使用Python运行时在Google App Engine中安装Java

问题描述：

我是Google App Engine的新手.我使用python运行时创建了一个新项目，并使用Flask公开了一些API端点.其中一种方法使用依赖于Java(8+)的python库(tabula-py).当我在本地运行时，一切正常，但是，部署到gcloud后失败了.有关在App Engine中设置Java的任何提示?我无法通过Requirements.txt安装它

I am new to the Google App Engine. I created a new project with a python runtime and used Flask to expose some API endpoints. One of the methods uses a python library(tabula-py) which has dependency on Java (8+). When I ran locally everything worked but, this is failing after deploying to gcloud. Any tips on setting up Java in the App Engine? I can't install it through the requirements.txt

非常感谢！

关于，阿比(Abhi)

Regards, Abhi

答

GAE在默认情况下仅具有您在 app.yaml 中指定的运行时的容器中运行您的应用程序.但是，您可以使用Python和Java 设置自定义运行时来运行您的应用程序.

GAE runs your apps in containers that by default only have the runtime that you specify in the app.yaml. However, you can set a custom runtime with Python and Java to run your application with.

为此，您必须使用 GAE Flexible 环境，并在 Dockerfile 中定义如下内容:

In order to do so you must use the GAE Flexible environment and define something like the following in the Dockerfile:

### 1. Get Linux
FROM alpine:3.7

### 2. Get Java via the package manager
RUN apk update \
&& apk upgrade \
&& apk add --no-cache bash \
&& apk add --no-cache --virtual=build-dependencies unzip \
&& apk add --no-cache curl \
&& apk add --no-cache openjdk8-jre

### 3. Get Python, PIP

RUN apk add --no-cache python3 \
&& python3 -m ensurepip \
&& pip3 install --upgrade pip setuptools \
&& rm -r /usr/lib/python*/ensurepip && \
if [ ! -e /usr/bin/pip ]; then ln -s pip3 /usr/bin/pip ; fi && \
if [[ ! -e /usr/bin/python ]]; then ln -sf /usr/bin/python3 /usr/bin/python; fi && \
rm -r /root/.cache

ENV FLASK_APP main.py
ENV FLASK_RUN_HOST 0.0.0.0
ENV FLASK_RUN_PORT 8080
### Get Flask for the app
RUN pip install --trusted-host pypi.python.org flask

####
#### OPTIONAL : 4. SET JAVA_HOME environment variable, uncomment the line below if you need it

#ENV JAVA_HOME="/usr/lib/jvm/java-1.8-openjdk"

####

EXPOSE 8080
ADD main.py /
CMD ["flask", "run"]

我测试了自定义运行时，它对我有用，但由于某些原因，导入无法在我的环境中(甚至在本地)失败，因此我无法测试tabula-py库.但是，我认为它应该可以工作.

I tested the custom runtime and it worked for me, but I wasn't able to test the tabula-py library because for some reason, the import fails in my environment (even locally). However, I believe it should work.

作为参考，我将 Dockerfile 基于查看更多

使用Python运行时在Google App Engine中安装Java

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