pefernan opened a new issue, #2339:
URL: https://github.com/apache/incubator-kie-issues/issues/2339
A _NullPointerException_ occurs in `JDBCProcessInstances.getUniqueEvents()`
when retriggering a `CallActivity` node that has `waitForCompletion="true"`
configured. The issue is caused by nested execution calls prematurely unloading
the parent process instance state.
The NPE occurs due to a state management issue when nested execution calls
happen on the same process instance. When retriggering a CallActivity node with
`waitForCompletion="true"`, the retrigger operation aborts the existing
subprocess, which in turn sends a signal back to the parent process. This
creates a nested call to `executeInWorkflowProcessInstanceWrite()` on the same
process instance while the outer retrigger call is still executing. The nested
call completes its execution and calls `internalUnloadProcessInstanceState()`,
which sets the processInstance field to null as part of its cleanup. When
control returns to the outer call, it attempts to persist the process instance
state via `syncPersistence()`, which calls `JDBCProcessInstances.update()`.
This method needs to access the process instance through `getUniqueEvents()` to
retrieve event types for persistence, but since the nested call already
unloaded the state, `internalGetProcessInstance()` returns null, causing the
NullPointerException.
NullPointerException is thrown:
```
java.lang.NullPointerException: Cannot invoke
"org.jbpm.workflow.instance.WorkflowProcessInstance.getEventTypes()" because
the return value of
"org.kie.kogito.process.impl.AbstractProcessInstance.internalGetProcessInstance()"
is null
at
org.kie.kogito.persistence.jdbc.JDBCProcessInstances.getUniqueEvents(JDBCProcessInstances.java:69)
at
org.kie.kogito.persistence.jdbc.JDBCProcessInstances.update(JDBCProcessInstances.java:88)
```
**How to Reproduce:**
- Create a process with a CallActivity node configured with
`waitForCompletion="true"`
- Start a process instance
- Use the Process Management API to retrigger the `CallActivity` node
instance:
`POST
/management/processes/{processId}/instances/{processInstanceId}/nodeInstances/{nodeInstanceId}`
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