skywalking agent start error

[chenxue1107]

[skywalking : V8.4.0]
no extend classloader in my project，please help me resolve this question，thanks！

ERROR 2021-12-17 19:08:17:781 main SkyWalkingAgent : Enhance class org.apache.skywalking.apm.toolkit.log.log4j.v2.x.TraceIdConverter error.
org.apache.skywalking.apm.agent.core.plugin.PluginException: Can't create InstanceMethodsAroundInterceptor.
at org.apache.skywalking.apm.agent.core.plugin.interceptor.enhance.InstMethodsInter.(InstMethodsInter.java:54)
at org.apache.skywalking.apm.agent.core.plugin.interceptor.enhance.ClassEnhancePluginDefine.enhanceInstance(ClassEnhancePluginDefine.java:180)
at org.apache.skywalking.apm.agent.core.plugin.interceptor.enhance.ClassEnhancePluginDefine.enhance(ClassEnhancePluginDefine.java:74)
at org.apache.skywalking.apm.agent.core.plugin.AbstractClassEnhancePluginDefine.define(AbstractClassEnhancePluginDefine.java:89)
at org.apache.skywalking.apm.agent.SkyWalkingAgent$Transformer.transform(SkyWalkingAgent.java:156)
at org.apache.skywalking.apm.dependencies.net.bytebuddy.agent.builder.AgentBuilder$Default$ExecutingTransformer.doTransform(AgentBuilder.java:10369)
at org.apache.skywalking.apm.dependencies.net.bytebuddy.agent.builder.AgentBuilder$Default$ExecutingTransformer.transform(AgentBuilder.java:10307)
at org.apache.skywalking.apm.dependencies.net.bytebuddy.agent.builder.AgentBuilder$Default$ExecutingTransformer.access$1600(AgentBuilder.java:10073)
at org.apache.skywalking.apm.dependencies.net.bytebuddy.agent.builder.AgentBuilder$Default$ExecutingTransformer$LegacyVmDispatcher.run(AgentBuilder.java:10692)
at org.apache.skywalking.apm.dependencies.net.bytebuddy.agent.builder.AgentBuilder$Default$ExecutingTransformer$LegacyVmDispatcher.run(AgentBuilder.java:10639)
at java.security.AccessController.doPrivileged(Native Method)
at org.apache.skywalking.apm.dependencies.net.bytebuddy.agent.builder.AgentBuilder$Default$ExecutingTransformer.transform(AgentBuilder.java:10230)
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:468)
at java.net.URLClassLoader.access$100(URLClassLoader.java:74)
at java.net.URLClassLoader$1.run(URLClassLoader.java:369)
at java.net.URLClassLoader$1.run(URLClassLoader.java:363)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:362)
at java.lang.ClassLoader.loadClass(ClassLoader.java:418)
at java.lang.ClassLoader.loadClass(ClassLoader.java:351)
at org.apache.logging.log4j.core.config.plugins.util.PluginRegistry.decodeCacheFiles(PluginRegistry.java:181)
at org.apache.logging.log4j.core.config.plugins.util.PluginRegistry.loadFromMainClassLoader(PluginRegistry.java:119)
at org.apache.logging.log4j.core.config.plugins.util.PluginManager.collectPlugins(PluginManager.java:132)
at org.apache.logging.log4j.core.pattern.PatternParser.(PatternParser.java:132)
at org.apache.logging.log4j.core.pattern.PatternParser.(PatternParser.java:113)
at org.apache.logging.log4j.core.layout.PatternLayout.createPatternParser(PatternLayout.java:258)
at org.apache.logging.log4j.core.layout.PatternLayout$SerializerBuilder.build(PatternLayout.java:397)
at org.apache.logging.log4j.core.layout.PatternLayout.(PatternLayout.java:139)
at org.apache.logging.log4j.core.layout.PatternLayout.(PatternLayout.java:60)
at org.apache.logging.log4j.core.layout.PatternLayout$Builder.build(PatternLayout.java:686)
at org.apache.logging.log4j.core.config.AbstractConfiguration.setToDefault(AbstractConfiguration.java:625)
at org.apache.logging.log4j.core.config.DefaultConfiguration.(DefaultConfiguration.java:47)
at org.apache.logging.log4j.core.LoggerContext.(LoggerContext.java:98)
at org.apache.logging.log4j.core.selector.ClassLoaderContextSelector.createContext(ClassLoaderContextSelector.java:249)
at org.apache.logging.log4j.core.selector.ClassLoaderContextSelector.locateContext(ClassLoaderContextSelector.java:213)
at org.apache.logging.log4j.core.selector.ClassLoaderContextSelector.getContext(ClassLoaderContextSelector.java:137)
at org.apache.logging.log4j.core.selector.ClassLoaderContextSelector.getContext(ClassLoaderContextSelector.java:124)
at org.apache.logging.log4j.core.selector.ClassLoaderContextSelector.getContext(ClassLoaderContextSelector.java:118)
at org.apache.logging.log4j.core.impl.Log4jContextFactory.getContext(Log4jContextFactory.java:150)
at org.apache.logging.log4j.core.impl.Log4jContextFactory.getContext(Log4jContextFactory.java:47)
at org.apache.logging.log4j.LogManager.getContext(LogManager.java:194)
at org.apache.logging.log4j.spi.AbstractLoggerAdapter.getContext(AbstractLoggerAdapter.java:138)
at org.apache.logging.slf4j.Log4jLoggerFactory.getContext(Log4jLoggerFactory.java:45)
at org.apache.logging.log4j.spi.AbstractLoggerAdapter.getLogger(AbstractLoggerAdapter.java:48)
at org.apache.logging.slf4j.Log4jLoggerFactory.getLogger(Log4jLoggerFactory.java:30)
at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:363)
at org.apache.commons.logging.impl.SLF4JLogFactory.getInstance(SLF4JLogFactory.java:155)
at org.apache.commons.logging.impl.SLF4JLogFactory.getInstance(SLF4JLogFactory.java:132)
at org.apache.commons.logging.LogFactory.getLog(LogFactory.java:273)
at org.springframework.boot.SpringApplication.(SpringApplication.java:196)
at utry.oam.OamApplication.main(OamApplication.java:36)
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 com.intellij.rt.execution.CommandLineWrapper.main(CommandLineWrapper.java:66)
Caused by: java.lang.NoClassDefFoundError: org/apache/skywalking/apm/agent/core/plugin/interceptor/enhance/InstanceMethodsAroundInterceptor
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:756)
at java.lang.ClassLoader.defineClass(ClassLoader.java:635)
at org.apache.skywalking.apm.agent.core.plugin.loader.AgentClassLoader.findClass(AgentClassLoader.java:112)
at java.lang.ClassLoader.loadClass(ClassLoader.java:418)
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.apache.skywalking.apm.agent.core.plugin.loader.InterceptorInstanceLoader.load(InterceptorInstanceLoader.java:71)

[wu-sheng]

Caused by: java.lang.NoClassDefFoundError: org/apache/skywalking/apm/agent/core/plugin/interceptor/enhance/InstanceMethodsAroundInterceptor

No class def means, your class loader is not expected, and somehow the core interceptor can't be accessed in the plugin scope. It is most likely your codes are special. But as it is private, it is out of community's understanding.

[zhuhao22]

Hi, i have the same problem. My environment requires that the application must add pinpoint, so i'm not sure whether the plugin about log4j in pinpoint has affected it. I want to know what will happen if skywalking agent doesn't load the log4j.

error log:
ERROR 2023-06-21 17:05:32.472 main SkyWalkingAgent : Enhance class org.apache.logging.log4j.core.impl.Log4jLogEvent error.
org.apache.skywalking.apm.agent.core.plugin.PluginException: Can't create InstanceConstructorInterceptorV2.
at org.apache.skywalking.apm.agent.core.plugin.interceptor.enhance.ConstructorInter.(ConstructorInter.java:50)
at org.apache.skywalking.apm.agent.core.plugin.interceptor.enhance.ClassEnhancePluginDefine.enhanceInstance(ClassEnhancePluginDefine.java:124
)
at org.apache.skywalking.apm.agent.core.plugin.AbstractClassEnhancePluginDefine.enhance(AbstractClassEnhancePluginDefine.java:116)
at org.apache.skywalking.apm.agent.core.plugin.AbstractClassEnhancePluginDefine.define(AbstractClassEnhancePluginDefine.java:96)
at org.apache.skywalking.apm.agent.SkyWalkingAgent$Transformer.transform(SkyWalkingAgent.java:165)
at org.apache.skywalking.apm.dependencies.net.bytebuddy.agent.builder.AgentBuilder$Default$ExecutingTransformer.doTransform(AgentBuilder.java
:11901)
at org.apache.skywalking.apm.dependencies.net.bytebuddy.agent.builder.AgentBuilder$Default$ExecutingTransformer.transform(AgentBuilder.java:1
1838)
at org.apache.skywalking.apm.dependencies.net.bytebuddy.agent.builder.AgentBuilder$Default$ExecutingTransformer.access$1700(AgentBuilder.java
:11555)
at org.apache.skywalking.apm.dependencies.net.bytebuddy.agent.builder.AgentBuilder$Default$ExecutingTransformer$Java9CapableVmDispatcher.run(
AgentBuilder.java:12318)
at org.apache.skywalking.apm.dependencies.net.bytebuddy.agent.builder.AgentBuilder$Default$ExecutingTransformer$Java9CapableVmDispatcher.run(
AgentBuilder.java:12250)
at java.base/java.security.AccessController.doPrivileged(AccessController.java:399)
at org.apache.skywalking.apm.dependencies.net.bytebuddy.agent.builder.AgentBuilder$Default$ExecutingTransformer.doPrivileged(AgentBuilder.jav
a)
at org.apache.skywalking.apm.dependencies.net.bytebuddy.agent.builder.AgentBuilder$Default$ExecutingTransformer.transform(AgentBuilder.java:1
1781)
at org.apache.skywalking.apm.dependencies.net.bytebuddy.agent.builder.AgentBuilder$Default$ExecutingTransformer$ByteBuddy$ModuleSupport.trans
form(Unknown Source)
at java.instrument/sun.instrument.TransformerManager.transform(TransformerManager.java:188)
at java.instrument/sun.instrument.InstrumentationImpl.transform(InstrumentationImpl.java:541)
at java.base/java.lang.ClassLoader.defineClass1(Native Method)
at java.base/java.lang.ClassLoader.defineClass(ClassLoader.java:1012)
at java.base/java.security.SecureClassLoader.defineClass(SecureClassLoader.java:150)
at java.base/java.net.URLClassLoader.defineClass(URLClassLoader.java:524)
at java.base/java.net.URLClassLoader$1.run(URLClassLoader.java:427)
at java.base/java.net.URLClassLoader$1.run(URLClassLoader.java:421)
at java.base/java.security.AccessController.doPrivileged(AccessController.java:712)
at java.base/java.net.URLClassLoader.findClass(URLClassLoader.java:420)
at com.navercorp.pinpoint.bootstrap.java9.classloader.Java9ClassLoader.loadClass(Java9ClassLoader.java:103)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:520)
at pinpoint.agent/pinpoint.agent/org.apache.logging.log4j.core.LoggerContext.setConfiguration(LoggerContext.java:596)
at pinpoint.agent/pinpoint.agent/org.apache.logging.log4j.core.LoggerContext.start(LoggerContext.java:285)
at pinpoint.agent/pinpoint.agent/org.apache.logging.log4j.core.impl.Log4jContextFactory.getContext(Log4jContextFactory.java:240)
at pinpoint.agent/pinpoint.agent/org.apache.logging.log4j.core.impl.Log4jContextFactory.getContext(Log4jContextFactory.java:45)
at pinpoint.agent/pinpoint.agent/org.apache.logging.log4j.LogManager.getContext(LogManager.java:287)
at pinpoint.agent/pinpoint.agent/com.navercorp.pinpoint.profiler.logging.Log4j2LoggingSystem.getLoggerContext(Log4j2LoggingSystem.java:104)
at pinpoint.agent/pinpoint.agent/com.navercorp.pinpoint.profiler.logging.Log4j2LoggingSystem.start(Log4j2LoggingSystem.java:43)
at pinpoint.agent/pinpoint.agent/com.navercorp.pinpoint.profiler.DefaultAgent.(DefaultAgent.java:71)
at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:77)
at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.base/java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:499)
at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:480)
at com.navercorp.pinpoint.bootstrap.AgentBootLoader$1.call(AgentBootLoader.java:52)
at com.navercorp.pinpoint.bootstrap.ContextClassLoaderExecuteTemplate.execute(ContextClassLoaderExecuteTemplate.java:41)
at com.navercorp.pinpoint.bootstrap.AgentBootLoader.boot(AgentBootLoader.java:47)
at com.navercorp.pinpoint.bootstrap.PinpointStarter.start(PinpointStarter.java:139)
at com.navercorp.pinpoint.bootstrap.PinpointBootStrap.premain(PinpointBootStrap.java:89)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:568)
at java.instrument/sun.instrument.InstrumentationImpl.loadClassAndStartAgent(InstrumentationImpl.java:491)
at java.instrument/sun.instrument.InstrumentationImpl.loadClassAndCallPremain(InstrumentationImpl.java:503)
Caused by: java.lang.NoClassDefFoundError: org/apache/skywalking/apm/agent/core/plugin/interceptor/enhance/InstanceConstructorInterceptor
at java.base/java.lang.ClassLoader.defineClass1(Native Method)
at java.base/java.lang.ClassLoader.defineClass(ClassLoader.java:1012)
at java.base/java.lang.ClassLoader.defineClass(ClassLoader.java:874)
at org.apache.skywalking.apm.agent.core.plugin.loader.AgentClassLoader.findClass(AgentClassLoader.java:112)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:587)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:520)
at java.base/java.lang.Class.forName0(Native Method)
at java.base/java.lang.Class.forName(Class.java:467)
at org.apache.skywalking.apm.agent.core.plugin.loader.InterceptorInstanceLoader.load(InterceptorInstanceLoader.java:71)
at org.apache.skywalking.apm.agent.core.plugin.interceptor.enhance.ConstructorInter.(ConstructorInter.java:48)
... 49 more
Caused by: java.lang.ClassNotFoundException: Can't find org.apache.skywalking.apm.agent.core.plugin.interceptor.enhance.InstanceConstructorIntercepto
r

[wu-sheng]

We don't guarantee to work with other agents. Especially, two APM agents are too risky.
I would say, only install SkyWalking when you need it as your APM system, don't mix two. It is not just about compatibility, also performance overhead could be very very high.