<eloquentjavascript>Values, Types, and Operators

最新推荐文章于 2024-05-28 09:25:21 发布
原创 最新推荐文章于 2024-05-28 09:25:21 发布 · 236 阅读 · 0 ·
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本文介绍了JavaScript中数字的存储方式及一些实用的操作技巧，包括如何使用固定位数存储数字、比较值是否为null或undefined，以及如何利用isNaN函数验证参数是否为非数字。

Numbers

JavaScript uses a fixed number of bits, namely 64 of them, to store a single number value.

compare

  • when null or undefined occurs on either side of the operator, it produces true only if both sides are one of null or undefined..When you want to test whether a value has a real value instead of null or undefined, you can simply compare it to null with the == (or !=) operator.
  • The isNaN function is a standard JavaScript function that returns true only if the argument it is given is NaN.
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<?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.crmp.ecc</groupId> <artifactId>crmp-data-syncjob</artifactId> <packaging>pom</packaging> <version>1.0.0-SNAPSHOT</version> <modules> <module>crmp-data-syncjob-common</module> <module>crmp-data-syncjob-dao</module> <module>crmp-data-syncjob-domain</module> <module>crmp-data-syncjob-service</module> <module>crmp-data-syncjob-web</module> </modules> <name>多数据源同步服务</name> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.7.18</version> <relativePath/> </parent> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding> <java.version>11</java.version> <!-- 框架版本 --> <flink.version>1.19.3</flink.version> <flink-cdc.version>3.2.0</flink-cdc.version> <debezium.version>1.9.8.Final</debezium.version> <scala.binary.version>2.12</scala.binary.version> <!-- 数据库与中间件依赖 --> <mysql.version>8.0.21</mysql.version> <druid.version>1.2.21</druid.version> <mybatis.version>2.3.1</mybatis.version> <kafka-clients.version>2.6.2</kafka-clients.version> <!-- 工具类与文档 --> <lombok.version>1.18.30</lombok.version> <hutool.version>5.8.6</hutool.version> <commons-lang3.version>3.14.0</commons-lang3.version> <!-- 统一SLF4J版本（与Flink 1.19.3兼容） --> <slf4j.version>1.7.36</slf4j.version> <!-- Infinispan统一版本（避免传递依赖冲突） --> <infinispan.version>13.0.20.Final</infinispan.version> </properties> <!-- 依赖管理：统一锁定版本，优先级：BOM > 显式声明 --> <dependencyManagement> <dependencies> <!-- 1. Debezium BOM：优先锁定所有Debezium子依赖版本（包括传递依赖） --> <dependency> <groupId>io.debezium</groupId> <artifactId>debezium-bom</artifactId> <version>${debezium.version}</version> <type>pom</type> <scope>import</scope> </dependency> <!-- 2. Spring Cloud 依赖（与Spring Boot 2.7.18兼容） --> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-dependencies</artifactId> <version>2021.0.8</version> <type>pom</type> <scope>import</scope> </dependency> <!-- 3. 核心依赖版本锁定 --> <dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-api</artifactId> <version>${slf4j.version}</version> </dependency> <dependency> <groupId>org.infinispan</groupId> <artifactId>infinispan-commons</artifactId> <version>${infinispan.version}</version> </dependency> <!-- 4. 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Flink CDC组件 --> <dependency> <groupId>com.ververica</groupId> <artifactId>flink-connector-mysql-cdc</artifactId> <version>${flink-cdc.version}</version> </dependency> <dependency> <groupId>com.ververica</groupId> <artifactId>flink-connector-oracle-cdc</artifactId> <version>${flink-cdc.version}</version> </dependency> <!-- 6. 子模块版本管理 --> <dependency> <groupId>com.crmp.ecc</groupId> <artifactId>crmp-data-syncjob-common</artifactId> <version>${project.version}</version> </dependency> <dependency> <groupId>com.crmp.ecc</groupId> <artifactId>crmp-data-syncjob-dao</artifactId> <version>${project.version}</version> </dependency> <dependency> <groupId>com.crmp.ecc</groupId> <artifactId>crmp-data-syncjob-domain</artifactId> <version>${project.version}</version> </dependency> <dependency> <groupId>com.crmp.ecc</groupId> <artifactId>crmp-data-syncjob-service</artifactId> <version>${project.version}</version> </dependency> </dependencies> </dependencyManagement> <dependencies> <!-- ========== Spring Boot核心：排除日志冲突 ========== --> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> <exclusions> <exclusion> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-logging</artifactId> </exclusion> </exclusions> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-aop</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-log4j2</artifactId> <exclusions> <exclusion> <groupId>org.slf4j</groupId> <artifactId>slf4j-reload4j</artifactId> </exclusion> </exclusions> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-configuration-processor</artifactId> <optional>true</optional> </dependency> <!-- ========== 测试依赖 ========== --> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> <exclusions> <exclusion> <groupId>org.junit.vintage</groupId> <artifactId>junit-vintage-engine</artifactId> </exclusion> </exclusions> </dependency> <!-- ========== 工具类 ========== --> <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> <version>${lombok.version}</version> <scope>provided</scope> </dependency> <dependency> <groupId>cn.hutool</groupId> <artifactId>hutool-all</artifactId> <version>${hutool.version}</version> </dependency> <dependency> <groupId>org.apache.commons</groupId> <artifactId>commons-lang3</artifactId> <version>${commons-lang3.version}</version> </dependency> <dependency> <groupId>commons-codec</groupId> <artifactId>commons-codec</artifactId> <version>1.16.0</version> </dependency> <!-- ========== 数据库依赖 ========== --> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>${mysql.version}</version> </dependency> <dependency> <groupId>com.alibaba</groupId> <artifactId>druid-spring-boot-starter</artifactId> <version>${druid.version}</version> <exclusions> <exclusion> <groupId>com.alibaba</groupId> <artifactId>dubbo</artifactId> </exclusion> <exclusion> <groupId>com.googlecode</groupId> <artifactId>hibernate-memcached</artifactId> </exclusion> </exclusions> </dependency> <dependency> <groupId>org.mybatis.spring.boot</groupId> <artifactId>mybatis-spring-boot-starter</artifactId> <version>${mybatis.version}</version> </dependency> <!-- Oracle驱动 --> <dependency> <groupId>com.oracle.database.jdbc</groupId> <artifactId>ojdbc10</artifactId> <version>19.10.0.0</version> <scope>runtime</scope> </dependency> <dependency> <groupId>com.oracle.database.nls</groupId> <artifactId>orai18n</artifactId> <version>19.10.0.0</version> </dependency> <!-- 人大金仓 --> <dependency> <groupId>com.kingbase8.jdbc</groupId> <artifactId>kingbase8</artifactId> <version>8.6.0</version> <scope>runtime</scope> </dependency> <!-- ========== Flink核心依赖 ========== --> <dependency> <groupId>org.apache.flink</groupId> <artifactId>flink-clients</artifactId> <version>${flink.version}</version> <scope>provided</scope> </dependency> <dependency> <groupId>org.apache.flink</groupId> <artifactId>flink-table-api-java-bridge</artifactId> <version>${flink.version}</version> <scope>provided</scope> </dependency> <dependency> <groupId>org.apache.flink</groupId> <artifactId>flink-table-planner_${scala.binary.version}</artifactId> <version>${flink.version}</version> <scope>provided</scope> </dependency> <dependency> <groupId>org.apache.flink</groupId> <artifactId>flink-statebackend-rocksdb</artifactId> <version>${flink.version}</version> <scope>provided</scope> </dependency> <dependency> <groupId>org.apache.flink</groupId> <artifactId>flink-json</artifactId> <version>${flink.version}</version> <scope>provided</scope> </dependency> <dependency> <groupId>com.google.guava</groupId> <artifactId>guava</artifactId> <version>31.1-jre</version> <scope>provided</scope> </dependency> <!-- ========== CDC连接器（核心修改：排除Infinispan-jdk11依赖） ========== --> <!-- Mysql CDC：排除传递的Debezium和Infinispan问题依赖 --> <dependency> <groupId>com.ververica</groupId> <artifactId>flink-connector-mysql-cdc</artifactId> <exclusions> <exclusion> <groupId>org.apache.flink</groupId> <artifactId>flink-core</artifactId> </exclusion> <exclusion> <groupId>org.apache.kafka</groupId> <artifactId>kafka-clients</artifactId> </exclusion> <exclusion> <groupId>org.apache.flink</groupId> <artifactId>flink-streaming-java</artifactId> </exclusion> <exclusion> <groupId>io.debezium</groupId> <artifactId>*</artifactId> </exclusion> <exclusion> <groupId>ch.qos.logback</groupId> <artifactId>logback-classic</artifactId> </exclusion> <!-- 排除Flink CDC传递的Infinispan问题依赖 --> <exclusion> <groupId>org.infinispan</groupId> <artifactId>infinispan-commons-jdk11</artifactId> </exclusion> </exclusions> </dependency> <!-- Oracle CDC：排除传递的Debezium和Infinispan问题依赖 --> <dependency> <groupId>com.ververica</groupId> <artifactId>flink-connector-oracle-cdc</artifactId> <exclusions> <exclusion> <groupId>org.apache.flink</groupId> <artifactId>flink-core</artifactId> </exclusion> <exclusion> <groupId>io.debezium</groupId> <artifactId>*</artifactId> </exclusion> <exclusion> <groupId>ch.qos.logback</groupId> <artifactId>logback-classic</artifactId> </exclusion> <exclusion> <groupId>org.infinispan</groupId> <artifactId>infinispan-commons-jdk11</artifactId> </exclusion> </exclusions> </dependency> <!-- 人大金仓CDC：排除传递的Debezium依赖 --> <dependency> <groupId>com.kingbase</groupId> <artifactId>flink-sql-cdc-connector-kes-v2</artifactId> <version>3.2-SNAPSHOT</version> <exclusions> <exclusion> <groupId>io.debezium</groupId> <artifactId>*</artifactId> </exclusion> <exclusion> <groupId>org.infinispan</groupId> <artifactId>infinispan-commons-jdk11</artifactId> </exclusion> </exclusions> </dependency> <!-- ========== 显式引入Debezium核心组件（版本由dependencyManagement锁定） ========== --> <dependency> <groupId>io.debezium</groupId> <artifactId>debezium-core</artifactId> </dependency> <dependency> <groupId>io.debezium</groupId> <artifactId>debezium-connector-mysql</artifactId> </dependency> <dependency> <groupId>io.debezium</groupId> <artifactId>debezium-connector-oracle</artifactId> </dependency> <!-- ========== Flink补充依赖 ========== --> <dependency> <groupId>org.apache.flink</groupId> <artifactId>flink-core</artifactId> <version>${flink.version}</version> <scope>provided</scope> </dependency> <dependency> <groupId>org.apache.flink</groupId> <artifactId>flink-streaming-java</artifactId> <version>${flink.version}</version> <exclusions> <exclusion> <groupId>org.apache.commons</groupId> <artifactId>commons-math3</artifactId> </exclusion> </exclusions> <scope>provided</scope> </dependency> <dependency> <groupId>org.apache.commons</groupId> <artifactId>commons-math3</artifactId> <version>3.6.1</version> </dependency> <dependency> <groupId>org.apache.flink</groupId> <artifactId>flink-connector-base</artifactId> <version>${flink.version}</version> </dependency> <!-- ========== Kafka依赖 ========== --> <dependency> <groupId>org.apache.flink</groupId> <artifactId>flink-connector-kafka</artifactId> <version>3.2.0-1.19</version> <exclusions> <exclusion> <groupId>org.apache.kafka</groupId> <artifactId>kafka-clients</artifactId> </exclusion> </exclusions> </dependency> <dependency> <groupId>org.apache.kafka</groupId> <artifactId>kafka-clients</artifactId> <version>${kafka-clients.version}</version> </dependency> <dependency> <groupId>org.apache.kafka</groupId> <artifactId>connect-api</artifactId> <version>${kafka-clients.version}</version> <exclusions> <exclusion> <groupId>org.apache.kafka</groupId> <artifactId>kafka-clients</artifactId> </exclusion> <exclusion> <groupId>org.slf4j</groupId> <artifactId>slf4j-api</artifactId> </exclusion> </exclusions> </dependency> <dependency> <groupId>org.apache.kafka</groupId> <artifactId>connect-json</artifactId> <version>${kafka-clients.version}</version> <exclusions> <exclusion> <groupId>org.apache.kafka</groupId> <artifactId>kafka-clients</artifactId> </exclusion> <exclusion> <groupId>org.slf4j</groupId> <artifactId>slf4j-api</artifactId> </exclusion> </exclusions> </dependency> <dependency> <groupId>org.apache.kafka</groupId> <artifactId>connect-transforms</artifactId> <version>${kafka-clients.version}</version> <exclusions> <exclusion> <groupId>org.apache.kafka</groupId> <artifactId>kafka-clients</artifactId> </exclusion> <exclusion> <groupId>org.slf4j</groupId> <artifactId>slf4j-api</artifactId> </exclusion> </exclusions> </dependency> <!-- ========== Doris连接器 ========== --> <dependency> <groupId>org.apache.doris</groupId> <artifactId>flink-doris-connector-1.19</artifactId> <version>25.1.0</version> <exclusions> <exclusion> <groupId>org.slf4j</groupId> <artifactId>slf4j-api</artifactId> </exclusion> <exclusion> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-databind</artifactId> </exclusion> </exclusions> </dependency> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-databind</artifactId> <version>2.12.7</version> </dependency> <!-- ========== Hadoop支持 ========== --> <dependency> <groupId>org.apache.flink</groupId> <artifactId>flink-hadoop-compatibility_2.12</artifactId> <version>${flink.version}</version> <scope>provided</scope> </dependency> <dependency> <groupId>org.apache.hadoop</groupId> <artifactId>hadoop-hdfs</artifactId> <version>3.3.6</version> <scope>provided</scope> <exclusions> <exclusion> <groupId>org.slf4j</groupId> <artifactId>slf4j-log4j12</artifactId> </exclusion> <exclusion> <groupId>log4j</groupId> <artifactId>log4j</artifactId> </exclusion> <exclusion> <groupId>org.apache.yetus</groupId> <artifactId>audience-annotations</artifactId> </exclusion> </exclusions> </dependency> <dependency> <groupId>org.apache.hadoop</groupId> <artifactId>hadoop-common</artifactId> <version>3.3.6</version> <scope>provided</scope> <exclusions> <exclusion> <groupId>org.slf4j</groupId> <artifactId>slf4j-log4j12</artifactId> </exclusion> <exclusion> <groupId>log4j</groupId> <artifactId>log4j</artifactId> </exclusion> <exclusion> <groupId>org.apache.yetus</groupId> <artifactId>audience-annotations</artifactId> </exclusion> </exclusions> </dependency> <!-- ========== 其他工具依赖 ========== --> <dependency> <groupId>com.alibaba</groupId> <artifactId>fastjson</artifactId> <version>2.0.39</version> </dependency> <dependency> <groupId>javax.servlet</groupId> <artifactId>javax.servlet-api</artifactId> <version>3.1.0</version> <scope>provided</scope> </dependency> <dependency> <groupId>com.github.pagehelper</groupId> <artifactId>pagehelper</artifactId> <version>5.3.2</version> </dependency> <dependency> <groupId>org.json</groupId> <artifactId>json</artifactId> <version>20231013</version> </dependency> </dependencies> <!-- 环境配置 --> <profiles> <profile> <id>dev</id> <activation> <activeByDefault>false</activeByDefault> </activation> <properties> <profileActive>dev</profileActive> </properties> </profile> <profile> <id>prod</id> <activation> <activeByDefault>true</activeByDefault> </activation> <properties> <profileActive>prod</profileActive> </properties> </profile> </profiles> </project>这是配置，这还是报错 2025-11-25 14:34:23 java.lang.NoSuchMethodError: 'io.debezium.config.Field io.debezium.config.Field.withType(org.apache.kafka.common.config.ConfigDef$Type)' at io.debezium.relational.HistorizedRelationalDatabaseConnectorConfig.<clinit>(HistorizedRelationalDatabaseConnectorConfig.java:48) at io.debezium.relational.RelationalDatabaseConnectorConfig.lambda$new$0(RelationalDatabaseConnectorConfig.java:636) at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:176) at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177) at java.base/java.util.HashMap$KeySpliterator.forEachRemaining(HashMap.java:1810) at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484) at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474) at java.base/java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:913) at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) at java.base/java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:578) at io.debezium.config.Configuration$5.keys(Configuration.java:1608) at io.debezium.config.Configuration$5.keys(Configuration.java:1605) at io.debezium.config.Configuration.map(Configuration.java:1567) at io.debezium.config.Configuration.subset(Configuration.java:1553) at io.debezium.relational.RelationalDatabaseConnectorConfig.<init>(RelationalDatabaseConnectorConfig.java:638) at io.debezium.connector.kes.KingbaseConnectorConfig.<init>(KingbaseConnectorConfig.java:1024) at org.apache.flink.cdc.connectors.kes.source.config.KingbaseSourceConfig.getDbzConnectorConfig(KingbaseSourceConfig.java:129) at org.apache.flink.cdc.connectors.kes.source.config.KingbaseSourceConfig.getDbzConnectorConfig(KingbaseSourceConfig.java:35) at org.apache.flink.cdc.connectors.base.config.JdbcSourceConfig.getTableFilters(JdbcSourceConfig.java:165) at org.apache.flink.cdc.connectors.kes.source.KingbaseDialect.isIncludeDataCollection(KingbaseDialect.java:219) at org.apache.flink.cdc.connectors.kes.source.KingbaseDialect.isIncludeDataCollection(KingbaseDialect.java:59) at org.apache.flink.cdc.connectors.base.source.reader.IncrementalSourceReader.addSplits(IncrementalSourceReader.java:266) at org.apache.flink.cdc.connectors.base.source.reader.IncrementalSourceReader.addSplits(IncrementalSourceReader.java:248) at org.apache.flink.streaming.api.operators.SourceOperator.handleAddSplitsEvent(SourceOperator.java:625) at org.apache.flink.streaming.api.operators.SourceOperator.handleOperatorEvent(SourceOperator.java:595) at org.apache.flink.streaming.runtime.tasks.OperatorEventDispatcherImpl.dispatchEventToHandlers(OperatorEventDispatcherImpl.java:72) at org.apache.flink.streaming.runtime.tasks.RegularOperatorChain.dispatchOperatorEvent(RegularOperatorChain.java:80) at org.apache.flink.streaming.runtime.tasks.StreamTask.lambda$dispatchOperatorEvent$22(StreamTask.java:1548) at org.apache.flink.streaming.runtime.tasks.StreamTaskActionExecutor$1.runThrowing(StreamTaskActionExecutor.java:50) at org.apache.flink.streaming.runtime.tasks.mailbox.Mail.run(Mail.java:90) at org.apache.flink.streaming.runtime.tasks.mailbox.MailboxProcessor.runMail(MailboxProcessor.java:398) at org.apache.flink.streaming.runtime.tasks.mailbox.MailboxProcessor.processMailsWhenDefaultActionUnavailable(MailboxProcessor.java:367) at org.apache.flink.streaming.runtime.tasks.mailbox.MailboxProcessor.processMail(MailboxProcessor.java:352) at org.apache.flink.streaming.runtime.tasks.mailbox.MailboxProcessor.runMailboxLoop(MailboxProcessor.java:229) at org.apache.flink.streaming.runtime.tasks.StreamTask.runMailboxLoop(StreamTask.java:917) at org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:859) at org.apache.flink.runtime.taskmanager.Task.runWithSystemExitMonitoring(Task.java:958) at org.apache.flink.runtime.taskmanager.Task.restoreAndInvoke(Task.java:937) at org.apache.flink.runtime.taskmanager.Task.doRun(Task.java:751) at org.apache.flink.runtime.taskmanager.Task.run(Task.java:566) at java.base/java.lang.Thread.run(Thread.java:829) 2025-11-25 15:12:28 java.lang.NoClassDefFoundError: Could not initialize class io.debezium.relational.HistorizedRelationalDatabaseConnectorConfig at io.debezium.relational.RelationalDatabaseConnectorConfig.lambda$new$0(RelationalDatabaseConnectorConfig.java:636) at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:176) at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177) at java.base/java.util.HashMap$KeySpliterator.forEachRemaining(HashMap.java:1810) at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484) at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474) at java.base/java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:913) at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) at java.base/java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:578) at io.debezium.config.Configuration$5.keys(Configuration.java:1608) at io.debezium.config.Configuration$5.keys(Configuration.java:1605) at io.debezium.config.Configuration.map(Configuration.java:1567) at io.debezium.config.Configuration.subset(Configuration.java:1553) at io.debezium.relational.RelationalDatabaseConnectorConfig.<init>(RelationalDatabaseConnectorConfig.java:638) at io.debezium.connector.kes.KingbaseConnectorConfig.<init>(KingbaseConnectorConfig.java:1024) at org.apache.flink.cdc.connectors.kes.source.config.KingbaseSourceConfig.getDbzConnectorConfig(KingbaseSourceConfig.java:129) at org.apache.flink.cdc.connectors.kes.source.config.KingbaseSourceConfig.getDbzConnectorConfig(KingbaseSourceConfig.java:35) at org.apache.flink.cdc.connectors.base.config.JdbcSourceConfig.getTableFilters(JdbcSourceConfig.java:165) at org.apache.flink.cdc.connectors.kes.source.KingbaseDialect.isIncludeDataCollection(KingbaseDialect.java:219) at org.apache.flink.cdc.connectors.kes.source.KingbaseDialect.isIncludeDataCollection(KingbaseDialect.java:59) at org.apache.flink.cdc.connectors.base.source.reader.IncrementalSourceReader.addSplits(IncrementalSourceReader.java:266) at org.apache.flink.cdc.connectors.base.source.reader.IncrementalSourceReader.addSplits(IncrementalSourceReader.java:248) at org.apache.flink.streaming.api.operators.SourceOperator.handleAddSplitsEvent(SourceOperator.java:625) at org.apache.flink.streaming.api.operators.SourceOperator.handleOperatorEvent(SourceOperator.java:595) at org.apache.flink.streaming.runtime.tasks.OperatorEventDispatcherImpl.dispatchEventToHandlers(OperatorEventDispatcherImpl.java:72) at org.apache.flink.streaming.runtime.tasks.RegularOperatorChain.dispatchOperatorEvent(RegularOperatorChain.java:80) at org.apache.flink.streaming.runtime.tasks.StreamTask.lambda$dispatchOperatorEvent$22(StreamTask.java:1548) at org.apache.flink.streaming.runtime.tasks.StreamTaskActionExecutor$1.runThrowing(StreamTaskActionExecutor.java:50) at org.apache.flink.streaming.runtime.tasks.mailbox.Mail.run(Mail.java:90) at org.apache.flink.streaming.runtime.tasks.mailbox.MailboxProcessor.runMail(MailboxProcessor.java:398) at org.apache.flink.streaming.runtime.tasks.mailbox.MailboxProcessor.processMailsWhenDefaultActionUnavailable(MailboxProcessor.java:367) at org.apache.flink.streaming.runtime.tasks.mailbox.MailboxProcessor.processMail(MailboxProcessor.java:352) at org.apache.flink.streaming.runtime.tasks.mailbox.MailboxProcessor.runMailboxLoop(MailboxProcessor.java:229) at org.apache.flink.streaming.runtime.tasks.StreamTask.runMailboxLoop(StreamTask.java:917) at org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:859) at org.apache.flink.runtime.taskmanager.Task.runWithSystemExitMonitoring(Task.java:958) at org.apache.flink.runtime.taskmanager.Task.restoreAndInvoke(Task.java:937) at org.apache.flink.runtime.taskmanager.Task.doRun(Task.java:751) at org.apache.flink.runtime.taskmanager.Task.run(Task.java:566) at java.base/java.lang.Thread.run(Thread.java:829) 这问题能不能解决了？
最新发布
11-26
<think> 根据用户提供的错误信息和项目配置，核心问题在于Debezium和Kafka客户端版本不兼容。Debezium 1.9.8.Final需要Kafka客户端2.6.x版本，但项目中使用了2.8.1版本，导致类初始化失败。 ### 解决方案 #### 步骤1：降低Kafka客户端版本 在Maven的`<properties>`中将Kafka客户端版本降级到2.6.2（与Debezium 1.9.8兼容）： ```xml <properties> <kafka-clients.version>2.6.2</kafka-clients.version> </properties> ``` #### 步骤2：确保所有模块使用统一版本 在父POM的`<dependencyManagement>`中显式锁定Kafka客户端版本： ```xml <dependencyManagement> <dependencies> <!-- 锁定Kafka客户端版本 --> <dependency> <groupId>org.apache.kafka</groupId> <artifactId>kafka-clients</artifactId> <version>${kafka-clients.version}</version> </dependency> </dependencies> </dependencyManagement> ``` #### 步骤3：排除冲突传递依赖 在Flink CDC连接器依赖中排除旧版Kafka客户端： ```xml <dependencies> <!-- Flink CDC连接器 --> <dependency> <groupId>com.ververica</groupId> <artifactId>flink-connector-mysql-cdc</artifactId> <version>${flink-cdc.version}</version> <exclusions> <exclusion> <groupId>org.apache.kafka</groupId> <artifactId>kafka-clients</artifactId> </exclusion> </exclusions> </dependency> <!-- 其他Flink CDC连接器同样处理 --> </dependencies> ``` ### 验证依赖树 执行以下命令确认Kafka客户端版本已统一： ```bash mvn clean dependency:tree -Dincludes="org.apache.kafka:kafka-clients" ``` 预期输出应显示所有模块使用`kafka-clients:2.6.2`。 ### 备选方案：升级Debezium（风险较高） 若必须使用Kafka 2.8.x，需升级Debezium至2.x版本（如2.3.0.Final）： ```xml <properties> <debezium.version>2.3.0.Final</debezium.version> <kafka-clients.version>3.2.4</kafka-clients.version> <!-- Debezium 2.x需要Kafka 3.x --> </properties> ``` **注意**：此方案需同步升级Flink CDC至3.2.0+版本，且需全面测试与Flink 1.19.3的兼容性。 ### 错误原因分析 - **`NoSuchMethodError`**：Debezium 1.9.8中的`Field.withType()`方法签名与Kafka 2.8.1的`ConfigDef$Type`类不匹配。 - **`NoClassDefFoundError`**：因上述方法缺失导致`HistorizedRelationalDatabaseConnectorConfig`类初始化失败。 ### 引用说明 1. 类似依赖冲突问题可通过调整版本解决[^1] 2. 镜像仓库通常不影响类加载问题[^2] §§相关问题§§ 1. 如何检查Maven依赖冲突？ 2. Debezium与Kafka的版本兼容性规则是什么？ 3. Flink CDC如何选择兼容的Debezium版本？ </think> 根据您的错误信息和项目依赖配置，核心问题是 **Debezium 1.9.8.Final 与 Kafka-clients 2.8.1 版本不兼容**。以下是完整解决方案： ### 解决方案（首选） #### 步骤1：降低 Kafka-clients 版本 ```xml <!-- 修改 properties 部分 --> <properties> <!-- 将 Kafka 版本降级至与 Debezium 1.9.8 兼容的版本 --> <kafka-clients.version>2.6.2</kafka-clients.version> </properties> ``` #### 步骤2：在所有依赖中排除冲突的 Kafka-clients ```xml <dependencies> <!-- Flink CDC 连接器 --> <dependency> <groupId>com.ververica</groupId> <artifactId>flink-connector-mysql-cdc</artifactId> <exclusions> <exclusion> <groupId>org.apache.kafka</groupId> <artifactId>kafka-clients</artifactId> </exclusion> </exclusions> </dependency> <!-- 人大金仓 CDC 连接器 --> <dependency> <groupId>com.kingbase</groupId> <artifactId>flink-sql-cdc-connector-kes-v2</artifactId> <exclusions> <exclusion> <groupId>org.apache.kafka</groupId> <artifactId>kafka-clients</artifactId> </exclusion> </exclusions> </dependency> <!-- 显式引入兼容版本的 Kafka-clients --> <dependency> <groupId>org.apache.kafka</groupId> <artifactId>kafka-clients</artifactId> <version>${kafka-clients.version}</version> </dependency> </dependencies> ``` ### 备选方案（升级 Debezium） ```xml <properties> <!-- 升级 Debezium 和 Kafka --> <debezium.version>2.3.0.Final</debezium.version> <kafka-clients.version>3.2.4</kafka-clients.version> <flink-cdc.version>3.2.0</flink-cdc.version> </properties> <dependencies> <!-- 显式升级 Debezium --> <dependency> <groupId>io.debezium</groupId> <artifactId>debezium-core</artifactId> <version>${debezium.version}</version> </dependency> <dependency> <groupId>io.debezium</groupId> <artifactId>debezium-connector-mysql</artifactId> <version>${debezium.version}</version> </dependency> <!-- 升级 Flink CDC --> <dependency> <groupId>com.ververica</groupId> <artifactId>flink-connector-mysql-cdc</artifactId> <version>${flink-cdc.version}</version> <exclusions> <exclusion> <groupId>org.apache.kafka</groupId> <artifactId>kafka-clients</artifactId> </exclusion> </exclusions> </dependency> </dependencies> ``` ### 错误原因深度分析 1. **类初始化失败(`NoClassDefFoundError`)** `HistorizedRelationalDatabaseConnectorConfig` 静态初始化时调用 `Field.withType()` 方法失败 ```java // Debezium 1.9.8 源码片段 public static final Field SERVER_NAME = Field.create("database.server.name") .withType(ConfigDef.Type.STRING) // 此方法签名在kafka-clients 2.8.1中已改变 .withImportance(ConfigDef.Importance.HIGH); ``` 2. **版本兼容矩阵** | 组件 | 兼容版本 | 冲突版本 | |----------------|------------------------|----------------| | Debezium 1.9.x | Kafka-clients ≤ 2.6.x | Kafka 2.8.1 | | Debezium 2.x | Kafka-clients ≥ 3.x | Kafka < 3.x | ### 验证步骤 1. **检查依赖树** ```bash mvn clean dependency:tree -Dincludes="io.debezium:*,org.apache.kafka:*" ``` 确认输出中只有 **一个** Kafka-clients 版本 2. **字节码验证工具** ```java public class DebeziumCompatibilityChecker { public static void main(String[] args) { try { Class.forName("io.debezium.relational.HistorizedRelationalDatabaseConnectorConfig"); ConfigDef.Type.STRING.getClass(); // Kafka 核心类 System.out.println("✅ 版本兼容性验证通过"); } catch (Exception e) { System.err.println("❌ 类加载失败: " + e.getMessage()); } } } ``` ### 附加优化 ```xml <!-- 在 build 插件中添加字节码校验 --> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-enforcer-plugin</artifactId> <version>3.3.0</version> <executions> <execution> <id>enforce-versions</id> <goals> <goal>enforce</goal> </goals> <configuration> <rules> <bannedDependencies> <!-- 禁止引入不兼容的 Kafka 版本 --> <excludes> <exclude>org.apache.kafka:kafka-clients:(,2.6.0],[2.7,)</exclude> </excludes> </bannedDependencies> </rules> </configuration> </execution> </executions> </plugin> ``` ### 结果预期 执行修改后： 1. `NoSuchMethodError` 和 `NoClassDefFoundError` 错误将消失 2. Debezium 连接器能正常初始化 3. 人大金仓 CDC 连接器可加载历史表配置 > **首选降级方案**，因为： > 1. 与现有 Flink 1.19.3 兼容性更好 > 2. 不需要修改业务代码 > 3. 风险更低（仅降低一个依赖版本）
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