java.lang.NullPointerException: Cannot invoke "java.net.URL.toExternalForm()" because "resource" is null at org.mapstruct

user_11694539 0
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mvn compilation using Idea works fine.

Fails during App.main start.

Works well on older Idea on other PC on Ubuntu.

ENV:

  • Intellij 2020.3.2 as admin;

  • Java 15.02;

  • Windows 10 x64;

  • latest mapstruct.

How to fix this?

D:\back\src\main\java\io\x\mapper\Mapper.java:15:8 java: Internal error in the mapping processor: java.lang.NullPointerException: Cannot invoke "java.net.URL.toExternalForm()" because "resource" is null
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 jdk.internal.reflect.GeneratedMethodAccessor207.invoke(Unknown Source)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
at org.jetbrains.jps.javac.APIWrappers$1.invoke(APIWrappers.java:248)
at lombok.launch.AnnotationProcessorHider$AnnotationProcessor.process(Unknown Source)
at jdk.compiler/com.sun.tools.javac.processing.JavacProcessingEnvironment.callProcessor(JavacProcessingEnvironment.java:1025)
at jdk.compiler/com.sun.tools.javac.processing.JavacProcessingEnvironment.discoverAndRunProcs(JavacProcessingEnvironment.java:940)
at jdk.compiler/com.sun.tools.javac.processing.JavacProcessingEnvironment$Round.run(JavacProcessingEnvironment.java:1269)
at jdk.compiler/com.sun.tools.javac.processing.JavacProcessingEnvironment.doProcessing(JavacProcessingEnvironment.java:1383)
at jdk.compiler/com.sun.tools.javac.main.JavaCompiler.processAnnotations(JavaCompiler.java:1261)
at jdk.compiler/com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:935)
at jdk.compiler/com.sun.tools.javac.api.JavacTaskImpl.lambda$doCall$0(JavacTaskImpl.java:104)
at jdk.compiler/com.sun.tools.javac.api.JavacTaskImpl.handleExceptions(JavacTaskImpl.java:147)
at jdk.compiler/com.sun.tools.javac.api.JavacTaskImpl.doCall(JavacTaskImpl.java:100)
at jdk.compiler/com.sun.tools.javac.api.JavacTaskImpl.call(JavacTaskImpl.java:94)
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.access$1200(IncProjectBuilder.java:67)
at org.jetbrains.jps.incremental.IncProjectBuilder$BuildParallelizer$1.run(IncProjectBuilder.java:1006)
at com.intellij.util.concurrency.BoundedTaskExecutor.doRun(BoundedTaskExecutor.java:216)
at com.intellij.util.concurrency.BoundedTaskExecutor.access$200(BoundedTaskExecutor.java:27)
at com.intellij.util.concurrency.BoundedTaskExecutor$1.execute(BoundedTaskExecutor.java:195)
at com.intellij.util.ConcurrencyUtil.runUnderThreadName(ConcurrencyUtil.java:208)
at com.intellij.util.concurrency.BoundedTaskExecutor$1.run(BoundedTaskExecutor.java:184)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1130)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630)
at java.base/java.lang.Thread.run(Thread.java:832)
mapstruct intellij-idea java
4 Answers

I had a problem with MapStruct in Intellij 20.3.2. Error Internal error in the mapping processor: java.lang.NullPointerException: Cannot invoke "java.net.URL.toExternalForm()" because "resource" is null[...]. I did a little research and saw that it was enough to just change the version in pom.xml. Here on the documentation website we can see the package installation configuration:https://mapstruct.org/documentation/installation/ There was still an error in the following excerpt:

  <groupId>org.mapstruct</groupId>

  <artifactId>mapstruct</artifactId>

  <version>**${org.mapstruct.version}**</version>

Finally, placing the following version in 1.4.2.Final ran the application smoothly.

user_160405220

In your Intellij IDEA:

File | Settings | Build, Execution, Deployment | Compiler | user-local build process vm options

set this value :

-Djps.track.ap.dependencies=false
user_83814200

Please update to the current IDE and MapStruct versions. This issue was fixed long time ago.

See also this answer for the workaround.

user_1048910

Please update newVersion mapstruct

<dependency>
    <groupId>org.mapstruct</groupId>
    <artifactId>mapstruct</artifactId>
    <version>1.4.2.Final</version>
</dependency>
user_174698920
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