maven项目的pom.xml文件不识别$符号标红，引入mapstruct报错

错误一：

在IntelliJ IDEA中， maven项目的pom.xml文件不识别$符号，，

解决方案：

删除项目，从新从gitlab上下载。

可能因为缓存，但是我清理了缓存仍然无用。最后删除重新下载。

错误二：

由于引入：mapstruct-processor，

报错：java: Internal error in the mapping processor: java.lang.NullPointerException

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 org.jetbrains.jps.javac.APIWrappers$ProcessorWrapper.process(APIWrappers.java:206)      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:362)      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:239)      at org.jetbrains.jps.javac.ExternalJavacProcess.compile(ExternalJavacProcess.java:189)      at org.jetbrains.jps.javac.ExternalJavacProcess.access$400(ExternalJavacProcess.java:28)      at org.jetbrains.jps.javac.ExternalJavacProcess$CompilationRequestsHandler$1.run(ExternalJavacProcess.java:262)      at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)      at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)      at java.lang.Thread.run(Thread.java:748)

解决方案：

Idea设置： Setting -->Build,Execution,Deployment -->Compiler -->User-local build process VM options (overrides Shared options):

加上参数：

-Djps.track.ap.dependencies=false

错误三：

由于引入：mapstruct-processor，

编译报错：java: Internal error in the mapping processor: java.lang.OutOfMemoryError: GC overhead limit exceeded

java: Internal error in the mapping processor: java.lang.OutOfMemoryError: GC overhead limit exceeded      at java.util.Arrays.copyOf(Arrays.java:3181)      at java.util.ArrayList.toArray(ArrayList.java:380)      at java.util.ArrayList.addAll(ArrayList.java:581)      at org.mapstruct.ap.internal.model.source.selector.TypeSelector.getCandidateParameterBindingPermutations(TypeSelector.java:272)      at org.mapstruct.ap.internal.model.source.selector.TypeSelector.getMatchingMethods(TypeSelector.java:67)      at org.mapstruct.ap.internal.model.source.selector.MethodSelectors.getMatchingMethods(MethodSelectors.java:62)      at org.mapstruct.ap.internal.model.LifecycleMethodResolver.collectLifecycleCallbackMethods(LifecycleMethodResolver.java:140)      at org.mapstruct.ap.internal.model.LifecycleMethodResolver.afterMappingMethods(LifecycleMethodResolver.java:67)      at org.mapstruct.ap.internal.model.BeanMappingMethod$Builder.build(BeanMappingMethod.java:222)      at org.mapstruct.ap.internal.processor.MapperCreationProcessor.getMappingMethods(MapperCreationProcessor.java:376)      at org.mapstruct.ap.internal.processor.MapperCreationProcessor.getMapper(MapperCreationProcessor.java:151)      at org.mapstruct.ap.internal.processor.MapperCreationProcessor.process(MapperCreationProcessor.java:122)      at org.mapstruct.ap.internal.processor.MapperCreationProcessor.process(MapperCreationProcessor.java:76)      at org.mapstruct.ap.MappingProcessor.process(MappingProcessor.java:283)      at org.mapstruct.ap.MappingProcessor.processMapperTypeElement(MappingProcessor.java:263)      at org.mapstruct.ap.MappingProcessor.processMapperElements(MappingProcessor.java:221)      at org.mapstruct.ap.MappingProcessor.process(MappingProcessor.java:156)      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:239)      at org.jetbrains.jps.javac.ExternalJavacProcess.compile(ExternalJavacProcess.java:189)      at org.jetbrains.jps.javac.ExternalJavacProcess.access$400(ExternalJavacProcess.java:28)      at org.jetbrains.jps.javac.ExternalJavacProcess$CompilationRequestsHandler$1.run(ExternalJavacProcess.java:262)      at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)