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PONull Pointer Exception Entity Manager
 

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    <p>I am getting a Null Pointer exception when i try to persist and Account. Turns out the <code>entityManager</code> is null but I can't figure out why. Here is the relevant code, any ideas? I have tried to do </p> <pre><code>package com.test.bank2.account; import org.springframework.transaction.annotation.Transactional; import javax.persistence.EntityManager; import javax.persistence.PersistenceContext; @Transactional public class AccountRepositoryImpl implements AccountRepository{ @PersistenceContext(unitName = "entityManagerFactory") private EntityManager entityManager; @Override public void save(Account account) { entityManager.persist(account); } } </code></pre> <p>and the config:</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:jpa="http://www.springframework.org/schema/data/jpa" xmlns:jdbc="http://www.springframework.org/schema/jdbc" 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/data/jpa http://www.springframework.org/schema/data/jpa/spring-jpa.xsd http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-3.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd"&gt; &lt;jdbc:embedded-database id="dataSource"&gt; &lt;jdbc:script location="classpath:setup.sql"/&gt; &lt;/jdbc:embedded-database&gt; &lt;bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean"&gt; &lt;property name="dataSource" ref="dataSource" /&gt; &lt;property name="packagesToScan" value="com.test.bank2" /&gt; &lt;property name="jpaPropertyMap"&gt; &lt;map&gt; &lt;entry key="eclipselink.weaving" value="false"/&gt; &lt;entry key="eclipselink.ddl-generation" value="create-tables"/&gt; &lt;entry key="eclipselink.target-database" value="org.eclipse.persistence.platform.database.HSQLPlatform"/&gt; &lt;/map&gt; &lt;/property&gt; &lt;property name="jpaVendorAdapter"&gt; &lt;bean class="org.springframework.orm.jpa.vendor.EclipseLinkJpaVendorAdapter" &gt; &lt;property name="databasePlatform" value="org.eclipse.persistence.platform.database.HSQLPlatform" /&gt; &lt;property name="generateDdl" value="true" /&gt; &lt;/bean&gt; &lt;/property&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;/beans&gt; </code></pre>
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    1. COThis may help you: http://stackoverflow.com/questions/4708035/persistencecontext-entitymanager-injection-nullpointerexception
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