JPA：错误：尝试重新创建类型为[[

Question

每次运行代码时，都会出现以下错误：

 java.lang.RuntimeException: javax.annotation.processing.FilerException: Attempt to recreate a file for type domein.ClubLes_
    [javac]     at org.eclipse.persistence.internal.jpa.modelgen.CanonicalModelProcessor.process(CanonicalModelProcessor.java:407)
    [javac]     at jdk.compiler/com.sun.tools.javac.processing.JavacProcessingEnvironment.callProcessor(JavacProcessingEnvironment.java:964)
    [javac]     at jdk.compiler/com.sun.tools.javac.processing.JavacProcessingEnvironment.discoverAndRunProcs(JavacProcessingEnvironment.java:881)
    [javac]     at jdk.compiler/com.sun.tools.javac.processing.JavacProcessingEnvironment.access$2100(JavacProcessingEnvironment.java:110)
    [javac]     at jdk.compiler/com.sun.tools.javac.processing.JavacProcessingEnvironment$Round.run(JavacProcessingEnvironment.java:1202)
    [javac]     at jdk.compiler/com.sun.tools.javac.processing.JavacProcessingEnvironment.doProcessing(JavacProcessingEnvironment.java:1311)
    [javac]     at jdk.compiler/com.sun.tools.javac.main.JavaCompiler.processAnnotations(JavaCompiler.java:1250)
    [javac]     at jdk.compiler/com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:928)
    [javac]     at jdk.compiler/com.sun.tools.javac.main.Main.compile(Main.java:306)
    [javac]     at jdk.compiler/com.sun.tools.javac.main.Main.compile(Main.java:165)
    [javac]     at jdk.compiler/com.sun.tools.javac.Main.compile(Main.java:57)
    [javac]     at jdk.compiler/com.sun.tools.javac.Main.main(Main.java:43)
    [javac] Caused by: javax.annotation.processing.FilerException: Attempt to recreate a file for type domein.ClubLes_
    [javac]     at jdk.compiler/com.sun.tools.javac.processing.JavacFiler.checkNameAndExistence(JavacFiler.java:727)
    [javac]     at jdk.compiler/com.sun.tools.javac.processing.JavacFiler.createSourceOrClassFile(JavacFiler.java:489)
    [javac]     at jdk.compiler/com.sun.tools.javac.processing.JavacFiler.createSourceFile(JavacFiler.java:426)
    [javac]     at org.eclipse.persistence.internal.jpa.modelgen.CanonicalModelProcessor.generateCanonicalModelClass(CanonicalModelProcessor.java:98)
    [javac]     at org.eclipse.persistence.internal.jpa.modelgen.CanonicalModelProcessor.generateCanonicalModelClasses(CanonicalModelProcessor.java:226)
    [javac]     at org.eclipse.persistence.internal.jpa.modelgen.CanonicalModelProcessor.process(CanonicalModelProcessor.java:403)
    [javac]     ... 11 more

BUILD FAILED
E:\ProjectJava\java-g11\Taijitan\nbproject\build-impl.xml:1134: The following error occurred while executing this line:
E:\ProjectJava\java-g11\Taijitan\nbproject\build-impl.xml:381: Compile failed; see the compiler error output for details.

起初我以为是因为我不小心忘记添加子类，但是它仍然给我同样的错误。 ClubLes继承自Les，Les是仅包含吸气剂的接口。我还需要使接口可序列化吗？我不知道怎么了。
ClubLes
@Entity
public class ClubLes implements Serializable, Les {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "LesId")
    private int id;
    @Column(name = "Naam")
    String naam;
    @Column(name = "Soort")
    String soort;
    @ManyToOne
    @JoinColumn(name = "GraadNumeriek")
    Graad graad;
    @Column(name = "FotoUrl")
    private String fotoUrl;
    @Column(name = "Beschrijving")
    private String beschrijving;
    @Column(name = "VideoUrl")
    private String videoUrl;

    public ClubLes() {
    }

Les interface
public interface Les {

    int getId();
    String getNaam();
    String getSoort();
    //More getters
}

PU我只有一个持久性单元，看起来像这样
<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.1" xmlns="http://xmlns.jcp.org/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence http://xmlns.jcp.org/xml/ns/persistence/persistence_2_1.xsd">
  <persistence-unit name="TaijitanPU" transaction-type="RESOURCE_LOCAL">
    <provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>
    <class>domein.Graad</class>
    <class>domein.Locatie</class>
    <class>domein.ClubPersoon</class>
    <class>domein.ClubActiviteit</class>
    <class>domein.ClubLes</class>
    <properties>
      <property name="javax.persistence.jdbc.url" value="jdbc:sqlserver://localhost:1433;databaseName=Taijitan"/>
      <property name="javax.persistence.jdbc.user" value="sa"/>
      <property name="javax.persistence.jdbc.driver" value="com.microsoft.sqlserver.jdbc.SQLServerDriver"/>
      <property name="javax.persistence.jdbc.password" value="Wachtwoord2019"/>
      <property name="javax.persistence.schema-generation.database.action" value="drop-and-create"/>
    </properties>
  </persistence-unit>
</persistence>

[我还注意到，当我从JPA删除clublesson时，它会为ClubPersoon引发相同的错误，遵循相同的方案

Answer 1

尝试将<exclude-unlisted-classes>true</exclude-unlisted-classes>添加到persistence.xml。我认为该类正在处理两次，原因是缺少此语句。