问题

Dockerfile：

FROM openjdk:8-jdk-alpine
ARG JAR_FILE=target/*.jar
ARG SCRIPT_FILE=src/main/resources/script/test.py

COPY ${JAR_FILE} app.jar
COPY ${SCRIPT_FILE} test.py
ENTRYPOINT ["java","-jar","/app.jar"]

现在我的应用程序有一行代码执行一个Python脚本，类似于这样：
代码片段：

String interpretor = "python";
String scriptFile = "test.py";
String arguments = "ping";
String[] cmd = {interpretor,scriptFile,arguments};

try {
    Process p = Runtime.getRuntime().exec(cmd);
    ...
}

**异常：**

java.io.IOException: 无法运行程序 "python"：错误=2，没有那个文件或目录

任何帮助都会感激。谢谢。

<details>
<summary>英文:</summary>

i am new to docker and trying to dockerize a java app, which in turn calls a python script

Dockerfile :

    FROM openjdk:8-jdk-alpine
    ARG JAR_FILE=target/*.jar
    ARG SCRIPT_FILE=src/main/resources/script/test.py
    
    COPY ${JAR_FILE} app.jar
    COPY ${SCRIPT_FILE} test.py
    ENTRYPOINT [&quot;java&quot;,&quot;-jar&quot;,&quot;/app.jar&quot;]

Now my App has a line of code which executes a python script, something like this :
Code snippet : 

            String interpretor = &quot;python&quot;;
            String scriptFile = &quot;test.py&quot;;
            String arguments = &quot;ping&quot;;
            String[] cmd = {interpretor,scriptFile,arguments};
          	
          	try {
                Process p = Runtime.getRuntime().exec(cmd);
                ...
            
**Exception:**

java.io.IOException: Cannot run program "python": error=2, No such file or directory

Any help appreciated.
Thanks

</details>


# 答案1
**得分**: 1

Python运行时在基础镜像`openjdk:8-jdk-alpine`中不存在，您需要在调用Python脚本之前首先安装它。

您可以尝试以下操作：

```Dockerfile
FROM openjdk:8-jdk-alpine
RUN apk add --no-cache python
ARG JAR_FILE=target/*.jar
ARG SCRIPT_FILE=src/main/resources/script/test.py
COPY ${JAR_FILE} app.jar
COPY ${SCRIPT_FILE} test.py
ENTRYPOINT ["java","-jar","/app.jar"]

FROM openjdk:8-jdk-alpine
RUN apk add --no-cache python
ARG JAR_FILE=target/*.jar
ARG SCRIPT_FILE=src/main/resources/script/test.py
COPY ${JAR_FILE} app.jar
COPY ${SCRIPT_FILE} test.py
ENTRYPOINT ["java","-jar","/app.jar"]