Scriptlets are sequences of Java code that are executed every time a report event occurs. Values of report variables can be affected through scriptlets.

A scriptlet is a java class, which must extend either of the following classes:

• net.sf.jasperreports.engine.JRAbstractScriptlet − This class contains a few abstract methods that must be overridden in every implementation. These methods are called automatically by JasperReports at the appropriate moment. The developer must implement all the abstract methods.
• net.sf.jasperreports.engine.JRDefaultScriptlet − This class contains default empty implementations of every method in JRAbstractScriptlet. A developer is only required to implement those methods depends upon the needs of their project.

The following table lists some of the methods in the above class. These methods will be called by the report engine at the appropriate time, during the report filling phase.

Method Description
public void beforeReportInit() Called before report initialization
public void afterReportInit() Called after report initialization.
public void beforePageInit() Called before each page is initialized.
public void afterPageInit() Called after each page is initialized.
public void beforeColumnInit() Called before each column is initialized.

Any number of scriptlets can be specified per report. If no scriptlet is specified for a report, the engine still creates a single JRDefaultScriptlet instance and registers it with the built-in REPORT_SCRIPTLET parameter.

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Method Description
public void beforeReportInit() Called before report initialization
public void afterReportInit() Called after report initialization.
public void beforePageInit() Called before each page is initialized.
public void afterPageInit() Called after each page is initialized.
public void beforeColumnInit() Called before each column is initialized.