Question

对于数据源层，我使用以下Spring配置文件：

@Configuration
@ComponentScan(basePackages = {"com.savdev.springmvcexample.repository", "com.savdev.springmvcexample.config"})
@EnableTransactionManagement
@EnableJpaRepositories(basePackages = {"com.savdev.springmvcexample.repository"})
public class InfrastructureContextConfiguration {
...
    @Configuration
    @Profile(value = "file_based")
    @PropertySource("classpath:/db/config/file_based.properties")
    public static class FileBasedConfiguration {

        @Inject
        private Environment environment;

        @Bean
        public DataSource dataSource() {
            BasicDataSource dataSource = new org.apache.commons.dbcp.BasicDataSource();
            dataSource.setDriverClassName(environment.getProperty("jdbc.driver"));
            dataSource.setUrl(environment.getProperty("jdbc.url"));
            dataSource.setUsername(environment.getProperty("jdbc.username"));
            dataSource.setPassword(environment.getProperty("jdbc.password"));
            return dataSource;
        }
    }
...

要运行测试，我通过@ContextConfiguration加载此配置：

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(classes = { InfrastructureContextConfiguration.class, HsqldbEmbeddableDbStarterContextConfiguration.class })
@TransactionConfiguration(transactionManager = "transactionManager", defaultRollback = false)
@Transactional()
@ActiveProfiles(profiles = {"file_based", "test_data"} )
public abstract class AbstractJpaJavaTestBase {
...

它运作正常。

创建DispatcherServlet时，Web模块中使用相同的InfrastructureContextConfiguration类：

public class SpringMvcExampleWebApplicationInitializer implements WebApplicationInitializer {

    @Override
    public void onStartup(ServletContext servletContext) throws ServletException {
        registerDispatcherServlet(servletContext);
    }

    private void registerDispatcherServlet(final ServletContext servletContext) {
        WebApplicationContext dispatcherContext = createContext(WebMvcContextConfiguration.class, InfrastructureContextConfiguration.class);
        DispatcherServlet dispatcherServlet = new DispatcherServlet(dispatcherContext);
        dispatcherServlet.setContextInitializers( new SpringMvcExampleProfilesInitializer());
        ServletRegistration.Dynamic dispatcher;
        dispatcher = servletContext.addServlet("dispatcher", dispatcherServlet);
        dispatcher.setLoadOnStartup(1);
        dispatcher.addMapping("/");
    }

    private WebApplicationContext createContext(final Class<?>... annotatedClasses) {
        AnnotationConfigWebApplicationContext context = new AnnotationConfigWebApplicationContext();
        context.register(annotatedClasses);
        return context;
    }
}

但是现在，我在InfrastructureContextConfiguration的以下行中得到NullPointerException：

dataSource.setDriverClassName(environment.getProperty("jdbc.driver"));

environment未连线。我该怎么做才能解决它？

Answer 1

我找到了什么。类似的问题已经得到满足： same1, some solutions

seems the problem is not connected, but the last answer is the best solution

总：实际上，使用@Inject注入的字段不能为空。它必须抛出异常。因此，如果它为null，那么 - 根本没有应用注释。因此，主要原因是它没有在类路径中实现。

所以我在web.pom中添加了以下内容。它解决了这个问题：

<dependency>
    <groupId>javax.inject</groupId>
    <artifactId>javax.inject</artifactId>
    <version>1</version>
</dependency>

作为我可以使用的替代选项：

@Resource而不是@Inject，并且已经设置了环境。
将envirionment作为参数传递给构造函数，而不是通过注释进行连接。但最好的情况，恕我直言，是修复jar依赖。

在不同的上下文中的春豆布线

1 个答案: