Question

好吧，我在配置Spring的JDBCTemplate以正常工作时遇到了问题。我试图注入数据源，但它似乎总是为空。以下是示例代码：

的applicationContext.xml：

<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="org.apache.derby.jdbc.EmbeddedDriver" />
<property name="url"
    value="jdbc:derby:c:\\Derby\\MyDB\\jsfkickstart;create=true" />
<property name="username" value="admin" />
<property name="password" value="admin" />
</bean>

<bean id="employeeDoa" class="com.kickstart.employeeapp.doa.EmployeeDoa">
    <property name="dataSource" ref="dataSource" />
</bean>

的web.xml

<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/applicationContext.xml</param-value>

<listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<listener>
        <listener-class>org.springframework.web.context.request.RequestContextListener</listener-class>
</listener>

EmployeeDoa.java

public class EmployeeDoa implements IEmployeeDoa, IDepartmentDoa {
private DataSource dataSource;
        public List<Employee> getAllEmployees() {
        JdbcTemplate select = new JdbcTemplate(dataSource);
        return select.query(
                "SELECT "+
                    "e.ID as empId, "+
                    "e.FIRSTNAME as empFirstName, "+ 
                    "e.LASTNAME as empLastName,  "+
                    "d.ID as depId,  "+
                    "d.NAME as depName, "+
                    "d.LOCATION as depLocation "+
                "FROM jsfkickstart.Employee e, jsfkickstart.Department d",
                new EmployeeMapper());
        }
}

class EmployeeMapper implements RowMapper {
    public Object mapRow(ResultSet rs, int rowNum) throws SQLException {
        Employee emp = new Employee();
        emp.setId(rs.getInt("empId"));
        emp.setFirstName(rs.getString("empFirstName"));
        emp.setLastName(rs.getString("empLastName"));
        Department dep = new Department();
        dep.setId(rs.getShort("depId"));
        dep.setLocation(rs.getString("depLocation"));
        dep.setName(rs.getString("depName"));
        emp.setDepartment(dep);
        return emp;
    }
}

异常抛出：

Exception in thread "main" java.lang.IllegalArgumentException: Property 'dataSource' is required
at org.springframework.jdbc.support.JdbcAccessor.afterPropertiesSet(JdbcAccessor.java:134)
at org.springframework.jdbc.core.JdbcTemplate.<init>(JdbcTemplate.java:142)
at com.kickstart.employeeapp.doa.EmployeeDoa.addEmployee(EmployeeDoa.java:29)

有谁知道如何解决这个问题？如果我遗漏了问题中的任何重要信息，请告诉我。

谢谢。

Answer 1

我实际上是一个非常愚蠢的例外。 setDataSource（）的主体是空的，即我没有将dataSource分配给任何东西，因此它总是为空。

愚蠢的我!!!

Spring的JDBCTemplate IllegalArgumentException：需要数据源

1 个答案: