Use lamda expression in .jrxml file for jasper report

[agna.desai]

I am trying to use lamda expression inside .jrxml file to get values for my field. I imported appropriate classes but it is giving me error that "p cannot be resolved to a variable". How to use a lamda expression inside jasper. Please help. I am using jasperreports 6.3.0.

 

 <jr:listContents height="20" width="400">

 <textFieldExpression>

 <![CDATA[stringUtils.join(((Collection<Property>)((Object2)$F{field1}.getPropertyValue("property1")).getPropertyValue("property2")).stream().map(p->((Object1)p.getValue()).getName()).collect(toList()),',');]]></textFieldExpression>

                    </textField>

                    </jr:listContents>

 

                </jr:list>

 

Exception

 

net.sf.jasperreports.engine.JRException: Errors were encountered when compiling report expressions class file:

 

1. p cannot be resolved to a variable

 

 

 

[hozawa]

I don't think lamba expression are supported inside jrxml. You'll have to use Scriplets.

[lucianc]

Lambda expressions in reports work with a recent JDT compiler jar (e.g. 4.5.1 from Maven http://search.maven.org/#search%7Cgav%7C1%7Cg%3A%22org.eclipse.jdt.core.compiler%22%20AND%20a%3A%22ecj%22) and with the following properties in jasperreports.properties:

org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.8

org.eclipse.jdt.core.compiler.compliance=1.8

org.eclipse.jdt.core.compiler.source=1.8

 

It also works with the 1.8 javac compiler used for reports, but using the JDT compiler is the recommended setup.

 

Regards,

Lucian