java - Docker未加载类路径

Question

我正在尝试连接到远程托管的mysql，但是docker run没有加载驱动程序，给出了classnotfounderror。

ClassNotFoundException: com.mysql.cj.jdbc.Driver
appreciate help! thanks.

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FROM java:8-jdk-alpine
RUN apk get update 
RUN apk --no-cache add curl
RUN curl -L -o /mysql-connector-java-5.1.34.jar https://repo1.maven.org/maven2/mysql/mysql-connector-java/5.1.34/mysql-connector-java-5.1.34.jar
COPY . /tmp
WORKDIR /tmp
EXPOSE 3307 3306
CMD ["java","-classpath","mysql-connector-java-5.1.34.jar:.","com.smartworks.JavaMySQLConnection"]

Answer 1

您的mysql连接器jar文件通过curl命令输出到root /mysql-connector-java-5.1.34.jar。

因此，当您在Java命令中使用-classpath引用它时，应使用相同的路径/ mysql-connector-java-5.1.34.jar

CMD ["java","-classpath","/mysql-connector-java-5.1.34.jar:.","com.smartworks.JavaMySQLConnection"]

那么，如果需要的话，为什么不通过 curl命令直接输出到/ tmp呢？

FROM java:8-jdk-alpine
RUN apk --update --no-cache add curl
RUN curl -L -o /tmp/mysql-connector-java-5.1.34.jar https://repo1.maven.org/maven2/mysql/mysql-connector-java/5.1.34/mysql-connector-java-5.1.34.jar
WORKDIR /tmp
EXPOSE 3307 3306
CMD ["java","-classpath","mysql-connector-java-5.1.34.jar:.","com.smartworks.JavaMySQLConnection"]