java - 使用 Spark 和 Maven 运行项目

Question

这个问题已经有答案了:

Spark : Exception in thread "main" java.lang.ClassNotFoundException: com.mysql.jdbc.Driver (2 个回答)

Why am I getting a NoClassDefFoundError in Java? (31 个回答)

已关闭 6 年前。

我正在尝试运行我的类 java 来读取 GML 文件，并且我使用 Tinkerpop 和 GMLReader 来执行此操作，问题是当我尝试使用 Spark 运行它时，它给了我一个异常
我写了一个简单的代码进行测试:

 public static void main(String[] args) throws IOException {
    TinkerGraph graphs = new TinkerGraph();
    String in = "/home/salma/Desktop/celegansneural.gml";
    GMLReader.inputGraph(graphs, in);
    System.out.println(graphs);
 }

我用来运行该类的命令:

root@salma-SATELLITE-C855-1EQ:/usr/local/spark# ./bin/spark-submit --class graph_example.WordCount --master local[2] ~/workspace/graph_example/target/graph_example-0.0.1-SNAPSHOT.jar

错误:

Exception in thread "main" java.lang.NoClassDefFoundError:
 com/tinkerpop/blueprints/impls/tg/TinkerGraph
        at graph_example.WordCount.main(WordCount.java:51)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at org.apache.spark.deploy.SparkSubmit$.org$apache$spark$deploy$SparkSubmit$$runMain(SparkSubmit.scala:569)
        at org.apache.spark.deploy.SparkSubmit$.doRunMain$1(SparkSubmit.scala:166)
        at org.apache.spark.deploy.SparkSubmit$.submit(SparkSubmit.scala:189)
        at org.apache.spark.deploy.SparkSubmit$.main(SparkSubmit.scala:110)
        at org.apache.spark.deploy.SparkSubmit.main(SparkSubmit.scala)
     Caused by: java.lang.ClassNotFoundException: com.tinkerpop.blueprints.impls.tg.TinkerGraph
        at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
        ... 10 more
     Using Spark's default log4j profile: org/apache/spark/log4j-defaults.properties

Answer 1

您必须提供包含 TinkerGraph 实现的依赖项。如果我没记错的话，你需要提供this jar

然后像往常一样运行 spark-submit 但使用 --jars/some/location/blueprints-core-2.6.0.jar

official documentation中有解释:

When using spark-submit, the application jar along with any jars included with the --jars option will be automatically transferred to the cluster.