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java.lang.IllegalArgumentException: Cannot initialize plugin 'org.hotswap.agent.plugin.hotswapper.HotswapperPlugin', appClassLoader is null.	at org.hotswap.agent.config.PluginRegistry.initializePlugin(PluginRegistry.java:137)	at org.hotswap.agent.util.PluginManagerInvoker.callInitializePlugin(PluginManagerInvoker.java:26)	at org.hotswap.agent.plugin.hotswapper.HotswapperPlugin.init(HotswapperPlugin.java:127)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:606)	at org.hotswap.agent.annotation.handler.InitHandler.invokeInitMethod(InitHandler.java:86)	at org.hotswap.agent.annotation.handler.InitHandler.access$100(InitHandler.java:28)	at org.hotswap.agent.annotation.handler.InitHandler$1.onInit(InitHandler.java:110)	at org.hotswap.agent.config.PluginManager.initClassLoader(PluginManager.java:175)	at org.hotswap.agent.util.HotswapTransformer.ensureClassLoaderInitialized(HotswapTransformer.java:170)	at org.hotswap.agent.util.HotswapTransformer.transform(HotswapTransformer.java:129)	at sun.instrument.TransformerManager.transform(TransformerManager.java:188)	at sun.instrument.InstrumentationImpl.transform(InstrumentationImpl.java:424)