Q:

How to add multiple columnProperties (fields) to ColumnBuilder? 

I am using the below code to display the column properties in jasper report.  But I am not able to get the three properties values to single column.  Is there any possibility to get three of the properties to display using "," in a single column. 
The file contains the below code:
DynamicReportBuilder drb = new DynamicReportBuilder();
drb.setTitle("Transaction List Export")
                .setSubtitle("This report was generated at " + new Date())
                .setDetailHeight(15)                    // defines the height for each record of the report
                .setPrintColumnNames(true)
                .setIgnorePagination(true)              // for Excel, we may don't want pagination, just a plain list
                .setMargins(30, 20, 0, 15)              // define the margin space for each side (top, bottom, left and right)
                .setDefaultStyles(titleStyle, subtitleStyle, headerStyle, detailStyle)
                .setColumnsPerPage(1, 10)
                .setUseFullPageWidth(true)              // we tell the report to use the full width of the page.  this resizes
                                                        // the columns width proportionally to meat the page width. 
                .setAllowDetailSplit(false)
                .setReportName("Client List");
AbstractColumn columnClientLocation = ColumnBuilder.getNew()
                .setColumnProperty("ClientAddress", String.class.getName()+Constants. COMMA)
               .setColumnProperty("ClientCity",String.class.getName()+Constants. COMMA)
                setColumnProperty("ClientPostalCode",String.class.getName())
                .setTitle(messages.getMessage(locale, "group.terminalinfo"))
                .setWidth(80)
                .build();
                width = width + 80;

            /**
             * We add the columns to the report (through the builder) in the
             * order we want them to appear
             */
            if(myContainer.getServiceProvider().equalsIgnoreCase("GOOG")) {
                drb.addColumn(columnTransactionActivity)
                    .addColumn(columnClientLocation);
            }

I am unable to get the values of ClientAddress,ClientCity and ClientPostalCode in a single column of jasper report . 
I would like to display all these three properties in a single column. 

A:

You can not use "," you need to use CustomExpression to achieve desired result
Example
First add your fields to report, so they can be accessed
drb.addField("ClientAddress", String.class.getName());
drb.addField("ClientCity", String.class.getName());
drb.addField("ClientPostalCode", String.class.getName());

Then create the AbstractColumn with a CustomExpression
AbstractColumn columnClientLocation = ColumnBuilder.getNew().setCustomExpression(
    return new CustomExpression() {
        public Object evaluate(Map fields, Map variables, Map parameters) {
            String clientAddress = (String) fields.get("ClientAddress");
            String clientCity = (String) fields.get("ClientCity");
            String clientPostalCode = (String) fields.get("ClientPostalCode");
            return clientAddress + ", " + clientCity + ", " + clientPostalCode;
        }

        public String getClassName() {
            return String.class.getName();
        }
    }
).build();

