OIM API - How to Read Child Form Data?

public void readChildFormData(long processInstanceKey) throws Exception{
String childTableName = "UD_LDAP_ROL"; //child table name
String childTableColumnName = "UD_LDAP_ROL_ROLE_NAME";//column name

tcFormInstanceOperationsIntf formInstanceOperationsIntf = Platform.getService(Thor.API.Operations.tcFormInstanceOperationsIntf.class);
 
long processFormDefinitionKey = formInstanceOperationsIntf.getProcessFormDefinitionKey(processInstanceKey);
int processParentFormVersion = formInstanceOperationsIntf.getActiveVersion(processFormDefinitionKey);
 
tcResultSet resultGetChildFormDefinition = formInstanceOperationsIntf.getChildFormDefinition(processFormDefinitionKey, processParentFormVersion);

for(int j = 0; j < resultGetChildFormDefinition.getRowCount(); j++){
resultGetChildFormDefinition.goToRow(j);
 
long childFormKey = resultGetChildFormDefinition.getLongValue("Structure Utility.Child Tables.Child Key");
int version = resultGetChildFormDefinition.getIntValue("Structure Utility.Child Tables.Child Version");
String childFrmName = resultGetChildFormDefinition.getStringValue("Structure Utility.Table Name");
 
System.out.println("**********************************");
System.out.println("Child Form Key :: " + childFormKey);
System.out.println("Child Form Name :: " + childFrmName);
System.out.println("Active Form Version :: " + version);
System.out.println("**********************************");
 
if(childFrmName.equalsIgnoreCase(childTableName)){
tcResultSet childData = formInstanceOperationsIntf.getProcessFormChildData(childFormKey, processInstanceKey);
 
for(int k = 0; k < childData.getRowCount(); k++){
childData.goToRow(k);
String value = childData.getStringValue(childTableColumnName);
System.out.println(value);
}
}
}
}