Run JPA using Maven and Intellij IDEA 12 -

i have switch on intellij idea , trying test jpa entities using resource_local persistence unit. environment using eclipselink, mysql , maven.

at moment test class performing following call:

entitymanagerfactory factory = persistence.createentitymanagerfactory("app-test"); 

the persistence unit being detected (if change name in persistence.xml file, error saying unit cannot found). however, if run test getting following errors in console:

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: exception thrown while searching persistence archives classloader: sun.misc.launcher$appclassloader@1005354a 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     @ org.eclipse.persistence.exceptions.persistenceunitloadingexception.exceptionsearchingforpersistenceresources(persistenceunitloadingexception.java:127)     @ org.eclipse.persistence.jpa.persistenceprovider.createentitymanagerfactory(persistenceprovider.java:115)     @ javax.persistence.persistence.createentitymanagerfactory(unknown source)     @ javax.persistence.persistence.createentitymanagerfactory(unknown source)     @ suite.suite.main(suite.java:13)     @ sun.reflect.nativemethodaccessorimpl.invoke0(native method)     @ sun.reflect.nativemethodaccessorimpl.invoke(nativemethodaccessorimpl.java:57)     @ sun.reflect.delegatingmethodaccessorimpl.invoke(delegatingmethodaccessorimpl.java:43)     @ java.lang.reflect.method.invoke(method.java:601)     @ 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     @ org.eclipse.persistence.internal.jpa.entitymanagersetupimpl.createpredeployfailedpersistenceexception(entitymanagersetupimpl.java:1541)     @ org.eclipse.persistence.internal.jpa.entitymanagersetupimpl.predeploy(entitymanagersetupimpl.java:1532)     @ org.eclipse.persistence.internal.jpa.deployment.jpainitializer.callpredeploy(jpainitializer.java:98)     @ 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     @ org.eclipse.persistence.exceptions.entitymanagersetupexception.predeployfailed(entitymanagersetupexception.java:221)     ... 12 more caused by: java.lang.nullpointerexception     @ org.eclipse.persistence.internal.jpa.metadata.metadataproject.hasentity(metadataproject.java:1272)     @ org.eclipse.persistence.internal.jpa.metadata.accessors.objects.metadataannotatedelement.isonetomany(metadataannotatedelement.java:610)     @ org.eclipse.persistence.internal.jpa.metadata.accessors.classes.classaccessor.buildaccessor(classaccessor.java:594)     @ org.eclipse.persistence.internal.jpa.metadata.accessors.classes.classaccessor.addaccessorfields(classaccessor.java:423)     @ org.eclipse.persistence.internal.jpa.metadata.accessors.classes.classaccessor.addaccessors(classaccessor.java:395)     @ org.eclipse.persistence.internal.jpa.metadata.accessors.classes.classaccessor.preprocess(classaccessor.java:1178)     @ org.eclipse.persistence.internal.jpa.metadata.accessors.classes.mappedsuperclassaccessor.preprocess(mappedsuperclassaccessor.java:724)     @ org.eclipse.persistence.internal.jpa.metadata.accessors.classes.entityaccessor.preprocess(entityaccessor.java:555)     @ org.eclipse.persistence.internal.jpa.metadata.metadataproject.processstage1(metadataproject.java:1649)     @ org.eclipse.persistence.internal.jpa.metadata.metadataprocessor.processormmetadata(metadataprocessor.java:531)     @ org.eclipse.persistence.internal.jpa.deployment.persistenceunitprocessor.processormetadata(persistenceunitprocessor.java:550)     @ org.eclipse.persistence.internal.jpa.entitymanagersetupimpl.predeploy(entitymanagersetupimpl.java:1469)     ... 10 more 

this 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> 

my 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> 

my folder structure (all entities in src/main/java folder):

i removed project , recreated scratch , working now.