[Java SE] java.lang.AbstractMethodError: XxxClass.xxxx:V(找不到抽象方法的具体实现方法)

问题描述

• Flink Job 运行时，报如下错误:

Flink 1.15 / Java = 1.8

...
2025-03-16 22:14:08,100 INFO  org.apache.flink.runtime.executiongraph.ExecutionGraph       1424 [flink-akka.actor.default-dispatcher-4]  - Source: vehicle-log-event-config-data-stream-source (1/1) (c3d67b2af56xxxxxxxba031aec3936c3) switched from RUNNING to FAILED on flink-xxx-taskmanager-1-1-fe5b746b-38ce-4891-bde8-fda32d64e0a9 @ xxx.xx.xx.xxx (dataPort=38200).
java.lang.AbstractMethodError: com.xxx.xxx.analysis.cdc.mysql.XxxEventConfigDeserializationSchema.deserialize(Lcom/ververica/cdc/connectors/shaded/org/apache/kafka/connect/source/SourceRecord;Lorg/apache/flink/util/Collector;)V
	at com.ververica.cdc.connectors.mysql.source.reader.MySqlRecordEmitter.emitElement(MySqlRecordEmitter.java:129) ~[flink-sql-connector-mysql-cdc-2.4.0-h0.cbu.mrs.330.r1-SNAPSHOT.jar:2.4.0-h0.cbu.mrs.330.r1-SNAPSHOT]
	at com.ververica.cdc.connectors.mysql.source.reader.MySqlRecordEmitter.processElement(MySqlRecordEmitter.java:111) ~[flink-sql-connector-mysql-cdc-2.4.0-h0.cbu.mrs.330.r1-SNAPSHOT.jar:2.4.0-h0.cbu.mrs.330.r1-SNAPSHOT]
	at com.ververica.cdc.connectors.mysql.source.reader.MySqlRecordEmitter.emitRecord(MySqlRecordEmitter.java:83) ~[flink-sql-connector-mysql-cdc-2.4.0-h0.cbu.mrs.330.r1-SNAPSHOT.jar:2.4.0-h0.cbu.mrs.330.r1-SNAPSHOT]
	at com.ververica.cdc.connectors.mysql.source.reader.MySqlRecordEmitter.emitRecord(MySqlRecordEmitter.java:55) ~[flink-sql-connector-mysql-cdc-2.4.0-h0.cbu.mrs.330.r1-SNAPSHOT.jar:2.4.0-h0.cbu.mrs.330.r1-SNAPSHOT]
	at org.apache.flink.connector.base.source.reader.SourceReaderBase.pollNext(SourceReaderBase.java:143) ~[flink-connector-files-1.15.0-h0.cbu.dli.330.20241021.r34.jar:1.15.0-h0.cbu.dli.330.20241021.r34]
	at org.apache.flink.streaming.api.operators.SourceOperator.emitNext(SourceOperator.java:386) ~[flink-dist-1.15.0-h0.cbu.dli.330.20241021.r34.jar:1.15.0-h0.cbu.dli.330.20241021.r34]
	at org.apache.flink.streaming.runtime.io.StreamTaskSourceInput.emitNext(StreamTaskSourceInput.java:68) ~[flink-dist-1.15.0-h0.cbu.dli.330.20241021.r34.jar:1.15.0-h0.cbu.dli.330.20241021.r34]
	at org.apache.flink.streaming.runtime.io.StreamOneInputProcessor.processInput(StreamOneInputProcessor.java:65) ~[flink-dist-1.15.0-h0.cbu.dli.330.20241021.r34.jar:1.15.0-h0.cbu.dli.330.20241021.r34]
	at org.apache.flink.streaming.runtime.tasks.StreamTask.processInput(StreamTask.java:539) ~[flink-dist-1.15.0-h0.cbu.dli.330.20241021.r34.jar:1.15.0-h0.cbu.dli.330.20241021.r34]
	at org.apache.flink.streaming.runtime.tasks.mailbox.MailboxProcessor.runMailboxLoop(MailboxProcessor.java:216) ~[flink-dist-1.15.0-h0.cbu.dli.330.20241021.r34.jar:1.15.0-h0.cbu.dli.330.20241021.r34]
	at org.apache.flink.streaming.runtime.tasks.StreamTask.runMailboxLoop(StreamTask.java:829) ~[flink-dist-1.15.0-h0.cbu.dli.330.20241021.r34.jar:1.15.0-h0.cbu.dli.330.20241021.r34]
	at org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:778) ~[flink-dist-1.15.0-h0.cbu.dli.330.20241021.r34.jar:1.15.0-h0.cbu.dli.330.20241021.r34]
	at org.apache.flink.runtime.taskmanager.Task.runWithSystemExitMonitoring(Task.java:958) ~[flink-dist-1.15.0-h0.cbu.dli.330.20241021.r34.jar:1.15.0-h0.cbu.dli.330.20241021.r34]
	at org.apache.flink.runtime.taskmanager.Task.restoreAndInvoke(Task.java:937) ~[flink-dist-1.15.0-h0.cbu.dli.330.20241021.r34.jar:1.15.0-h0.cbu.dli.330.20241021.r34]
	at org.apache.flink.runtime.taskmanager.Task.doRun(Task.java:751) ~[flink-dist-1.15.0-h0.cbu.dli.330.20241021.r34.jar:1.15.0-h0.cbu.dli.330.20241021.r34]
	at org.apache.flink.runtime.taskmanager.Task.run(Task.java:573) ~[flink-dist-1.15.0-h0.cbu.dli.330.20241021.r34.jar:1.15.0-h0.cbu.dli.330.20241021.r34]
	at java.lang.Thread.run(Thread.java:750) ~[?:1.8.0_422]
...

原因分析

• Flink 应用程序的XxxEventConfigDeserializationSchema#deserialize源码中的方法是：

import com.alibaba.fastjson.JSONObject;
import com.alibaba.ververica.cdc.debezium.DebeziumDeserializationSchema;
import io.debezium.data.Envelope;
import lombok.extern.slf4j.Slf4j;
import org.apache.flink.api.common.typeinfo.BasicTypeInfo;
import org.apache.flink.api.common.typeinfo.TypeInformation;
import org.apache.flink.util.Collector;
import org.apache.kafka.connect.data.Field;
import org.apache.kafka.connect.data.Schema;
import org.apache.kafka.connect.data.Struct;
import org.apache.kafka.connect.source.SourceRecord;//和日志的的 SourceRecord 路径(com/ververica/cdc/connectors/shaded/org/apache/kafka/connect/source/SourceRecord)，不一致

@Slf4j
public class LogEventConfigDeserializationSchema implements DebeziumDeserializationSchema<String> {
    @Override
    public void deserialize(SourceRecord sourceRecord, Collector<String> collector) throws Exception {
        ...
    }

    //...
}

• java.lang.AbstractMethodError通常在尝试调用一个抽象方法的实现时抛出，但是该实现在运行时并未被找到。

这个错误大多发生在接口或者抽象类有改动之后、或包冲突(包版本不匹配)，依赖它们的实现类没有相应更新的情况下。

解决方法

• 更换正确版本的JAR包

<dependency>
    <groupId>com.alibaba.ververica</groupId>
    <artifactId>flink-connector-mysql-cdc</artifactId>
</dependency>

Y 推荐文献

• Java 经典问题：解决JAR包冲突 - 博客园/千千寰宇

X 参考文献

• 已解决java.lang.AbstractMethodError: 抽象方法错误的正确解决方法，亲测有效！！！ - CSDN