iBatis plugin v0.9 not working with Idea 8618

When I install the iBatis plugin 0.9 on idea 8618 (Vista SP1, jdk 1.6u7), I get the following :

Implementing class
com.intellij.diagnostic.PluginException: Implementing class
at com.intellij.openapi.components.impl.ComponentManagerImpl$ComponentsRegistry.a(ComponentManagerImpl.java:7)
at com.intellij.openapi.components.impl.ComponentManagerImpl$ComponentsRegistry.a(ComponentManagerImpl.java:48)
at com.intellij.openapi.components.impl.ComponentManagerImpl$ComponentsRegistry.access$100(ComponentManagerImpl.java:67)
at com.intellij.openapi.components.impl.ComponentManagerImpl.a(ComponentManagerImpl.java:99)
at com.intellij.openapi.components.impl.ComponentManagerImpl.initComponents(ComponentManagerImpl.java:61)
at com.intellij.openapi.components.impl.stores.ApplicationStoreImpl.load(ApplicationStoreImpl.java:1)
at com.intellij.openapi.application.impl.ApplicationImpl.load(ApplicationImpl.java:144)
at com.intellij.idea.IdeaApplication.run(IdeaApplication.java:41)
at com.intellij.idea.MainImpl$3.run(MainImpl.java:1)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:597)
at com.intellij.ide.IdeEventQueue.c(IdeEventQueue.java:16)
at com.intellij.ide.IdeEventQueue.b(IdeEventQueue.java:207)
at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:112)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:273)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:183)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:173)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:168)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:160)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:121)
Caused by: java.lang.IncompatibleClassChangeError: Implementing class
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:620)
at java.lang.ClassLoader.defineClass(ClassLoader.java:465)
at com.intellij.util.lang.UrlClassLoader._defineClass(UrlClassLoader.java:119)
at com.intellij.util.lang.UrlClassLoader.defineClass(UrlClassLoader.java:115)
at com.intellij.util.lang.UrlClassLoader._findClass(UrlClassLoader.java:91)
at com.intellij.ide.plugins.cl.PluginClassLoader.loadClassInsideSelf(PluginClassLoader.java:77)
at com.intellij.ide.plugins.cl.PluginClassLoader.loadClass(PluginClassLoader.java:41)
at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
at java.lang.Class.$$YJP$$forName0(Native Method)
at java.lang.Class.forName0(Class.java)
at java.lang.Class.forName(Class.java:247)
at com.intellij.openapi.components.impl.ComponentManagerImpl$ComponentsRegistry.a(ComponentManagerImpl.java:11)
... 19 more



java.lang.IncompatibleClassChangeError: Implementing class
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:620)
at java.lang.ClassLoader.defineClass(ClassLoader.java:465)
at com.intellij.util.lang.UrlClassLoader._defineClass(UrlClassLoader.java:119)
at com.intellij.util.lang.UrlClassLoader.defineClass(UrlClassLoader.java:115)
at com.intellij.util.lang.UrlClassLoader._findClass(UrlClassLoader.java:91)
at com.intellij.ide.plugins.cl.PluginClassLoader.loadClassInsideSelf(PluginClassLoader.java:77)
at com.intellij.ide.plugins.cl.PluginClassLoader.loadClass(PluginClassLoader.java:41)
at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
at java.lang.Class.$$YJP$$forName0(Native Method)
at java.lang.Class.forName0(Class.java)
at java.lang.Class.forName(Class.java:247)
at com.intellij.openapi.components.impl.ComponentManagerImpl$ComponentsRegistry.a(ComponentManagerImpl.java:11)
at com.intellij.openapi.components.impl.ComponentManagerImpl$ComponentsRegistry.a(ComponentManagerImpl.java:48)
at com.intellij.openapi.components.impl.ComponentManagerImpl$ComponentsRegistry.access$100(ComponentManagerImpl.java:67)
at com.intellij.openapi.components.impl.ComponentManagerImpl.a(ComponentManagerImpl.java:99)
at com.intellij.openapi.components.impl.ComponentManagerImpl.initComponents(ComponentManagerImpl.java:61)
at com.intellij.openapi.components.impl.stores.ApplicationStoreImpl.load(ApplicationStoreImpl.java:1)
at com.intellij.openapi.application.impl.ApplicationImpl.load(ApplicationImpl.java:144)
at com.intellij.idea.IdeaApplication.run(IdeaApplication.java:41)
at com.intellij.idea.MainImpl$3.run(MainImpl.java:1)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:597)
at com.intellij.ide.IdeEventQueue.c(IdeEventQueue.java:16)
at com.intellij.ide.IdeEventQueue.b(IdeEventQueue.java:207)
at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:112)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:273)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:183)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:173)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:168)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:160)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:121)