引言

MapStruct是一個強大的Java映射框架，它能夠在編譯時生成映射代碼，提高了映射的性能。然而，有時候在使用MapStruct時可能會遇到一些問題，其中之一就是java: Internal error in the mapping processor: java.lang.NullPointerException錯誤。

錯誤原因

這個錯誤通常是由于MapStruct在處理映射時出現(xiàn)了空指針異常引起的?？赡艿脑蚴牵?br />版本兼容性問題： 使用不兼容的MapStruct版本可能導(dǎo)致內(nèi)部處理器錯誤。

 <!--MapStruct 依賴-->
 <dependency>
      <groupId>org.mapstruct</groupId>
      <artifactId>mapstruct</artifactId>
      <version>1.3.1.Final</version>
  </dependency>
  <!--MapStruct 注解處理器-->
  <dependency>
      <groupId>org.mapstruct</groupId>
      <artifactId>mapstruct-processor</artifactId>
      <version>1.3.1.Final</version>
  </dependency>

java: Internal error in the mapping processor: java.lang.NullPointerException      at org.mapstruct.ap.internal.processor.DefaultVersionInformation.createManifestUrl(DefaultVersionInformation.java:182)      at org.mapstruct.ap.internal.processor.DefaultVersionInformation.openManifest(DefaultVersionInformation.java:153)      at org.mapstruct.ap.internal.processor.DefaultVersionInformation.getLibraryName(DefaultVersionInformation.java:129)      at org.mapstruct.ap.internal.processor.DefaultVersionInformation.getCompiler(DefaultVersionInformation.java:122)      at org.mapstruct.ap.internal.processor.DefaultVersionInformation.fromProcessingEnvironment(DefaultVersionInformation.java:95)      at org.mapstruct.ap.internal.processor.DefaultModelElementProcessorContext.<init>(DefaultModelElementProcessorContext.java:50)      at org.mapstruct.ap.MappingProcessor.processMapperElements(MappingProcessor.java:218)      at org.mapstruct.ap.MappingProcessor.process(MappingProcessor.java:156)      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.jetbrains.jps.javac.APIWrappers$1.invoke(APIWrappers.java:248)      at org.mapstruct.ap.MappingProcessor.process(Unknown Source)      at com.sun.tools.javac.processing.JavacProcessingEnvironment.callProcessor(JavacProcessingEnvironment.java:794)      at com.sun.tools.javac.processing.JavacProcessingEnvironment.discoverAndRunProcs(JavacProcessingEnvironment.java:705)      at com.sun.tools.javac.processing.JavacProcessingEnvironment.access$1800(JavacProcessingEnvironment.java:91)      at com.sun.tools.javac.processing.JavacProcessingEnvironment$Round.run(JavacProcessingEnvironment.java:1035)      at com.sun.tools.javac.processing.JavacProcessingEnvironment.doProcessing(JavacProcessingEnvironment.java:1176)      at com.sun.tools.javac.main.JavaCompiler.processAnnotations(JavaCompiler.java:1170)      at com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:856)      at com.sun.tools.javac.main.Main.compile(Main.java:523)      at com.sun.tools.javac.api.JavacTaskImpl.doCall(JavacTaskImpl.java:129)      at com.sun.tools.javac.api.JavacTaskImpl.call(JavacTaskImpl.java:138)      at org.jetbrains.jps.javac.JavacMain.compile(JavacMain.java:231)      at org.jetbrains.jps.incremental.java.JavaBuilder.compileJava(JavaBuilder.java:501)      at org.jetbrains.jps.incremental.java.JavaBuilder.compile(JavaBuilder.java:353)      at org.jetbrains.jps.incremental.java.JavaBuilder.doBuild(JavaBuilder.java:277)      at org.jetbrains.jps.incremental.java.JavaBuilder.build(JavaBuilder.java:231)      at org.jetbrains.jps.incremental.IncProjectBuilder.runModuleLevelBuilders(IncProjectBuilder.java:1441)      at org.jetbrains.jps.incremental.IncProjectBuilder.runBuildersForChunk(IncProjectBuilder.java:1100)      at org.jetbrains.jps.incremental.IncProjectBuilder.buildTargetsChunk(IncProjectBuilder.java:1224)      at org.jetbrains.jps.incremental.IncProjectBuilder.buildChunkIfAffected(IncProjectBuilder.java:1066)      at org.jetbrains.jps.incremental.IncProjectBuilder.buildChunks(IncProjectBuilder.java:832)      at org.jetbrains.jps.incremental.IncProjectBuilder.runBuild(IncProjectBuilder.java:419)      at org.jetbrains.jps.incremental.IncProjectBuilder.build(IncProjectBuilder.java:183)      at org.jetbrains.jps.cmdline.BuildRunner.runBuild(BuildRunner.java:132)      at org.jetbrains.jps.cmdline.BuildSession.runBuild(BuildSession.java:302)      at org.jetbrains.jps.cmdline.BuildSession.run(BuildSession.java:132)      at org.jetbrains.jps.cmdline.BuildMain$MyMessageHandler.lambda$channelRead0$0(BuildMain.java:219)      at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)      at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)      at java.lang.Thread.run(Thread.java:748)  

解決方案

將 MapStruct 更新到 1.4.1.Final 或更高版本

<!--MapStruct 依賴-->
<dependency>
      <groupId>org.mapstruct</groupId>
      <artifactId>mapstruct</artifactId>
      <version>1.4.1.Final</version>
  </dependency>
  <!--MapStruct 注解處理器-->
  <dependency>
      <groupId>org.mapstruct</groupId>
      <artifactId>mapstruct-processor</artifactId>
      <version>1.4.1.Final</version>
  </dependency>

如果還出現(xiàn)以下錯誤

java:No property named "xxx" exists in source parameter(s). Did you mean "null"?

引入依賴解決

<dependency>
      <groupId>org.projectlombok</groupId>
      <artifactId>lombok-mapstruct-binding</artifactId>
      <version>0.2.0</version>
</dependency>

到此這篇關(guān)于Java中MapStruct映射處理器報錯的問題解決的文章就介紹到這了,更多相關(guān)Java MapStruct映射處理器報錯內(nèi)容請搜索腳本之家以前的文章或繼續(xù)瀏覽下面的相關(guān)文章希望大家以后多多支持腳本之家！

最新評論