Java 将Jackson添加到POM会导致JsonProcessingException的NoClassDefError

首先，我很抱歉再次提出这个问题。上一次是在3个月前，我发现了一种权宜之计，当时这种方法可以用来证明概念。不幸的是，我真的需要让它正常工作的全部

作为我当前项目的一部分，我需要能够在向Spring服务器发送请求和从Spring服务器发送请求时，自动将对象序列化到JSON和从JSON序列化对象。我被告知要用杰克逊来做这件事。问题是，每次我将Jackson添加到它将构建的POM中时，servlet都会在找不到com.fasterxml.Jackson.core.JsonProcessingException时抛出java.lang.NoClassDefError。我已经检查过了，JsonProcessingException是在战争中应该出现的

我怀疑是Spring试图为servlet自动编写Jackson解析器，但它无法找到所有依赖项。我不知道为什么会这样，因为他们应该被Maven适当地拉进来

My pom.xml和公司具体信息：

<?xml version="1.0" encoding="UTF-8"?>
<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>
    <parent>
        <groupId>com.company.department</groupId>
        <artifactId>project</artifactId>
        <version>1.0-SNAPSHOT</version>
    </parent>

    <artifactId>project-restservice</artifactId>

    <packaging>war</packaging>
    <name>projectMaven Restservice</name>

    <dependencies>
        <dependency>
            <groupId>${project.groupId}</groupId>
            <artifactId>project-common</artifactId>
            <version>1.0-SNAPSHOT</version>

        </dependency>
        <dependency>
            <groupId>${project.groupId}</groupId>
            <artifactId>project-processor</artifactId>
            <version>1.0-SNAPSHOT</version>

        </dependency>

        <dependency>
            <groupId>${project.groupId}</groupId>
            <artifactId>project-ui-service</artifactId>
            <version>1.0-SNAPSHOT</version>

        </dependency>
        <dependency>
            <groupId>com.qualcomm.qes.logging</groupId>
            <artifactId>project-logger</artifactId>
            <scope>compile</scope>
            <exclusions>
                <exclusion>
                    <artifactId>org.slf4j</artifactId>
                    <groupId>com.springsource.slf4j.api</groupId>
                </exclusion>
                <exclusion>
                    <artifactId>org.slf4j</artifactId>
                    <groupId>com.springsource.slf4j.log4j</groupId>
                </exclusion>
            </exclusions>
        </dependency>

        <dependency>
            <groupId>commons-logging</groupId>
            <artifactId>commons-logging</artifactId>
            <scope>provided</scope>
        </dependency>

        <dependency>
            <groupId>com.qualcomm.qes.sso.downstream</groupId>
            <artifactId>sso-downstream-auth</artifactId>
            <exclusions>
                <exclusion>
                    <artifactId>bcprov-jdk15on</artifactId>
                    <groupId>bouncycastle</groupId>
                </exclusion>
            </exclusions>
        </dependency>
        <!-- SpringSource -->

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>org.springframework.web.servlet</artifactId>
            <scope>compile</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>org.springframework.web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>org.springframework.core</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>org.springframework.beans</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>org.springframework.context</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>org.springframework.oxm</artifactId>
            <exclusions>
                <exclusion>
                    <artifactId>xml-apis</artifactId>
                    <groupId>xml-apis</groupId>
                </exclusion>
            </exclusions>
        </dependency>
        <!-- Other -->


        <!-- Jackson JSON Mapper -->
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
            <version>2.5.1</version>
        </dependency>

        <!-- JMS -->
        <dependency>
            <groupId>javax.transaction</groupId>
            <artifactId>com.springsource.javax.transaction</artifactId>
            <scope>compile</scope>
        </dependency>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>com.springsource.javax.servlet</artifactId>
            <scope>provided</scope>
        </dependency>


        <!-- TIBCO JMS -->
        <dependency>
            <groupId>com.tibco</groupId>
            <artifactId>tibjms</artifactId>

        </dependency>

        <!-- TESTS -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>org.springframework.test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <scope>test</scope>
        </dependency>

    </dependencies>

    <build>
        <finalName>${project.artifactId}-${project.version}</finalName>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-war-plugin</artifactId>
                <!-- TODO: wants version number -->
                <configuration>
                    <webResources>
                        <resource>
                            <directory>${basedir}/src/main/webapp/WEB-INF</directory>
                            <filtering>true</filtering>
                            <targetPath>WEB-INF</targetPath>
                            <includes>
                                <include>**/jboss-classloading.xml</include>
                            </includes>
                        </resource>
                    </webResources>
                </configuration>
            </plugin>
        </plugins>
    </build>
    <profiles>
        <profile>
            <id>deploy-war</id>
            <build>
                <plugins>
                    <plugin>
                        <artifactId>maven-antrun-plugin</artifactId>
                        <executions>
                            <execution>
                                <id>deploy-to-server</id>
                                <phase>install</phase>
                                <goals>
                                    <goal>run</goal>
                                </goals>
                                <configuration>
                                    <tasks>
                                        <copy file="${project.build.directory}/${project.artifactId}-${project.version}.war" todir="${project.jboss.home}/standalone/deployments/project.ear/"></copy>
                                    </tasks>
                                </configuration>
                            </execution>
                        </executions>
                    </plugin>
                </plugins>
            </build>
        </profile>


    </profiles>


</project>

如果你需要更多的信息，请告诉我

编辑：

因此，我进行了一些探索并遵循了类似的线程，我设法将其跟踪到自动连接jacksonbean的标记。删除该选项并手动添加转换器，如下所示：

<bean id="jsonMessageConverter" class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter" />

---

结果是相同的错误。所以，至少现在我知道是什么原因导致了它，但是依赖项在那里，所以我不确定为什么它说它找不到它们。

你错过了

Jackson core.jar

。将其添加到您的pom中

<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-core</artifactId>
    <version>2.5.1</version>
</dependency>

com.fasterxml.jackson.core
杰克逊核心
2.5.1

添加、运行并得到相同的错误。@Grendus完全相同？完全相同：上下文初始化失败：org.springframework.beans.factory.BeanCreationException:创建名为“org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter#0”的bean时出错：初始化bean失败；嵌套的异常是java.lang.NoClassDefFoundError:com/fasterxml/jackson/core/JsonProcessingException@Grendus尝试一次清理和重建。在进行了更多的探索之后，我发现Maven没有将依赖项放在服务器的正确位置。将编译后的标记添加到pom修复了该问题。感谢所有的帮助。正如我所解释的，JsonProcessingException.class文件在部署时位于正确的位置。我查过了。它在.war中，并显示在Eclipse依赖插件中。正在提取正确的jackson核心。它只是说它找不到它，我不知道为什么。链接的答案对我没有帮助。我不相信这是一个重复的问题。这个问题似乎是由maven中的暂时依赖项解析引起的，而不是缺少依赖项。下面的答案通过添加显式依赖项解决了这个问题。

@Controller
public class RestServiceWebController extends BaseRestServiceController
{

   @Autowired
   private SampletableService sampletableService;

   @RequestMapping(value="/sample", method=RequestMethod.GET)
   public String customerPortal(ModelMap model)
   {
     return "sample";
   }

  @RequestMapping(value="/testService", method=RequestMethod.GET)
  public @ResponseBody Map<String, String> testMethod()
  {
    logger.info("In testService");
    Map<String,String> testResponse = new HashMap<String, String>();
    testResponse.put("1", "2");
    testResponse.put("3", "4");
    testResponse.put("5", "6");
    testResponse.put("7", "8");
    testResponse.put("9", "0");
    return testResponse;
  }
}

2015-02-19 09:35:56,638 ERROR [org.springframework.web.context.ContextLoader] (ServerService Thread Pool -- 54) Context initialization failed: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter#0': Initialization of bean failed; nested exception is java.lang.NoClassDefFoundError: com/fasterxml/jackson/core/JsonProcessingException
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:529)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:458)
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:295)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:223)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:292)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:194)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:626)
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:932)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:479)
    at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:389)
    at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:294)
    at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:112)
    at org.apache.catalina.core.StandardContext.contextListenerStart(StandardContext.java:3339)
    at org.apache.catalina.core.StandardContext.start(StandardContext.java:3777)
    at org.jboss.as.web.deployment.WebDeploymentService.doStart(WebDeploymentService.java:156)
    at org.jboss.as.web.deployment.WebDeploymentService.access$000(WebDeploymentService.java:60)
    at org.jboss.as.web.deployment.WebDeploymentService$1.run(WebDeploymentService.java:93)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
    at java.util.concurrent.FutureTask.run(FutureTask.java:262)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at java.lang.Thread.run(Thread.java:744)
    at org.jboss.threads.JBossThread.run(JBossThread.java:122)
Caused by: java.lang.NoClassDefFoundError: com/fasterxml/jackson/core/JsonProcessingException
    at java.lang.Class.getDeclaredConstructors0(Native Method)
    at java.lang.Class.privateGetDeclaredConstructors(Class.java:2493)
    at java.lang.Class.getDeclaredConstructors(Class.java:1901)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.determineCandidateConstructors(AutowiredAnnotationBeanPostProcessor.java:230)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.determineConstructorsFromBeanPostProcessors(AbstractAutowireCapableBeanFactory.java:972)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:945)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:487)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:458)
    at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveInnerBean(BeanDefinitionValueResolver.java:271)
    at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveValueIfNecessary(BeanDefinitionValueResolver.java:126)
    at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveManagedList(BeanDefinitionValueResolver.java:353)
    at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveValueIfNecessary(BeanDefinitionValueResolver.java:154)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1387)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1128)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:519)
    ... 22 more

<bean id="jsonMessageConverter" class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter" />

<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-core</artifactId>
    <version>2.5.1</version>
</dependency>