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我正在学习在 Tomcat 上通过 RestEasy 使用 Spring、JPA 和 Hibernate。我已经尝试了一切,包括使用 JPA 2,但没有帮助。
这是堆栈跟踪:
---------- NFO: Hibernate 3.2.6 Oct 24, 2014 9:46:24 AM org.hibernate.cfg.Environment <clinit> INFO: hibernate.properties not
found Oct 24, 2014 9:46:24 AM org.hibernate.cfg.Environment
buildBytecodeProvider INFO: Bytecode provider name : cglib Oct 24,
2014 9:46:24 AM org.hibernate.cfg.Environment <clinit> INFO: using JDK
1.4 java.sql.Timestamp handling Oct 24, 2014 9:46:24 AM org.hibernate.ejb.Ejb3Configuration configure INFO: HHH000204:
Processing PersistenceUnitInfo [ name: contact ...] Oct 24, 2014
9:46:24 AM
org.springframework.web.context.support.XmlWebApplicationContext
refresh WARNING: Exception encountered during context initialization -
cancelling refresh attempt
org.springframework.beans.factory.BeanCreationException: Error
creating bean with name 'entityManagerFactory' defined in class path
resource [persistence-config.xml]: Invocation of init method failed;
nested exception is java.lang.NoSuchMethodError:
javax.persistence.spi.PersistenceUnitInfo.getValidationMode()Ljavax/persistence/ValidationMode;
at
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1568)
at
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:540)
at
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:476)
at
org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:302)
at
org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:229)
at
org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:298)
at
org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:193)
at
org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:956)
at
org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:747)
at
org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:480)
at
org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:403)
at
org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:306)
at
org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:106)
at
org.jboss.resteasy.plugins.spring.SpringContextLoaderListener.contextInitialized(SpringContextLoaderListener.java:48)
at
org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4973)
at
org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5467)
at
org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at
org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1559)
at
org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1549)
at java.util.concurrent.FutureTask.run(FutureTask.java:262) at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745) Caused by:
java.lang.NoSuchMethodError:
javax.persistence.spi.PersistenceUnitInfo.getValidationMode()Ljavax/persistence/ValidationMode;
at
org.hibernate.ejb.Ejb3Configuration.configure(Ejb3Configuration.java:641)
at
org.hibernate.ejb.HibernatePersistence.createContainerEntityManagerFactory(HibernatePersistence.java:75)
at
org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.createNativeEntityManagerFactory(LocalContainerEntityManagerFactoryBean.java:336)
at
org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.afterPropertiesSet(AbstractEntityManagerFactoryBean.java:318)
at
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1627)
at
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1564)
... 22 more
Oct 24, 2014 9:46:24 AM org.springframework.web.context.ContextLoader
initWebApplicationContext SEVERE: Context initialization failed
org.springframework.beans.factory.BeanCreationException: Error
creating bean with name 'entityManagerFactory' defined in class path
resource [persistence-config.xml]: Invocation of init method failed;
nested exception is java.lang.NoSuchMethodError:
javax.persistence.spi.PersistenceUnitInfo.getValidationMode()Ljavax/persistence/ValidationMode;
at
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1568)
at
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:540)
at
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:476)
at
org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:302)
at
org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:229)
at
org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:298)
at
org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:193)
at
org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:956)
at
org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:747)
at
org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:480)
at
org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:403)
at
org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:306)
at
org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:106)
at
org.jboss.resteasy.plugins.spring.SpringContextLoaderListener.contextInitialized(SpringContextLoaderListener.java:48)
at
org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4973)
at
org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5467)
at
org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at
org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1559)
at
org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1549)
at java.util.concurrent.FutureTask.run(FutureTask.java:262) at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745) Caused by:
java.lang.NoSuchMethodError:
javax.persistence.spi.PersistenceUnitInfo.getValidationMode()Ljavax/persistence/ValidationMode;
at
org.hibernate.ejb.Ejb3Configuration.configure(Ejb3Configuration.java:641)
at
org.hibernate.ejb.HibernatePersistence.createContainerEntityManagerFactory(HibernatePersistence.java:75)
at
org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.createNativeEntityManagerFactory(LocalContainerEntityManagerFactoryBean.java:336)
at
org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.afterPropertiesSet(AbstractEntityManagerFactoryBean.java:318)
at
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1627)
at
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1564)
... 22 more
Oct 24, 2014 9:46:24 AM org.apache.catalina.core.StandardContext
listenerStart SEVERE: Exception sending context initialized event to
listener instance of class
org.jboss.resteasy.plugins.spring.SpringContextLoaderListener
org.springframework.beans.factory.BeanCreationException: Error
creating bean with name 'entityManagerFactory' defined in class path
resource [persistence-config.xml]: Invocation of init method failed;
nested exception is java.lang.NoSuchMethodError:
javax.persistence.spi.PersistenceUnitInfo.getValidationMode()Ljavax/persistence/ValidationMode;
at
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1568)
at
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:540)
at
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:476)
at
org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:302)
at
org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:229)
at
org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:298)
at
org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:193)
at
org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:956)
at
org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:747)
at
org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:480)
at
org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:403)
at
org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:306)
at
org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:106)
at
org.jboss.resteasy.plugins.spring.SpringContextLoaderListener.contextInitialized(SpringContextLoaderListener.java:48)
at
org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4973)
at
org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5467)
at
org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at
org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1559)
at
org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1549)
at java.util.concurrent.FutureTask.run(FutureTask.java:262) at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745) Caused by:
java.lang.NoSuchMethodError:
javax.persistence.spi.PersistenceUnitInfo.getValidationMode()Ljavax/persistence/ValidationMode;
at
org.hibernate.ejb.Ejb3Configuration.configure(Ejb3Configuration.java:641)
at
org.hibernate.ejb.HibernatePersistence.createContainerEntityManagerFactory(HibernatePersistence.java:75)
at
org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.createNativeEntityManagerFactory(LocalContainerEntityManagerFactoryBean.java:336)
at
org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.afterPropertiesSet(AbstractEntityManagerFactoryBean.java:318)
at
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1627)
at
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1564)
... 22 more
<小时/>
<build>
<finalName>restbase</finalName>
</build>
<dependencies>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>4.1.0.RELEASE</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.11</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context-support</artifactId>
<version>4.0.7.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-aop</artifactId>
<version>4.1.1.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>4.1.1.RELEASE</version>
</dependency>
<dependency>
<groupId>org.jboss.resteasy</groupId>
<artifactId>resteasy-jaxrs</artifactId>
<version>3.0.9.Final</version>
</dependency>
<dependency>
<groupId>org.jboss.resteasy</groupId>
<artifactId>resteasy-spring</artifactId>
<version>3.0.9.Final</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-core</artifactId>
<version>4.2.1.Final</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-annotations</artifactId>
<version>3.3.1.GA</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-commons-annotations</artifactId>
<version>3.3.0.ga</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-entitymanager</artifactId>
<version>4.2.1.Final</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-jcl</artifactId>
<version>1.5.8</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.21</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-tx</artifactId>
<version>4.0.7.RELEASE</version>
</dependency>
<dependency>
<groupId>javax.transaction</groupId>
<artifactId>jta</artifactId>
<version>1.1</version>
</dependency>
<dependency>
<groupId>org.hibernate.javax.persistence</groupId>
<artifactId>hibernate-jpa-2.0-api</artifactId>
<version>1.0.1.Final</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-validator</artifactId>
<version>4.0.2.GA</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>ejb3-persistence</artifactId>
<version>3.3.2.Beta1</version>
<type>pom</type>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-orm</artifactId>
<version>4.0.7.RELEASE</version>
</dependency>
</dependencies>
<小时/><小时/>
/home/walker/workspace/restbase/target/classes:/usr/share/tomcat7/lib/tomcat-i18n-fr.jar:/usr/share/tomcat7/lib/annotations-api.jar:/usr/share/tomcat7/lib/tomcat-coyote.jar:/usr/share/tomcat7/lib/jasper-el.jar:/usr/share/tomcat7/lib/tomcat-jdbc.jar:/usr/share/tomcat7/lib/tomcat-api.jar:/usr/share/tomcat7/lib/tomcat-i18n-ja.jar:/usr/share/tomcat7/lib/commons-dbcp.jar:/usr/share/tomcat7/lib/catalina-ant.jar:/usr/share/tomcat7/lib/commons-pool.jar:/usr/share/tomcat7/lib/jasper.jar:/usr/share/tomcat7/lib/tomcat-i18n-es.jar:/usr/share/tomcat7/lib/servlet-api.jar:/usr/share/tomcat7/lib/el-api.jar:/usr/share/tomcat7/lib/catalina-tribes.jar:/usr/share/tomcat7/lib/jsp-api.jar:/usr/share/tomcat7/lib/catalina.jar:/usr/share/tomcat7/lib/catalina-ha.jar:/usr/share/tomcat7/lib/tomcat-util.jar:/home/walker/.m2/repository/org/springframework/spring-webmvc/4.1.0.RELEASE/spring-webmvc-4.1.0.RELEASE.jar:/home/walker/.m2/repository/org/springframework/spring-beans/4.1.0.RELEASE/spring-beans-4.1.0.RELEASE.jar:/home/walker/.m2/repository/org/springframework/spring-context/4.1.0.RELEASE/spring-context-4.1.0.RELEASE.jar:/home/walker/.m2/repository/org/springframework/spring-expression/4.1.0.RELEASE/spring-expression-4.1.0.RELEASE.jar:/home/walker/.m2/repository/org/springframework/spring-web/4.1.0.RELEASE/spring-web-4.1.0.RELEASE.jar:/home/walker/.m2/repository/junit/junit/4.11/junit-4.11.jar:/home/walker/.m2/repository/org/hamcrest/hamcrest-core/1.3/hamcrest-core-1.3.jar:/home/walker/.m2/repository/org/springframework/spring-context-support/4.0.7.RELEASE/spring-context-support-4.0.7.RELEASE.jar:/home/walker/.m2/repository/org/springframework/spring-aop/4.1.1.RELEASE/spring-aop-4.1.1.RELEASE.jar:/home/walker/.m2/repository/aopalliance/aopalliance/1.0/aopalliance-1.0.jar:/home/walker/.m2/repository/org/springframework/spring-core/4.1.1.RELEASE/spring-core-4.1.1.RELEASE.jar:/home/walker/.m2/repository/commons-logging/commons-logging/1.1.3/commons-logging-1.1.3.jar:/home/walker/.m2/repository/org/jboss/resteasy/resteasy-jaxrs/3.0.9.Final/resteasy-jaxrs-3.0.9.Final.jar:/home/walker/.m2/repository/org/jboss/resteasy/jaxrs-api/3.0.9.Final/jaxrs-api-3.0.9.Final.jar:/home/walker/.m2/repository/org/jboss/spec/javax/annotation/jboss-annotations-api_1.1_spec/1.0.1.Final/jboss-annotations-api_1.1_spec-1.0.1.Final.jar:/home/walker/.m2/repository/javax/activation/activation/1.1/activation-1.1.jar:/home/walker/.m2/repository/org/apache/httpcomponents/httpclient/4.2.6/httpclient-4.2.6.jar:/home/walker/.m2/repository/org/apache/httpcomponents/httpcore/4.2.5/httpcore-4.2.5.jar:/home/walker/.m2/repository/commons-codec/commons-codec/1.6/commons-codec-1.6.jar:/home/walker/.m2/repository/commons-io/commons-io/2.1/commons-io-2.1.jar:/home/walker/.m2/repository/net/jcip/jcip-annotations/1.0/jcip-annotations-1.0.jar:/home/walker/.m2/repository/org/jboss/resteasy/resteasy-spring/3.0.9.Final/resteasy-spring-3.0.9.Final.jar:/home/walker/.m2/repository/org/jboss/resteasy/resteasy-jettison-provider/3.0.9.Final/resteasy-jettison-provider-3.0.9.Final.jar:/home/walker/.m2/repository/org/jboss/resteasy/resteasy-jaxb-provider/3.0.9.Final/resteasy-jaxb-provider-3.0.9.Final.jar:/home/walker/.m2/repository/org/codehaus/jettison/jettison/1.3.2/jettison-1.3.2.jar:/home/walker/.m2/repository/org/hibernate/hibernate-core/4.2.1.Final/hibernate-core-4.2.1.Final.jar:/home/walker/.m2/repository/antlr/antlr/2.7.7/antlr-2.7.7.jar:/home/walker/.m2/repository/org/jboss/logging/jboss-logging/3.1.0.GA/jboss-logging-3.1.0.GA.jar:/home/walker/.m2/repository/dom4j/dom4j/1.6.1/dom4j-1.6.1.jar:/home/walker/.m2/repository/org/jboss/spec/javax/transaction/jboss-transaction-api_1.1_spec/1.0.1.Final/jboss-transaction-api_1.1_spec-1.0.1.Final.jar:/home/walker/.m2/repository/org/javassist/javassist/3.15.0-GA/javassist-3.15.0-GA.jar:/home/walker/.m2/repository/org/hibernate/common/hibernate-commons-annotations/4.0.1.Final/hibernate-commons-annotations-4.0.1.Final.jar:/home/walker/.m2/repository/org/hibernate/hibernate-annotations/3.3.1.GA/hibernate-annotations-3.3.1.GA.jar:/home/walker/.m2/repository/org
/hibernate/hibernate/3.2.6.ga/hibernate-3.2.6.ga.jar:/home/walker/.m2/repository/net/sf/ehcache/ehcache/1.2.3/ehcache-1.2.3.jar:/home/walker/.m2/repository/asm/asm-attrs/1.5.3/asm-attrs-1.5.3.jar:/home/walker/.m2/repository/cglib/cglib/2.1_3/cglib-2.1_3.jar:/home/walker/.m2/repository/asm/asm/1.5.3/asm-1.5.3.jar:/home/walker/.m2/repository/commons-collections/commons-collections/2.1.1/commons-collections-2.1.1.jar:/home/walker/.m2/repository/org/hibernate/hibernate-commons-annotations/3.0.0.ga/hibernate-commons-annotations-3.0.0.ga.jar:/home/walker/.m2/repository/org/hibernate/ejb3-persistence/1.0.1.GA/ejb3-persistence-1.0.1.GA.jar:/home/walker/.m2/repository/org/hibernate/hibernate-entitymanager/4.2.1.Final/hibernate-entitymanager-4.2.1.Final.jar:/home/walker/.m2/repository/org/slf4j/slf4j-jcl/1.5.8/slf4j-jcl-1.5.8.jar:/home/walker/.m2/repository/org/slf4j/slf4j-api/1.5.8/slf4j-api-1.5.8.jar:/home/walker/.m2/repository/mysql/mysql-connector-java/5.1.21/mysql-connector-java-5.1.21.jar:/home/walker/.m2/repository/org/springframework/spring-tx/4.0.7.RELEASE/spring-tx-4.0.7.RELEASE.jar:/home/walker/.m2/repository/javax/transaction/jta/1.1/jta-1.1.jar:/home/walker/.m2/repository/org/hibernate/javax/persistence/hibernate-jpa-2.0-api/1.0.1.Final/hibernate-jpa-2.0-api-1.0.1.Final.jar:/home/walker/.m2/repository/org/hibernate/hibernate-validator/4.0.2.GA/hibernate-validator-4.0.2.GA.jar:/home/walker/.m2/repository/javax/validation/validation-api/1.0.0.GA/validation-api-1.0.0.GA.jar:/home/walker/.m2/repository/javax/xml/bind/jaxb-api/2.1/jaxb-api-2.1.jar:/home/walker/.m2/repository/javax/xml/stream/stax-api/1.0-2/stax-api-1.0-2.jar:/home/walker/.m2/repository/com/sun/xml/bind/jaxb-impl/2.1.3/jaxb-impl-2.1.3.jar:/home/walker/.m2/repository/org/springframework/spring-orm/4.0.7.RELEASE/spring-orm-4.0.7.RELEASE.jar:/home/walker/.m2/repository/org/springframework/spring-jdbc/4.0.7.RELEASE/spring-jdbc-4.0.7.RELEASE.jar
最佳答案
类路径中有“org.hibernate:ejb3-persistence:pom:3.3.2.Beta1:compile”,这(看起来)是 JPA 1.0 API。
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一直提示输入 1 到 10 的数字 - 结果应将 st、rd、th 和 nd 添加到数字中。编写一个程序,提示用户输入 1 到 10 之间的任意整数,然后以序数形式显示该整数并附加后缀。 public
我有这个 DownloadFile.java 并按预期下载该文件: import java.io.*; import java.net.URL; public class DownloadFile {
我想在 GUI 上添加延迟。我放置了 2 个 for 循环,然后重新绘制了一个标签,但这 2 个 for 循环一个接一个地执行,并且标签被重新绘制到最后一个。 我能做什么? for(int i=0;
我正在对对象 Student 的列表项进行一些测试,但是我更喜欢在 java 类对象中创建硬编码列表,然后从那里提取数据,而不是连接到数据库并在结果集中选择记录。然而,自从我这样做以来已经很长时间了,
我知道对象创建分为三个部分: 声明 实例化 初始化 classA{} classB extends classA{} classA obj = new classB(1,1); 实例化 它必须使用
我有兴趣使用 GPRS 构建车辆跟踪系统。但是,我有一些问题要问以前做过此操作的人: GPRS 是最好的技术吗?人们意识到任何问题吗? 我计划使用 Java/Java EE - 有更好的技术吗? 如果
我可以通过递归方法反转数组,例如:数组={1,2,3,4,5} 数组结果={5,4,3,2,1}但我的结果是相同的数组,我不知道为什么,请帮助我。 public class Recursion { p
有这样的标准方式吗? 包括 Java源代码-测试代码- Ant 或 Maven联合单元持续集成(可能是巡航控制)ClearCase 版本控制工具部署到应用服务器 最后我希望有一个自动构建和集成环境。
我什至不知道这是否可能,我非常怀疑它是否可能,但如果可以,您能告诉我怎么做吗?我只是想知道如何从打印机打印一些文本。 有什么想法吗? 最佳答案 这里有更简单的事情。 import javax.swin
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