Startup Script Error in Docker Container

Help/Discuss
1

I’m having some trouble with a container deployed on AWS.

I was using gradle 8.1.1 and tried 8.7 but still see the same behavior.

The error I’m getting is:

ERROR: JAVA_HOME is set to an invalid directory: /opt/java/openjdk [Link ](/cloudwatch/home?region=us-west-2#logsV2:log-groups/log-group/mylg/log-events/myservice%2Fmyservice%2Fef20fd37-fa41-4942-b502-f681f193b30e?start=1712007417875$26end=1712007717875) ERROR: JAVA_HOME is set to an invalid directory: /opt/java/openjdk

The part it’s dying on is this from the service start script:

# Determine the Java command to use to start the JVM.
if [ -n "$JAVA_HOME" ] ; then
    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
        # IBM's JDK on AIX uses strange locations for the executables
        JAVACMD=$JAVA_HOME/jre/sh/java
    else
        JAVACMD=$JAVA_HOME/bin/java
    fi
    if [ ! -x "$JAVACMD" ] ; then
        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME

Please set the JAVA_HOME variable in your environment to match the
location of your Java installation."
    fi

My Dockerfile is:

FROM eclipse-temurin:11

ARG product_name
ARG product_version
ENV PRODUCT_NAME=$product_name
ENV PRODUCT_VERSION=$product_version
ENV JAVA_HOME=/opt/java/openjdk

# Who to contact if there are issues
LABEL maintainer="devteam@mycompany.com"

# Primary directory
WORKDIR /opt/mycompany/

# Copy the distribution to the primary dir
# ADD also automatically un-tars
ADD $PRODUCT_NAME-$PRODUCT_VERSION.tar /opt/mycompany/

# Make the script executable
RUN chmod +x /opt/mycompany/$PRODUCT_NAME-$PRODUCT_VERSION/bin/$PRODUCT_NAME

# Desginate the script to start at launch
ENTRYPOINT ["sh", "-c", "/opt/mycompany/$PRODUCT_NAME-$PRODUCT_VERSION/bin/myservice"]

I’ve carefully take apart the Docker container and can see the directory /opt/java/openjdk/bin contains a java executable.

I’ve tried playing with customizing the unixStartScriptTemplate.txt file, but that doesn’t seem to work. I got errors about not being able to write to build/distributions when I could see the directory is present.

gsexton-T60GTHPQ96:image gsexton$ ls -alh opt
total 0
drwxr-xr-x   4 gsexton  staff   128B Apr  1 12:50 .
drwxr-xr-x  23 gsexton  staff   736B Apr  1 16:14 ..
drwxr-xr-x   4 gsexton  staff   128B Jun 15  2023 java
gsexton-T60GTHPQ96:image gsexton$ ls -alh opt/java
total 0
drwxr-xr-x   4 gsexton  staff   128B Jun 15  2023 .
drwxr-xr-x   4 gsexton  staff   128B Apr  1 12:50 ..
-rwxr-xr-x   1 gsexton  staff     0B Dec 31  1969 .wh..wh..opq
drwxr-xr-x  11 gsexton  staff   352B Jun 15  2023 openjdk
gsexton-T60GTHPQ96:image gsexton$ ls -alh opt/java/openjdk
total 16
drwxr-xr-x  11 gsexton  staff   352B Jun 15  2023 .
drwxr-xr-x   4 gsexton  staff   128B Jun 15  2023 ..
-rw-r--r--   1 gsexton  staff   2.3K Apr 18  2023 NOTICE
drwxr-xr-x  35 gsexton  staff   1.1K Apr 18  2023 bin
drwxr-xr-x   7 gsexton  staff   224B Apr 18  2023 conf
drwxr-xr-x   9 gsexton  staff   288B Apr 18  2023 include
drwxr-xr-x  73 gsexton  staff   2.3K Apr 18  2023 jmods
drwxr-xr-x  73 gsexton  staff   2.3K Apr 18  2023 legal
drwxr-xr-x  52 gsexton  staff   1.6K Apr 18  2023 lib
drwxr-xr-x   5 gsexton  staff   160B Apr 18  2023 man
-rw-r--r--   1 gsexton  staff   1.6K Apr 18  2023 release
gsexton-T60GTHPQ96:image gsexton$ ls -alh opt/java/openjdk/bin
total 1264
drwxr-xr-x  35 gsexton  staff   1.1K Apr 18  2023 .
drwxr-xr-x  11 gsexton  staff   352B Jun 15  2023 ..
-rwxr-xr-x   1 gsexton  staff    12K Apr 18  2023 java

I’m probably overlooking something simple, but I’m just not seeing it.

Any help would be appreciated.

2

It looks like this container’s default shell is dash, not bash.

3

That’s correct, should not be a problem though.

That code / the start scripts generated by Gradle should be compatible with any POSIX compliant shell, including dash.

$ docker run --rm -it eclipse-temurin:11 sh -c 'if [ -n "$JAVA_HOME" ] ; then if [ -x "$JAVA_HOME/jre/sh/java" ] ; then JAVACMD=$JAVA_HOME/jre/sh/java; else JAVACMD=$JAVA_HOME/bin/java; fi; if [ ! -x "$JAVACMD" ] ; then echo JAVA_HOME is invalid; else echo JAVA_HOME is valid; fi; fi'
JAVA_HOME is valid
$ docker run --rm -it eclipse-temurin:11 dash -c 'if [ -n "$JAVA_HOME" ] ; then if [ -x "$JAVA_HOME/jre/sh/java" ] ; then JAVACMD=$JAVA_HOME/jre/sh/java; else JAVACMD=$JAVA_HOME/bin/java; fi; if [ ! -x "$JAVACMD" ] ; then echo JAVA_HOME is invalid; else echo JAVA_HOME is valid; fi; fi'
JAVA_HOME is valid
$ docker run --rm -it eclipse-temurin:11 bash -c 'if [ -n "$JAVA_HOME" ] ; then if [ -x "$JAVA_HOME/jre/sh/java" ] ; then JAVACMD=$JAVA_HOME/jre/sh/java; else JAVACMD=$JAVA_HOME/bin/java; fi; if [ ! -x "$JAVACMD" ] ; then echo JAVA_HOME is invalid; else echo JAVA_HOME is valid; fi; fi'
JAVA_HOME is valid

$ docker run --rm -it eclipse-temurin:11 sh -c 'rm $JAVA_HOME/bin/java; if [ -n "$JAVA_HOME" ] ; then if [ -x "$JAVA_HOME/jre/sh/java" ] ; then JAVACMD=$JAVA_HOME/jre/sh/java; else JAVACMD=$JAVA_HOME/bin/java; fi; if [ ! -x "$JAVACMD" ] ; then echo JAVA_HOME is invalid; else echo JAVA_HOME is valid; fi; fi'
JAVA_HOME is invalid
$ docker run --rm -it eclipse-temurin:11 dash -c 'rm $JAVA_HOME/bin/java; if [ -n "$JAVA_HOME" ] ; then if [ -x "$JAVA_HOME/jre/sh/java" ] ; then JAVACMD=$JAVA_HOME/jre/sh/java; else JAVACMD=$JAVA_HOME/bin/java; fi; if [ ! -x "$JAVACMD" ] ; then echo JAVA_HOME is invalid; else echo JAVA_HOME is valid; fi; fi'
JAVA_HOME is invalid
$ docker run --rm -it eclipse-temurin:11 bash -c 'rm $JAVA_HOME/bin/java; if [ -n "$JAVA_HOME" ] ; then if [ -x "$JAVA_HOME/jre/sh/java" ] ; then JAVACMD=$JAVA_HOME/jre/sh/java; else JAVACMD=$JAVA_HOME/bin/java; fi; if [ ! -x "$JAVACMD" ] ; then echo JAVA_HOME is invalid; else echo JAVA_HOME is valid; fi; fi'
JAVA_HOME is invalid
4

If you change "-c" to "-cx" you should be able to see exactly what is executed and maybe find why it is not working as expected.