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Developing rest web service with jersey, maven and spring. New to spring and maven. facing SEVERE: Servlet.service() for servlet [abc] in context with path [/xyz] threw exception [java.lang.NullPointerException] issue. when i invoke rest web service My response object is null. Below is my 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>

Below is my web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
  <display-name>xyz</display-name>
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.htm</welcome-file>
    <welcome-file>default.jsp</welcome-file>
  </welcome-file-list>
  <!-- <servlet>
        <servlet-name>context</servlet-name>
        <servlet-class>org.springframework.web.context.ContextLoaderServlet</servlet-class>
        <load-on-startup>1000</load-on-startup>
    </servlet> -->
  <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath*:application-context.xml</param-value>
    </context-param>
    <listener>
    <listener-class>
          org.springframework.web.context.ContextLoaderListener
    </listener-class>
  </listener>
  <servlet>
        <servlet-name>abc</servlet-name>
         <servlet-class>org.glassfish.jersey.servlet.ServletContainer</servlet-class>
        <init-param>
            <param-name>jersey.config.server.provider.packages</param-name>
            <param-value>com.ecable.endpoint</param-value>
        </init-param>

        <load-on-startup>1001</load-on-startup>
    </servlet>

    <servlet-mapping>
        <servlet-name>abc</servlet-name>
        <url-pattern>/rest/*</url-pattern>
    </servlet-mapping>
</web-app>

And my responseObject is below with getters and setters 

@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "myresponse", propOrder = {
    "cityId",
    "cityDesc"
})
@Component
public class Myresponse {

And my endpoint is below

@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();

    }

Any help is appreciated.

Please see the logs

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)

Also please see 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>
RK3
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  • Most probably `Myresponse` is not injected. As to why this happens, maybe seeing the complete stacktrace could help tracking down what the problem is. – francesco foresti Jul 03 '15 at 07:24
  • i have updated with the logs – RK3 Jul 03 '15 at 07:34
  • The second line of the stacktrace is the culprit : `WARNING: No beans found. Resolution failed for type class com.objects.MyResponse.` Spring tried to resolve the bean, but it couldn't. Maybe you just have to configure your application so that the bean can be resolved. – francesco foresti Jul 03 '15 at 07:36
  • i have updated rest-config.xml above. what is wrong with it? how to configure it? – RK3 Jul 03 '15 at 07:47
  • maybe the empty `` interferes with spring's deafult configuration. Try removing it (I'm sorry I can't point you straight to the problem, but since it is 99% a configuration issue, it is quite difficult to understand what's interfering) – francesco foresti Jul 03 '15 at 07:56
  • Yes i removed it and checked. still the same issue – RK3 Jul 03 '15 at 08:21

1 Answers1

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Looking at the Javadoc for AutowiredAnnotationBeanPostProcessor it seems to me that there is nothing obviously wrong with your code. In order to try narrowing things down, try to put an explicit Autowired annotation on the default constructor of Myresponse and see what happens :

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

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

// ...
}

Another possible issue could be this excerpt from the javadoc linked above :

Note: A default AutowiredAnnotationBeanPostProcessor will be registered by the "context:annotation-config" and "context:component-scan" XML tags. Remove or turn off the default annotation configuration there if you intend to specify a custom AutowiredAnnotationBeanPostProcessor bean definition

EDIT : it seems you're experiencing the same problem as described in this question. The answer says that you have to provide the configuration for Spring via the applicationContext.xml, not web.xml. THat file also has to be put in the WEB-INF folder.

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francesco foresti
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