clear positions cache on hotswap

java/debugger/impl/src/com/intellij/debugger/engine/CompoundPositionManager.java

@@ -54,6 +54,10 @@ public class CompoundPositionManager extends PositionManagerEx implements MultiR
   public void appendPositionManager(PositionManager manager) {
     myPositionManagers.remove(manager);
     myPositionManagers.add(0, manager);
+    clearCache();
+  }
+
+  public void clearCache() {
     mySourcePositionCache.clear();
   }
 

java/debugger/impl/src/com/intellij/debugger/impl/ReloadClassesWorker.java

@@ -168,6 +168,8 @@ class ReloadClassesWorker {
       processException(e);
     }
 
+    debugProcess.getPositionManager().clearCache();
+
     DebuggerContextImpl context = myDebuggerSession.getContextManager().getContext();
     SuspendContextImpl suspendContext = context.getSuspendContext();
     if (suspendContext != null) {