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import java.util.HashMap;
import java.util.Map;
import org.joget.apps.app.model.AppDefinition;
import org.joget.apps.app.service.AppService;
import org.joget.apps.app.service.AppUtil;
import org.joget.apps.form.model.FormRow;
import org.joget.apps.form.model.FormRowSet;
import org.joget.apps.form.service.FormUtil;
import org.joget.workflow.model.WorkflowAssignment;
import org.joget.workflow.util.WorkflowUtil;

//Constant variable
String formDefId = "approvalForm";

//Service bean
AppService appService = (AppService) pluginManagerAppUtil.getApplicationContext().getBean("appService");

//Get primary key
String id = appService.getOriginProcessId(workflowAssignment.getProcessId());

//Get existing data
FormRowSet rowSet = appService.loadFormData(appDef.getAppId(), appDef.getVersion().toString(), formDefId, id);
FormRow row = null;
if (rowSet == null || rowSet.isEmpty()) {
    rowSet = new FormRowSet();
    row = new FormRow();
    row.setId(id);
    rowSet.add(row);
} else {
    row = rowSet.get(0);
}

//Set values
row.setProperty("field1", "value 1");
row.setProperty("field2", "value 2");
row.setProperty("field3", "value 3");

//Save
appService.storeFormData(appDef.getAppId(), appDef.getVersion().toString(), formDefId, rowSet, id);