omarmahamid opened a new issue, #6407:
URL: https://github.com/apache/incubator-kie-drools/issues/6407
I'm encountering a null value when working with a serialized and then
deserialized KieBase, particularly during the package merge phase.
During the merge process, existing rules from the "old" package are removed
**BEFORE** new rules are added. In this removal phase, the engine evaluates
terminal node associations using:
````
sinkNotExclusivelyAssociatedWithTerminal
````
This method internally relies on AbstractTerminalNode#isTerminalNodeOf,
which iterates over pathEndNodes:
```java
public final boolean isTerminalNodeOf(LeftTupleNode node) {
for (PathEndNode pathEndNode : getPathEndNodes()) {
if (pathEndNode.hasPathNode(node)) {
return true;
}
}
return false;
}
```
Problem:
pathEndNodes is defined as:
````java
private transient PathEndNode[] pathEndNodes;
````
Since it's transient, it is not restored during deserialization, and it is
typically re-initialized during ReteooBuilder#addRule. However, at the time of
rule removal, this initialization hasn’t occurred yet — meaning
getPathEndNodes() returns null, leading to a NullPointerException inside the
for loop.
## Question:
Is this behavior expected?
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