I encountered the following error when I tried ESC/JAVA 2 on open-jdk 1.6. Using Sun JDK 1.6 also caused the same error.

/usr/java/jre1.6.0_18/lib/rt.jar:java/io/PrintStream.class:  Error: Different or incompatible return types on overridden(hidden) and  overriding(hiding) methods

Then I uninstalled JDK 1.6 and then installed Sun JDK 1.5, and it works like a charm This is because ESC/JAVA 2 uses JML specification of JDK 1.4. Hence it may cause trouble in case of higher versions of JDK.

Download JDK 1.5 for Linux from here or Direct Link

Reference : Issues of ESC/JAVA 2 with JDK 1.6

Do Pdf is a useful tool I have found for converting any type of document which is printable into a PDF. It is fairly light weight converter and output file size is considerably reduced with quality remaining mostly intact.

It nicely integrates as a virtual printer driver, so you just need to click print of the file and select DoPdf instead of regular printer. You can also select several images at once and click on print to create single PDF from the images. This would be useful when merging a scanned text book images into a PDF.

Website: http://www.dopdf.com/

Installing Application Express with Oracle 10g Express Edition on Ubuntu is as easy as installing on Windows.

I have comprehended the steps to install Oracle Express Edition along with APEX 3.2 in Ubuntu.

UPDATE: The same procedure works for upgrading to APEX 4.0 from APEX 3.2 or directly installing 4.0 over Oracle XE as well.

1) Download Oracle XE universal .deb file from oracle.com

Download apex_3.2.zip from oracle.com

2)  Double click the .deb file and install the package.

then in Terminal window type:
Type:

 sudo /etc/init.d/oracle-xe configure 

Follow the instructions given there to complete the installation of Oracle 10g.

3) Setting the Oracle Path:
Edit your .bashrc file to include the lines:

ORACLE_HOME=/usr/lib/oracle/xe/app/oracle/product/10.2.0/server
PATH=$PATH:$ORACLE_HOME/bin
export ORACLE_HOME
export ORACLE_SID=XE

export PATH

4) UPGRADING TO APEX 3.2
Place apex_3.2.zip in folder /tmp.
In terminal:

cd /tmp
unzip apex_3.2.zip
cd /tmp/apex
sqlplus /nolog 

Type:

connect sys as sysdba

Note: Prompt for password of database admin login
Type:

 @apexins SYSAUX SYSAUX TEMP /i/ 

This will take several minutes for installation.

5) Setting the Images folder
In terminal Type inside /tmp/apex directory:

sqlplus /nolog

In sqlplus:

connect sys as sysdba
@apxldimg.sql /tmp

6) Enable remote http connections:

SQL>

 exec dbms_xdb.setListenerLocalAccess (l_access => FALSE);

Login

URL: http://127.0.0.1:8080/apex

Workspace: Internal

Username: Admin

Password: password

Source:

http://ubuntuforums.org/showthread.php?t=899926

https://help.ubuntu.com/community/Oracle10g

and Apex Documentation

    Here is a simple code for reading the entire contents of a file into a string in PL/SQL using utl_file package.
It iterates through the file, concatenating each line at a time using get_line function.
declare
  f_in utl_file.file_type;
  s_in varchar2(10000);
  string varchar2(32000);

begin
 f_in := utl_file.fopen('SAMPLEDIR','input.txt','R');

   loop
      begin
        utl_file.get_line(f_in,s_in);
        EXCEPTION
          WHEN NO_DATA_FOUND THEN
        EXIT;

        string:= string || s_in;

      end;
   end loop;
 utl_file.fclose(f_in);
end;

 In the above code SAMPLEDIR is a logical entry in the database pointing to a directory which needs to be created before performing any file handling procedures. The following link lets you get started with file handling in PL/SQL in case if you are new to it. http://www.devshed.com/c/a/Oracle/Reading-Text-Files-using-Oracle-PLSQL-and-UTLFILE/1/

Developed by me in Java using Swings
Features: Platform independent (Needs Java Runtime environment)
Can open pictures in a folder
Zoom in and zoom out
Goto a picture in a folder

• Needs Java Runtime environment to run.
• To Download the Picture-viewer Jar file click here

Hi all ,  posting this one after really long time. Blogging is not easy. I wonder how those bloggin freaks have something to jot down even from  nothing! Neverthless I will try to be active over this blog and post personal stuff along with technical. As u can see no more words to pen down now…………

Ubuntu 9.10 is finally out

and the .iso file can be downloaded here from the web
You can Request  for a free cd here (www.shipit.ubuntu.com)

For IIT Guwahati’s Intranet – Click here

Don’t forget to bypass the proxy before downloding)

Installing:

1) You can directly burn the .iso image onto a CD and then insert the CD for installation.
2) If you  are a windows user (Not having ubuntu at all),  then you can save the  cost of a CD by
»mounting the .iso image by using daemon tools or related software and then in the auto-run window,
»choose  “Install inside windows” – Preferably select a hard drive not having windows
»Then Install and reboot – your Ubuntu 9.10 will be installed in minutes

Note: Installing inside windows – All your harddisk information is retained -

-No formatting

In Unix based Systems:

system("clear");

Or for that matter any unix command can be executed in this manner

system("cat myfile.txt");

On a Windows based System

system("cls");

Hi all,

This is my first post on my blog
this blog will be a mixture of my experiences and findings