maven项目的pom.xml文件不识别$符号，爆红

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  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)