我正在使用JAX-RS制作休息服务应用程序。它用于学校的一些项目。对于这个项目,我需要使用以下技术: •Maven •JAX-RS •CDI •JPA - EJB •JNDI •Bean验证
所以现在我已经使用假冒DB(“CafeStub”)和使用JPA(“CafeDB”)的真实数据库将我的域“Cafes”归档。我的域名也使用了一些CDI。 (@Service在CafeService类中...)
我的问题是,当我再次尝试使用CDI时,它会失败,并且它会产生500异常,NullPointerException,“严重:RuntimeException无法映射到响应,重新投掷到HTTP容器” 完整Stacktrace:
我不知道如何解决这个问题,已经搜索了很长时间..希望有人可以帮助我:s
这是我的“CafeController”课程。制作休息服务
Path("/cafes")
public class CafeController {
@Inject
private CafeFacade cafeFacade;
public CafeController() {
//this.cafeFacade = new CafeService();
}
@GET
@Produces("application/json")
public Response getCafes(){
try{
// test ........
ObjectMapper mapper = new ObjectMapper();
Cafe cafe = cafeFacade.getCafe(new Long(1));
String jsonInString = mapper.writeValueAsString(cafe);
return Response.status(200).entity(jsonInString).build();
}catch (JsonProcessingException jsonEx) {
System.out.println("Json Exception");
System.out.println(jsonEx.getMessage());
return null;
}
}
这是“CafeService”课程,实施“CafeFacade”
public class CafeService implements CafeFacade {
@Inject
private CafeRepository cafeRepository;
public CafeService() {
//cafeRepository = new CafeStub();
//cafeRepository = new CafeDB("CafesPU");
}
@Override
public long addCafe(Cafe cafe) {
return this.cafeRepository.addCafe(cafe);
}
@Override
public Cafe getCafe(long cafeID) {
return this.cafeRepository.getCafe(cafeID);
}
她看到了“CafeStub”类,实现了“CafeRepository”
的类public class CafeStub implements CafeRepository {
private static Map<Long, Cafe> cafes;
private static long counter = 0;
public CafeStub() {
cafes = new HashMap<Long, Cafe>();
// adding some dara
this.addSomeData();
}
@Override
public long addCafe(Cafe cafe) {
if(cafe == null){
throw new DBException("No cafe given");
}
counter++;
cafe.setCafeID(counter);
cafes.put(cafe.getCafeID(), cafe);
return cafe.getCafeID();
}
@Override
public Cafe getCafe(long cafeID) {
if(cafeID < 0){
throw new DBException("No correct cafeID given");
}
if(!cafes.containsKey(cafeID)){
throw new DBException("No cafe was found");
}
return cafes.get(cafeID);
}
至少在这里你可以看到我的pom.xml(来自CafeService项目的依赖项) - web.xml(来自CafeService项目)和项目结构......
<dependencies>
<dependency>
<groupId>Cafes</groupId>
<artifactId>Cafes</artifactId>
<version>0.0.1</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.8.3</version>
<type>jar</type>
</dependency>
<dependency>
<groupId>javax</groupId>
<artifactId>javaee-web-api</artifactId>
<version>7.0</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>asm</groupId>
<artifactId>asm</artifactId>
<version>3.3.1</version>
</dependency>
<dependency>
<groupId>com.sun.jersey</groupId>
<artifactId>jersey-bundle</artifactId>
<version>1.19.4</version>
</dependency>
<dependency>
<groupId>com.sun.jersey</groupId>
<artifactId>jersey-server</artifactId>
<version>1.19.4</version>
</dependency>
<dependency>
<groupId>com.sun.jersey</groupId>
<artifactId>jersey-core</artifactId>
<version>1.19.4</version>
</dependency>
</dependencies>
提前致谢... 干杯 汤姆
答案 0 :(得分:1)
仅使用@Path注释的类不会将该类标记为CDI bean,因为它不在CDI规范中定义注释的bean列表中。将RequestScoped添加到REST服务将其标记为CDI bean,因此注入工作正如您所发现的那样。
这里的答案列出了将类标记为CDI bean的注释。 Is @javax.annotation.ManagedBean a CDI bean defining annotation?
答案 1 :(得分:0)
解决了..RequestScoped做了伎俩.. Daimn搜索了很长时间的一个注释。
{
typ: "JWT",
alg: "RS256",
kid: "VWVIc1WD1Tksbb301sasM5kOq5Q"
}.
{
aud: "36d2abdd-2363-4ff9-b597-77d41e0e3b81",
iss: "https://login.microsoftonline.com/GUID/v2.0",
iat: 1502173871,
nbf: 1502173871,
exp: 1502177771,
aio: "ATQAy/8EAAAA2JCq8vpq6La3M0KIKWw1vgJOfhDQyurYRhbCR47qSjByGzPkyZX0zi5y9uYCQS+q",
c_hash: "3JkkVwHgmYiHvR-gVdb22w",
name: "First name Last name",
nonce: "636377709651517241.MDNkOWNhYzMtYjk4NC00OTBkLWI2Y2EtYzU5NmM0NWZjOGExNWQxZmU3MTgtN2RhYS00NjVlLTkwZDgtZjIwOGY4NTcyNTZi",
oid: "4f64d4db-8115-4f19-8554-bedf20688226",
preferred_username: "firstname.lastname@company.com",
sub: "MRN4y1TZ-qG1uxrL7ozf8KbBm0VbcbH7djaKK187qH8",
tid: "34e9a1f3-23e1-4ead-b2fd-41660c25cc47",
ver: "2.0"
}.
我仍然不明白为什么需要使用它。 @RequestScoped:CDI实例化和管理bean - &GT;我以为我的bean.xml会实例化并管理bean吗?