up in the lib folder of your WEB-INF or in a shared library as OC4J. The JAXB2 implementation classes have the package of javax.* so simply if you want your embedded OC4J to use the JAXB2 implementation instead on JAXB1, put the jars of JAXB2 in the JRE of the JDeveloper you are using, this will be found under the directory:

<YOUR_PATH>\jdevstudio10133\jdk\jre\lib\ext

This solution is better in my opinion than adding a shared library to your embedded oc4j because why would I care to keep the implementation of JAXB1 – by adding a shared library I’m just overriding this implementation for this application – if I’m sure that I won’t be using it any more and If I have a new application that needs JAXB2 I would have to repeat the same steps for it.

Feel free to drop in a comment or e-mail me for any questions/ feedback.

The episode was about the snakes their living, habits, species ,… He mentioned that one of the types is called Python, the python programming language popped out at my mind at that moment and I thought that this is why Python got its name, later it turned out to be a wrong assumption,  and I decided to do a little research on how did the programming languages got their names and that’s what I reached, please If anyone knows extra info about those names or info about others share it with the public

Java

When SUN engineers first invented Java it was called “OAK” ( a tree), but the lawyers informed them that this name was taken to a company called OAK Technologies, so the held a long meeting ( some say it was about two meetings) to brainstorm for a new name, three major candidate names were Java, Silk and WebRunner, no one can say who exactly came out with the Java name.

References:

http://www.javaworld.com/javaworld/jw-10-1996/jw-10-javaname.html

C

C was called C as a lot of its features came from a predecessor language called B so the engineers at Bell Labs wanted to stick to the sequence (I read a post that says there was a language called A predecessor to B language)

References:

http://www.blurtit.com/q610744.html
http://en.wikipedia.org/wiki/C_(programming_language)

.Net

The name .Net is somehow a conventional name, it seems that Microsoft wanted to beat SUN in the field of programming to the web and networks after SUN released the Java (about 1995) and the big market share it got, so Microsoft decided to beat sun in this by releasing .Net (about 2002).

I read a very nice 2alsha about this ‘Microsoft choose .Net as .Com was already registered ”

References:

http://stackoverflow.com/questions/628145/why-was-net-called-net

http://en.wikipedia.org/wiki/.NET_Framework#Versions

Python

When the inventor of Python was developing it he needed some name to be short and unique for his new language, he was a fan of a British TV show called “Monty Python’s Flying Circus” so he picked Python as a name.

References:

http://www.python.org/doc/faq/general/#why-is-it-called-python

Oracle ( I know that this conflicts with the post title but as it seems that eventually all the technologies we’ll work with will be Oracle’s (Hope not) I decided to mention it)

The name Oracle comes from the code-name of a CIA-funded project Ellison(Oracle co-founder)  had worked on while previously employed by Ampex, I also read that oracle inn ancient greek or something meant the man that has the information and gives it whenever consulted

References:

http://w3schools.invisionzone.com/index.php?showtopic=18715

http://www.oracle.com/timeline/index.html

http://en.wikipedia.org/wiki/Oracle_Database

I will start – inshaallah – a series of posts explaining how to install, configure and use Oracle Access Manager till then I will be glad to answer any questions (If I knew the answer ) just leave a comment with your question and I will reply.

Checking swap space: 0 MB found (actual) 512 MB required

when i press (n) the installer exits.

After finally having some time at work to investigate that error, I found the following:

1. Swap space is the space used by the operating system to move pages from memory to, this space is on the hard drive and it’s like an extension for the RAM.

2.For windows XP the recommended setting is to let the windows manage the size of that space

3.When this option is selected Windows XP grows and shrinks the space according to the needs for an extended memory to the RAM

4.When the Oracle Installer starts it checks for the available swap space and unfortunately the machine at this time isn’t loaded with much programs so no swap space is used (that’s the 0 mb found)

To fix this problem set the swap size manually on windows by

1. Control Panel –> System –> Advanced –> Settings (under performance)  –> Advanced –> Change

2. set an initial size (2 mb) for example and a maximum one (1024 mb) for example, be sure that you have free space on your disk for the maximum size

3. press Set button and restart your machine