标签:datasource annotations java spring-mvc
尝试设置我正在使用Spring 3.0的dataSource时出现以下错误是我的代码:
错误
520 [ContainerBackgroundProcessor[StandardEngine[Catalina]]] ERROR org.springframework.web.context.ContextLoader - Context initialization failed
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'countryManager' defined in ServletContext resource [/WEB-INF/applicationContext.xml]: Cannot resolve reference to bean 'countryDao' while setting bean property 'countryDao'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'countryDao' defined in ServletContext resource [/WEB-INF/applicationContext.xml]: Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationException: Could not instantiate bean class [com.crimetrack.jdbc.JdbcCountryDAO]: No default constructor found; nested exception is java.lang.NoSuchMethodException: com.crimetrack.jdbc.JdbcCountryDAO.<init>()
JdbcCountryDAO.java
@Repository
public class JdbcCountryDAO extends JdbcDaoSupport implements CountryDAO{
private final Logger logger = Logger.getLogger(getClass());
@Autowired
JdbcCountryDAO(DataSource dataSource){
setDataSource(dataSource);
}
public List<Country> getCountryList() {
int countryId = 6;
String countryCode = "AI";
logger.debug("In getCountryList()");
String sql = "SELECT * FROM TBLCOUNTRY WHERE countryId = ? AND countryCode = ?";
logger.debug("Executing getCountryList String "+sql);
Object[] parameters = new Object[] {countryId, countryCode};
logger.info(sql);
//List<Country> countryList = getJdbcTemplate().query(sql,new CountryMapper());
List<Country> countryList = getJdbcTemplate().query(sql, parameters,new CountryMapper());
return countryList;
}
applicationContext.xml
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
<property name="driverClassName" value="${jdbc.driverClassName}"/>
<property name="url" value="${jdbc.url}"/>
<property name="username" value="${jdbc.username}"/>
<property name="password" value="${jdbc.password}"/>
</bean>
<bean id="countryManager" class="com.crimetrack.service.CountryManager">
<property name="countryDao" ref="countryDao"/>
</bean>
<bean id="countryDao" class="com.crimetrack.jdbc.JdbcCountryDAO">
<property name="dataSource" ref="dataSource"/>
</bean>
解决方法:
您需要这样做:
<bean id="countryDao" class="com.crimetrack.jdbc.JdbcCountryDAO">
<constructor-arg index="0" ref="dataSource"/>
</bean>
dataSource不是JdbcCountryDAO类的属性,它是一个构造函数参数. Spring对您说:未找到默认构造函数,因为这不是默认构造函数:
@Autowired
JdbcCountryDAO(DataSource dataSource){
setDataSource(dataSource);
}
它有一个数据源作为参数.
标签:datasource,annotations,java,spring-mvc 来源: https://codeday.me/bug/20191031/1978697.html
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