我想在 FcSolrServiceImpl 类中@autowire SolrCrudRepository,但它在 NPE 中给出。以下是我的实现。
FcSolrServiceImpl.java
public class FcSolrServiceImpl<K> {
@Autowired(required = true)
SolrCrudRepository<K, String> repository;
public void saveProduct(K input) {
repository.save(input); // Getting null pointer in repository
}
}
产品.java
@SolrDocument(solrCoreName = "core1")
public class Product {
Product() {
};
@Field
@Id
private String id;
// getter setter hashcode equals toString methods
}
FcIndexSyncApplication.java
@Configuration
@EnableAutoConfiguration
@ComponentScan
public class FcIndexSyncApplication extends SpringBootServletInitializer {
public static void main(String[] args) {
SpringApplication.run(FcIndexSyncApplication.class, args);
FcSolrServiceImpl<Product> fpsi = new FcSolrServiceImpl<Product>();
Product input = new Product();
input.setID("abc");
fpsi.saveProduct(input);
}
@Override
protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
return application.sources(FcIndexSyncApplication.class);
}
@Bean
public SolrTemplate solrTemplate() throws Exception {
HttpSolrServer httpSolrServer = new HttpSolrServer("${spring.data.solr.host}");
return new SolrTemplate(httpSolrServer, "core1");
}
}
最佳答案
您正在创建FcSolrServiceImpl
与 new
。 FcSolrServiceImpl<Product> fpsi = new FcSolrServiceImpl<Product>();
这样 Spring 就不知道该对象的任何信息。您必须从 Spring 上下文获取 bean,才能使用依赖注入(inject):
ApplicationContext ctx = SpringApplication.run(FcIndexSyncApplication.class, args);
FcSolrServiceImpl myBean = ctx.getBean(FcSolrServiceImpl.class);
myBean....
关于java - 如何 Autowiring 泛型类型,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/35409871/