maven

1 简介

Maven 是一个项目管理工具，可以对 Java 项目进行构建、依赖管理。

2 安装配置

https://blog.csdn.net/qq_19734597/article/details/120996418

https://blog.csdn.net/weixin_34234829/article/details/89686175

https://blog.csdn.net/idomyway/article/details/81974677

1 更换镜像

conf/settings.xml

https://www.cnblogs.com/digdeep/p/5026066.html

https://blog.csdn.net/qq_42931492/article/details/107283590

2 网络配置

conf/settings.xml

https://blog.csdn.net/zongf0504/article/details/88797831

3 问题

(org.apache.maven.wagon.providers.http.httpclient.NoHttpResponseException) caught when processing request to {}->http://XXXXXX->http://maven.aliyun.com:80: The target server failed to respond

3 管理包

https://blog.51cto.com/u_15119353/3303815

1 设置setting.xml

2 编写pom

<dependencies>
    <dependency>
        <groupId>org.apache.flink</groupId>
        <artifactId>flink-java</artifactId>
        <version>1.10.1</version>
    </dependency>
    <dependency>
        <groupId>org.apache.flink</groupId>
        <artifactId>flink-streaming-java_2.12</artifactId>
        <version>1.10.1</version>
    </dependency>
    <dependency>
        <groupId>org.apache.flink</groupId>
        <artifactId>flink-connector-kafka-0.11_2.12</artifactId>
        <version>1.10.1</version>
    </dependency>
    <dependency>
        <groupId>org.apache.bahir</groupId>
        <artifactId>flink-connector-redis_2.11</artifactId>
        <version>1.0</version>
    </dependency>
    <dependency>
        <groupId>org.apache.flink</groupId>
        <artifactId>flink-connector-elasticsearch6_2.12</artifactId>
        <version>1.10.1</version>
    </dependency>
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>5.1.44</version>
    </dependency>
    <dependency>
        <groupId>org.apache.flink</groupId>
        <artifactId>flink-statebackend-rocksdb_2.12</artifactId>
        <version>1.10.1</version>
    </dependency>
    <dependency>
        <groupId>org.apache.flink</groupId>
        <artifactId>flink-table-planner_2.12</artifactId>
        <version>1.10.1</version>
    </dependency>
    <dependency>
        <groupId>org.apache.flink</groupId>
        <artifactId>flink-table-planner-blink_2.12</artifactId>
        <version>1.10.1</version>
    </dependency>
    <dependency>
        <groupId>org.apache.flink</groupId>
        <artifactId>flink-csv</artifactId>
        <version>1.10.1</version>
    </dependency>

</dependencies>

3 生成本地包的repository

默认位置在/user/.m2/repository，在setting可以修改

4 环境使用本地repository

https://blog.csdn.net/weixin_42476601/article/details/87884514

4 问题

1.com/atguigu/gmall/hive/udtf/ExplodeJSONArray has been compiled by a more recent version of the Java Runtime (class file version 55.0), this version of the Java Runtime only recognizes class file versions up to 52.0

解决：两边jdk版本对齐就好

打包时候注意要：maven clean,maven compile

class file versions对应jdk版本：

49 = Java 5
50 = Java 6
51 = Java 7
52 = Java 8
53 = Java 9
54 = Java 10
55 = Java 11
56 = Java 12
57 = Java 13
58 = Java 14

2.Unknown host maven.aliyun.com