有没有更简单的方法将 mysql 驱动程序加载到类路径？

Question

我正在尝试命令行类路径方法，但 docker run 不断给出类未找到错误？有没有更简单的方法将 mysql 驱动程序加载到类路径？

错误：

Error:Error: Could not find or load main class com.smartworks.client.RDSConnectionTest
Caused by: java.lang.ClassNotFoundException:

我的 Dockerfile：

FROM openjdk

COPY src src

WORKDIR src

RUN mkdir -p target

COPY target/mysql-connector-java-8.0.20.jar /target/

RUN javac ./com/smartworks/client/*.java

ENTRYPOINT ["java","-cp", "mysql-connector-java-8.0.20.jar:target/*","com.smartworks.client.RDSConnectionTest"]

Answer 1

FROM openjdk
COPY src . 
COPY target/mysql-connector-java-8.0.20.jar libs/
ENV CLASSPATH=libs/mysql-connector-java-8.0.20.jar:${CLASSPATH}
RUN javac /*.java
ENTRYPOINT ["java","RDSConnectionTest"]

Answer 2

我看到，你的Dockerfile有问题，请看下面的Dockerfile并根据它进行更改。

FROM openjdk

WORKDIR src # Good to define WORKDIR before any operation

COPY src . # As you are only copying src and change dest to Current directory which is src by default as WORKDIR is mentioned above

RUN mkdir -p target

RUN ls -lart #Add a debug to see if everyfile is present
COPY target/mysql-connector-java-8.0.20.jar target/ # Instead of /target , you have to copy to target

RUN javac ./com/smartworks/client/*.java 

#For Classpath
ENV CLASSPATH=libs/mysql-connector-java-8.0.20.jar:${CLASSPATH}

ENTRYPOINT ["java", "RDSConnectionTest"]