在docker中启动helloWorld.java时出错

Question

我尝试在hava上创建helloWorld应用程序，然后在Windows的docker中启动它。

1. 我编写应用程序：

   public class HelloWorld {
       public static void main(String[] args) {
           System.out.println("Start... ");
           System.out.println("Hello Pavel!");
       }
   }
   

2. 我创建Docker文件：

   FROM java:8
   ADD HelloWorld.java .
   RUN javac HelloWorld.java
   CMD ["java", "HelloWorld"]
   

3. 我放入java-application文件夹中的文件：

   -java-application
   -HelloWorld.java
   -Dockerfile 
   

4. 我尝试构建它：

Pavel\java-application>docker build -t java-application .
Sending build context to Docker daemon  3.072kB
Step 1/4 : FROM java:8
 ---> d23bdf5b1b1b
Step 2/4 : ADD HelloWorld.java .
 ---> Using cache
 ---> d4e0c540b57b
Step 3/4 : RUN javac HelloWorld.java
 ---> Using cache
 ---> 5f5204f28710
Step 4/4 : CMD ["java", "HelloWorld"]
 ---> Using cache
 ---> 53ebab34502c
Successfully built 53ebab34502c
Successfully tagged java-application:latest
SECURITY WARNING: You are building a Docker image from Windows against a non-Windows Docker host. All files and directories added to build context will have '-rwxr-xr-x' permissions. It is recommended to double check and reset permissions for sensitive files and directories.

我显示了所有图像：

REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
java-application    latest              53ebab34502c        2 minutes ago       643MB
hello-world         latest              4ab4c602aa5e        8 days ago          1.84kB
ubuntu              latest              cd6d8154f1e1        9 days ago          84.1MB
nginx               latest              06144b287844        10 days ago         109MB
java                8                   d23bdf5b1b1b        20 months ago       643MB

1. 我尝试启动应用程序：

   C：\ Pavel \ java-application> docker运行Java应用程序 错误：找不到或加载主类HelloWorld

EDDIT

我更改dockerfile：

FROM openjdk:8
ADD HelloPavel.java .
RUN javac HelloPavel.java
ENTRYPOINT ["java", "HelloPavel"]

我有

hello-pavel         latest              c817bd40d62c        25 seconds ago      624MB

我开始：

C:\Pavel\hello-pavel>docker run hello-pavel:latest
Error: Could not find or load main class HelloPavel

Answer 1

错误非常清楚，类Helloworld不在docker内部的java类路径中。用

添加

java -cp . HelloPavel

当您第一次将目录更改为编译类所在的位置时。