This script aims to avoid patching the bug happening in Liferay 6.2 CE ga2 where Structure Ids weren't exposed, even when disabling the autogeneration of Ids. It can be run through the scripting console in the Control Panel. To understand the issue, visit: https://issues.liferay.com/browse/LPS-48441.

structureIdWorkAround.groovy

import com.liferay.portlet.journal.service.JournalStructureLocalServiceUtil;
import com.liferay.portlet.journal.model.JournalStructure;

List<JournalStructure> lista = JournalStructureLocalServiceUtil.getStructures();
println(lista);
JournalStructure myStructure = JournalStructureLocalServiceUtil.getStructure(10903); 
// hard coded id of the structure that you want, mine was 10903
println(myStructure);
myStructure.setStructureId("MY_STRUCTURE_ID");
println(myStructure);
JournalStructureLocalServiceUtil.updateJournalStructure(myStructure); 
// this call updates the structure in the database
JournalStructure structureChanged = JournalStructureLocalServiceUtil.getStructure(10181,"REMEMBER_ME_TERMS"); 
// 10181 is the site id of the structure
println(structureChanged);