src/main/java/org/efaps/ui/wicket/EFapsSession.java
public synchronized void  pruneFinishedTasks()
    {
        final ArrayList<IExecutionBridge> nonFinishedBridges = new ArrayList<>();
        for (final IExecutionBridge bridge: this.executionBridges) {
            if (!bridge.isFinished()) {
                nonFinishedBridges.add(bridge);
            }
        }
        this.executionBridges = nonFinishedBridges;
    }
public synchronized void  pruneFinishedTasks()
    {
        final ArrayList<IExecutionBridge> nonFinishedBridges = new ArrayList<>();
        for (final IExecutionBridge bridge: this.executionBridges) {
            if (!bridge.isFinished()) {
                nonFinishedBridges.add(bridge);
            }
        }
        this.executionBridges = nonFinishedBridges;
    }
Prune finished tasks.