我有一个带有 JPA 实体和 persistence.xml 的 java 模块，我想生成元模型。我尝试了两种变体。
变体1
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.8.1</version>
<configuration>
<source>${maven.compiler.source}</source>
<target>${maven.compiler.target}</target>
<annotationProcessorPaths>
<annotationProcessorPath>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-jpamodelgen</artifactId>
<version>5.4.14.Final</version>
</annotationProcessorPath>
<path>
<groupId>javax.xml.bind</groupId>
<artifactId>jaxb-api</artifactId>
<version>2.3.0</version>
</path>
<path>
<groupId>javax.annotation</groupId>
<artifactId>javax.annotation-api</artifactId>
<version>1.3.1</version>
</path>
</annotationProcessorPaths>
</configuration>
<dependencies>
</dependencies>
</plugin>
Result:
Caused by: java.lang.NullPointerException
at org.hibernate.jpamodelgen.ClassWriter.writeGeneratedAnnotation(ClassWriter.java:202)
at org.hibernate.jpamodelgen.ClassWriter.generateBody(ClassWriter.java:100)
at org.hibernate.jpamodelgen.ClassWriter.writeFile(ClassWriter.java:53)
at org.hibernate.jpamodelgen.JPAMetaModelEntityProcessor.createMetaModelClasses(JPAMetaModelEntityProcessor.java:145)
at org.hibernate.jpamodelgen.JPAMetaModelEntityProcessor.process(JPAMetaModelEntityProcessor.java:135)
at jdk.compiler/com.sun.tools.javac.processing.JavacProcessingEnvironment.callProcessor(JavacProcessingEnvironment.java:972)
at jdk.compiler/com.sun.tools.javac.processing.JavacProcessingEnvironment.discoverAndRunProcs(JavacProcessingEnvironment.java:888)
at jdk.compiler/com.sun.tools.javac.processing.JavacProcessingEnvironment$Round.run(JavacProcessingEnvironment.java:1214)
at jdk.compiler/com.sun.tools.javac.processing.JavacProcessingEnvironment.doProcessing(JavacProcessingEnvironment.java:1326)
at jdk.compiler/com.sun.tools.javac.main.JavaCompiler.processAnnotations(JavaCompiler.java:1258)
at jdk.compiler/com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:936)
at jdk.compiler/com.sun.tools.javac.api.JavacTaskImpl.lambda$doCall$0(JavacTaskImpl.java:104)
at jdk.compiler/com.sun.tools.javac.api.JavacTaskImpl.handleExceptions(JavacTaskImpl.java:147)
... 28 more
变体2
<plugin>
<groupId>org.bsc.maven</groupId>
<artifactId>maven-processor-plugin</artifactId>
<version>3.3.3</version>
<executions>
<execution>
<goals>
<goal>process</goal>
</goals>
<phase>generate-sources</phase>
<configuration>
<compilerArguments>-AaddGeneratedAnnotation=false</compilerArguments>
<processors>
<processor>org.hibernate.jpamodelgen.JPAMetaModelEntityProcessor</processor>
</processors>
</configuration>
</execution>
</executions>
<dependencies>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-jpamodelgen</artifactId>
<version>5.4.14.Final</version>
</dependency>
</dependencies>
</plugin>
结果出现很多错误，如下所示：
[ERROR] diagnostic: /home/<deleted>/src/main/java/module-info.java:11: error: module not found: org.slf4j
requires org.slf4j;
^
[ERROR] diagnostic: /home/<deleted>/src/main/java/module-info.java:15: error: module not found: java.persistence
requires java.persistence;
^
是否可以为 Java 11 和 java 模块生成 hibernate 模型？
以前不可能，现在有可能了。我打开了一个问题maven-processor-plugin他们做了必要的修改。所以，使用版本4.0-rc1+和以下代码：
<plugin>
<groupId>org.bsc.maven</groupId>
<artifactId>maven-processor-plugin</artifactId>
<version>4.0-rc1</version>
<executions>
<execution>
<goals>
<goal>process</goal>
</goals>
<phase>generate-sources</phase>
<configuration>
<processors>
<processor>org.hibernate.jpamodelgen.JPAMetaModelEntityProcessor</processor>
</processors>
<compilerArguments>-AaddGeneratedAnnotation=false</compilerArguments>
</configuration>
</execution>
</executions>
<dependencies>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-jpamodelgen</artifactId>
<version>5.4.14.Final</version>
</dependency>
</dependencies>
</plugin>
Edit:这是链接到issue.
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