java.lang.NoClassDefFoundError: com/xxx/xxx/xxx/xxx/response/Rpc/InitializeRpcResponse$Initialize$Capabilities
	at com.alibaba.fastjson2.reader.ORG_2_2_Capabilities.createInstance(Unknown Source)
	at com.alibaba.fastjson2.reader.ObjectReaderAdapter.createInstance(ObjectReaderAdapter.java:606)
	at com.alibaba.fastjson2.reader.ObjectReaderAdapter.createInstance(ObjectReaderAdapter.java:635)
	at com.alibaba.fastjson2.JSONObject.to(JSONObject.java:1245)
	at com.alibaba.fastjson2.JSONObject.toJavaObject(JSONObject.java:1255)
	at com.xxx.xxx.xxx.xxx.response.Rpc.InitializeRpcResponse.getInitialize(InitializeRpcResponse.java:26)
	at com.xxx.xxx.xxx.xxx.response.Rpc.InitializeRpcResponse.<init>(InitializeRpcResponse.java:20)
	at com.xxx.xxx.xxx.xxx.LspService.handleResponses(LspService.java:748)
	at com.xxx.xxx.xxx.xxx.JsonRpcUtils.decode(JsonRpcUtils.java:111)
	at com.xxx.xxx.xxx.xxx.LspService.handleLspData(LspService.java:1364)
	at com.xxx.xxx.xxx.xxx.LspService$3.onTextAvailable(LspService.java:1125)
	at com.intellij.execution.process.ProcessHandler$2.onTextAvailable(ProcessHandler.java:289)
	at com.intellij.execution.process.ProcessHandler.notifyTextAvailable(ProcessHandler.java:220)
	at com.intellij.execution.process.BaseOSProcessHandler$SimpleOutputReader.onTextAvailable(BaseOSProcessHandler.java:133)
	at com.intellij.util.io.BaseOutputReader.processInput(BaseOutputReader.java:213)
	at com.intellij.util.io.BaseOutputReader.readAvailableBlocking(BaseOutputReader.java:151)
	at com.intellij.util.io.BaseDataReader.readAvailable(BaseDataReader.java:72)
	at com.intellij.util.io.BaseDataReader.doRun(BaseDataReader.java:153)
	at com.intellij.util.ConcurrencyUtil.runUnderThreadName(ConcurrencyUtil.java:218)
	at com.intellij.util.io.BaseDataReader.lambda$start$0(BaseDataReader.java:48)
	at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:539)
	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
	at java.base/java.util.concurrent.Executors$PrivilegedThreadFactory$1$1.run(Executors.java:702)
	at java.base/java.util.concurrent.Executors$PrivilegedThreadFactory$1$1.run(Executors.java:699)
	at java.base/java.security.AccessController.doPrivileged(AccessController.java:399)
	at java.base/java.util.concurrent.Executors$PrivilegedThreadFactory$1.run(Executors.java:699)
	at java.base/java.lang.Thread.run(Thread.java:840)
Caused by: java.lang.ClassNotFoundException: com.xxx.xxx.xxx.xxx.xxx.xxx.InitializeRpcResponse$Initialize$Capabilities
	at java.base/java.lang.ClassLoader.findClass(ClassLoader.java:723)
	at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:592)
	at com.alibaba.fastjson2.util.DynamicClassLoader.loadClass(DynamicClassLoader.java:190)
	at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:525)
	... 29 more

ClassLoader oldClassLoader = Thread.currentThread().getContextClassloader();
try {
    Thread.currentThread().setContextClassLoader(User.class.getClassLoader());
    User user = Json.to(User.class, jsonStr);
} finally {
    Thread.currentThread().setContextClassLoader(oldClassLoader);
}