我有一个springboot应用程序，正在尝试使用bytebuddy进行检测。我遇到了我无法理解的类路径问题。
首先，以下是与此相关的其他文献：
https://github.com/raphw/byte-buddy/issues/473
https://github.com/raphw/byte-buddy/issues/87
Unable to instrument apache httpclient using javaagent for spring boot uber jar application
https://github.com/raphw/byte-buddy/issues/109
https://github.com/raphw/byte-buddy/issues/473
https://github.com/raphw/byte-buddy/issues/489
https://github.com/spring-projects/spring-boot/issues/4868
https://github.com/alibaba/transmittable-thread-local/issues/161
问题是Spring-boot将应用程序捆绑到一个uber-jar中，该文件中包含其他jar
这里要注意的一点是，如果我使用IntelliJ运行应用程序，则它不会使用uber-jar，而是通过主类运行并将一堆jar作为类路径参数。
由于这种差异，通过uber-jar（java -jar target/demo-0.0.1-SNAPSHOT.jar）运行时，某些类在代理运行时不可用。这些类可在应用程序主程序时加载，因为spring-boot使用其自己的类加载器，该加载器有时是由黑白代理和应用程序主程序方法创建的。
我将在下面的各个时间点描述行为：
在代理的PreMain时
Thread.currentThread().getContextClassLoader() = Launcher$AppClassLoaderAgent.class.classLoader = Launcher$AppClassLoaderClass.forName("org.springframework.web.servlet.HandlerAdapter") => ClassNotFoundExceptionClass.forName("javax.servlet.http.HttpServletRequest") => ClassNotFoundException
spring和javax类均未加载，因为它们不是直接按照App Classloader的类路径放置的。它是一个内胆的一部分，就像app.jar!/BOOT-INF/lib/some.jar
App Classloader无法加载。
在申请主要课程时
Thread.currentThread().getContextClassLoader() = org.springframework.boot.loader.LaunchedURLClassLoaderDemoApplication.class.classloader = same as aboveClass.forName("org.springframework.web.servlet.HandlerAdapter") => loads successfully
与javax类相同，加载成功。
加载后，Class.forName("javax.servlet.http.HttpServletRequest").classLoader也是相同的LaunchedURLClassLoader。
在builder.visit调用时（bytebuddy修改类定义时）
码：
我有两个类，SpringBootInterceptor（包含拦截方法）和SpringBootInterceptorOne（包含进入和退出方法）
@Override
public AgentBuilder intercept(AgentBuilder agentBuilder) {
return agentBuilder
.type(isSubTypeOf(HandlerAdapter.class))
.transform((builder, typeDescription, classLoader, module) ->
builder.visit(Advice.to(SpringBootInterceptorOne.class, SpringBootInterceptorOne.class).on(named("handle").and(isMethod())))
);
}
在主路径中调用功能intercept()。
实际上尝试加载类型时，将调用功能visit。那时，bytebuddy尝试拦截这些方法并修改字节码。
在此代码的当前版本中，函数intercept()引发ClassNotFoundException并且不会发生拦截。
Caused by: java.lang.NoClassDefFoundError: org/springframework/web/servlet/HandlerAdapter
因此，我尝试将代码更改为以下内容：
@Override
public AgentBuilder intercept(AgentBuilder agentBuilder) {
return agentBuilder
// .type(isSubTypeOf(HandlerAdapter.class))
.type(not(isInterface())
.and(safeHasSuperType(named("org.springframework.web.servlet.HandlerAdapter"))))
.transform((builder, typeDescription, classLoader, module) ->
builder.visit(Advice.to(SpringBootInterceptorOne.class, SpringBootInterceptorOne.class).on(named("handle").and(isMethod())))
);
}
在这里，基本上是懒加载类。
来自datadog的辅助函数：
https://github.com/DataDog/dd-trace-java/blob/master/dd-java-agent/agent-tooling/src/main/java/datadog/trace/agent/tooling/ByteBuddyElementMatchers.java
完成此操作后，intercept函数不会失败，但是visit()函数的行为会很奇怪：
java.lang.IllegalStateException: Could not locate class file for my.package.name.SpringBootInterceptorOne
at net.bytebuddy.dynamic.ClassFileLocator$Resolution$Illegal.resolve(ClassFileLocator.java:118)
at net.bytebuddy.asm.Advice.to(Advice.java:431)
at net.bytebuddy.asm.Advice.to(Advice.java:400)
at net.bytebuddy.asm.Advice.to(Advice.java:375)
at net.bytebuddy.asm.Advice.to(Advice.java:361)
at my.package.name.SpringBootInterceptor.lambda$intercept$0(SpringBootInterceptor.java:30)
at net.bytebuddy.agent.builder.AgentBuilder$Transformer$Compound.transform(AgentBuilder.java:2612)
at net.bytebuddy.agent.builder.AgentBuilder$Default$Transformation$Simple$Resolution.apply(AgentBuilder.java:10117)
at net.bytebuddy.agent.builder.AgentBuilder$Default$ExecutingTransformer.doTransform(AgentBuilder.java:10494)
at net.bytebuddy.agent.builder.AgentBuilder$Default$ExecutingTransformer.transform(AgentBuilder.java:10457)
at net.bytebuddy.agent.builder.AgentBuilder$Default$ExecutingTransformer.access$1500(AgentBuilder.java:10223)
at net.bytebuddy.agent.builder.AgentBuilder$Default$ExecutingTransformer$LegacyVmDispatcher.run(AgentBuilder.java:10833)
at net.bytebuddy.agent.builder.AgentBuilder$Default$ExecutingTransformer$LegacyVmDispatcher.run(AgentBuilder.java:10780)
at java.security.AccessController.doPrivileged(Native Method)
at net.bytebuddy.agent.builder.AgentBuilder$Default$ExecutingTransformer.transform(AgentBuilder.java:10380)
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:757)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:468)
at java.net.URLClassLoader.access$100(URLClassLoader.java:74)
at java.net.URLClassLoader$1.run(URLClassLoader.java:369)
at java.net.URLClassLoader$1.run(URLClassLoader.java:363)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:362)
at java.lang.ClassLoader.loadClass(ClassLoader.java:419)
at org.springframework.boot.loader.LaunchedURLClassLoader.loadClass(LaunchedURLClassLoader.java:92)
at java.lang.ClassLoader.loadClass(ClassLoader.java:352)
at java.lang.Class.getDeclaredMethods0(Native Method)
at java.lang.Class.privateGetDeclaredMethods(Class.java:2701)
at java.lang.Class.getDeclaredMethods(Class.java:1975)
at org.springframework.util.ReflectionUtils.getDeclaredMethods(ReflectionUtils.java:463)
at org.springframework.util.ReflectionUtils.doWithMethods(ReflectionUtils.java:358)
at org.springframework.util.ReflectionUtils.getUniqueDeclaredMethods(ReflectionUtils.java:414)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.lambda$getTypeForFactoryMethod$2(AbstractAutowireCapableBeanFactory.java:743)
at java.util.concurrent.ConcurrentHashMap.computeIfAbsent(ConcurrentHashMap.java:1688)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.getTypeForFactoryMethod(AbstractAutowireCapableBeanFactory.java:742)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.determineTargetType(AbstractAutowireCapableBeanFactory.java:681)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.predictBeanType(AbstractAutowireCapableBeanFactory.java:649)
at org.springframework.beans.factory.support.AbstractBeanFactory.isFactoryBean(AbstractBeanFactory.java:1604)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doGetBeanNamesForType(DefaultListableBeanFactory.java:520)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBeanNamesForType(DefaultListableBeanFactory.java:491)
at org.springframework.boot.autoconfigure.condition.OnBeanCondition.collectBeanNamesForType(OnBeanCondition.java:230)
at org.springframework.boot.autoconfigure.condition.OnBeanCondition.getBeanNamesForType(OnBeanCondition.java:223)
at org.springframework.boot.autoconfigure.condition.OnBeanCondition.getBeanNamesForType(OnBeanCondition.java:213)
at org.springframework.boot.autoconfigure.condition.OnBeanCondition.getMatchingBeans(OnBeanCondition.java:167)
at org.springframework.boot.autoconfigure.condition.OnBeanCondition.getMatchOutcome(OnBeanCondition.java:142)
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.ConfigurationClassBeanDefinitionReader.loadBeanDefinitionsForBeanMethod(ConfigurationClassBeanDefinitionReader.java:184)
at org.springframework.context.annotation.ConfigurationClassBeanDefinitionReader.loadBeanDefinitionsForConfigurationClass(ConfigurationClassBeanDefinitionReader.java:144)
at org.springframework.context.annotation.ConfigurationClassBeanDefinitionReader.loadBeanDefinitions(ConfigurationClassBeanDefinitionReader.java:120)
at org.springframework.context.annotation.ConfigurationClassPostProcessor.processConfigBeanDefinitions(ConfigurationClassPostProcessor.java:331)
at org.springframework.context.annotation.ConfigurationClassPostProcessor.postProcessBeanDefinitionRegistry(ConfigurationClassPostProcessor.java:236)
at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanDefinitionRegistryPostProcessors(PostProcessorRegistrationDelegate.java:275)
at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:95)
at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:706)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:532)
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:141)
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:747)
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:315)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1215)
at com.example.demo.DemoApplication.main(DemoApplication.java:10)
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:48)
at org.springframework.boot.loader.Launcher.launch(Launcher.java:87)
at org.springframework.boot.loader.Launcher.launch(Launcher.java:51)
at org.springframework.boot.loader.JarLauncher.main(JarLauncher.java:52)
这一点，
Thread.currentThread().getContextClassLoader() => LaunchedURLClassLoaderSpringBootInterceptor.class.getClassLoader() = null
在调试器窗口中键入SpringBootInterceptor.class不会失败，但是Class.forName("my.package.name.SpringBootInterceptorOne") => NoClassDefFound
接下来，我尝试了以下方法：
@Override
public AgentBuilder intercept(AgentBuilder agentBuilder) {
ClassLoader cl = Thread.currentThread().getContextClassLoader();
return agentBuilder
// .type(isSubTypeOf(HandlerAdapter.class))
.type(not(isInterface())
.and(safeHasSuperType(named("org.springframework.web.servlet.HandlerAdapter"))))
.transform((builder, typeDescription, classLoader, module) -> {
try {
Class<?> claz = Thread.currentThread().getContextClassLoader().loadClass("my.package.name.SpringBootInterceptorOne");
return builder.visit(Advice.to(claz, claz,
new ClassFileLocator.Compound(ClassFileLocator.ForClassLoader.of(cl),
ClassFileLocator.ForClassLoader.of(Thread.currentThread().getContextClassLoader())
)).on(named("handle").and(isMethod())));
} catch (ClassNotFoundException e) {
e.printStackTrace();
return builder;
}
}
);
}
这将导致拦截器被“安装”。进入和退出方法称为okay。但是将参数强制转换为适当的类型会导致参数类型错误
exit spring boot
[Ljava.lang.Object;@c83066a
java.lang.NoClassDefFoundError: javax/servlet/http/HttpServletRequest
at my.package.name.SpringBootInterceptorOne.getEndpoint(SpringBootInterceptorOne.java:36)
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1040)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:943)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006)
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:634)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:367)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:860)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1598)
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:748)
这里是SpringBootInterceptorOne供参考：
@Advice.OnMethodExit
static void exit(@Advice.Origin final Executable executable,
@Advice.This Object handlerAdapter,
@Advice.AllArguments Object[] arguments,
@Advice.Enter final TimerContext ctx) {
// final long duration = ctx.getDuration();
System.out.println("exit spring boot");
String e = getEndpoint(arguments);
System.out.println(e);
}
public static String getEndpoint(Object[] arguments) {
System.out.println(arguments);
HttpServletRequest request = (HttpServletRequest) arguments[0];
HandlerMethod handler = (HandlerMethod) arguments[2];
return "ad";
}
更新：
根据答案中提供的建议，我尝试了以下操作：
@Override
public AgentBuilder intercept(AgentBuilder agentBuilder) {
return agentBuilder
// .type(isSubTypeOf(HandlerAdapter.class))
.type(not(isInterface())
.and(safeHasSuperType(named("org.springframework.web.servlet.HandlerAdapter"))))
.transform(new AgentBuilder.Transformer.ForAdvice()
.include(SpringBootInterceptorOne.class.getClassLoader())
.include(getClass().getClassLoader())
.advice(named("handle"), SpringBootInterceptorOne.class.getName())
);
}
它再次抛出错误：
java.lang.NoClassDefFoundError: javax/servlet/http/HttpServletRequest
at io.signoz.interceptors.http.server.springboot.SpringBootInterceptorOne.getEndpoint(SpringBootInterceptorOne.java:37) ~[na:na]
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) ~[spring-webmvc-5.2.3.RELEASE.jar!/:5.2.3.RELEASE]
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1040) ~[spring-webmvc-5.2.3.RELEASE.jar!/:5.2.3.RELEASE]
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:943) ~[spring-webmvc-5.2.3.RELEASE.jar!/:5.2.3.RELEASE]
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006) ~[spring-webmvc-5.2.3.RELEASE.jar!/:5.2.3.RELEASE]
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898) ~[spring-webmvc-5.2.3.RELEASE.jar!/:5.2.3.RELEASE]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:634) ~[tomcat-embed-core-9.0.30.jar!/:9.0.30]
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883) ~[spring-webmvc-5.2.3.RELEASE.jar!/:5.2.3.RELEASE]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:741) ~[tomcat-embed-core-9.0.30.jar!/:9.0.30]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) ~[tomcat-embed-core-9.0.30.jar!/:9.0.30]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.30.jar!/:9.0.30]
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) ~[tomcat-embed-websocket-9.0.30.jar!/:9.0.30]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.30.jar!/:9.0.30]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.30.jar!/:9.0.30]
at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) ~[spring-web-5.2.3.RELEASE.jar!/:5.2.3.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.3.RELEASE.jar!/:5.2.3.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.30.jar!/:9.0.30]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.30.jar!/:9.0.30]
at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) ~[spring-web-5.2.3.RELEASE.jar!/:5.2.3.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.3.RELEASE.jar!/:5.2.3.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.30.jar!/:9.0.30]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.30.jar!/:9.0.30]
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) ~[spring-web-5.2.3.RELEASE.jar!/:5.2.3.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.3.RELEASE.jar!/:5.2.3.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.30.jar!/:9.0.30]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.30.jar!/:9.0.30]
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202) ~[tomcat-embed-core-9.0.30.jar!/:9.0.30]
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) [tomcat-embed-core-9.0.30.jar!/:9.0.30]
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541) [tomcat-embed-core-9.0.30.jar!/:9.0.30]
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139) [tomcat-embed-core-9.0.30.jar!/:9.0.30]
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) [tomcat-embed-core-9.0.30.jar!/:9.0.30]
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) [tomcat-embed-core-9.0.30.jar!/:9.0.30]
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343) [tomcat-embed-core-9.0.30.jar!/:9.0.30]
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:367) [tomcat-embed-core-9.0.30.jar!/:9.0.30]
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65) [tomcat-embed-core-9.0.30.jar!/:9.0.30]
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:860) [tomcat-embed-core-9.0.30.jar!/:9.0.30]
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1598) [tomcat-embed-core-9.0.30.jar!/:9.0.30]
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) [tomcat-embed-core-9.0.30.jar!/:9.0.30]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [na:1.8.0_242]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [na:1.8.0_242]
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-embed-core-9.0.30.jar!/:9.0.30]
at java.lang.Thread.run(Thread.java:748) [na:1.8.0_242]
参考方案
问题在于，建议类将作为代理的一部分加载到系统类加载器上，而实际的应用程序代码将加载到系统类加载器不可见的子类加载器上。如果您在启动加载程序上加载代理，这种情况也不会改变。因此，代理无法加载uber-jar中的HttpServletRequest类。
这是代理程序的一个典型问题，Byte Buddy通过使用Transformer.ForAdvice实例而不是直接使用Advice类来规避它。然后，Byte Buddy创建一个虚拟的类加载器层次结构，该层次结构将考虑两个类加载器所代表的类。
更新：问题是您正在调用在系统类加载器中定义的拦截器，其中相关类不可用。带注释的代码将被内联，但是被调用的方法将不被内联。如果将代码复制粘贴到带注释的方法中，则其行为与您期望的一样。字节好友使用带注释的代码作为模板，并重用了javac发出的许多信息，以确保快速转换。因此，该库不能简单地复制该方法，而应该将整个方法主体提供给javac。
RabbitMQ影响JDBC连接池 - java我有一个运行良好的Web servlet。我决定用RabbitMQ替换与后端服务器的TCP连接。在进行一些负载测试时，我注意到它很快开始失败，超时等待空闲的JDBC连接。ERROR [http-bio-8080-exec-12] JDBCExceptionReporter.logExceptions(234) | Cannot get a connectio…
运行lint测试时出现JAXBException - java我有一个通过circleCI上的棉绒测试的应用程序，但在本地计算机上失败，并出现以下错误java.lang.NoClassDefFoundError: javax/xml/bind/JAXBException at java.base/java.lang.Class.getDeclaredConstructors0(Native Method) at jav…
java:继承 - java有哪些替代继承的方法？ java大神给出的解决方案 有效的Java：偏重于继承而不是继承。 （这实际上也来自“四人帮”）。他提出的理由是，如果扩展类未明确设计为继承，则继承会引起很多不正常的副作用。例如，对super.someMethod()的任何调用都可以引导您通过未知代码的意外路径。取而代之的是，持有对本来应该扩展的类的引用，然后委托给它。这是与Eric…
Java:BigInteger，如何通过OutputStream编写它 - java我想将BigInteger写入文件。做这个的最好方式是什么。当然，我想从输入流中读取（使用程序，而不是人工）。我必须使用ObjectOutputStream还是有更好的方法？目的是使用尽可能少的字节。谢谢马丁 参考方案 Java序列化（ObjectOutputStream / ObjectInputStream）是将对象序列化为八位字节序列的一种通用方法。但…
Java-如何将此字符串转换为日期？ - java我从服务器收到此消息，我不明白T和Z的含义，2012-08-24T09:59:59Z将此字符串转换为Date对象的正确SimpleDateFormat模式是什么？ java大神给出的解决方案 这是ISO 8601标准。您可以使用SimpleDateFormat simpleFormat = new SimpleDateFormat("yyyy-MM…