Autowired JpaRepository is always null - spring

Question

I am configuring my JPA2 + Spring project and trying to use JPARepositories but I seem to be getting Null Pointer Exception on the autowired repository object. Please look at the code and help me identify what I am missing.
Pom.xml
<dependencies>
<dependency>
<groupId>commons-logging</groupId>
<artifactId>commons-logging</artifactId>
<version>1.1.1</version>
</dependency>
<dependency>
<groupId>org.springframework.data</groupId>
<artifactId>spring-data-commons-core</artifactId>
<version>1.4.1.RELEASE</version>
</dependency>
<dependency>
<groupId>org.hibernate.java-persistence</groupId>
<artifactId>jpa-api</artifactId>
<version>2.0-cr-1</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>1.7.5</version>
</dependency>
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.14</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.springframework.data</groupId>
<artifactId>spring-data-jpa</artifactId>
<version>1.2.0.RELEASE</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>com.google.guava</groupId>
<artifactId>guava</artifactId>
<version>r09</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.11</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>3.2.4.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>3.2.4.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>3.2.4.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-aop</artifactId>
<version>3.2.4.RELEASE</version>
</dependency>
</dependencies>
Persistence.xml
<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.1"
xmlns="http://xmlns.jcp.org/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence
http://xmlns.jcp.org/xml/ns/persistence/persistence_2_1.xsd">
<persistence-unit name="Testing124"
transaction-type="RESOURCE_LOCAL">
<provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>
<class>com.myclassregister.model.base.misc.School</class>
<shared-cache-mode>ENABLE_SELECTIVE</shared-cache-mode>
<properties>
<property name="eclipselink.jdbc.batch-writing" value="Buffered" />
<property name="eclipselink.target-database" value="MySQL" />
<property name="eclipselink.jdbc.native-sql" value="false" />
<property name="eclipselink.logging.level" value="fine" />
<property name="eclipselink.logging.file"
value="C:\Users\Vineet\workspace1\MyClassRegister\persistance_logging.txt" />
<property name="eclipselink.application-location" value="C:\Users\Vineet\workspace1\MyClassRegister" />
<property name="javax.persistence.jdbc.url" value="jdbc:mysql://localhost:3306/testing124"/>
<property name="javax.persistence.jdbc.user" value="root"/>
<property name="javax.persistence.jdbc.password" value="test"/>
<property name="javax.persistence.jdbc.driver" value="com.mysql.jdbc.Driver"/>
</properties>
</persistence-unit>
applicationContext.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:jpa="http://www.springframework.org/schema/data/jpa" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:jdbc="http://www.springframework.org/schema/jdbc"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:repository="http://www.springframework.org/schema/data/repository"
xsi:schemaLocation="
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.1.xsd
http://www.springframework.org/schema/data/jpa
http://www.springframework.org/schema/data/jpa/spring-jpa-1.3.xsd
http://www.springframework.org/schema/jdbc
http://www.springframework.org/schema/jdbc/spring-jdbc-3.2.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-3.2.xsd
http://www.springframework.org/schema/data/repository
http://www.springframework.org/schema/data/repository/spring-repository-1.5.xsd">
<context:component-scan base-package="com.myclassregister.model" />
<context:annotation-config/>
<bean id="datasource"
class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="com.mysql.jdbc.Driver" />
<property name="url" value="jdbc:mysql://localhost:3306/testing124" />
<property name="username" value="root" />
<property name="password" value="test" />
</bean>
<bean id="jpaDialect"
class="org.springframework.orm.jpa.vendor.EclipseLinkJpaDialect" />
<bean id="entityManagerFactory"
class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
<property name="dataSource" ref="datasource" />
<property name="persistenceUnitName" value="MyClassRegister" />
<property name="jpaDialect" ref="jpaDialect" />
<property name="jpaVendorAdapter">
<bean
class="org.springframework.orm.jpa.vendor.EclipseLinkJpaVendorAdapter" />
</property>
<property name="loadTimeWeaver">
<bean
class="org.springframework.instrument.classloading.SimpleLoadTimeWeaver" />
</property>
</bean>
<bean id="helloWorld"
class="com.myclassregister.model.test.TestGetSchoolListActivity" />
<jpa:repositories base-package="com.myclassregister.model.repository"></jpa:repositories>
<bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
<property name="entityManagerFactory" ref="entityManagerFactory" />
</bean>
<bean id="loadTimeWeaver" class="com.myclassregister.utils.JpaAwareLoadTimeWeaver" />
<bean
class="org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor" />
</beans>
SchoolRepository.java
#Repository
public interface SchoolRepository
extends JpaRepository <School,Long> {
public School findById(Long Id);
public Collection<School> findAllSchools();
}
GetSchoolListActivity.java
#Service
public final class GetSchoolListActivity {
private static final String PERSISTENCE_UNIT_NAME = "MyClassRegister";
private static EntityManagerFactory factory;
#Autowired
SchoolRepository schoolRepository;
#Transactional(readOnly=true)
public Collection<School> GetSchools () {
factory = Persistence.createEntityManagerFactory(PERSISTENCE_UNIT_NAME);
EntityManager em = factory.createEntityManager();
JpaRepositoryFactory jpaRepositoryFactory = new JpaRepositoryFactory(em);
schoolRepository = jpaRepositoryFactory.getRepository(SchoolRepository.class);
Collection<School> schools = new ArrayList <School> ();
try{
schools = schoolRepository.findAllSchools();
}
catch(Exception e){
}
return schools;
}
}
Stack Trace
Exception in thread "main" org.springframework.data.mapping.PropertyReferenceException: No property find found for type com.myclassregister.model.base.misc.School
at org.springframework.data.mapping.PropertyPath.<init>(PropertyPath.java:75)
at org.springframework.data.mapping.PropertyPath.create(PropertyPath.java:327)
at org.springframework.data.mapping.PropertyPath.create(PropertyPath.java:353)
at org.springframework.data.mapping.PropertyPath.create(PropertyPath.java:353)
at org.springframework.data.mapping.PropertyPath.create(PropertyPath.java:307)
at org.springframework.data.mapping.PropertyPath.from(PropertyPath.java:271)
at org.springframework.data.mapping.PropertyPath.from(PropertyPath.java:245)
at org.springframework.data.repository.query.parser.Part.<init>(Part.java:73)
at org.springframework.data.repository.query.parser.PartTree$OrPart.<init>(PartTree.java:180)
at org.springframework.data.repository.query.parser.PartTree$Predicate.buildTree(PartTree.java:260)
at org.springframework.data.repository.query.parser.PartTree$Predicate.<init>(PartTree.java:240)
at org.springframework.data.repository.query.parser.PartTree.<init>(PartTree.java:68)
at org.springframework.data.jpa.repository.query.PartTreeJpaQuery.<init>(PartTreeJpaQuery.java:57)
at org.springframework.data.jpa.repository.query.JpaQueryLookupStrategy$CreateQueryLookupStrategy.resolveQuery(JpaQueryLookupStrategy.java:90)
at org.springframework.data.jpa.repository.query.JpaQueryLookupStrategy$CreateIfNotFoundQueryLookupStrategy.resolveQuery(JpaQueryLookupStrategy.java:162)
at org.springframework.data.jpa.repository.query.JpaQueryLookupStrategy$AbstractQueryLookupStrategy.resolveQuery(JpaQueryLookupStrategy.java:68)
at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.<init>(RepositoryFactorySupport.java:280)
at org.springframework.data.repository.core.support.RepositoryFactorySupport.getRepository(RepositoryFactorySupport.java:148)
at org.springframework.data.repository.core.support.RepositoryFactorySupport.getRepository(RepositoryFactorySupport.java:116)
at com.myclassregister.api.login.GetSchoolListActivity.GetSchools(GetSchoolListActivity.java:35)
at com.myclassregister.model.test.TestGetSchoolListActivity.main(TestGetSchoolListActivity.java:12)

Answer 1

I was having trouble due to the entity not having any column "ID" (its SchoolID) and the repository had a method findByID which was throwing error.

Answer 2

While creating entityManagerFactory you need to specify your domain classes.
Add the following property in your configuration :
<property name="packagesToScan" value="com.abc.model"/>
In the stacktrace that you have pasted here, it says its not able to map/recognize the School class. Once you include the above property it should work