NullPointerException on second consecutive declared type update --------------------------------------------------------------- Key: DROOLS-5687 URL: https://issues.redhat.com/browse/DROOLS-5687 Project: Drools Issue Type: Bug Components: core engine Affects Versions: 7.43.0.Final Reporter: Matteo Casalino Assignee: Mario Fusco Priority: Major Attachments: npe-consecutives-declare-update.zip When updating a {{KieContainer}} with {{updateToVersion}} with a change in a declared type two consecutive times, a {{NullPointerException}} is raised. Minimal example DRL triggering the issue (notice at least two declared types are needed): {noformat} declare FactType1 x : int end declare FactType2 y : int end {noformat} first update: {noformat} declare FactType1 x : int z : int end declare FactType2 y : int end {noformat} second update: {noformat} declare FactType1 x : int z : int w : int end declare FactType2 y : int end {noformat} The second update will raise the following exception: {noformat} java.lang.NullPointerException at org.drools.compiler.kie.util.ChangeSetBuilder.build(ChangeSetBuilder.java:106) at org.drools.compiler.kie.builder.impl.InternalKieModule.getChanges(InternalKieModule.java:132) at org.drools.compiler.kie.builder.impl.KieContainerImpl.update(KieContainerImpl.java:241) at org.drools.compiler.kie.builder.impl.KieContainerImpl.update(KieContainerImpl.java:237) at org.drools.compiler.kie.builder.impl.KieContainerImpl.updateToVersion(KieContainerImpl.java:195) at org.example.reproducer.KjarUpdateTest.update(KjarUpdateTest.java:37) at org.example.reproducer.KjarUpdateTest.testConsecutiveUpdates(KjarUpdateTest.java:48) {noformat}