Exception in thread "main" JAVA Agent Spring Boot Application container

[Walter Xavier.Bermudez Tamayo]

Hi! I am new on AppDynamics and I want to configure a Java Agent on a simple Spring Boot Application, for trial proposes. but when I put the line -javaagent an error is going on.

[root@ip-172-31-33-180 docker-apm]# docker logs docker
Exception in thread "main" java.lang.reflect.InvocationTargetException
        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 sun.instrument.InstrumentationImpl.loadClassAndStartAgent(InstrumentationImpl.java:386)
        at sun.instrument.InstrumentationImpl.loadClassAndCallPremain(InstrumentationImpl.java:401)
Caused by: java.lang.StringIndexOutOfBoundsException: String index out of range: -1
        at java.lang.String.substring(String.java:1967)
        at com.singularity.ee.agent.appagent.AgentEntryPoint.getAgentDirFromCommandLine(AgentEntryPoint.java:1976)
        at com.singularity.ee.agent.appagent.AgentEntryPoint.getAgentInstallDirectory(AgentEntryPoint.java:992)
        at com.singularity.ee.agent.appagent.AgentEntryPoint.premain(AgentEntryPoint.java:471)
        ... 6 more
FATAL ERROR in native method: processing of -javaagent failed
Aborted (core dumped)

this is my dockerfile

FROM openjdk:8
ADD docker-spring-boot.jar docker-spring-boot.jar
EXPOSE 8080
ADD AppServerAgent AppServerAgent
RUN apt-get update && apt-get install telnet
RUN chmod -R o+x /AppServerAgent
RUN chmod 777 /AppServerAgent
WORKDIR /AppServerAgent
ENV JAVA_OPTS=-javaagent:javaagent.jar
ENTRYPOINT [ "sh", "-c", "java $JAVA_OPTS -Djava.security.egd=file:/dev/./urandom -jar /docker-spring-boot.jar" ]
#ENTRYPOINT [ "sh", "-c", "java -Djava.security.egd=file:/dev/./urandom -jar /docker-spring-boot.jar" ]

thanks

[Peter.Holditch · Accepted solution]

Walter,

I suspect if you change

ENV JAVA_OPTS=-javaagent:javaagent.jar

to

ENV JAVA_OPTS=-javaagent:/AppServerAgent/javaagent.jar

The agent may load successfully.

Note, we have published some docker files illistrating how you can install the agent in a docker environment.  This one is pretty close to what you're trying to achieve.

Warm regards,

Peter

[Walter Xavier.Bermudez Tamayo]

So Simple, thanks!