[英]Getting Spring 4 dependency injection working with RESTeasy 3 validator
[英]JBoss, RestEasy, Spring dependency injection failing
我将要放弃JBoss,然后回到Tomcat,但是我认为在跳船之前我会问一下stackoverflow的明智之举。 抱歉,这里会粘贴很多代码/ xml /日志。 我一定缺少一些简单的东西?
我已经在JBoss 7.1.1上启动了一个新的Resteasy项目,目前有2个端点,如下所示。
@Named
@Path("/v1/users")
@Produces(MediaType.APPLICATION_JSON)
public class UserResource {
@Inject
private UserService userService;
@GET
public Response getUsers() {
User user = new User();
user.setUsername("someUsername");
user.setEmail("user@gmail.com");
user.setPassword("thepassword");
Response.ResponseBuilder responseBuilder = Response.ok(user);
return responseBuilder.build();
}
@POST
@Consumes(MediaType.APPLICATION_JSON)
public Response createUser(User user) {
Response.ResponseBuilder responseBuilder = null;
try {
userService.register(user);
responseBuilder = Response.created(null);
} catch (UserException ue) {
if (ue.getMessage().equals(ErrorCode.USER_REGISTRATION_FIELD_MISSING)) {
responseBuilder = Response.status(Response.Status.fromStatusCode(422));
responseBuilder.entity(ue.getMessage());
} else {
responseBuilder = Response.serverError();
responseBuilder.entity(ue.getMessage());
}
}
return responseBuilder.build();
}
}
@Get / v1 / users可以正常工作。 我的问题是,未注入userService,并且在userService.register(user)调用中调用@POST / v1 / users时出现NullPointerExceptions。 下面的堆栈跟踪
17:17:05,669 ERROR [org.apache.catalina.core.ContainerBase.[jboss.web].[default-host].[/api].[Resteasy]] (http--127.0.0.1-8080-1) Servlet.service() for servlet Resteasy threw exception: org.jboss.resteasy.spi.UnhandledException: java.lang.NullPointerException
at org.jboss.resteasy.core.SynchronousDispatcher.handleApplicationException(SynchronousDispatcher.java:340) [resteasy-jaxrs-2.3.2.Final.jar:]
... JBoss/Resteasy attempting to handle exception, left out to reduce bloat
Caused by: java.lang.NullPointerException
at au.com.codecave.api.UserResource.createUser(UserResource.java:48) [classes:]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) [rt.jar:1.7.0_25]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) [rt.jar:1.7.0_25]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) [rt.jar:1.7.0_25]
at java.lang.reflect.Method.invoke(Method.java:606) [rt.jar:1.7.0_25]
at org.jboss.resteasy.core.MethodInjectorImpl.invoke(MethodInjectorImpl.java:155) [resteasy-jaxrs-2.3.2.Final.jar:]
at org.jboss.resteasy.core.ResourceMethod.invokeOnTarget(ResourceMethod.java:257) [resteasy-jaxrs-2.3.2.Final.jar:]
at org.jboss.resteasy.core.ResourceMethod.invoke(ResourceMethod.java:222) [resteasy-jaxrs-2.3.2.Final.jar:]
at org.jboss.resteasy.core.ResourceMethod.invoke(ResourceMethod.java:211) [resteasy-jaxrs-2.3.2.Final.jar:]
at org.jboss.resteasy.core.SynchronousDispatcher.getResponse(SynchronousDispatcher.java:525) [resteasy-jaxrs-2.3.2.Final.jar:]
... 19 more
我按照此JBoss文档设置了我的web.xml,并像往常一样设置了context.xml文件。
在web.xml
<!DOCTYPE web-app PUBLIC
"-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
"http://java.sun.com/dtd/web-app_2_3.dtd" >
<web-app>
<!-- Auto scan for REST services ad providers -->
<context-param>
<param-name>resteasy.scan</param-name>
<param-value>true</param-value>
</context-param>
<context-param>
<param-name>resteasy.scan.providers</param-name>
<param-value>true</param-value>
</context-param>
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/bizniz-context.xml</param-value>
</context-param>
<listener>
<listener-class>org.jboss.resteasy.plugins.server.servlet.ResteasyBootstrap</listener-class>
</listener>
<listener>
<listener-class>org.jboss.resteasy.plugins.spring.SpringContextLoaderListener</listener-class>
</listener>
<servlet>
<servlet-name>Resteasy</servlet-name>
<servlet-class>
org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher
</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>Resteasy</servlet-name>
<url-pattern>/*</url-pattern>
</servlet-mapping>
</web-app>
bizniz-的context.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd">
<import resource="persistence-context.xml" />
<context:component-scan base-package="au.com.codecave.service"/>
</beans>
UserServiceImpl.java
@Named
public class UserServiceImpl implements UserService {
private static final Logger log = LoggerFactory.getLogger(UserServiceImpl.class);
@Inject
private UserDao userDao;
@Override
public User register(User user) throws UserException {
if (StringUtils.isEmpty(user.getEmail()) || StringUtils.isEmpty(user.getEmail())) {
log.error("Mandatory registration field was empty. Email: {}, Username: {}", user.getEmail(), user.getUsername());
throw new UserException(ErrorCode.USER_REGISTRATION_FIELD_MISSING.getMessage());
}
try {
userDao.create(user);
} catch (DataException de) {
throw new UserException(de);
}
return user;
}
我没有在启动日志中看到任何有关实例化任何bean的异常,所以我不认为这是问题所在,我看到以下消息,我认为这意味着Spring正确初始化了
17:16:46,003 INFO [org.springframework.beans.factory.support.DefaultListableBeanFactory] (MSC service thread 1-4) Pre-instantiating singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@54287575: defining beans [userDaoImpl,org.springframework.context.annotation.internalConfigurationAnnotationProcessor,org.springframework.context.annotation.internalAutowiredAnnotationProcessor,org.springframework.context.annotation.internalRequiredAnnotationProcessor,org.springframework.context.annotation.internalCommonAnnotationProcessor,dataSource,jdbcTemplate,userServiceImpl,org.springframework.context.annotation.ConfigurationClassPostProcessor.importAwareProcessor]; root of factory hierarchy
17:16:46,121 INFO [org.springframework.web.context.ContextLoader] (MSC service thread 1-4) Root WebApplicationContext: initialization completed in 783 ms
我整天都在网上搜索以寻找解决方案,但似乎找不到。 下面的版本详细信息。
JBoss AS 7.1.1 Spring 3.2.8.RELEASE(以前是4,但意识到resteasy Bootstrap仅可用于3, 请参见此处的问题 )Resteasy-spring 3.0.8.Final
如果需要更多信息,请告诉我。 谢谢大家
我有同样的空指针异常问题。
步骤1:代替使用SpringContextLoaderListener,请尝试从spring.web.xml中的默认ContextLoaderListener
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
步骤2:在POM文件中添加以下2个依赖项:
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>4.2.0.RELEASE</version>
</dependency>
<dependency>
<groupId>org.jboss.resteasy</groupId>
<artifactId>resteasy-spring</artifactId>
<version>3.0.4.Final</version>
</dependency>
步骤3:在bizniz-context.xml中,在component-scan上方添加以下bean定义
<bean class="org.jboss.resteasy.plugins.spring.SpringBeanProcessorServletAware"/>
希望这可以帮助。
不确定是否是问题所在,但是在JEE环境中初始化JAX-RS几乎不需要手动配置。 无需在web.xml中配置servlet(这是为了使其在非JEE环境(例如Tomcat)上工作),您只需要像下面这样的Application类:
@ApplicationPath("/REST")
public class JaxrsApplication extends Application {
}
此类的存在(使用ApplicationPath和扩展Application进行注释)将触发JBoss初始化JAX-RS子系统。 根据需要命名,然后将其映射到所需的任何URL。
文档:
https://docs.jboss.org/author/display/AS7/JAX-RS+Reference+Guide
但是我看到您使用Spring,这使我怀疑我在说的是全部事实。
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