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Prevent merge cell to split across pages

I have generated an Excel document with jxls and POI. Now POI has merged cell, half data is in page 1 & other half of merged cell in page 2. How can I prevent it?

Unfortunately you can't. That's a disadvantage of Excel. Excel does not provide a "keep merged cells on one page" feature. One need to set an explicit page break above of the row which shall the first on the new page.
Apache POI provides Sheet.setRowBreak to do so.
So you need to know what row is the first one having the merged cells split into two pages. Then set row break to the row above.
For example if first row index of the rows having the merged cells split into two pages is 25, then:
...
Sheet sheet ...
...
sheet.setRowBreak(24);
...
Of course this only can be used if the row positions on the page are static or if one knows how many rows fit to one page. I don't know any more dynamic solution.
Same is if merged columns split over two pages. Then manually set a column break is needed.
Apache POI provides Sheet.setColumnBreak to do so.
Of course this has same disadvantages as manually row break has.

Why does Apache POI read the row which has been manually erased?

I am trying to figure out why the row on excel gets uploaded which is manually erased(NOT Row delete from right click). Here is the scenario:
PS- I have a logic to trace the empty rows. If no of blank == myColumnCount, I skip the row. Somehow the blank count goes at least greater than 0. Hence gets uploaded
I enter the first row data
I enter the second row
I erase the cells manually of the second row
The data remains only on the first row
I save the file and upload it, POI reads the second row as empty row.
I understand the concept of Physical number of rows but confused as to why this scenario returns the row which has no data ?

Show pdf table header only for first table on a page

I have PDF document generated by iText in Java application, where I have a lot of tables with the same columns. In order to save some space in document I would like to have header only the first table on page. Any ideas? Thanks.

Reading Excel with some Borders missing

I am reading a .xslx file using Apache POI in Java.The last row in it is having some borders missing around some cells.
when I am reading this then in the last row after reading "abc"(written in first cell) ,am directly reading "rule1"(written in third cell) and second column is empty and bottom border is missing for it.
So the value of second cell which is empty cell is lost.So how can I be able to know that whether I have skipped any cell due to this formatting problem?

Use Cell.getColumnIndex() to retrieve the current cell's index. With this information you will be able to exactly get its position, and thus also find out whether there were any groups.

JTable Cell Data

I am facing a problem with JTable cell data in Java (Swing based application),
In each cell of JTable if I entered any data it is automatically appending to old data,
instead of that I want new data every time in that cell is just like Excel sheet Cell
(For example in Excel sheet when ever we want enter some data in a cell, at that moment old data of the cell is eraised and it allow new data ) my problem is simillar to that only
Advanced Thanks

From kleopatra's link, there is another link: http://tips4java.wordpress.com/2008/10/20/table-select-all-editor/
The code in there will select the content of the cell, you can modify the code to delete the contents instead of select.