While testing automated strategy, I got this error message:

java.lang.ArrayIndexOutOfBoundsException: 7315 >= 7315
at java.util.Vector.elementAt(Vector.java:427)
at javax.swing.tree.DefaultMutableTreeNode.getChildAt(DefaultMutableTreeNode.java:230)
at javax.swing.tree.VariableHeightLayoutCache.treeNodesRemoved(VariableHeightLayoutCache.java:543)
at javax.swing.plaf.basic.BasicTreeUI$Handler.treeNodesRemoved(BasicTreeUI.java:3810)
at javax.swing.tree.DefaultTreeModel.fireTreeNodesRemoved(DefaultTreeModel.java:530)
at javax.swing.tree.DefaultTreeModel.nodesWereRemoved(DefaultTreeModel.java:310)
at javax.swing.tree.DefaultTreeModel.removeNodeFromParent(DefaultTreeModel.java:244)
at com.dukascopy.dds2.greed.gui.component.tree.o.b(Unknown Source)
at com.dukascopy.dds2.greed.gui.component.chart.listeners.e.Y(Unknown Source)
at com.dukascopy.charts.b.b.Y(Unknown Source)
at com.dukascopy.charts.drawings.q.Y(Unknown Source)
at com.dukascopy.charts.drawings.j.gt(Unknown Source)
at com.dukascopy.charts.drawings.q.gt(Unknown Source)
at com.dukascopy.charts.chartbuilder.r.removeAll(Unknown Source)
at com.dukascopy.charts.d.b.removeAll(Unknown Source)
at meridian.Pair.onBar(Pair.java:108)
at meridian.EmCee.onBar(EmCee.java:31)
at com.dukascopy.dds2.greed.agent.strategy.tester.b.a(Unknown Source)
at com.dukascopy.dds2.greed.agent.strategy.tester.r.run(Unknown Source)
at com.dukascopy.dds2.greed.agent.strategy.tester.b.Bb(Unknown Source)
at com.dukascopy.dds2.greed.actions.StrategyTesterAction.yV(Unknown Source)
at com.dukascopy.dds2.greed.actions.StrategyTesterAction.yu(Unknown Source)
at com.dukascopy.dds2.greed.actions.c.run(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:680)

It seems that it happened during chart cleanup in removeAll().

After some more troubleshooting, I found out that removeAll() doesn't work correctly when test speed is set to 8x. In my strategy, I'm refreshing the chart after every bar (removeAll() and then draw latest chart objects). When running on test speed 7x, removeAll() worked correctly, and old objects were removed after every bar, on 8x they were still part of chart, even if not displayed.

I'm attaching a screenshot, where the same strategy was run on the same data on test speed 7x and 8x. You can see in Workspace, that on first run I have only 4 rectangles (as in chart), and on second run many of them, even only 4 are visible in chart.