Failing to serialize `Thread` returned by `Thread.currentThread()` when Afterburner / Blackbird registered

[Liudapeng]

Hello, after I registered the Afterburner module, the following code has the following exception. Could you please tell me the cause and how to solve it in the case of registration? Thank you

example code ---------------------------------------------------------------------------------

   try {
        System.out.println(new ObjectMapper().findAndRegisterModules().writeValueAsString(Thread.currentThread())); 
    } catch (JsonProcessingException e) {
        e.printStackTrace();
    }

error ------------------------------------------------------------------------------------------

com.fasterxml.jackson.databind.JsonMappingException: Failed to load class 'sun.misc.Launcher$AppClassLoader$Access4JacksonSerializerffd3dc55': com.fasterxml.jackson.module.afterburner.ser.BeanPropertyAccessor (through reference chain: java.lang.Thread["contextClassLoader"]) at com.fasterxml.jackson.databind.JsonMappingException.from(JsonMappingException.java:292) at com.fasterxml.jackson.databind.SerializerProvider.reportMappingProblem(SerializerProvider.java:1223) at com.fasterxml.jackson.databind.SerializerProvider._createAndCacheUntypedSerializer(SerializerProvider.java:1341) at com.fasterxml.jackson.databind.SerializerProvider.findPrimaryPropertySerializer(SerializerProvider.java:668) at com.fasterxml.jackson.databind.ser.impl.PropertySerializerMap.findAndAddPrimarySerializer(PropertySerializerMap.java:64) at com.fasterxml.jackson.databind.ser.BeanPropertyWriter._findAndAddDynamic(BeanPropertyWriter.java:897) at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:705) at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:719) at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:155) at com.fasterxml.jackson.databind.ser.DefaultSerializerProvider._serialize(DefaultSerializerProvider.java:480) at com.fasterxml.jackson.databind.ser.DefaultSerializerProvider.serializeValue(DefaultSerializerProvider.java:319) at com.fasterxml.jackson.databind.ObjectMapper._configAndWriteValue(ObjectMapper.java:3906) at com.fasterxml.jackson.databind.ObjectMapper.writeValueAsString(ObjectMapper.java:3220) at com.limi.pandora.artemis.core.service.HomeworkServiceTest.testGetHomeworkStatus(HomeworkServiceTest.java:33) 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.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50) at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12) at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47) at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17) at org.springframework.test.context.junit4.statements.RunBeforeTestExecutionCallbacks.evaluate(RunBeforeTestExecutionCallbacks.java:74) at org.springframework.test.context.junit4.statements.RunAfterTestExecutionCallbacks.evaluate(RunAfterTestExecutionCallbacks.java:84) at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:75) at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:86) at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:84) at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325) at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:251) at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:97) at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290) at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71) at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288) at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58) at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268) at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61) at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70) at org.junit.runners.ParentRunner.run(ParentRunner.java:363) at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:190) at org.junit.runner.JUnitCore.run(JUnitCore.java:137) at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68) at com.intellij.rt.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:33) at com.intellij.rt.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:230) at com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java:58) Caused by: java.lang.IllegalArgumentException: Failed to load class 'sun.misc.Launcher$AppClassLoader$Access4JacksonSerializerffd3dc55': com.fasterxml.jackson.module.afterburner.ser.BeanPropertyAccessor at com.fasterxml.jackson.module.afterburner.util.MyClassLoader.loadAndResolve(MyClassLoader.java:96) at com.fasterxml.jackson.module.afterburner.ser.PropertyAccessorCollector.generateAccessorClass(PropertyAccessorCollector.java:170) at com.fasterxml.jackson.module.afterburner.ser.PropertyAccessorCollector.findAccessor(PropertyAccessorCollector.java:97) at com.fasterxml.jackson.module.afterburner.ser.SerializerModifier.changeProperties(SerializerModifier.java:63) at com.fasterxml.jackson.databind.ser.BeanSerializerFactory.constructBeanSerializer(BeanSerializerFactory.java:381) at com.fasterxml.jackson.databind.ser.BeanSerializerFactory.findBeanSerializer(BeanSerializerFactory.java:279) at com.fasterxml.jackson.databind.ser.BeanSerializerFactory._createSerializer2(BeanSerializerFactory.java:231) at com.fasterxml.jackson.databind.ser.BeanSerializerFactory.createSerializer(BeanSerializerFactory.java:165) at com.fasterxml.jackson.databind.SerializerProvider._createUntypedSerializer(SerializerProvider.java:1388) at com.fasterxml.jackson.databind.SerializerProvider._createAndCacheUntypedSerializer(SerializerProvider.java:1336) ... 41 more Caused by: java.lang.ClassNotFoundException: com.fasterxml.jackson.module.afterburner.ser.BeanPropertyAccessor at java.lang.ClassLoader.findClass(ClassLoader.java:530) at java.lang.ClassLoader.loadClass(ClassLoader.java:424) at java.lang.ClassLoader.loadClass(ClassLoader.java:357) at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClass(ClassLoader.java:763) at java.lang.ClassLoader.defineClass(ClassLoader.java:642) at com.fasterxml.jackson.module.afterburner.util.MyClassLoader.loadAndResolve(MyClassLoader.java:90) ... 50 more

[cowtowncoder]

I was about to say that serializing a Thread makes no sense, but then started thinking, and I think this is a valid problem.

What happens is that Afterburner will try to create an optimized code for accessor (getter) of an internal type and JVM does not let it do so. I'll see if I can figure out a way to get that blocked. In general it would be good to have means to add some ways to configure classes that are to be optimized and/or ones not to be optimized, along with things to optimize (setters, getters, fields, constructors).

[cowtowncoder]

Looks like there is an in-built mechanism that I can reuse ("java.*" already prevented actually) here, without having to do more than minimal change... so although ideally this would be improved beyond one problem, will patch just this one, so I can add in 2.12.x.

[cowtowncoder]

Fixed for 2.12.4.

[Liudapeng]

Looks like there is an in-built mechanism that I can reuse ("java.*" already prevented actually) here, without having to do more than minimal change... so although ideally this would be improved beyond one problem, will patch just this one, so I can add in 2.12.x.

thank