Question

我在拨打该服务时收到错误消息。我尝试了所有可以找到的解决方案

错误全文：

SEVERE：servlet [Jersey RESTful Application]的Servlet.service（）在路径[/ sove]的上下文中引发了带有根本原因的异常[java.lang.NullPointerException] 显示java.lang.NullPointerException at com.sun.xml.internal.bind.v2.runtime.reflect.ListTransducedAccessorImpl.useNamespace（ListTransducedAccessorImpl.java:63） at com.sun.xml.internal.bind.v2.runtime.property.AttributeProperty.hasSerializeURIAction（AttributeProperty.java:96） at com.sun.xml.internal.bind.v2.runtime.ClassBeanInfoImpl.link（ClassBeanInfoImpl.java:232）在com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl。（JAXBContextImpl.java:348）在com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl。（JAXBContextImpl.java:124） at com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl $ JAXBContextBuilder.build（JAXBContextImpl.java:1123） at com.sun.xml.internal.bind.v2.ContextFactory.createContext（ContextFactory.java:147） at sun.reflect.NativeMethodAccessorImpl.invoke0（Native Method） at sun.reflect.NativeMethodAccessorImpl.invoke（NativeMethodAccessorImpl.java:62） at sun.reflect.DelegatingMethodAccessorImpl.invoke（DelegatingMethodAccessorImpl.java:43） at java.lang.reflect.Method.invoke（Method.java:498）在javax.xml.bind.ContextFinder.newInstance（ContextFinder.java:247）在javax.xml.bind.ContextFinder.newInstance（ContextFinder.java:234）在javax.xml.bind.ContextFinder.find（ContextFinder.java:462）在javax.xml.bind.JAXBContext.newInstance（JAXBContext.java:641）在javax.xml.bind.JAXBContext.newInstance（JAXBContext.java:584） at org.glassfish.jersey.jaxb.internal.AbstractJaxbProvider.getStoredJaxbContext（AbstractJaxbProvider.java:259）在org.glassfish.jersey.jaxb.internal.AbstractJaxbProvider.getJAXBContext（AbstractJaxbProvider.java:251）在org.glassfish.jersey.jaxb.internal.AbstractJaxbProvider.getMarshaller（AbstractJaxbProvider.java:218）在org.glassfish.jersey.jaxb.internal.AbstractJaxbProvider.getMarshaller（AbstractJaxbProvider.java:185） at org.glassfish.jersey.jaxb.internal.AbstractRootElementJaxbProvider.writeTo（AbstractRootElementJaxbProvider.java:163） at org.glassfish.jersey.message.internal.WriterInterceptorExecutor $ TerminalWriterInterceptor.invokeWriteTo（WriterInterceptorExecutor.java:265） at org.glassfish.jersey.message.internal.WriterInterceptorExecutor $ TerminalWriterInterceptor.aroundWriteTo（WriterInterceptorExecutor.java:250）在org.glassfish.jersey.message.internal.WriterInterceptorExecutor.proceed（WriterInterceptorExecutor.java:162）在org.glassfish.jersey.server.internal.JsonWithPaddingInterceptor.aroundWriteTo（JsonWithPaddingInterceptor.java:106）在org.glassfish.jersey.message.internal.WriterInterceptorExecutor.proceed（WriterInterceptorExecutor.java:162） at org.glassfish.jersey.server.internal.MappableExceptionWrapperInterceptor.aroundWriteTo（MappableExceptionWrapperInterceptor.java:86）在org.glassfish.jersey.message.internal.WriterInterceptorExecutor.proceed（WriterInterceptorExecutor.java:162）在org.glassfish.jersey.message.internal.MessageBodyFactory.writeTo（MessageBodyFactory.java:1128） at org.glassfish.jersey.server.ServerRuntime $ Responder.writeResponse（ServerRuntime.java:664） at org.glassfish.jersey.server.ServerRuntime $ Responder.processResponse（ServerRuntime.java:421）在org.glassfish.jersey.server.ServerRuntime $ Responder.process（ServerRuntime.java:411）在org.glassfish.jersey.server.ServerRuntime $ 2.run（ServerRuntime.java:308）在org.glassfish.jersey.internal.Errors $ 1.call（Errors.java:271）在org.glassfish.jersey.internal.Errors $ 1.call（Errors.java:267）在org.glassfish.jersey.internal.Errors.process（Errors.java:315）在org.glassfish.jersey.internal.Errors.process（Errors.java:297）在org.glassfish.jersey.internal.Errors.process（Errors.java:267）在org.glassfish.jersey.process.internal.RequestScope.runInScope（RequestScope.java:317）在org.glassfish.jersey.server.ServerRuntime.process（ServerRuntime.java:288）在org.glassfish.jersey.server.ApplicationHandler.handle（ApplicationHandler.java:1110）在org.glassfish.jersey.servlet.WebComponent.service（WebComponent.java:401）在org.glassfish.jersey.servlet.ServletContainer.service（ServletContainer.java:386）在org.glassfish.jersey.servlet.ServletContainer.service（ServletContainer.java:335）在org.glassfish.jersey.servlet.ServletContainer.service（ServletContainer.java:222）在org.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java:231）在org.apache.catalina.core.ApplicationFilterChain.doFilter（ApplicationFilterChain.java:166）在org.apache.tomcat.websocket.server.WsFilter.doFilter（WsFilter.java:52）在org.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java:193）在org.apache.catalina.core.ApplicationFilterChain.doFilter（ApplicationFilterChain.java:166）在org.apache.catalina.core.StandardWrapperValve.invoke（StandardWrapperValve.java:198）在org.apache.catalina.core.StandardContextValve.invoke（StandardContextValve.java:96）在org.apache.catalina.authenticator.AuthenticatorBase.invoke（AuthenticatorBase.java:478）在org.apache.catalina.core.StandardHostValve.invoke（StandardHostValve.java:140） at org.apache.catalina.valves.ErrorReportValve.invoke（ErrorReportValve.java:80） at org.apache.catalina.valves.AbstractAccessLogValve.invoke（AbstractAccessLogValve.java:624）在org.apache.catalina.core.StandardEngineValve.invoke（StandardEngineValve.java:87）在org.apache.catalina.connector.CoyoteAdapter.service（CoyoteAdapter.java:342）在org.apache.coyote.http11.Http11Processor.service（Http11Processor.java:799）在org.apache.coyote.AbstractProcessorLight.process（AbstractProcessorLight.java:66） at org.apache.coyote.AbstractProtocol $ ConnectionHandler.process（AbstractProtocol.java:861）在org.apache.tomcat.util.net.NioEndpoint $ SocketProcessor.doRun（NioEndpoint.java:1455）在org.apache.tomcat.util.net.SocketProcessorBase.run（SocketProcessorBase.java:49）在java.util.concurrent.ThreadPoolExecutor.runWorker（ThreadPoolExecutor.java:1142） at java.util.concurrent.ThreadPoolExecutor $ Worker.run（ThreadPoolExecutor.java:617） at org.apache.tomcat.util.threads.TaskThread $ WrappingRunnable.run（TaskThread.java:61）在java.lang.Thread.run（Thread.java:748）

我有一个jax-rs网络服务，如：

@GET
@Path("/getAnalyzedMatches")
@Produces(MediaType.APPLICATION_XML)
public static AnalyzeResponseModel getAnalyzedMatches() throws ClassNotFoundException, SQLException {
    AnalyzeResponseModel response = new AnalyzeResponseModel();
    List<AnalyseResultModel> analyzedMatches = SoveMatchesUtil.getAnalyzedMatches();
    /* try to set object */
    List<Object> objectList = new ArrayList<>();
    for (AnalyseResultModel item : analyzedMatches) {
        objectList.add(item);
    }
    response.setList(objectList);
    return response;
}

这是我的响应模型：

package com.sove.model;

import java.util.List;

import javax.xml.bind.annotation.XmlAttribute;
import javax.xml.bind.annotation.XmlRootElement;

@XmlRootElement(name = "list")
public class AnalyzeResponseModel {
    List<Object> list;

    public AnalyzeResponseModel() {
    }

    public List<Object> getList() {
        return list;
    }

    @XmlAttribute
    public void setList(List<Object> list) {
        this.list = list;
    }

}

这是我的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>sove</groupId>
<artifactId>sove</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>war</packaging>
<build>
    <sourceDirectory>src</sourceDirectory>
    <plugins>
        <plugin>
            <artifactId>maven-compiler-plugin</artifactId>
            <version>3.5.1</version>
            <configuration>
                <source>1.8</source>
                <target>1.8</target>
            </configuration>
        </plugin>
        <plugin>
            <artifactId>maven-war-plugin</artifactId>
            <version>3.0.0</version>
            <configuration>
                <warSourceDirectory>WebContent</warSourceDirectory>
            </configuration>
        </plugin>
    </plugins>
</build>
<dependencies>

    <dependency>
        <groupId>javax.ws.rs</groupId>
        <artifactId>javax.ws.rs-api</artifactId>
        <version>2.0.1</version>
    </dependency>
    <dependency>
        <groupId>org.jboss.resteasy</groupId>
        <artifactId>jaxrs-api</artifactId>
        <version>3.0.12.Final</version>
    </dependency>
    <dependency>
        <groupId>org.glassfish.jersey.bundles</groupId>
        <artifactId>jaxrs-ri</artifactId>
        <version>2.17</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/org.lucee/postgresql -->
    <dependency>
        <groupId>org.lucee</groupId>
        <artifactId>postgresql</artifactId>
        <version>8.3-606.jdbc4</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/log4j/log4j -->
    <dependency>
        <groupId>log4j</groupId>
        <artifactId>log4j</artifactId>
        <version>1.2.17</version>
    </dependency>

</dependencies>

这是我的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>sove</display-name> 
   <servlet> 
      <servlet-name>Jersey RESTful Application</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.sove.service</param-value> 
      </init-param> 
   </servlet> 
   <servlet-mapping> 
      <servlet-name>Jersey RESTful Application</servlet-name> 
      <url-pattern>/*</url-pattern> 
   </servlet-mapping>   
</web-app>

感谢您的帮助。

Answer 1

通过在响应模型（AnalyseResultModel）中将公共属性设置为private来解决问题。

Java调用Web服务问题 - javax.servlet.ServletException：java.lang.NullPointerException

1 个答案: