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Calendar cal .... ..... cal.add(Calendar.DATE, 1);//increase one day

1. define the class extends to JRDefaultScriptlet public class ReportScriptlet extends net.sf.jasperreports.engine.JRDefaultScriptlet   // format of strDate: YYYY/MM/DD public static String getFormatedDate(String strDate,String outputFormat){ try {         // Some examples         SimpleDateFormat formatter = new SimpleDateFormat(INPUT_DATE_FORMAT);         Date date = (Date)formatter.parse(strDate.trim());         formatter.applyPattern(outputFormat);         String formatedDate = formatter.format(date);         System.out.println("formatedDate:" + formatedDate); return formatedDate;     }catch (Exception e) {           return strDate; // just don't format the String     } } 2. Added scriptletClass...

Date and time formats are specified by  date and time pattern  strings. Within date and time pattern strings, unquoted letters from  'A'  to  'Z'  and from  'a'  to  'z'  are interpreted as pattern letters representing the components of a date or time string. Text can be quoted using single quotes ( ' ) to avoid interpretation. "''"  represents a single quote. All other characters are not interpreted; they're simply copied into the output string during formatting or matched against the input string during parsing. The following pattern letters are defined (all other characters from  'A'  to  'Z'  and from  'a'  to  'z'  are reserved): Letter Date or Time Component Presentation Examples G Era designator Text AD y Year Year 1996 ;  96 M Month in year Month July ;  Jul ;  07 w Week in year Number 27 W Week in month Number 2 D Day in year Number 189 d Day in month Number ...

Very hot discussion about female and male in IT field My Experiences as a Female Software Engineer « Jean Hsu

first : update or create smb.conf under linux vim /etc/samba/smb.conf #============================ Share Definitions ============================== [homes]         comment = Home Directories         browseable = yes         writable = yes         path = /usr/local ;       valid users = %S ;       valid users = MYDOMAIN\%S [printers]         comment = All Printers         path = /var/spool/samba         browseable = no         guest ok = no         writable = no         printable = yes # ===== end ============= second:  add smb user: smbpasswd -a root third: restart smb service /etc/init.d/smb restart ...

YourKit Java Profiler is capable of measuring   shallow   and   retained   sizes of objects. Shallow size  of an object is the amount of memory allocated to store the object itself, not taking into account the referenced objects. Shallow size of a regular (non-array) object depends on the number and types of its fields. Shallow size of an array depends on the array length and the type of its elements (objects, primitive types). Shallow size of a set of objects represents the sum of shallow sizes of all objects in the set. Retained size  of an object is its shallow size plus the shallow sizes of the objects that are accessible, directly or indirectly,  only  from this object. In other words, the retained size represents the amount of memory that will be freed by the garbage collector when this object is collected. To better understand the notion of the  retained size , let us look at the following examples: In order to measure the reta...

Frequently Asked Questions about Garbage Collection in the Hotspot TM  Java TM  Virtual Machine This document describes the behavior of the Java( tm )  HotSpot ( tm ) virtual machine. This behavior is not part of the VM specification, however, and is subject to change in future releases. Moreover the  behavior  described here is generic behavior and will not apply to the execution of all Java applications. How is the generational collector implemented in HotSpot(tm)? The default collector in HotSpot has two generations: the young generation and the tenured generation. Most allocations are done in the young generation. The young generation is optimized for objects that have a short lifetime relative to the interval between collections. Objects that survive several collections in the young generation are moved to the tenured generation. The young generation is typically smaller and is collected more often. The tenured generation is typically larger ...

I still can not find the solution. So I summary all the things and tell my boss about it. If any one knows the solution, please let me know. Symptom: 1.        The JVM became Out of memory when creating big consumption report 2.        Those JRTemplateElement-instances is still there occupied even if I logged out the system Reason:         1. There is a large number of JRTemplateElement-instances cached in the memory 2.     The clearobjects() method in ReportThread class has not been triggered when logging out Action I tried:      About the Virtualizer: 1.     Replacing the JRSwapFileVirtualizer with JRFileVirtualizer 2.     Not use any FileVirtualizer for c...