使用Maven和Intellij IDEA運行JPA 12

我剛切換到Intellij IDEA，並試圖使用RESOURCE_LOCAL持久性單元測試我的JPA實體。我的環境目前使用EclipseLink，MySQL和Maven。使用Maven和Intellij IDEA運行JPA 12

目前我的測試類執行以下電話：

EntityManagerFactory factory = Persistence.createEntityManagerFactory("app-test");

被檢測到的持久性單元（如果我更改persistence.xml文件的名稱，我得到一個錯誤，說單位不能被發現）。但是，如果我運行測試我收到以下錯誤控制檯：

Exception in thread "main" Local Exception Stack: 
Exception [EclipseLink-30005] (Eclipse Persistence Services - 2.4.0.v20120608-r11652): org.eclipse.persistence.exceptions.PersistenceUnitLoadingException 
Exception Description: An exception was thrown while searching for persistence archives with ClassLoader: [email protected] 
Internal Exception: javax.persistence.PersistenceException: Exception [EclipseLink-28018] (Eclipse Persistence Services - 2.4.0.v20120608-r11652): org.eclipse.persistence.exceptions.EntityManagerSetupException 
Exception Description: Predeployment of PersistenceUnit [app-test] failed. 
Internal Exception: java.lang.NullPointerException 
    at org.eclipse.persistence.exceptions.PersistenceUnitLoadingException.exceptionSearchingForPersistenceResources(PersistenceUnitLoadingException.java:127) 
    at org.eclipse.persistence.jpa.PersistenceProvider.createEntityManagerFactory(PersistenceProvider.java:115) 
    at javax.persistence.Persistence.createEntityManagerFactory(Unknown Source) 
    at javax.persistence.Persistence.createEntityManagerFactory(Unknown Source) 
    at suite.Suite.main(Suite.java:13) 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
    at java.lang.reflect.Method.invoke(Method.java:601) 
    at com.intellij.rt.execution.application.AppMain.main(AppMain.java:120) 
Caused by: javax.persistence.PersistenceException: Exception [EclipseLink-28018] (Eclipse Persistence Services - 2.4.0.v20120608-r11652): org.eclipse.persistence.exceptions.EntityManagerSetupException 
Exception Description: Predeployment of PersistenceUnit [app-test] failed. 
Internal Exception: java.lang.NullPointerException 
    at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.createPredeployFailedPersistenceException(EntityManagerSetupImpl.java:1541) 
    at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.predeploy(EntityManagerSetupImpl.java:1532) 
    at org.eclipse.persistence.internal.jpa.deployment.JPAInitializer.callPredeploy(JPAInitializer.java:98) 
    at org.eclipse.persistence.jpa.PersistenceProvider.createEntityManagerFactory(PersistenceProvider.java:105) 
    ... 8 more 
Caused by: Exception [EclipseLink-28018] (Eclipse Persistence Services - 2.4.0.v20120608-r11652): org.eclipse.persistence.exceptions.EntityManagerSetupException 
Exception Description: Predeployment of PersistenceUnit [app-test] failed. 
Internal Exception: java.lang.NullPointerException 
    at org.eclipse.persistence.exceptions.EntityManagerSetupException.predeployFailed(EntityManagerSetupException.java:221) 
    ... 12 more 
Caused by: java.lang.NullPointerException 
    at org.eclipse.persistence.internal.jpa.metadata.MetadataProject.hasEntity(MetadataProject.java:1272) 
    at org.eclipse.persistence.internal.jpa.metadata.accessors.objects.MetadataAnnotatedElement.isOneToMany(MetadataAnnotatedElement.java:610) 
    at org.eclipse.persistence.internal.jpa.metadata.accessors.classes.ClassAccessor.buildAccessor(ClassAccessor.java:594) 
    at org.eclipse.persistence.internal.jpa.metadata.accessors.classes.ClassAccessor.addAccessorFields(ClassAccessor.java:423) 
    at org.eclipse.persistence.internal.jpa.metadata.accessors.classes.ClassAccessor.addAccessors(ClassAccessor.java:395) 
    at org.eclipse.persistence.internal.jpa.metadata.accessors.classes.ClassAccessor.preProcess(ClassAccessor.java:1178) 
    at org.eclipse.persistence.internal.jpa.metadata.accessors.classes.MappedSuperclassAccessor.preProcess(MappedSuperclassAccessor.java:724) 
    at org.eclipse.persistence.internal.jpa.metadata.accessors.classes.EntityAccessor.preProcess(EntityAccessor.java:555) 
    at org.eclipse.persistence.internal.jpa.metadata.MetadataProject.processStage1(MetadataProject.java:1649) 
    at org.eclipse.persistence.internal.jpa.metadata.MetadataProcessor.processORMMetadata(MetadataProcessor.java:531) 
    at org.eclipse.persistence.internal.jpa.deployment.PersistenceUnitProcessor.processORMetadata(PersistenceUnitProcessor.java:550) 
    at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.predeploy(EntityManagerSetupImpl.java:1469) 
    ... 10 more

這是我的persistence.xml

<?xml version="1.0" encoding="UTF-8" ?> 
<persistence version="2.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd" xmlns="http://java.sun.com/xml/ns/persistence"> 
    <persistence-unit name="app-test" transaction-type="RESOURCE_LOCAL"> 
     <provider>org.eclipse.persistence.jpa.PersistenceProvider</provider> 
     <exclude-unlisted-classes>false</exclude-unlisted-classes> 
     <properties> 
      <property name="javax.persistence.jdbc.driver" value="com.mysql.jdbc.Driver" /> 
      <property name="javax.persistence.jdbc.url" value="jdbc:mysql://localhost:3306/app" /> 
      <property name="javax.persistence.jdbc.user" value="root" /> 
      <property name="javax.persistence.jdbc.password" value="" /> 
      <property name="eclipselink.ddl-generation" value="drop-and-create-tables" /> 
      <property name="eclipselink.ddl-generation.output-mode" value="database" /> 
      <property name="eclipselink.logging.level" value="FINEST" /> 
      <property name="eclipselink.logging.level.sql" value="FINEST" /> 
      <property name="eclipselink.logging.parameters" value="true" /> 
     </properties> 
    </persistence-unit> 
</persistence>

我的pom.xml：

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> 
    <modelVersion>4.0.0</modelVersion> 
    <groupId>com.app.entities</groupId> 
    <artifactId>app-entities</artifactId> 
    <version>0.0.1</version> 
    <packaging>jar</packaging> 
    <name>app-entities</name> 
    <url>http://maven.apache.org</url> 
    <properties> 
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> 
    </properties> 
    <dependencies> 
     <dependency> 
      <groupId>org.eclipse.persistence</groupId> 
      <artifactId>eclipselink</artifactId> 
      <version>2.4.0</version> 
     </dependency> 
     <dependency> 
      <groupId>org.eclipse.persistence</groupId> 
      <artifactId>javax.persistence</artifactId> 
      <version>2.0.0</version> 
     </dependency> 
     <dependency> 
      <groupId>junit</groupId> 
      <artifactId>junit</artifactId> 
      <version>4.11</version> 
     </dependency> 
     <dependency> 
      <groupId>com.fasterxml.jackson.core</groupId> 
      <artifactId>jackson-annotations</artifactId> 
      <version>2.1.4</version> 
     </dependency> 
     <dependency> 
      <groupId>com.fasterxml.jackson.core</groupId> 
      <artifactId>jackson-core</artifactId> 
      <version>2.1.4</version> 
     </dependency> 
     <dependency> 
      <groupId>mysql</groupId> 
      <artifactId>mysql-connector-java</artifactId> 
      <version>5.1.24</version> 
     </dependency> 
    </dependencies> 
</project>

我文件夾結構（我的所有實體都在src/main/java文件夾中）：

enter image description here

來源

2013-05-14 cardori

除了您遺漏了POM的<'部分之外，您的安裝程序在IntelliJ 11和Eclipse Indigo中均適用於我。 – Perception

我已經試過它與包括存儲庫部分，但它也沒有工作。你如何運行Intellij？ – cardori

對不起，我最後的評論沒有多大意義。你如何在IntelliJ中運行應用程序？你使用頂部的綠色箭頭運行應用程序還是使用右側的maven部分？ – cardori

我刪除了該項目並重新創建它，現在它正在工作。

來源

2013-05-15 17:08:54 cardori

使用Maven和Intellij IDEA運行JPA 12

回答

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