urlyy opened a new issue, #2684: URL: https://github.com/apache/fory/issues/2684
### Search before asking - [x] I had searched in the [issues](https://github.com/apache/fory/issues) and found no similar issues. ### Version Latest ### Component(s) Java ### Minimal reproduce step ```java private static class ComplexObject1Serializer extends Serializer<ComplexObject1> { public ComplexObject1Serializer(Fory fory, Class<ComplexObject1> cls) { super(fory, cls); } @Override public void write(MemoryBuffer buffer, ComplexObject1 value) { xwrite(buffer, value); } @Override public ComplexObject1 read(MemoryBuffer buffer) { return xread(buffer); } @Override public void xwrite(MemoryBuffer buffer, ComplexObject1 value) { fory.xwriteRef(buffer, value.f2); } @SuppressWarnings("unchecked") @Override public ComplexObject1 xread(MemoryBuffer buffer) { ComplexObject1 obj = new ComplexObject1(); fory.getRefResolver().reference(obj); obj.f2 = (String) fory.xreadRef(buffer); return obj; } } public static class ComplexObject1 { String f2; public ComplexObject1() { this.f2 = "hello"; } } public static class Outer { ComplexObject1 f1; public Outer(ComplexObject1 f1) { this.f1 = f1; } } public static class Outer2 { } @Test public void testRegisterSerializer() throws Exception { Fory fory = Fory.builder() .withLanguage(Language.XLANG) .withCompatibleMode(CompatibleMode.COMPATIBLE) .requireClassRegistration(false) .build(); Fory fory2 = Fory.builder() .withLanguage(Language.XLANG) .withCompatibleMode(CompatibleMode.COMPATIBLE) .requireClassRegistration(false) .build(); fory.register(ComplexObject1.class, "test.ComplexObject1"); fory.registerSerializer(ComplexObject1.class, ComplexObject1Serializer.class); fory.register(Outer.class, "test.outer"); Outer outer = new Outer(new ComplexObject1()); byte[] serialized = fory.serialize(outer); fory2.register(Outer2.class, "test.outer"); Outer2 outer2 = (Outer2) fory2.deserialize(serialized); System.out.println(outer2); } ``` ### What did you expect to see? pass test ### What did you see instead? ``` org.apache.fory.exception.DeserializationException: Failed to deserialize input at org.apache.fory.util.ExceptionUtils.handleReadFailed(ExceptionUtils.java:66) at org.apache.fory.Fory.deserialize(Fory.java:886) at org.apache.fory.Fory.deserialize(Fory.java:782) at org.apache.fory.RustXlangTest.testRegisterSerializer(RustXlangTest.java:170) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.testng.internal.invokers.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:136) at org.testng.internal.invokers.TestInvoker.invokeMethod(TestInvoker.java:658) at org.testng.internal.invokers.TestInvoker.invokeTestMethod(TestInvoker.java:219) at org.testng.internal.invokers.MethodRunner.runInSequence(MethodRunner.java:50) at org.testng.internal.invokers.TestInvoker$MethodInvocationAgent.invoke(TestInvoker.java:923) at org.testng.internal.invokers.TestInvoker.invokeTestMethods(TestInvoker.java:192) at org.testng.internal.invokers.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:146) at org.testng.internal.invokers.TestMethodWorker.run(TestMethodWorker.java:128) at java.util.ArrayList.forEach(ArrayList.java:1259) at org.testng.TestRunner.privateRun(TestRunner.java:808) at org.testng.TestRunner.run(TestRunner.java:603) at org.testng.SuiteRunner.runTest(SuiteRunner.java:429) at org.testng.SuiteRunner.runSequentially(SuiteRunner.java:423) at org.testng.SuiteRunner.privateRun(SuiteRunner.java:383) at org.testng.SuiteRunner.run(SuiteRunner.java:326) at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:52) at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:95) at org.testng.TestNG.runSuitesSequentially(TestNG.java:1249) at org.testng.TestNG.runSuitesLocally(TestNG.java:1169) at org.testng.TestNG.runSuites(TestNG.java:1092) at org.testng.TestNG.run(TestNG.java:1060) at com.intellij.rt.testng.IDEARemoteTestNG.run(IDEARemoteTestNG.java:65) at com.intellij.rt.testng.RemoteTestNGStarter.main(RemoteTestNGStarter.java:105) Caused by: java.lang.NullPointerException at org.apache.fory.serializer.NonexistentClassSerializers$NonexistentClassSerializer.getClassFieldsInfo(NonexistentClassSerializers.java:161) at org.apache.fory.serializer.NonexistentClassSerializers$NonexistentClassSerializer.read(NonexistentClassSerializers.java:197) at org.apache.fory.serializer.NonexistentClassSerializers$NonexistentClassSerializer.xread(NonexistentClassSerializers.java:239) at org.apache.fory.RustXlangTest_Outer2ForyCodecMetaShared0_0.xread(RustXlangTest_Outer2ForyCodecMetaShared0_0.java:48) at org.apache.fory.Fory.xreadNonRef(Fory.java:1118) at org.apache.fory.Fory.xreadRef(Fory.java:1053) at org.apache.fory.Fory.deserialize(Fory.java:880) ... 29 more ``` ### Anything Else? _No response_ ### Are you willing to submit a PR? - [ ] I'm willing to submit a PR! -- This is an automated message from the Apache Git Service. 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