【发布时间】：2016-03-02 13:14:39
【问题描述】：
我必须将旧的 jee 6/jpa2.0 项目迁移到 jee 7/jpa2.1。
我像这样在 pom.xml 中迁移：
<dependencyManagement>
<dependencies>
<dependency>
<groupId>fish.payara.extras</groupId>
<artifactId>payara-embedded-all</artifactId>
<version>4.1.1.154</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>javax</groupId>
<artifactId>javaee-api</artifactId>
<version>7.0</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>com.oracle</groupId>
<artifactId>ojdbc6</artifactId>
<version>11.2.0.2.0</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.eclipse.persistence</groupId>
<artifactId>javax.persistence</artifactId>
<version>2.1.0</version>
<scope>provided</scope>
</dependency>
</dependencies>
</dependencyManagement>
由于Oracle Database 11g，我仍然使用ojdbc6，尚未迁移。
我在persistence.xml 中替换了persistence 标签，现在看起来像这样：
<?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="pu1" transaction-type="JTA">
<provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>
<jta-data-source>jdbc/OraclePool</jta-data-source>
<exclude-unlisted-classes>false</exclude-unlisted-classes>
<properties>
<property name="eclipselink.logging.level" value="INFO" />
<property name="eclipselink.logging.level.sql" value="INFO" />
<property name="eclipselink.logging.parameters" value="true" />
<property name="eclipselink.cache.shared.default" value="false" />
</properties>
</persistence-unit>
<persistence-unit name="pu2" transaction-type="JTA">
<provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>
<jta-data-source>jdbc/OraclePoolNoTransact</jta-data-source>
<exclude-unlisted-classes>false</exclude-unlisted-classes>
<properties>
<property name="eclipselink.logging.level" value="INFO" />
<property name="eclipselink.logging.level.sql" value="INFO" />
<property name="eclipselink.logging.parameters" value="true" />
<property name="eclipselink.cache.shared.default" value="true" />
<property name="eclipselink.cache.type" value="HARD" />
<property name="eclipselink.cache.size" value="4000000000" />
</properties>
</persistence-unit>
</persistence>
现在日食说：
The persistence.xml file does not have supported content for this JPA platform.
当我使用 maven 编译代码时，我收到：
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.0:compile (default-compile) on project project.name: Fatal error compiling: java.lang.RuntimeException: java.lang.NullPointerException -> [Help 1]
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.0:compile (default-compile) on project project.name: Fatal error compiling
at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:217)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)
at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:84)
at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:59)
at org.apache.maven.lifecycle.internal.LifecycleStarter.singleThreadedBuild(LifecycleStarter.java:183)
at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:161)
at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:320)
at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:156)
at org.apache.maven.cli.MavenCli.execute(MavenCli.java:537)
at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:196)
at org.apache.maven.cli.MavenCli.main(MavenCli.java:141)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:290)
at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:230)
at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:409)
at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:352)
Caused by: org.apache.maven.plugin.MojoExecutionException: Fatal error compiling
at org.apache.maven.plugin.compiler.AbstractCompilerMojo.execute(AbstractCompilerMojo.java:695)
at org.apache.maven.plugin.compiler.CompilerMojo.execute(CompilerMojo.java:118)
at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:101)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:209)
... 19 more
Caused by: org.codehaus.plexus.compiler.CompilerException: java.lang.RuntimeException: java.lang.NullPointerException
at org.codehaus.plexus.compiler.javac.JavaxToolsCompiler.compileInProcess(JavaxToolsCompiler.java:191)
at org.codehaus.plexus.compiler.javac.JavacCompiler.performCompile(JavacCompiler.java:170)
at org.apache.maven.plugin.compiler.AbstractCompilerMojo.execute(AbstractCompilerMojo.java:684)
... 22 more
Caused by: java.lang.RuntimeException: java.lang.RuntimeException: java.lang.NullPointerException
at com.sun.tools.javac.main.Main.compile(Main.java:553)
at com.sun.tools.javac.api.JavacTaskImpl.doCall(JavacTaskImpl.java:129)
at com.sun.tools.javac.api.JavacTaskImpl.call(JavacTaskImpl.java:138)
at org.codehaus.plexus.compiler.javac.JavaxToolsCompiler.compileInProcess(JavaxToolsCompiler.java:126)
... 24 more
Caused by: java.lang.RuntimeException: java.lang.NullPointerException
at org.eclipse.persistence.internal.jpa.modelgen.CanonicalModelProcessor.process(CanonicalModelProcessor.java:407)
at com.sun.tools.javac.processing.JavacProcessingEnvironment.callProcessor(JavacProcessingEnvironment.java:794)
at com.sun.tools.javac.processing.JavacProcessingEnvironment.discoverAndRunProcs(JavacProcessingEnvironment.java:705)
at com.sun.tools.javac.processing.JavacProcessingEnvironment.access$1800(JavacProcessingEnvironment.java:91)
at com.sun.tools.javac.processing.JavacProcessingEnvironment$Round.run(JavacProcessingEnvironment.java:1035)
at com.sun.tools.javac.processing.JavacProcessingEnvironment.doProcessing(JavacProcessingEnvironment.java:1176)
at com.sun.tools.javac.main.JavaCompiler.processAnnotations(JavaCompiler.java:1170)
at com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:856)
at com.sun.tools.javac.main.Main.compile(Main.java:523)
... 27 more
Caused by: java.lang.NullPointerException
at org.eclipse.persistence.internal.jpa.metadata.MetadataDescriptor.getProject(MetadataDescriptor.java:1152)
at org.eclipse.persistence.internal.jpa.metadata.accessors.classes.ClassAccessor.<init>(ClassAccessor.java:274)
at org.eclipse.persistence.internal.jpa.metadata.accessors.classes.MappedSuperclassAccessor.<init>(MappedSuperclassAccessor.java:253)
at org.eclipse.persistence.internal.jpa.metadata.ORMetadata.reloadMappedSuperclass(ORMetadata.java:753)
at org.eclipse.persistence.internal.jpa.metadata.accessors.classes.ClassAccessor.addPotentialMappedSuperclass(ClassAccessor.java:564)
at org.eclipse.persistence.internal.jpa.metadata.accessors.classes.EmbeddableAccessor.discoverMappedSuperclassesAndInheritanceParents(EmbeddableAccessor.java:190)
at org.eclipse.persistence.internal.jpa.metadata.accessors.classes.EmbeddableAccessor.preProcess(EmbeddableAccessor.java:282)
at org.eclipse.persistence.internal.jpa.metadata.accessors.classes.ClassAccessor.addPotentialEmbeddableAccessor(ClassAccessor.java:510)
at org.eclipse.persistence.internal.jpa.metadata.accessors.classes.ClassAccessor.addAccessor(ClassAccessor.java:298)
at org.eclipse.persistence.internal.jpa.metadata.accessors.classes.ClassAccessor.addAccessorFields(ClassAccessor.java:436)
at org.eclipse.persistence.internal.jpa.metadata.accessors.classes.ClassAccessor.addAccessors(ClassAccessor.java:408)
at org.eclipse.persistence.internal.jpa.metadata.accessors.classes.ClassAccessor.preProcessForCanonicalModel(ClassAccessor.java:1238)
at org.eclipse.persistence.internal.jpa.modelgen.objects.PersistenceUnit.preProcessForCanonicalModel(PersistenceUnit.java:483)
at org.eclipse.persistence.internal.jpa.modelgen.CanonicalModelProcessor.process(CanonicalModelProcessor.java:400)
... 35 more
我在网上搜索过，但不知道为什么会这样。
有人知道吗？
最好的问候，
米海
【问题讨论】：
-
persistence.xml的错误来自项目方面的设置。
-
但是maven install的编译错误依然存在。
-
您在项目方面进行了哪些更改来解决它？我正在研究同样的问题。
-
发表评论太快了。只是我的 JPA 项目方面设置为 1.0。只需将其更改为正确的版本。
标签： java-ee-7 persistence.xml jpa-2.1