E: Unable to locate package openjdk-11-jdk on dockerfile

I have problem, my dockerfile, cant install openjdk-11-jdk, before my script is doing well, but when I want to run again, its problem, my script on dockerfile:

FROM python:3.7RUN pip install --upgrade pipRUN apt-get update && \    apt-get install -y \        openjdk-11-jdkENV JAVA_HOME=/usr/lib/jvm/java-11-openjdk-amd64/ENV PATH=$PATH:$JAVA_HOME/bin

Thank you

Dockerfile can doing well to run my apps