小编May*_*rma的帖子

假设我有一个类名"Test",我创建了该类的实例,我可以知道该实例的创建日期吗？

我正在批处理,我遇到了一个问题.我已经确定了我的问题的原因,但我无法解决它.

一旦我在我的pom中添加依赖项,我就会开始出错

maven依赖是

<dependency>
    <groupId>org.springframework.data</groupId>
    <artifactId>spring-data-jpa</artifactId>
</dependency>

我的pom如下所示

    <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.edf.fr.batch</groupId>
  <artifactId>edf-batch</artifactId>
  <version>0.0.1-SNAPSHOT</version>

  <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.6.RELEASE</version>
   </parent>

    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-batch</artifactId>
        </dependency>
        <dependency>
            <groupId>org.hsqldb</groupId>
            <artifactId>hsqldb</artifactId>
        </dependency>
        <dependency>
            <groupId>postgresql</groupId>
            <artifactId>postgresql</artifactId>
            <version>9.1-901-1.jdbc4</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.data</groupId>
            <artifactId>spring-data-jpa</artifactId>
        </dependency>

    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

我得到的错误是这个

java.lang.NoClassDefFoundError:org.springframework.data.jpa.util.BeanDefinitionUtils中的javax/persistence/EntityManagerFactory.(BeanDefinitionUtils.java:53)〜[spring-data-jpa-1.11.6.RELEASE.jar:na] at org.springframework.data.jpa.repository.support.EntityManagerBeanDefinitionRegistrarPostProcessor.postProcessBeanFactory(EntityManagerBeanDefinitionRegistrarPostProcessor.java:54)〜[spring-data-jpa-1.11.6.RELEASE.jar:na] at org.springframework.context.support.PostProcessorRegistrationDelegate .invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:281)〜[spring-context-4.3.10.RELEASE.jar:4.3.10.RELEASE] org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:176)〜[ spring-context-4.3.10.RELEASE.jar:4.3.10.RELEASE] at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:687)~ [spring-context-4.3.10.RELEASE.jar :4.3.10.RELEASE]在org.springframework.boot上的org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:525)〜[spring-context-4.3.10.RELEASE.jar:4.3.10.RELEASE]. SpringApplication.refresh(SpringApplication.java:693)[spring-boot-1.5.6.RELEASE.jar:1.5.6.RELEASE]在org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:360)[spring-boot -1.5.6.RELEASE.jar:1.5.6.RELEASE] at org.springframework.boot.SpringApplication.run(SpringApplication.java:303)[spring-boot-1.5.6.RELEASE.jar:1.5.6.RELEASE在org.springframework.boot.SpringApplication.run(SpringApplication.java:1118)[spring-boot-1.5.6.RELEASE.jar:1.5.6.RELEASE] org.springframework.boot.SpringApplication.run(SpringApplication. java:1107)[spring-boot-1.5.6.RELEASE.jar:1.5.6.RELEASE] at com.edf.fr.batch.MarcheBatchApplication.main(MarcheBatchApplication.java:10)[classes /:na]引起的:java.lang.ClassNotFoundException:java.ne中的javax.persistence.EntityManagerFactory t.URLClassLoader.findClass(URLClassLoader.java:381)〜[na:1.8.0_60] at java.lang.ClassLoader.loadClass(ClassLoader.java:424)〜[na:1.8.0_60] at sun.misc.Launcher …