当我正在运行测试用例时，实体管理器被成功注入，但在运行web应用程序时抛出NullPointerException [英] when I am running test cases that time entity manager is injected successfully but while running web app its throwing NullPointerException
本文介绍了当我正在运行测试用例时，实体管理器被成功注入，但在运行web应用程序时抛出NullPointerException的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
这是abstractRepository我在哪里注入entityManager
package com.ajit.retail.repository;
导入javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import javax.persistence.PersistenceContextType;
public class AbstractRepository {
@PersistenceContext（type = PersistenceContextType.EXTENDED）
EntityManager entityManager;
}
这是我使用实体管理器的存储库
package com.ajit.retail.repository;
import com.ajit.retail.exception.InvalidIdException;
import com.ajit.retail.model.Buyer;
import org.springframework.stereotype.Repository;
import javax.persistence.NoResultException;
@Repository
公共类BuyerRepo扩展AbstractRepository {
$ b $公共买方getBuyer（字符串买方名称）throws InvalidIdException {
javax.persistence.Query buyerId = entityManager .createNativeQuery（从买方b选择b.buyer_id，其中b.name =：name）。setParameter（name，buyerName）;
整数ID;
尝试{
id =（Integer）buyerId.getSingleResult（）;
} catch（NoResultException e）{
return null;
}
return getBuyer（id）;
买方getBuyer（long buyerId）抛出InvalidIdException {
Buyer Buyer = entityManager.find（Buyer.class，buyerId）; ** ====> NULL **
if（buyer == null）抛出新的InvalidIdException（无效的文章ID）;
退货买家;
$ b $ p
$ b 这是我调用存储库方法的控制器
package com.ajit.retail.web;
import com.sun.jersey.spi.inject.Inject;
import com.ajit.retail.exception.InvalidIdException;
import com.ajit.retail.model.Buyer;
import com.ajit.retail.repository。*;
import org.springframework.stereotype.Component;
import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.core.MediaType;
@Path（/ buyer）
@Component
public class BuyerController {
@Inject
BuyerRepo buyerRepo;
@GET
@Produces（MediaType.APPLICATION_JSON）
公共采购员searchFields（）抛出InvalidIdException {
字符串buyerId =51;
买方买方;
尝试{
买方= buyerRepo.getBuyer（Long.parseLong（buyerId））;
} catch（NumberFormatException e）{
buyer = buyerRepo.getBuyer（buyerId）;
}
return buyer;
这些是传递的单元测试
package com.ajit.retail.repository;
import com.ajit。 retail.exception.InvalidIdException;
import org.hamcrest.core.IsEqual;
导入org.junit.Before;
import org.junit.Test;
import org.springframework.beans.factory.annotation.Autowired;
import static org.junit.Assert.assertThat;
公共类BuyerRepoTest扩展BaseRepository {
$ b $ @Autowired
私有BuyerRepo buyerRepo;
@Test
public void shouldGiveNameOfGivenBuyerId（）throws InvalidIdException {
assertThat（buyerRepo.getBuyer（2）.getName（），IsEqual.equalTo（SupervisorDLS））;
@Test（expected = InvalidIdException.class）
public void shouldThrowExceptionForInvalidBuyerId（）抛出InvalidIdException {
buyerRepo.getBuyer（-10）;
这是基础存储库
package com.ajit.retail.repository;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.AbstractTransactionalJUnit4SpringContextTests;
@ContextConfiguration（locations = {classpath：applicationContext.xml}）
public class BaseRepository extends AbstractTransactionalJUnit4SpringContextTests {
}
这是applicationContext.xml
<？xml version =1.0encoding =UTF-8？>
< beans xmlns =http://www.springframework.org/schema/beans
xmlns：xsi =http://www.w3.org/2001/XMLSchema-instance
xmlns：context =http://www.springframework.org/schema/context
xmlns：tx =http://www.springframework.org/schema/txxmlns：mvc = http://www.springframework.org/schema/mvc
xsi：schemaLocation =http://www.springframework.org/schema/beans
http://www.springframework.org/ schema / beans / spring-beans-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-2.5.xsd\">
< context：annotation-config />
< context：component-scan base-package =com.ajit.retail/>
< bean id =dataSourceclass =org.springframework.jdbc.datasource.DriverManagerDataSource>
< property name =driverClassNamevalue =org.postgresql.Driver/>
< property name =urlvalue =jdbc：postgresql：// localhost / retail/>
< property name =usernamevalue =retail_user/>
< property name =passwordvalue =password/>
< / bean>
< bean id =entityManagerclass =org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean>
< property name =dataSourceref =dataSource/>
< property name =packagesToScanvalue =com.ajit.retail/>
< property name =jpaVendorAdapter>
< bean class =org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter>
< property name =showSqlvalue =true/>
< property name =databasePlatformvalue =org.hibernate.dialect.PostgreSQLDialect/>
< / bean>
< / property>
< / bean>
< bean id =transactionManagerclass =org.springframework.orm.jpa.JpaTransactionManager>
< property name =entityManagerFactoryref =entityManager/>
< / bean>
< tx：注解驱动的事务管理器=transactionManager/>
< / beans>
请帮助！
< servlet>替换为
< servlet-name>零售< / servlet-name>
**< servlet-class> com.sun.jersey.spi.container.servlet.ServletContainer< / servlet-class> **
< init-param> ;
< param-name> com.sun.jersey.config.property.packages< / param-name>
< param-value> com.ajit.retail.web< / param-value>
< / init-param>
< init-param>
< param-name> com.sun.jersey.api.json.POJOMappingFeature< / param-name>
< param-value> true< /参数值>
< / init-param>
<加载启动> 1< /加载启动>
< / servlet>
with
< servlet的>
< servlet-name>零售< / servlet-name>
**< servlet-class> com.sun.jersey.spi.spring.container.servlet.SpringServlet< / servlet-class> **
< init -param>
< param-name> com.sun.jersey.config.property.packages< / param-name>
< param-value> com.ajit.retail.web< / param-value>
< / init-param>
< init-param>
< param-name> com.sun.jersey.api.json.POJOMappingFeature< / param-name>
< param-value> true< /参数值>
< / init-param>
<加载启动> 1< /加载启动>
< / servlet>
I have a strange problem. I am injecting the entity manager using PersistenceContext using applicatioContext bean. But problem is that when I am running test cases that time entity manager is injected successfully but while running web app its throwing NullPointerException
this is abstractRepository where I am injecting entityManager
package com.ajit.retail.repository;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import javax.persistence.PersistenceContextType;
public class AbstractRepository {
@PersistenceContext(type = PersistenceContextType.EXTENDED)
EntityManager entityManager;
}
this is my repository where I am using entity manager
package com.ajit.retail.repository;
import com.ajit.retail.exception.InvalidIdException;
import com.ajit.retail.model.Buyer;
import org.springframework.stereotype.Repository;
import javax.persistence.NoResultException;
@Repository
public class BuyerRepo extends AbstractRepository {
public Buyer getBuyer(String buyerName) throws InvalidIdException {
javax.persistence.Query buyerId = entityManager.createNativeQuery("select b.buyer_id from buyer b where b.name = :name").setParameter("name", buyerName);
Integer id;
try {
id = (Integer) buyerId.getSingleResult();
} catch (NoResultException e) {
return null;
}
return getBuyer(id);
}
public Buyer getBuyer(long buyerId) throws InvalidIdException {
Buyer buyer = entityManager.find(Buyer.class, buyerId); **====> NULL**
if (buyer == null) throw new InvalidIdException("Invalid Article ID");
return buyer;
}
}
this is my controller which is calling the repository method
package com.ajit.retail.web;
import com.sun.jersey.spi.inject.Inject;
import com.ajit.retail.exception.InvalidIdException;
import com.ajit.retail.model.Buyer;
import com.ajit.retail.repository.*;
import org.springframework.stereotype.Component;
import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.core.MediaType;
@Path("/buyer")
@Component
public class BuyerController {
@Inject
private BuyerRepo buyerRepo;
@GET
@Produces(MediaType.APPLICATION_JSON)
public Buyer searchFields() throws InvalidIdException {
String buyerId = "51";
Buyer buyer;
try {
buyer = buyerRepo.getBuyer(Long.parseLong(buyerId));
} catch (NumberFormatException e) {
buyer = buyerRepo.getBuyer(buyerId);
}
return buyer;
}
}
these are the unit tests which are passing
package com.ajit.retail.repository;
import com.ajit.retail.exception.InvalidIdException;
import org.hamcrest.core.IsEqual;
import org.junit.Before;
import org.junit.Test;
import org.springframework.beans.factory.annotation.Autowired;
import static org.junit.Assert.assertThat;
public class BuyerRepoTest extends BaseRepository {
@Autowired
private BuyerRepo buyerRepo;
@Test
public void shouldGiveNameOfGivenBuyerId() throws InvalidIdException {
assertThat(buyerRepo.getBuyer(2).getName(), IsEqual.equalTo("SupervisorDLS"));
}
@Test(expected = InvalidIdException.class)
public void shouldThrowExceptionForInvalidBuyerId() throws InvalidIdException {
buyerRepo.getBuyer(-10);
}
}
this is the base repository
package com.ajit.retail.repository;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.AbstractTransactionalJUnit4SpringContextTests;
@ContextConfiguration(locations = {"classpath:applicationContext.xml"})
public class BaseRepository extends AbstractTransactionalJUnit4SpringContextTests {
}
this is the applicationContext.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:tx="http://www.springframework.org/schema/tx" xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-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-2.5.xsd">
<context:annotation-config/>
<context:component-scan base-package="com.ajit.retail"/>
<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="org.postgresql.Driver"/>
<property name="url" value="jdbc:postgresql://localhost/retail"/>
<property name="username" value="retail_user"/>
<property name="password" value="password"/>
</bean>
<bean id="entityManager" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
<property name="dataSource" ref="dataSource"/>
<property name="packagesToScan" value="com.ajit.retail"/>
<property name="jpaVendorAdapter">
<bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
<property name="showSql" value="true"/>
<property name="databasePlatform" value="org.hibernate.dialect.PostgreSQLDialect"/>
</bean>
</property>
</bean>
<bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
<property name="entityManagerFactory" ref="entityManager"/>
</bean>
<tx:annotation-driven transaction-manager="transactionManager"/>
</beans>
Please Help!
解决方案 I solved this problem by replacing
<servlet>
<servlet-name>retail</servlet-name>
**<servlet-class>com.sun.jersey.spi.container.servlet.ServletContainer</servlet-class>**
<init-param>
<param-name>com.sun.jersey.config.property.packages</param-name>
<param-value>com.ajit.retail.web</param-value>
</init-param>
<init-param>
<param-name>com.sun.jersey.api.json.POJOMappingFeature</param-name>
<param-value>true</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
with
<servlet>
<servlet-name>retail</servlet-name>
**<servlet-class>com.sun.jersey.spi.spring.container.servlet.SpringServlet</servlet-class>**
<init-param>
<param-name>com.sun.jersey.config.property.packages</param-name>
<param-value>com.ajit.retail.web</param-value>
</init-param>
<init-param>
<param-name>com.sun.jersey.api.json.POJOMappingFeature</param-name>
<param-value>true</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
这篇关于当我正在运行测试用例时，实体管理器被成功注入，但在运行web应用程序时抛出NullPointerException的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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