[Bug] Caused by: java.lang.ClassFormatError: Duplicate field name "cachedValue$sw$p8ebm33$v76p9n0" with signature

[yupd]

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• I had searched in the issues and found no similar issues.

Apache SkyWalking Component

Java Agent (apache/skywalking-java)

What happened

13-Nov-2023 19:16:57.562 SEVERE [main] org.apache.tomcat.util.digester.Digester.startElement Begin event threw exception
        java.lang.reflect.InvocationTargetException
                at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
                at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
                at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
                at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
                at org.apache.tomcat.util.digester.ObjectCreateRule.begin(ObjectCreateRule.java:115)
                at org.apache.tomcat.util.digester.Digester.startElement(Digester.java:1235)
                at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.startElement(AbstractSAXParser.java:510)
                at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanStartElement(XMLDocumentFragmentScannerImpl.java:1361)
                at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(XMLDocumentFragmentScannerImpl.java:2786)
                at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:605)
                at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:507)
                at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:867)
                at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:796)
                at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:142)
                at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1216)
                at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:644)
                at org.apache.tomcat.util.digester.Digester.parse(Digester.java:1496)
                at org.apache.catalina.startup.Catalina.load(Catalina.java:618)
                at org.apache.catalina.startup.Catalina.load(Catalina.java:669)
                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.apache.catalina.startup.Bootstrap.load(Bootstrap.java:307)
                at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:477)
        Caused by: java.lang.ClassFormatError: Duplicate field name "cachedValue$sw$p8ebm33$v76p9n0" with signature "Ljava.lang.reflect.Method;" in class file org/apache/catalina/core/StandardHostValve
                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 java.lang.ClassLoader.loadClass(ClassLoader.java:351)
                at org.apache.catalina.core.StandardHost.<init>(StandardHost.java:68)
                ... 25 more

What you expected to happen

Caused by: java.lang.ClassFormatError: Duplicate field name "cachedValue$sw$p8ebm33$v76p9n0" with signature "Ljava.lang.reflect.Method;" in class file org/apache/catalina/core/StandardHostValve

How to reproduce

• apm version

apache-skywalking-apm-9.6.0.tar.gz
apache-skywalking-java-agent-9.0.0.tgz

• tomcat version

Apache Tomcat Version 8.5.94

• jdk version

java version "1.8.0_361"
Java(TM) SE Runtime Environment (build 1.8.0_361-b09)
Java HotSpot(TM) 64-Bit Server VM (build 25.361-b09, mixed mode)

• os

[root@es-node1 esafenet]# cat /etc/redhat-release 
CentOS Linux release 7.9.2009 (Core)

Anything else

No response

Are you willing to submit a pull request to fix on your own?

• Yes I am willing to submit a pull request on my own!

Code of Conduct

• I agree to follow this project's Code of Conduct

[wu-sheng]

Duplicate field usually means the class is instrumented twice. Maybe you have two agents installed.

[yupd]

I checked that what you said is right, thank you!

[ChanaLii]

This problem seems to be caused by the image built based on FROM apache/skywalking-java-agent:9.3.0-java17, which automatically loads skywalking-agent.jar. When you declare the agent parameter -javaagent:/skywalking/agent/skywalking-agent.jar in the JVM startup parameters again, an exception will occur:

❎ This is wrong dockerfile configuration：

FROM apache/skywalking-java-agent:9.3.0-java17

WORKDIR /opt
RUN mkdir -p /opt && chmod 755 /opt
COPY ./target/app-service.jar /app.jar

ENV SW_AGENT_NAME=app-service
ENV SW_AGENT_COLLECTOR_BACKEND_SERVICE=skywalking-skywalking-helm-oap.skywalking.svc.cluster.local:11800
ENV SW_LOGGING_LEVEL=INFO

ENV JAVA_OPTS="-Dskywalking.collector.backend_service=$SW_AGENT_COLLECTOR_BACKEND_SERVICE \
                -Dskywalking.logging.level=$SW_LOGGING_LEVEL \
                -javaagent:/skywalking/agent/skywalking-agent.jar \
                -Djava.security.egd=file:/dev/./urandom"

ENTRYPOINT ["/sbin/tini", "--"]
ENTRYPOINT ["/bin/sh","ulimit","-c","unlimited"]
ENTRYPOINT ["sh", "-c", "java $JAVA_OPTS -jar /app.jar"]

✅ The 【-javaagent:/skywalking/agent/skywalking-agent.jar】 configuration should be deleted from the JVM startup parameters