java.lang.NoClassDefFoundError: com/fasterxml/jackson/annotation/JsonView

本文介绍了解决Activiti流程引擎在启动过程中遇到的NoClassDefFoundError异常的方法,该异常与缺失jackson-annotations依赖有关。文章提供了具体的解决步骤,包括手动添加jar包和在pom.xml文件中引入依赖。

摘要生成于 C知道 ,由 DeepSeek-R1 满血版支持, 前往体验 >

1、错误描述

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'processEngineConfiguration' defined in class path resource [activiti.cfg.xml]: Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.activiti.engine.impl.cfg.StandaloneInMemProcessEngineConfiguration]: Constructor threw exception; nested exception is java.lang.NoClassDefFoundError: com/fasterxml/jackson/annotation/JsonView
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:1105)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1050)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:510)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482)
	at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306)
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197)
	at org.activiti.engine.impl.cfg.BeansConfigurationHelper.parseProcessEngineConfiguration(BeansConfigurationHelper.java:36)
	at org.activiti.engine.impl.cfg.BeansConfigurationHelper.parseProcessEngineConfigurationFromResource(BeansConfigurationHelper.java:48)
	at org.activiti.engine.ProcessEngineConfiguration.createProcessEngineConfigurationFromResource(ProcessEngineConfiguration.java:235)
	at org.activiti.engine.ProcessEngineConfiguration.createProcessEngineConfigurationFromResource(ProcessEngineConfiguration.java:231)
	at org.activiti.engine.impl.test.TestHelper.getProcessEngine(TestHelper.java:228)
	at org.activiti.engine.test.ActivitiRule.initializeProcessEngine(ActivitiRule.java:237)
	at org.activiti.engine.test.ActivitiRule.starting(ActivitiRule.java:205)
	at org.activiti.engine.test.ActivitiRule.startingQuietly(ActivitiRule.java:171)
	at org.activiti.engine.test.ActivitiRule.access$000(ActivitiRule.java:86)
	at org.activiti.engine.test.ActivitiRule$1.evaluate(ActivitiRule.java:124)
	at org.junit.rules.RunRules.evaluate(RunRules.java:20)
	at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
	at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
	at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:675)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)
Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.activiti.engine.impl.cfg.StandaloneInMemProcessEngineConfiguration]: Constructor threw exception; nested exception is java.lang.NoClassDefFoundError: com/fasterxml/jackson/annotation/JsonView
	at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:159)
	at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:89)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:1098)
	... 33 more
Caused by: java.lang.NoClassDefFoundError: com/fasterxml/jackson/annotation/JsonView
	at com.fasterxml.jackson.databind.introspect.JacksonAnnotationIntrospector.<clinit>(JacksonAnnotationIntrospector.java:36)
	at com.fasterxml.jackson.databind.ObjectMapper.<clinit>(ObjectMapper.java:271)
	at org.activiti.engine.impl.cfg.ProcessEngineConfigurationImpl.<init>(ProcessEngineConfigurationImpl.java:585)
	at org.activiti.engine.impl.cfg.StandaloneProcessEngineConfiguration.<init>(StandaloneProcessEngineConfiguration.java:21)
	at org.activiti.engine.impl.cfg.StandaloneInMemProcessEngineConfiguration.<init>(StandaloneInMemProcessEngineConfiguration.java:22)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
	at java.lang.reflect.Constructor.newInstance(Constructor.java:526)
	at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:147)
	... 35 more

java.lang.NullPointerException
	at org.activiti.designer.test.ProcessTestMyProcess.startProcess(ProcessTestMyProcess.java:28)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:606)
	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
	at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
	at org.activiti.engine.test.ActivitiRule$1.evaluate(ActivitiRule.java:126)
	at org.junit.rules.RunRules.evaluate(RunRules.java:20)
	at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
	at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
	at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:675)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)

org.activiti.engine.ActivitiException: Programmatic error: could not instantiate org.activiti.designer.test.ProcessTestMyProcess
	at org.activiti.engine.test.ActivitiRule.finished(ActivitiRule.java:269)
	at org.activiti.engine.test.ActivitiRule.finishedQuietly(ActivitiRule.java:179)
	at org.activiti.engine.test.ActivitiRule.access$400(ActivitiRule.java:86)
	at org.activiti.engine.test.ActivitiRule$1.evaluate(ActivitiRule.java:135)
	at org.junit.rules.RunRules.evaluate(RunRules.java:20)
	at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
	at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
	at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:675)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)
Caused by: java.lang.ClassNotFoundException: org/activiti/designer/test/ProcessTestMyProcess
	at java.lang.Class.forName0(Native Method)
	at java.lang.Class.forName(Class.java:190)
	at org.activiti.engine.test.ActivitiRule.finished(ActivitiRule.java:266)
	... 19 more

2、错误原因

由错误提示可知,是缺少jackson-annotations有关的jar


3、解决办法

(1)将jackson-annotations-2.7.5.jar复制到lib目录下

(2)在pom.xml中添加

<!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-annotations -->
<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-annotations</artifactId>
    <version>2.7.5</version>
</dependency>


### Java 中 `NoClassDefFoundError` 异常与 Jackson 库 当遇到 `NoClassDefFoundError` 错误,特别是在涉及 `com.fasterxml.jackson.annotation.JsonKey` 的情况下,这通常意味着运行时环境中缺少必要的 Jackson 注解库。此类错误表明应用程序尝试访问某个类定义但在类路径中未能找到该类。 为了有效解决这个问题: - **确认依赖项已正确引入** 确保项目的构建配置文件(如 Maven 或 Gradle)已经包含了所有必需的 Jackson 依赖项。对于 Jackson 注解模块来说,应该添加如下依赖[^1]: ```xml <!-- Maven --> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-databind</artifactId> <version>2.13.0</version> <!-- 使用最新稳定版本 --> </dependency> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-core</artifactId> <version>2.13.0</version> </dependency> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-annotations</artifactId> <version>2.13.0</version> </dependency> ``` 或者,在 Gradle 构建脚本中添加相应的依赖声明: ```groovy // Gradle implementation 'com.fasterxml.jackson.core:jackson-databind:2.13.0' implementation 'com.fasterxml.jackson.core:jackson-core:2.13.0' implementation 'com.fasterxml.jackson.core:jackson-annotations:2.13.0' ``` - **验证类路径设置** 检查应用启动时所使用的类路径是否包含上述 JAR 文件。如果是在 IDE 内部开发,则需保证这些库已被正确导入并关联至项目结构之中;如果是打包部署的应用程序,则要确保最终生成的可执行包里也包含了所有的第三方库资源。 - **清理缓存重新编译** 有时本地仓库中的某些元数据可能损坏或过期,建议清除本地 Maven/Gradle 缓存后再试一次完整的构建过程,从而排除因缓存引起的问题可能性。 #### 示例代码片段展示如何使用 Jackson 进行 JSON 处理 下面是一个简单的例子展示了怎样利用 Jackson 将 POJO 转换成 JSON 字符串以及反序列化操作: ```java import com.fasterxml.jackson.databind.ObjectMapper; import java.io.IOException; public class Example { public static void main(String[] args) throws IOException { ObjectMapper mapper = new ObjectMapper(); // 创建一个对象实例 MyBean bean = new MyBean("example", 42); // 将对象转为JSON字符串 String jsonString = mapper.writeValueAsString(bean); System.out.println(jsonString); // 反序列化回对象 MyBean parsedBean = mapper.readValue(jsonString, MyBean.class); System.out.println(parsedBean.getName()); } } ```
评论
添加红包

请填写红包祝福语或标题

红包个数最小为10个

红包金额最低5元

当前余额3.43前往充值 >
需支付:10.00
成就一亿技术人!
领取后你会自动成为博主和红包主的粉丝 规则
hope_wisdom
发出的红包
实付
使用余额支付
点击重新获取
扫码支付
钱包余额 0

抵扣说明:

1.余额是钱包充值的虚拟货币,按照1:1的比例进行支付金额的抵扣。
2.余额无法直接购买下载,可以购买VIP、付费专栏及课程。

余额充值