Unless I read the documentation wrong, I need to use JasperFillManager.fillReport to populate a jasper report. The field variables are noted as: $F{myVarName}
For instance. I have for this example 3 <textField> nodes in my jrxml
each text field contains a <textFieldExpression> node like this:
<textFieldExpression class="java.lang.String"><![CDATA[$F{param1}]]></textFieldExpression>
I've built a service that can generate pdf as base64 that I can inject where I need it. Here is an excerpt
PdfTemplate template = templateRepo.findByTemplateId(templateId)
JasperReport jasperReport = JasperCompileManager.compileReport(new ByteArrayInputStream(template.getTemplateXml().getBytes()))
JasperPrint jasperPrint = JasperFillManager.fillReport(jasperReport, parameters)
//JasperPrint jasperPrint = JasperFillManager.fillReport(jasperReport, parameters, new JREmptyDataSource) //Also tried this.
Parameters looks as follows:
Map<String, Object> parameters = new HashMap<>();
parameters.put("param1", "Value of param1");
parameters.put("param2", "Value of param2");
parameters.put("param3", "Value of param3");
//Where param1-3 correspond with $F{param1-3}
When the report is generated, I only see nulls.
ie:
Parameter 1: null
Parameter 2: null
Parameter 3: null
Any help to get those parameter values to pull to the report will be appreciated.
Reference Notes:
In Jasper Reports, $F{} is for a field, not for a parameter. Change your expression to $P{}
Also, make sure the parameter is defined in the JRXML.
So you textFieldExpression should be as below.
<textFieldExpression class="java.lang.String"><![CDATA[$P{param1}]]></textFieldExpression>