2012/01/18

4 tips to improve performance of Java application with database

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Java database performance tips 1: Find out  how many database calls  you are making and minimize those believe it or not if you see perf...
2012/01/17

Java Comparator Example

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If you have a List of the employee objects then you need to use Collections.sort() method to sort the list holding employee objects. Below ...
2012/01/15

5 Skills for Tech Leads

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1) Development You should be a developer, and a good one. 2) Release Management Your main job is to resolve needs and roadblock...
2012/01/13

How Larry Page Changed Meetings At Google After Taking Over Last Spring

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Every meeting must have one clear decision maker. If there's no decision maker -- or no decision to be made -- the meeting shouldn...
2012/01/12

iReport 直式/橫式報表

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需求 根據User所選擇要輸出橫式或直式的格式，分別輸出符合指定格式的報表 若user選擇列印格式為橫式 就輸出橫式報表 若user選擇列印格式為直式 就輸出直式報表 作法 - 橫式報表 由於iReport建立template後，...

Winners and Losers in Business Open-Source Software

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Application Server/Web Server: Trending Up: Node.js and NGINX Trending Level: Tomcat and Apache HTTP Server Trending Down: JBoss and G...
2012/01/08

How to create barcode in iReport

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Here is a simple example to create barcode in iReport Scenario 1. As user click "Preview" in iReport, it will show dialog to in...
2012/01/03

IO Error: Size Data Unit (SDU) mismatch:oracle.net.ns.NetException: Size Data Unit (SDU) mismatch

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Problem As I would like to do query via JPA, I got this error message IO Error: Size Data Unit (SDU) mismatch:oracle.net.ns.NetException:...
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2011/12/31

11 Things every Software Developer should be doing in 2012

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1. Get on Twitter 2. Read StackOverflow Daily 3. Start a Blog 4. Get out there 5. Carry around a modern phone 6. Embrace Mob...
2011/12/30

Preventative medicine for Memory leaks in Java

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How to avoid memory leaks?     To avoid memory leaks, We must check our applications to make sure the below: Our app ought to release...
2011/12/29

Improve Software Quality with Tools and Processes

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Choose a suitable process model and apply it correctly, ex. agile ,  scrum ,  iterative and incremental Control the version of each req...
2011/12/28

善用Oracle提供的function來提升系統效能

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有關報表的日期欄位，資料庫是儲存成yyyMMDD or yyyMM。 根據現有需求，需formatting成 YYY/MM或者是YYY/MM/DD格式， 因為效能考量，此類的formatting應 在SQL裡頭做 ，不要放到AP level做。 舉個例子來說 ...
2011/12/22

Are You Making These 7 Productivity Mistakes?

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Mistake #1: Cutting Back on Sleep Mistake #2: Multi-Tasking Mistake #3: Doing Everything Yourself Mistake #4: Focusing Solely on Numbe...

No output specified for the exporter

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Problem As I would like to export pdf via JasperReports JRExporter, it throw " No output specified for the exporter " exception. ...

How to apply 1000 separator in data field

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需求 在數字或者是金額等欄位，需要做到千分位隔開，如1000，要顯示1,000 作法 1. 到特定欄位按右鍵，選擇Field Pattern 2. 選擇Number, 將"User 1000 Separator"打勾，再按Apply ...

REPORT_COUNT vs. [group name]_COUNT

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需求 在產出的報表的每筆資料的第一個column，指定序號 產出結果如下 一般來說，只要將REPORT_COUNT此欄位拉到iReport即可 但是在NIG071此張報表中，若到下一頁，他會把值reset，從1開始 會造成此問題的原因，是因為此報表有用到 ...