用于 sprin-boot 应用程序的 Dockerfile 无法构建映像

Question

I generated a Dockerfile for my spring-boot application, which is called demo-api . This is the content of my Dockerfile:

FROM openjdk:11-slim
COPY target/demo_api*.jar ./demo_api.jar
ENTRYPOINT exec java $JAVA_OPTS -Djava.security.egd=file:/dev/./urandom -Duser.timezone=GMT -jar /demo_api.jar
EXPOSE 8080

However when I run docker build . I get the following error message:

Sending build context to Docker daemon  84.05MB
Step 1/4 : FROM openjdk:11-slim
 ---> 724512274dbb
Step 2/4 : COPY target/demo_api*.jar ./demo_api.jar
COPY failed: no source files were specified

Does anyone understand why I get this error and how I could fix it? Thanks in advance for your help

Answer 1

看起来应用程序（可能还有 jar 文件）被称为“demo-api”，但您在 Docker 文件中使用了下划线。

Answer 2

在您指定的 demo_api.jar 目标文件夹中删除 *。