报错NoClassDefFoundError: com/fasterxml/jackson/core/json/JsonWriteFeature； omitted for conflict with

原创 2023-03-23 10:57:13 5.8k 阅读 AI写同款

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【IDEA】java.lang.NoClassDefFoundError: com/fasterxml/jackson/databind/ObjectMapper的解决方法在pom.xml导入坐标后仍报错 com.fasterxml.jackson.core jackson-core 2.9.0 com.fasterxml.jackson.core jackson-databind 2.9.0 com.fasterxml.jackson.core jackson-annotations 2.9.0 Type 异常报告消息 Handler dispatch failed; nested exception is java.lang.NoClassDefFoundE 阅读详情

AI摘要

文章描述了在Java项目中遇到`NoClassDefFoundError`错误，原因是不同库引用了不同版本的Jackson库导致的冲突。通过运行`mvndependency:tree`命令找出冲突的依赖，并在POM.xml文件中添加排除(exclusions)来解决冲突。最终，确保所有Jackson相关库使用同一版本，避免错误发生。

java.lang.NoClassDefFoundError: com/fasterxml/jackson/core/json/JsonWriteFeature
在这里插入图片描述
原因是需要的fasterxml的版本包和其他包里面的旧版本重复而丢弃

运行命令：
mvn dependency:tree -Dverbose -Dincludes=*fasterxml*:*databind*
找出所有包含*fasterxml*:*jackson*的包：

[INFO] 
[INFO] --- maven-dependency-plugin:2.8:tree (default-cli) @ sr-flow-api ---
[INFO] com.huawei.ccloud.sparkle.search:sr-flow-api:jar:1.0.0-SNAPSHOT
[INFO] +- org.apache.spark:spark-mllib_2.12:jar:3.0.1:provided
[INFO] |  +- org.apache.spark:spark-core_2.12:jar:3.0.1:provided
[INFO] |  |  +- org.apache.spark:spark-kvstore_2.12:jar:3.0.1:provided
[INFO] |  |  |  \- (com.fasterxml.jackson.core:jackson-databind:jar:2.10.0:provided - omitted for duplicate)
[INFO] |  |  +- org.apache.spark:spark-network-common_2.12:jar:3.0.1:provided
[INFO] |  |  |  \- (com.fasterxml.jackson.core:jackson-databind:jar:2.10.0:provided - omitted for duplicate)
[INFO] |  |  +- io.dropwizard.metrics:metrics-json:jar:4.1.1:provided
[INFO] |  |  |  \- (com.fasterxml.jackson.core:jackson-databind:jar:2.9.9.3:provided - omitted for conflict with 2.10.0)
[INFO] |  |  +- (com.fasterxml.jackson.core:jackson-databind:jar:2.10.0:provided - omitted for conflict with 2.6.3)
[INFO] |  |  \- com.fasterxml.jackson.module:jackson-module-scala_2.12:jar:2.10.0:provided
[INFO] |  |     +- (com.fasterxml.jackson.core:jackson-databind:jar:2.10.0:provided - omitted for duplicate)
[INFO] |  |     \- com.fasterxml.jackson.module:jackson-module-paranamer:jar:2.10.0:provided
[INFO] |  |        \- (com.fasterxml.jackson.core:jackson-databind:jar:2.10.0:provided - omitted for duplicate)
[INFO] |  \- org.apache.spark:spark-sql_2.12:jar:3.0.1:provided
[INFO] |     \- (com.fasterxml.jackson.core:jackson-databind:jar:2.10.0:provided - omitted for duplicate)
[INFO] +- org.apache.kafka:kafka-streams:jar:0.10.0.0:provided
[INFO] |  +- org.apache.kafka:connect-json:jar:0.10.0.0:provided
[INFO] |  |  \- (com.fasterxml.jackson.core:jackson-databind:jar:2.6.3:provided - omitted for conflict with 2.10.0)
[INFO] |  \- com.fasterxml.jackson.core:jackson-databind:jar:2.6.3:provided
[INFO] +- org.apache.spark:spark-hive_2.12:jar:3.0.1:provided
[INFO] |  \- org.apache.hive:hive-common:jar:2.3.7:provided
[INFO] |     \- (com.fasterxml.jackson.core:jackson-databind:jar:2.6.5:provided - omitted for conflict with 2.6.3)
[INFO] \- org.json4s:json4s-jackson_2.12:jar:4.1.0-M2:provided
[INFO]    \- org.json4s:json4s-jackson-core_2.12:jar:4.1.0-M2:provided
[INFO]       \- (com.fasterxml.jackson.core:jackson-databind:jar:2.13.4.2:provided - omitted for conflict with 2.6.3)
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time:  5.620 s
[INFO] Finished at: 2023-03-23T10:20:04+08:00
[INFO] ------------------------------------------------------------------------

Process finished with exit code 0

找到相关jar包的pom引入处（如果父pom中用了 dependencyManagement，直接再父pom中修改，就可以影响所有子pom了），加上：

                <exclusions>
                    <exclusion>
                        <groupId>com.fasterxml.jackson.core</groupId>
                        <artifactId>jackson-databind</artifactId>
                    </exclusion>
                </exclusions>

例如：

<dependency>
                <groupId>org.apache.spark</groupId>
                <artifactId>spark-hive_2.12</artifactId>
                <version>${spark.version}</version>
                <scope>${fi.scope}</scope>
                <exclusions>
                    <exclusion>
                        <groupId>com.fasterxml.jackson.core</groupId>
                        <artifactId>jackson-databind</artifactId>
                    </exclusion>
                </exclusions>
</dependency>

加完后再执行命令可以看到，没有冲突了：

[INFO] --- maven-dependency-plugin:2.8:tree (default-cli) @ sr-flow-api ---
[INFO] com.huawei.ccloud.sparkle.search:sr-flow-api:jar:1.0.0-SNAPSHOT
[INFO] \- org.json4s:json4s-jackson_2.12:jar:4.1.0-M2:provided
[INFO]    \- org.json4s:json4s-jackson-core_2.12:jar:4.1.0-M2:provided
[INFO]       \- com.fasterxml.jackson.core:jackson-databind:jar:2.13.4.2:provided
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time:  7.871 s
[INFO] Finished at: 2023-03-23T10:25:45+08:00
[INFO] ------------------------------------------------------------------------

Process finished with exit code 0

若mvn命令跑出来的结果已经更新，但是是idea没有更新：
在这里插入图片描述
则File->Invalidate caches 清除缓存重启即可：

实际上，要想解决java.lang.NoClassDefFoundError: com/fasterxml/jackson/core/json/JsonWriteFeature问题，还没结束，还要将以下两个jar包冲突排除，用一样的方法:

                <exclusions>
                    <exclusion>
                        <groupId>com.fasterxml.jackson.core</groupId>
                        <artifactId>jackson-databind</artifactId>
                    </exclusion>
                    <exclusion>
                        <groupId>com.fasterxml.jackson.core</groupId>
                        <artifactId>jackson-core</artifactId>
                    </exclusion>
                    <exclusion>
                        <groupId>com.fasterxml.jackson.core</groupId>
                        <artifactId>jackson-annotations</artifactId>
                    </exclusion>
                </exclusions>