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# Use a Java report postprocessor

This topic introduces how to use a Java report postprocessor to generate Excel reports.

In this topic:

## What is a Java report postprocessor

A Java report postprocessor is a java class that runs right after the Excel template is filled with data. It enables you to use the Apache POI XSSF API to edit the XLSX file, such as modify charts and add pictures.

You can retrieve all the data available to the report from the Java code, and add more data that will be available to the Java report streaming class. You can also use the same database-related tools as in the Java preprocessor class.

## When to use Java report postprocessor

A Java report postprocessor can be used when complex operations are required on the XLSX file, and when adding these operations as script in the template presents a maintenance challenge.

However, a Java report postprocessor is not necessary if you use the large data mode to just insert large amounts of data in the document, as the report postprocessor requires loading the whole document to memory for processing.

## How to use Java report postprocessor

Follow the steps below to use a Java report postprocessor to generate Excel reports.

### Create a report type

In the report type�s command steps, anywhere between the first line `ksc_run_excel_report` and the last line `ksc_end_report_parameters`, add the `REPORT_POSTPROCESSOR_CLASS` parameter. Set the parameter value to the fully qualified class name of your Postprocessor class. For example, for the class `com.hpe.ppm.excelreports.SamplePostProcessorClass` that you can find in the attached bundle in the folder `6 - Using a Java report post-processor`, the line would be:

`REPORT_POSTPROCESSOR_CLASS=com.hpe.ppm.excelreports.SamplePostProcessorClass`

### Create a Java report postprocessor class

You should create a Java class that extends the existing abstract class `com.mercury.itg.common.excel.exporter.data.ExcelReportWorkbookPostprocessor`. The single method to implement is: `public void processWorkbook(XSSFWorkbook wb)`

You can then directly work on the passed XSSF workbook object to modify the report XLSX document.

For more information, see the sample postprocessor class `SamplePostProcessorClass.java` located in the attached bundle (in the path `6 - Using a Java report post-processor\1 - Sample Report PostProcessor source code\com\hpe\ppm\excelreports` ).

### Deploy the Java report postprocessor class

Deploy the Java Report Postprocessor class in the same way as you deploy a Preprocessor class. See Deploy the Java preprocessor class.

### Create the Excel template

There is nothing special to do on the excel template if you use a Java Report Postprocessor. The only limitation is that you cannot fill the template using the large data mode.

### Example of report using a Postprocessor

You can find an example of an Excel template and the resulting report in the `Samples\6 - Using a Java report post-processor` file. The source code and a jar version of the Java Postprocessor are included.

## See also

- Use a Java report streaming class
- Use a Java preprocessor

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