严重：路径为[/xyz]的上下文中Servlet[abc]的Servlet.service（）引发异常[java.lang.NullPointerException]_Java_Spring_Rest_Maven_Jersey

严重：路径为[/xyz]的上下文中Servlet[abc]的Servlet.service（）引发异常[java.lang.NullPointerException]

java spring rest maven jersey

严重：路径为[/xyz]的上下文中Servlet[abc]的Servlet.service（）引发异常[java.lang.NullPointerException],java,spring,rest,maven,jersey,Java,Spring,Rest,Maven,Jersey,使用jersey、maven和spring开发RESTWeb服务。spring和maven的新手。面临严重问题：路径为[/xyz]的上下文中Servlet[abc]的Servlet.service引发异常[java.lang.NullPointerException]问题。当我调用RESTWeb服务时，我的响应对象为null。下面是我的pom.xml <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://

使用jersey、maven和spring开发RESTWeb服务。spring和maven的新手。面临严重问题：路径为[/xyz]的上下文中Servlet[abc]的Servlet.service引发异常[java.lang.NullPointerException]问题。当我调用RESTWeb服务时，我的响应对象为null。下面是我的pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>com.ecable</groupId>
  <artifactId>ecableWS</artifactId>
  <version>0.0.1-SNAPSHOT</version>

<properties>
        <jersey.version>2.2</jersey.version>
        <javax.servlet.version>2.3</javax.servlet.version>
        <spring.batch.version>2.2.0.RELEASE</spring.batch.version>
        <spring.version>3.1.1.RELEASE</spring.version>
        <slf4j.version>1.7.7</slf4j.version>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    </properties>
        <dependencies>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-context-support</artifactId>
                <version>${spring.version}</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-webmvc</artifactId>
                <version>${spring.version}</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-web</artifactId>
                <version>${spring.version}</version>
            </dependency>
            <dependency>
                <groupId>org.slf4j</groupId>
                <artifactId>slf4j-api</artifactId>
                <version>${slf4j.version}</version>
            </dependency>
            <dependency>
                <groupId>org.glassfish.jersey.core</groupId>
                <artifactId>jersey-server</artifactId>
                <version>${jersey.version}</version>
            </dependency>
            <dependency>
                <groupId>org.slf4j</groupId>
                <artifactId>slf4j-log4j12</artifactId>
                <version>${slf4j.version}</version>
            </dependency>
            <dependency>
                <groupId>commons-logging</groupId>
                <artifactId>commons-logging</artifactId>
                <version>1.1.1</version>
            </dependency>
            <dependency>
                <groupId>com</groupId>
                <artifactId>ojdbc</artifactId>
                <version>6</version>
            </dependency>
            <dependency>
                <groupId>com.jcraft</groupId>
                <artifactId>jsch</artifactId>
                <version>0.1.51</version>
            </dependency>
            <dependency>
                <groupId>javax.ws.rs</groupId>
                <artifactId>javax.ws.rs-api</artifactId>
                <version>2.0</version>
            </dependency>
            <dependency>
                <groupId>com.googlecode.json-simple</groupId>
                <artifactId>json-simple</artifactId>
                <version>1.1</version>
            </dependency>
            <dependency>
                <groupId>commons-lang</groupId>
                <artifactId>commons-lang</artifactId>
                <version>2.3</version>
            </dependency>
            <dependency>
                <groupId>junit</groupId>
                <artifactId>junit</artifactId>
                <version>4.8.1</version>
                <scope>test</scope>
            </dependency>
            <dependency>
                <groupId>javax.servlet</groupId>
                <artifactId>servlet-api</artifactId>
                <version>${javax.servlet.version}</version>
                <scope>provided</scope>
            </dependency>
            <dependency>
                <groupId>org.glassfish.jersey.containers</groupId>
                <artifactId>jersey-container-servlet</artifactId>
                <version>${jersey.version}</version>
            </dependency>
            <dependency>
                <groupId>org.glassfish.jersey.media</groupId>
                <artifactId>jersey-media-moxy</artifactId>
                <version>${jersey.version}</version>
            </dependency>
            <dependency>
                <groupId>org.glassfish.jersey.test-framework.providers</groupId>
                <artifactId>jersey-test-framework-provider-simple</artifactId>
                <version>${jersey.version}</version>
                <scope>test</scope>
            </dependency>
            <dependency>
                <groupId>org.glassfish.jersey.ext</groupId>
                <artifactId>jersey-spring3</artifactId>
                <version>${jersey.version}</version>
            </dependency>
            <dependency>
                <groupId>org.glassfish.jersey.ext</groupId>
                <artifactId>jersey-declarative-linking</artifactId>
                <version>2.19</version>
            </dependency> 
            <dependency>
                <groupId>org.glassfish.jersey.ext</groupId>
                <artifactId>jersey-bean-validation</artifactId>
                <version>${jersey.version}</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-jdbc</artifactId>
                <version>${spring.version}</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-beans</artifactId>
                <version>${spring.version}</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-aop</artifactId>
                <version>${spring.version}</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-context</artifactId>
                <version>${spring.version}</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-core</artifactId>
                <version>${spring.version}</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-expression</artifactId>
                <version>${spring.version}</version>
            </dependency>
            <dependency>
                <groupId>org.apache.poi</groupId>
                <artifactId>poi</artifactId>
                <version>3.8</version>
            </dependency>
            <dependency>
                <groupId>org.apache.commons</groupId>
                <artifactId>commons-io</artifactId>
                <version>1.3.2</version>
            </dependency>
            <dependency>
                <groupId>org.springframework.batch</groupId>
                <artifactId>spring-batch-core</artifactId>
                <version>${spring.batch.version}</version>
            </dependency>
            <dependency>
                <groupId>org.springframework.batch</groupId>
                <artifactId>spring-batch-infrastructure</artifactId>
                <version>${spring.batch.version}</version>
            </dependency>
            <dependency>
                <groupId>net.sourceforge.jexcelapi</groupId>
                <artifactId>jxl</artifactId>
                <version>2.6.3</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-test</artifactId>
                <version>${spring.version}</version>
                <scope>test</scope>
            </dependency>
</dependencies>
  <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>2.5.1</version>
                <inherited>true</inherited>
                <configuration>
                    <source>1.7</source>
                    <target>1.7</target>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>

我的终点在下面

@Path("/fetch")
public class LoginWSEndPoint {
    @Autowired
    private Myresponse myresponse ;

    @GET
    @Path("/get")
    @Consumes({MediaType.APPLICATION_JSON,MediaType.APPLICATION_XML})
    @Produces({MediaType.APPLICATION_JSON,MediaType.APPLICATION_XML})
    public Response responseMsg(){
        myresponse.setCityDesc("desc city");
        myresponse.setCityId(" city id");
        return Response.status(200).entity(loginResponse).build();

    }

感谢您的帮助

请看日志

Jul 03, 2015 12:34:05 PM org.glassfish.jersey.server.spring.AutowiredInjectResolver getBeanFromSpringContext
WARNING: No beans found. Resolution failed for type class com.objects.MyResponse.
Jul 03, 2015 12:34:06 PM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet [abc] in context with path [/xyz] threw exception [java.lang.NullPointerException] with root cause
java.lang.NullPointerException
    at com.ecable.endpoint.LoginWSEndPoint.responseMsg(LoginWSEndPoint.java:24)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at org.glassfish.jersey.server.model.internal.ResourceMethodInvocationHandlerFactory$1.invoke(ResourceMethodInvocationHandlerFactory.java:81)
    at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher$1.run(AbstractJavaResourceMethodDispatcher.java:140)
    at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.invoke(AbstractJavaResourceMethodDispatcher.java:158)
    at org.glassfish.jersey.server.model.internal.JavaResourceMethodDispatcherProvider$ResponseOutInvoker.doDispatch(JavaResourceMethodDispatcherProvider.java:152)
    at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.dispatch(AbstractJavaResourceMethodDispatcher.java:101)
    at org.glassfish.jersey.server.model.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:353)
    at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:343)
    at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:102)
    at org.glassfish.jersey.server.ServerRuntime$1.run(ServerRuntime.java:237)
    at org.glassfish.jersey.internal.Errors$1.call(Errors.java:271)
    at org.glassfish.jersey.internal.Errors$1.call(Errors.java:267)
    at org.glassfish.jersey.internal.Errors.process(Errors.java:315)
    at org.glassfish.jersey.internal.Errors.process(Errors.java:297)
    at org.glassfish.jersey.internal.Errors.process(Errors.java:267)
    at org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:318)
    at org.glassfish.jersey.server.ServerRuntime.process(ServerRuntime.java:211)
    at org.glassfish.jersey.server.ApplicationHandler.handle(ApplicationHandler.java:982)
    at org.glassfish.jersey.servlet.WebComponent.service(WebComponent.java:359)
    at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:372)
    at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:335)
    at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:218)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1040)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:607)
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:313)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)

另外，请参见my beans.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:p="http://www.springframework.org/schema/p"
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:jee="http://www.springframework.org/schema/jee"
    xsi:schemaLocation="
    http://www.springframework.org/schema/beans 
    http://www.springframework.org/schema/beans/spring-beans.xsd
    http://www.springframework.org/schema/context 
    http://www.springframework.org/schema/context/spring-context.xsd
    http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee.xsd">
    <context:component-scan base-package="com.objects" />
    <context:annotation-config />
</beans>

查看Javadoc，我觉得您的代码没有明显的错误。为了缩小范围，请尝试在Myresponse的默认构造函数上放置一个显式的自动连线注释，并查看会发生什么：

//...
public class Myresponse {
// ...

  @Autowired(required = true)
  public Myresponse() {}

// ...
}

另一个可能的问题可能是上面链接的javadoc摘录：

注意：默认的AutowiredAnnotationBeanPostProcessor将由context:annotation配置和context:component扫描XML标记注册。如果要指定自定义AutowiredAnnotationBeanPostProcessor bean定义，请删除或关闭此处的默认注释配置

编辑：您似乎遇到了与所述相同的问题。答案是，您必须通过applicationContext.xml而不是web.xml为Spring提供配置。该文件还必须放在WEB-INF文件夹中。

很可能Myresponse没有被注入。至于为什么会发生这种情况，也许看到完整的stacktrace有助于跟踪问题所在。我已经用日志更新了stacktrace的第二行是罪魁祸首：警告：没有找到bean。类型类com.objects.MyResponse的解析失败。Spring试图解决bean问题，但无法解决。也许你只需要配置你的应用程序，这样bean就可以被解析了。怎么了？如何配置？可能空的会干扰spring的deafult配置。尝试删除它。很抱歉，我不能直接向您指出问题所在，但由于它99%是配置问题，因此很难理解是什么在干扰

<?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:p="http://www.springframework.org/schema/p"
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:jee="http://www.springframework.org/schema/jee"
    xsi:schemaLocation="
    http://www.springframework.org/schema/beans 
    http://www.springframework.org/schema/beans/spring-beans.xsd
    http://www.springframework.org/schema/context 
    http://www.springframework.org/schema/context/spring-context.xsd
    http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee.xsd">
    <context:component-scan base-package="com.objects" />
    <context:annotation-config />
</beans>

//...
public class Myresponse {
// ...

  @Autowired(required = true)
  public Myresponse() {}

// ...
}