Unable to use jar file inside docker container when downloaded

September 26, 2023

Context: I’m trying to use opentelemetry-javaagent in my spring project.

If I get the file using curl in my Dockerfile:

RUN curl https://github.com/open-telemetry/opentelemetry-java-instrumentation/releases/download/v1.30.0/opentelemetry-javaagent.jar -o /tmp/opentelemetry-javaagent.jar && \
    chmod 540 /tmp/opentelemetry-javaagent.jar

When I run the docker image I get the following error:

Error opening zip file or JAR manifest missing : /tmp/opentelemetry-javaagent.jar
Error occurred during initialization of VM
agent library failed to init: instrument

However, if I manually download that exact file and add it:

ADD opentelemetry-javaagent.jar /tmp/opentelemetry-javaagent.jar
RUN chmod 540 /tmp/opentelemetry-javaagent.jar

It works fine. I’m probably missing something obvious but can’t put my finger on it. Does anyone know what I’m missing? Thanks in advance.

Here is the full Dockerfile:

FROM eclipse-temurin:17-jre

ARG RUN_JAVA_VERSION=1.3.8
ENV APP my-project
ENV JAVA_OPTIONS="-XshowSettings:vm"
ENV SPRING_PROFILES_ACTIVE=docker


ENV JAVA_TOOL_OPTIONS -agentlib:jdwp=transport=dt_socket,address=10200,server=y,suspend=n -javaagent:/tmp/opentelemetry-javaagent.jar -Dotel.service.name=format-adapter -Dotel.traces.exporter=zipkin

WORKDIR /app

RUN apt-get update -q \
    && apt-get install -y --no-install-recommends wget curl \
    && rm -Rf /var/lib/apt /var/cache/apt


RUN curl https://repo1.maven.org/maven2/io/fabric8/run-java-sh/${RUN_JAVA_VERSION}/run-java-sh-${RUN_JAVA_VERSION}-sh.sh -o /app/run-java.sh && \
    chmod 540 /app/run-java.sh


#THIS DOESN'T WORK
RUN curl https://github.com/open-telemetry/opentelemetry-java-instrumentation/releases/download/v1.30.0/opentelemetry-javaagent.jar -o /tmp/opentelemetry-javaagent.jar && \
    chmod 540 /tmp/opentelemetry-javaagent.jar

##THIS WORKS
#ADD opentelemetry-javaagent.jar /tmp/opentelemetry-javaagent.jar
#RUN chmod 540 /tmp/opentelemetry-javaagent.jar

ADD build/libs/${APP}-*.jar /app/${APP}.jar

HEALTHCHECK --interval=5m --timeout=3s \
  CMD curl -f http://localhost:${SERVER_PORT}/actuator/health || exit 1

ENTRYPOINT ["/app/run-java.sh"]

>Solution :

The given URL generates a redirect that curl does not follow unless you add the -L switch, so the curl command in your Dockerfile does not download anything.

As an alternative, wget follows redirects by default.