Databases
StackOverflow2013
Postsdbo
POHibernate EntityManager not being injected - NullPointer
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POHibernate EntityManager not being injected - NullPointer
    primarykey
    data
    text
    <p>I'm trying to use Hibernate and JPA in a Spring project but I have problems injecting the EntityManager. When I deploy the site and I open it, I get Request processing failed; nested exception is java.lang.NullPointerException because the manager is always null.</p> <p>This are my config files:</p> <p>pom.xml</p> <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt; &lt;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/maven-v4_0_0.xsd"&gt; &lt;modelVersion&gt;4.0.0&lt;/modelVersion&gt; &lt;groupId&gt;com.foo&lt;/groupId&gt; &lt;artifactId&gt;artifact&lt;/artifactId&gt; &lt;name&gt;name&lt;/name&gt; &lt;packaging&gt;war&lt;/packaging&gt; &lt;version&gt;1.0.0-BUILD-SNAPSHOT&lt;/version&gt; &lt;properties&gt; &lt;java-version&gt;1.6&lt;/java-version&gt; &lt;org.springframework-version&gt;3.2.2.RELEASE&lt;/org.springframework-version&gt; &lt;org.aspectj-version&gt;1.7.1&lt;/org.aspectj-version&gt; &lt;org.slf4j-version&gt;1.7.2&lt;/org.slf4j-version&gt; &lt;/properties&gt; &lt;dependencies&gt; &lt;!-- Spring --&gt; &lt;dependency&gt; &lt;groupId&gt;org.springframework&lt;/groupId&gt; &lt;artifactId&gt;spring-context&lt;/artifactId&gt; &lt;version&gt;${org.springframework-version}&lt;/version&gt; &lt;exclusions&gt; &lt;!-- Exclude Commons Logging in favor of SLF4j --&gt; &lt;exclusion&gt; &lt;groupId&gt;commons-logging&lt;/groupId&gt; &lt;artifactId&gt;commons-logging&lt;/artifactId&gt; &lt;/exclusion&gt; &lt;/exclusions&gt; &lt;/dependency&gt; &lt;dependency&gt; &lt;groupId&gt;org.springframework&lt;/groupId&gt; &lt;artifactId&gt;spring-webmvc&lt;/artifactId&gt; &lt;version&gt;${org.springframework-version}&lt;/version&gt; &lt;/dependency&gt; &lt;!-- AspectJ --&gt; &lt;dependency&gt; &lt;groupId&gt;org.aspectj&lt;/groupId&gt; &lt;artifactId&gt;aspectjrt&lt;/artifactId&gt; &lt;version&gt;${org.aspectj-version}&lt;/version&gt; &lt;/dependency&gt; &lt;!-- Database --&gt; &lt;dependency&gt; &lt;groupId&gt;mysql&lt;/groupId&gt; &lt;artifactId&gt;mysql-connector-java&lt;/artifactId&gt; &lt;version&gt;5.1.24&lt;/version&gt; &lt;/dependency&gt; &lt;dependency&gt; &lt;groupId&gt;org.hibernate&lt;/groupId&gt; &lt;artifactId&gt;hibernate-entitymanager&lt;/artifactId&gt; &lt;version&gt;4.2.0.Final&lt;/version&gt; &lt;/dependency&gt; &lt;dependency&gt; &lt;groupId&gt;org.hibernate.javax.persistence&lt;/groupId&gt; &lt;artifactId&gt;hibernate-jpa-2.0-api&lt;/artifactId&gt; &lt;version&gt;1.0.1.Final&lt;/version&gt; &lt;/dependency&gt; &lt;dependency&gt; &lt;groupId&gt;org.springframework&lt;/groupId&gt; &lt;artifactId&gt;spring-orm&lt;/artifactId&gt; &lt;version&gt;3.2.0.RELEASE&lt;/version&gt; &lt;!-- will come with all needed Spring dependencies such as spring-core and spring-beans --&gt; &lt;/dependency&gt; &lt;dependency&gt; &lt;groupId&gt;org.hibernate&lt;/groupId&gt; &lt;artifactId&gt;hibernate-entitymanager&lt;/artifactId&gt; &lt;version&gt;4.1.9.Final&lt;/version&gt; &lt;!-- will come with Hibernate core --&gt; &lt;/dependency&gt; &lt;dependency&gt; &lt;groupId&gt;commons-dbcp&lt;/groupId&gt; &lt;artifactId&gt;commons-dbcp&lt;/artifactId&gt; &lt;version&gt;20030825.184428&lt;/version&gt; &lt;type&gt;jar&lt;/type&gt; &lt;scope&gt;compile&lt;/scope&gt; &lt;/dependency&gt; &lt;dependency&gt; &lt;groupId&gt;commons-pool&lt;/groupId&gt; &lt;artifactId&gt;commons-pool&lt;/artifactId&gt; &lt;version&gt;20030825.183949&lt;/version&gt; &lt;type&gt;jar&lt;/type&gt; &lt;scope&gt;compile&lt;/scope&gt; &lt;/dependency&gt; &lt;dependency&gt; &lt;groupId&gt;commons-collections&lt;/groupId&gt; &lt;artifactId&gt;commons-collections&lt;/artifactId&gt; &lt;version&gt;3.1&lt;/version&gt; &lt;/dependency&gt; &lt;!-- Logging --&gt; &lt;dependency&gt; &lt;groupId&gt;org.slf4j&lt;/groupId&gt; &lt;artifactId&gt;slf4j-api&lt;/artifactId&gt; &lt;version&gt;${org.slf4j-version}&lt;/version&gt; &lt;/dependency&gt; &lt;dependency&gt; &lt;groupId&gt;org.slf4j&lt;/groupId&gt; &lt;artifactId&gt;jcl-over-slf4j&lt;/artifactId&gt; &lt;version&gt;${org.slf4j-version}&lt;/version&gt; &lt;scope&gt;runtime&lt;/scope&gt; &lt;/dependency&gt; &lt;dependency&gt; &lt;groupId&gt;org.slf4j&lt;/groupId&gt; &lt;artifactId&gt;slf4j-log4j12&lt;/artifactId&gt; &lt;version&gt;${org.slf4j-version}&lt;/version&gt; &lt;scope&gt;runtime&lt;/scope&gt; &lt;/dependency&gt; &lt;dependency&gt; &lt;groupId&gt;log4j&lt;/groupId&gt; &lt;artifactId&gt;log4j&lt;/artifactId&gt; &lt;version&gt;1.2.17&lt;/version&gt; &lt;exclusions&gt; &lt;exclusion&gt; &lt;groupId&gt;javax.mail&lt;/groupId&gt; &lt;artifactId&gt;mail&lt;/artifactId&gt; &lt;/exclusion&gt; &lt;exclusion&gt; &lt;groupId&gt;javax.jms&lt;/groupId&gt; &lt;artifactId&gt;jms&lt;/artifactId&gt; &lt;/exclusion&gt; &lt;exclusion&gt; &lt;groupId&gt;com.sun.jdmk&lt;/groupId&gt; &lt;artifactId&gt;jmxtools&lt;/artifactId&gt; &lt;/exclusion&gt; &lt;exclusion&gt; &lt;groupId&gt;com.sun.jmx&lt;/groupId&gt; &lt;artifactId&gt;jmxri&lt;/artifactId&gt; &lt;/exclusion&gt; &lt;/exclusions&gt; &lt;scope&gt;runtime&lt;/scope&gt; &lt;/dependency&gt; &lt;!-- @Inject --&gt; &lt;dependency&gt; &lt;groupId&gt;javax.inject&lt;/groupId&gt; &lt;artifactId&gt;javax.inject&lt;/artifactId&gt; &lt;version&gt;1&lt;/version&gt; &lt;/dependency&gt; &lt;!-- Servlet --&gt; &lt;dependency&gt; &lt;groupId&gt;javax.servlet&lt;/groupId&gt; &lt;artifactId&gt;servlet-api&lt;/artifactId&gt; &lt;version&gt;2.5&lt;/version&gt; &lt;scope&gt;provided&lt;/scope&gt; &lt;/dependency&gt; &lt;dependency&gt; &lt;groupId&gt;javax.servlet.jsp&lt;/groupId&gt; &lt;artifactId&gt;jsp-api&lt;/artifactId&gt; &lt;version&gt;2.1&lt;/version&gt; &lt;scope&gt;provided&lt;/scope&gt; &lt;/dependency&gt; &lt;dependency&gt; &lt;groupId&gt;javax.servlet&lt;/groupId&gt; &lt;artifactId&gt;jstl&lt;/artifactId&gt; &lt;version&gt;1.2&lt;/version&gt; &lt;/dependency&gt; &lt;!-- Test --&gt; &lt;dependency&gt; &lt;groupId&gt;junit&lt;/groupId&gt; &lt;artifactId&gt;junit&lt;/artifactId&gt; &lt;version&gt;4.11&lt;/version&gt; &lt;scope&gt;test&lt;/scope&gt; &lt;/dependency&gt; &lt;!-- Validation --&gt; &lt;dependency&gt; &lt;groupId&gt;javax.validation&lt;/groupId&gt; &lt;artifactId&gt;validation-api&lt;/artifactId&gt; &lt;version&gt;1.0.0.GA&lt;/version&gt; &lt;scope&gt;compile&lt;/scope&gt; &lt;/dependency&gt; &lt;dependency&gt; &lt;groupId&gt;org.hibernate&lt;/groupId&gt; &lt;artifactId&gt;hibernate-validator&lt;/artifactId&gt; &lt;version&gt;4.0.0.GA&lt;/version&gt; &lt;scope&gt;compile&lt;/scope&gt; &lt;/dependency&gt; &lt;/dependencies&gt; &lt;build&gt; &lt;finalName&gt;ROOT&lt;/finalName&gt; &lt;plugins&gt; &lt;plugin&gt; &lt;artifactId&gt;maven-eclipse-plugin&lt;/artifactId&gt; &lt;version&gt;2.9&lt;/version&gt; &lt;configuration&gt; &lt;additionalProjectnatures&gt; &lt;projectnature&gt;org.springframework.ide.eclipse.core.springnature&lt;/projectnature&gt; &lt;/additionalProjectnatures&gt; &lt;additionalBuildcommands&gt; &lt;buildcommand&gt;org.springframework.ide.eclipse.core.springbuilder&lt;/buildcommand&gt; &lt;/additionalBuildcommands&gt; &lt;downloadSources&gt;true&lt;/downloadSources&gt; &lt;downloadJavadocs&gt;true&lt;/downloadJavadocs&gt; &lt;/configuration&gt; &lt;/plugin&gt; &lt;plugin&gt; &lt;groupId&gt;org.apache.maven.plugins&lt;/groupId&gt; &lt;artifactId&gt;maven-compiler-plugin&lt;/artifactId&gt; &lt;version&gt;2.5.1&lt;/version&gt; &lt;configuration&gt; &lt;source&gt;1.6&lt;/source&gt; &lt;target&gt;1.6&lt;/target&gt; &lt;compilerArgument&gt;-Xlint:all&lt;/compilerArgument&gt; &lt;showWarnings&gt;true&lt;/showWarnings&gt; &lt;showDeprecation&gt;true&lt;/showDeprecation&gt; &lt;/configuration&gt; &lt;/plugin&gt; &lt;plugin&gt; &lt;groupId&gt;org.codehaus.mojo&lt;/groupId&gt; &lt;artifactId&gt;exec-maven-plugin&lt;/artifactId&gt; &lt;version&gt;1.2.1&lt;/version&gt; &lt;configuration&gt; &lt;mainClass&gt;org.test.int1.Main&lt;/mainClass&gt; &lt;/configuration&gt; &lt;/plugin&gt; &lt;/plugins&gt; &lt;/build&gt; &lt;/project&gt; </code></pre> <p>web.xml</p> <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt; &lt;web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"&gt; &lt;display-name&gt;Display name&lt;/display-name&gt; &lt;!-- The definition of the Root Spring Container shared by all Servlets and Filters --&gt; &lt;context-param&gt; &lt;param-name&gt;contextConfigLocation&lt;/param-name&gt; &lt;param-value&gt;/WEB-INF/spring/root-context.xml&lt;/param-value&gt; &lt;/context-param&gt; &lt;!-- Creates the Spring Container shared by all Servlets and Filters --&gt; &lt;listener&gt; &lt;listener-class&gt;org.springframework.web.context.ContextLoaderListener&lt;/listener-class&gt; &lt;/listener&gt; &lt;!-- Processes application requests --&gt; &lt;servlet&gt; &lt;servlet-name&gt;appServlet&lt;/servlet-name&gt; &lt;servlet-class&gt;org.springframework.web.servlet.DispatcherServlet&lt;/servlet-class&gt; &lt;init-param&gt; &lt;param-name&gt;contextConfigLocation&lt;/param-name&gt; &lt;param-value&gt;/WEB-INF/spring/appServlet/servlet-context.xml&lt;/param-value&gt; &lt;/init-param&gt; &lt;load-on-startup&gt;1&lt;/load-on-startup&gt; &lt;/servlet&gt; &lt;servlet-mapping&gt; &lt;servlet-name&gt;appServlet&lt;/servlet-name&gt; &lt;url-pattern&gt;/&lt;/url-pattern&gt; &lt;/servlet-mapping&gt; &lt;/web-app&gt; </code></pre> <p>root-context.xml</p> <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt; &lt;beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:tx="http://www.springframework.org/schema/tx" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd"&gt; &lt;!-- Root Context: defines shared resources visible to all other web components --&gt; &lt;import resource="db.xml" /&gt; &lt;/beans&gt; </code></pre> <p>db.xml</p> <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt; &lt;beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd" default-autowire="byName"&gt; &lt;!-- Scans within the base package of the application for @Components to configure as beans --&gt; &lt;bean id="placeholderConfig" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer"&gt; &lt;property name="location" value="classpath:db.properties" /&gt; &lt;/bean&gt; &lt;bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean"&gt; &lt;property name="dataSource" ref="dataSource" /&gt; &lt;property name="jpaVendorAdapter"&gt; &lt;bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter"&gt; &lt;property name="showSql" value="true" /&gt; &lt;property name="generateDdl" value="true" /&gt; &lt;property name="databasePlatform" value="${db.dialect}" /&gt; &lt;/bean&gt; &lt;/property&gt; &lt;/bean&gt; &lt;bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close"&gt; &lt;property name="driverClassName" value="${db.driver}" /&gt; &lt;property name="url" value="${db.url}" /&gt; &lt;property name="username" value="${db.username}" /&gt; &lt;property name="password" value="${db.password}" /&gt; &lt;/bean&gt; &lt;bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager"&gt; &lt;property name="entityManagerFactory" ref="entityManagerFactory" /&gt; &lt;/bean&gt; &lt;tx:annotation-driven transaction-manager="transactionManager"/&gt; &lt;bean class="org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor" /&gt; &lt;/beans&gt; </code></pre> <p>persistence.xml</p> <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt; &lt;persistence xmlns="http://java.sun.com/xml/ns/persistence" 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_1_0.xsd" version="1.0"&gt; &lt;persistence-unit name="persistenceUnit" transaction-type="RESOURCE_LOCAL"&gt; &lt;provider&gt;org.hibernate.ejb.HibernatePersistence&lt;/provider&gt; &lt;properties&gt; &lt;property name="hibernate.hbm2ddl.auto" value="create-drop" /&gt; &lt;property name="hibernate.show_sql" value="true" /&gt; &lt;property name="hibernate.transaction.flush_before_completion" value="true" /&gt; &lt;property name="hibernate.cache.provider_class" value="org.hibernate.cache.HashtableCacheProvider" /&gt; &lt;/properties&gt; &lt;/persistence-unit&gt; &lt;/persistence&gt; </code></pre> <p>db.properties</p> <pre><code>db.password=pass db.username=user db.url=jdbc:mysql://url:3306/dbname db.dialect=org.hibernate.dialect.MySQLInnoDBDialect db.driver=com.mysql.jdbc.Driver </code></pre> <p>TagServiceImpl.java</p> <pre><code>@Repository @Transactional public class TagServiceImpl implements TagService { @PersistenceContext private EntityManager manager; @Override @Transactional public List&lt;Tag&gt; findAll() { List &lt;Tag&gt; tags = manager.creationQuery("select t from Tag t").getResultList(); // Exception raised here ModelAndView mav = new ModelAndView("tags"); mav.addObject("tags", tags); return tags; } } </code></pre> <p>TagController.java</p> <pre><code>@Controller public class TagController { /** * Simply selects the home view to render by returning its name. */ @RequestMapping(value = "/", method = RequestMethod.GET) public ModelAndView home(Locale locale) { ModelAndView modelAndView = new ModelAndView("tags"); TagService tagService = new TagServiceImpl(); List&lt;Tag&gt; tags = tagService.findAll(); modelAndView.addObject("tags", tags); return modelAndView; } } </code></pre> <p>I'm very new to Spring but I don't see what I'm doing wrong so I hope you could help me. I more info is needed just ask. Thank you in advance.</p>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USDavid Moreno García
    1. USDavid Moreno García
    plurals
    1. PL
      singulars
      1. LTLinked
    1. PL
      singulars
      1. LTLinked
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    3. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. This table or related slice is empty.
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload