SpringBoot fatjar模式下，Instrument方法中出现强转逻辑导致asm报 java.lang.TypeNotPresentException: Type com/one/agent/app/api/model/EmployeeAndy not present #47
Description
异常栈：
2023-03-14 10:32:39 [main] ERROR c.a.o.s.OneAgentClassFileTransformer -transform error, loader: org.springframework.boot.loader.LaunchedURLClassLoader@6a03bcb1, className: com/saleson/oneagent/springboot/app/demo/service/EmployeeServiceImpl, transformer: com.alibaba.bytekit.asm.instrument.InstrumentTransformer@293d0107
java.lang.TypeNotPresentException: Type com/one/agent/app/api/model/EmployeeAndy not present
at com.alibaba.deps.org.objectweb.asm.ClassWriter.getCommonSuperClass(ClassWriter.java:1041)
at com.alibaba.deps.org.objectweb.asm.SymbolTable.addMergedType(SymbolTable.java:1202)
at com.alibaba.deps.org.objectweb.asm.Frame.merge(Frame.java:1299)
at com.alibaba.deps.org.objectweb.asm.Frame.merge(Frame.java:1197)
at com.alibaba.deps.org.objectweb.asm.MethodWriter.computeAllFrames(MethodWriter.java:1611)
at com.alibaba.deps.org.objectweb.asm.MethodWriter.visitMaxs(MethodWriter.java:1547)
at com.alibaba.deps.org.objectweb.asm.tree.MethodNode.accept(MethodNode.java:767)
at com.alibaba.deps.org.objectweb.asm.tree.MethodNode.accept(MethodNode.java:647)
at com.alibaba.deps.org.objectweb.asm.tree.ClassNode.accept(ClassNode.java:451)
at com.alibaba.bytekit.utils.AsmUtils.toBytes(AsmUtils.java:86)
at com.alibaba.bytekit.asm.instrument.InstrumentTransformer.transform(InstrumentTransformer.java:60)
at com.alibaba.oneagent.service.OneAgentClassFileTransformer.transform(OneAgentClassFileTransformer.java:35)
at sun.instrument.TransformerManager.transform(TransformerManager.java:188)
at sun.instrument.InstrumentationImpl.transform(InstrumentationImpl.java:428)
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:756)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:473)
at java.net.URLClassLoader.access$100(URLClassLoader.java:74)
at java.net.URLClassLoader$1.run(URLClassLoader.java:369)
at java.net.URLClassLoader$1.run(URLClassLoader.java:363)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:362)
at java.lang.ClassLoader.loadClass(ClassLoader.java:418)
at org.springframework.boot.loader.LaunchedURLClassLoader.loadClass(LaunchedURLClassLoader.java:151)
at java.lang.ClassLoader.loadClass(ClassLoader.java:351)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:348)
at org.springframework.util.ClassUtils.forName(ClassUtils.java:284)
at org.springframework.beans.factory.support.AbstractBeanDefinition.resolveBeanClass(AbstractBeanDefinition.java:469)
at org.springframework.beans.factory.support.AbstractBeanFactory.doResolveBeanClass(AbstractBeanFactory.java:1621)
at org.springframework.beans.factory.support.AbstractBeanFactory.resolveBeanClass(AbstractBeanFactory.java:1548)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.determineTargetType(AbstractAutowireCapableBeanFactory.java:704)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.predictBeanType(AbstractAutowireCapableBeanFactory.java:674)
at org.springframework.beans.factory.support.AbstractBeanFactory.isFactoryBean(AbstractBeanFactory.java:1684)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doGetBeanNamesForType(DefaultListableBeanFactory.java:570)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBeanNamesForType(DefaultListableBeanFactory.java:542)
at org.springframework.boot.autoconfigure.web.servlet.DispatcherServletAutoConfiguration$DispatcherServletRegistrationCondition.checkServletRegistration(DispatcherServletAutoConfiguration.java:187)
at org.springframework.boot.autoconfigure.web.servlet.DispatcherServletAutoConfiguration$DispatcherServletRegistrationCondition.getMatchOutcome(DispatcherServletAutoConfiguration.java:167)
at org.springframework.boot.autoconfigure.condition.SpringBootCondition.matches(SpringBootCondition.java:47)
at org.springframework.context.annotation.ConditionEvaluator.shouldSkip(ConditionEvaluator.java:108)
at org.springframework.context.annotation.ConfigurationClassParser.processConfigurationClass(ConfigurationClassParser.java:225)
at org.springframework.context.annotation.ConfigurationClassParser.processMemberClasses(ConfigurationClassParser.java:371)
at org.springframework.context.annotation.ConfigurationClassParser.doProcessConfigurationClass(ConfigurationClassParser.java:271)
at org.springframework.context.annotation.ConfigurationClassParser.processConfigurationClass(ConfigurationClassParser.java:249)
at org.springframework.context.annotation.ConfigurationClassParser.processImports(ConfigurationClassParser.java:599)
at org.springframework.context.annotation.ConfigurationClassParser.access$800(ConfigurationClassParser.java:110)
at org.springframework.context.annotation.ConfigurationClassParser$DeferredImportSelectorGroupingHandler.lambda$processGroupImports$1(ConfigurationClassParser.java:812)
at java.util.ArrayList.forEach(ArrayList.java:1259)
at org.springframework.context.annotation.ConfigurationClassParser$DeferredImportSelectorGroupingHandler.processGroupImports(ConfigurationClassParser.java:809)
at org.springframework.context.annotation.ConfigurationClassParser$DeferredImportSelectorHandler.process(ConfigurationClassParser.java:780)
at org.springframework.context.annotation.ConfigurationClassParser.parse(ConfigurationClassParser.java:192)
at org.springframework.context.annotation.ConfigurationClassPostProcessor.processConfigBeanDefinitions(ConfigurationClassPostProcessor.java:331)
at org.springframework.context.annotation.ConfigurationClassPostProcessor.postProcessBeanDefinitionRegistry(ConfigurationClassPostProcessor.java:247)
at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanDefinitionRegistryPostProcessors(PostProcessorRegistrationDelegate.java:311)
at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:112)
at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:746)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:564)
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:145)
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:745)
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:423)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:307)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1317)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1306)
at com.saleson.oneagent.springboot.app.demo.AppDemoApplication.main(AppDemoApplication.java:21)
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.springframework.boot.loader.MainMethodRunner.run(MainMethodRunner.java:49)
at org.springframework.boot.loader.Launcher.launch(Launcher.java:108)
at org.springframework.boot.loader.Launcher.launch(Launcher.java:58)
at org.springframework.boot.loader.JarLauncher.main(JarLauncher.java:88)
Caused by: java.lang.ClassNotFoundException: com.one.agent.app.api.model.EmployeeAndy
at java.net.URLClassLoader.findClass(URLClassLoader.java:387)
at java.lang.ClassLoader.loadClass(ClassLoader.java:418)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:355)
at java.lang.ClassLoader.loadClass(ClassLoader.java:351)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:348)
at com.alibaba.deps.org.objectweb.asm.ClassWriter.getCommonSuperClass(ClassWriter.java:1039)
... 72 common frames omitted
复现逻辑：
- 在common module中新建2个类，Employee, 以及其子类EmployeeAndy。
- 新建springboot module， 并添加spring-boot-maven-plugin 将其编译为springboot fatjar。
- 在instrument-lib.jar中添加Instrument类，并在增强方法中加入强转代码:
@Instrument(Interface = {"com.one.agent.app.api.EmployeeService"})
public class EmployeeServiceInst {
public void check(Employee employee) {
if(employee instanceof EmployeeAndy){
employee = (EmployeeAndy) employee;
System.out.println("EmployeeServiceInst.check employee type is " + EmployeeAndy.class);
}
InstrumentApi.invokeOrigin();
}
- 添加one-java-agent参数运行springboot fatjar， 在oneagent.log中出现上述异常日志。
原因：
反复排查后，发现asm在计算方法的最大栈空间和最大本地变量数时，遇到强转逻辑会执行到ClassWriter.getCommonSuperClass()方法，该方法会去尝试加载被转换对象的class和转换的目标class，进行assignable from比对判断。问题在于此方法中的ClassLoader是Launcher$AppClassLoader， debug截图如下：
在springboot fatjar 运行模式下， Launcher$AppClassLoader是无法加载到springboot fatjar中的class和资源，所以导致此处抛出ClassNotFoundException， 被捕获后包装成TypeNotPresentException抛出。