[TOC]
一、问题引入
本来是想使用 Alink 做一下情感分析的,于是从 Maven 仓库搜了下 Alink 的 Maven 依赖,如下: 于是乎,直接复制到了项目的 pom.xml 中,并添加了 Flink 的依赖,如下: 运行官方例子出现:
- NoClassDefFoundError: com/alibaba/alink/pipeline/PipelineStageBase
- java.lang.ClassNotFoundException: com.alibaba.alink.pipeline.PipelineStageBase
- Error: A JNI error has occurred, please check your installation and try again
java.lang.NoClassDefFoundError: com/alibaba/alink/pipeline/PipelineStageBase
at java.lang.Class.getDeclaredMethods0(Native Method)
at java.lang.Class.privateGetDeclaredMethods(Class.java:2701)
at java.lang.Class.privateGetMethodRecursive(Class.java:3048)
at java.lang.Class.getMethod0(Class.java:3018)
at java.lang.Class.getMethod(Class.java:1784)
at sun.launcher.LauncherHelper.validateMainClass(LauncherHelper.java:544)
at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:526)
Caused by: java.lang.ClassNotFoundException: com.alibaba.alink.pipeline.PipelineStageBase
at java.net.URLClassLoader.findClass(URLClassLoader.java:382)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 7 more
Error: A JNI error has occurred, please check your installation and try again
Exception in thread "main"
二、问题解决
于是,查看了 Alink 使用指南:www.yuque.com/pinshu/alin…,即文章:使用 Maven 快速构建 Alink Java 项目, 初次看,没发现我的依赖有任何问题,找了很久,发现 Maven 仓库复制的依赖与官方文档相比多了依赖范围的指定,如下: 去掉依赖范围后,运行官方例子,如下: 添加依赖,运行成功,如下:
<dependency>
<groupId>org.apache.flink</groupId>
<artifactId>flink-clients_2.11</artifactId>
<version>1.12.0</version>
</dependency>
附:项目依赖
<dependencies>
<!-- https://mvnrepository.com/artifact/com.alibaba.alink/alink_core_flink-1.12 -->
<dependency>
<groupId>com.alibaba.alink</groupId>
<artifactId>alink_core_flink-1.12_2.11</artifactId>
<version>1.3.2</version>
</dependency>
<dependency>
<groupId>org.apache.flink</groupId>
<artifactId>flink-streaming-java_2.11</artifactId>
<version>1.12.0</version>
</dependency>
<dependency>
<groupId>org.apache.flink</groupId>
<artifactId>flink-streaming-scala_2.11</artifactId>
<version>1.12.0</version>
</dependency>
<dependency>
<groupId>org.apache.flink</groupId>
<artifactId>flink-table-planner_2.11</artifactId>
<version>1.12.0</version>
</dependency>
<dependency>
<groupId>org.apache.flink</groupId>
<artifactId>flink-clients_2.11</artifactId>
<version>1.12.0</version>
</dependency>
<!-- https://mvnrepository.com/artifact/com.hankcs/hanlp -->
<dependency>
<groupId>com.hankcs</groupId>
<artifactId>hanlp</artifactId>
<version>portable-1.7.6</version>
</dependency>
</dependencies>
三、其它
根据出现的问题,特意了解了一下 Maven 的依赖范围,以免之后出现依赖范围导致的问题,如果不了解的话,建议了解一下,如下:
花费了近一天,算是解决了,Maven 有待了解,完结!!!!!!!