MaxKless
53c0123bef
## Current Behavior The Maven batch runner uses a parallel thread pool to execute tasks. When multiple tasks are independent roots in the task graph, they get picked up by separate threads simultaneously. Both threads call `invoke()` on the same shared `CachingResidentMavenInvoker` (Maven 4) or `CachingMaven3Invoker` (Maven 3) instance concurrently. Maven 4's `LookupInvoker.invoke()` is not thread-safe — it snapshots/restores `System.getProperties()` and the thread context classloader in a `finally` block, and all concurrent invocations share the same resident `MavenContext`. This can cause deadlocks in Maven's internal session machinery. ## Expected Behavior Maven executions through the shared invoker are serialized via `@Synchronized`, preventing concurrent access to non-thread-safe Maven internals. The parallel thread pool still handles task graph management, build state recording, and result emission concurrently. Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
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