问题描述
您可能使用Spring Boot Maven插件（https://docs.spring.io/spring- boot/docs/current/reference/html/build-tool-plugins-maven- plugin.html）重新打包Jar，以生成一个可执行jar，但是它使用自定义引导布局，Apache Flink的内部类加载器@R_301_472@该自定义引导布局。您尝试部署的文件（.jar.original）旁边应该有一个原始的jar文件，您可以将其用于Flink群集上的部署。
或者，您可以使用另一种方式来生成具有所有依赖项的Jar，例如maven- shade（https://maven.apache.org/plugins/maven-shade- plugin/）
解决方法
我正在测试Apache Flink和Spring Boot之间的集成，可以在IDE上运行它们，但是当我尝试在Apache Flink
Cluster上运行时，我遇到了一个与ClassLoader相关的异常。
这些类非常简单：
BootFlinkApplication
@SpringBootApplication
@ComponentScan("com.example.demo")
public class BootFlinkApplication {
public static void main(String[] args) {
System.out.println("some test");
SpringApplication.run(BootFlinkApplication.class,args);
}
}
FlinkTest
@Service
public class FlinkTest {
@PostConstruct
public void init() {
StreamExecutionEnvironment see = StreamExecutionEnvironment.getExecutionEnvironment();
see.fromElements(1,2,3,4)
.filter(new RemoveNumber3Filter()).print();
try {
see.execute();
} catch (Exception e) {
System.out.println("Error executing flink job: " + e.getMessage());
}
}
}
RemoveNumber3Filter
public class RemoveNumber3Filter implements FilterFunction<Integer> {
@Override
public boolean filter(Integer i) throws Exception {
return i != 3;
}
}
例外：
Caused by: org.apache.flink.runtime.client.JobExecutionException: Job execution failed.
at org.apache.flink.runtime.jobmanager.JobManager$$anonfun$handleMessage$1$$anonfun$applyOrElse$6.apply$mcV$sp(JobManager.scala:897)
at org.apache.flink.runtime.jobmanager.JobManager$$anonfun$handleMessage$1$$anonfun$applyOrElse$6.apply(JobManager.scala:840)
at org.apache.flink.runtime.jobmanager.JobManager$$anonfun$handleMessage$1$$anonfun$applyOrElse$6.apply(JobManager.scala:840)
at scala.concurrent.impl.Future$PromiseCompletingRunnable.liftedTree1$1(Future.scala:24)
at scala.concurrent.impl.Future$PromiseCompletingRunnable.run(Future.scala:24)
at akka.dispatch.TaskInvocation.run(AbstractDispatcher.scala:39)
at akka.dispatch.ForkJoinExecutorConfigurator$AkkaForkJoinTask.exec(AbstractDispatcher.scala:415)
at scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)
at scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339)
at scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)
at scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)
Caused by: org.apache.flink.streaming.runtime.tasks.StreamTaskException: Cannot load user class: com.example.demo.RemoveNumber3Filter
ClassLoader info: URL ClassLoader:
file: '/tmp/blobStore-850f3189-807e-4f8d-a8a6-3bd3c1bd76b4/job_eb93b239080b4d4e09f10f1e3605744d/blob_p-5fd56f3348976c0d333d680fde4a79573c21cd40-48ac0995eee11f38ce3ff4f890102af8' (valid JAR)
Class not resolvable through given classloader.
at org.apache.flink.streaming.api.graph.StreamConfig.getStreamOperator(StreamConfig.java:232)
at org.apache.flink.streaming.runtime.tasks.OperatorChain.createChainedOperator(OperatorChain.java:355)
at org.apache.flink.streaming.runtime.tasks.OperatorChain.createOutputCollector(OperatorChain.java:282)
at org.apache.flink.streaming.runtime.tasks.OperatorChain.<init>(OperatorChain.java:126)
at org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:231)
at org.apache.flink.runtime.taskmanager.Task.run(Task.java:718)
at java.lang.Thread.run(Thread.java:748)