Brief Description of the Issue:
When attempting to start the Hadoop services within a Docker container, the Java Home (JAVA_HOME) is not being correctly found, resulting in errors when running the Hadoop startup scripts.

Error Problem:
The following errors are observed when trying to start the Hadoop services:

ERROR: JAVA_HOME is not set and could not be found.
Code Snippet:

in: export JAVA_HOME=/usr/lib/jvm/java-8-openjdk-amd64 && $HADOOP_HOME/sbin/start-dfs.sh

out:

root@78a289fdd88e:/# export JAVA_HOME=/usr/lib/jvm/java-8-openjdk-amd64 && $HADOOP_HOME/sbin/start-dfs.sh
Starting namenodes on [namenode]
ERROR: JAVA_HOME is not set and could not be found.
Starting datanodes
ERROR: JAVA_HOME is not set and could not be found.
Starting secondary namenodes [78a289fdd88e]
ERROR: JAVA_HOME is not set and could not be found.

My dockerfile:

ENV JAVA_HOME=/usr/lib/jvm/java-8-openjdk-amd64
ENV HADOOP_HOME=/usr/local/hadoop

RUN apt-get update && 
    DEBIAN_FRONTEND=noninteractive apt-get install -y 
    openjdk-8-jdk 
    ssh 
    rsync 
    wget 
    vim 
    curl 
    net-tools 
    libzip4 
    libsnappy1v5 
    libssl-dev 
    sudo && 
    rm -rf /var/lib/apt/lists/*

RUN wget https://archive.apache.org/dist/hadoop/common/hadoop-$HADOOP_VERSION/hadoop-$HADOOP_VERSION.tar.gz -P /tmp && 
    tar -xzf /tmp/hadoop-$HADOOP_VERSION.tar.gz -C /usr/local && 
    mv /usr/local/hadoop-$HADOOP_VERSION $HADOOP_HOME && 
    rm /tmp/hadoop-$HADOOP_VERSION.tar.gz && 
    mkdir -p $HADOOP_HOME/logs

RUN mkdir -p /data/dfs/data /data/dfs/name /data/dfs/namesecondary && 
    $HADOOP_HOME/bin/hdfs namenode -format

RUN sed -i '1s;^;export JAVA_HOME=/usr/lib/jvm/java-8-openjdk-amd64n;' $HADOOP_HOME/sbin/start-dfs.sh && 
    sed -i '1s;^;export JAVA_HOME=/usr/lib/jvm/java-8-openjdk-amd64n;' $HADOOP_HOME/sbin/start-yarn.sh

CMD ["bash", "-c", "export JAVA_HOME=/usr/lib/jvm/java-8-openjdk-amd64; service ssh start; $HADOOP_HOME/sbin/start-dfs.sh; $HADOOP_HOME/sbin/start-yarn.sh; while true; do sleep 1000; done"]

Expected Output:
It is expected that the Hadoop services start correctly after setting the JAVA_HOME. However, the errors persist even after setting the JAVA_HOME.