tomcat7 +jdk1.8启动报错_tomcat7 启动jdk8项目报错-优快云博客

本文链接：https://blog.youkuaiyun.com/LJ_Java_private/article/details/84639126

在尝试解决项目A由于缺少servlet-api.jar启动报错时，采取了手动添加该jar的方式解决了问题。然而，该方法导致项目B启动报错。分析发现，错误源于错误地为JDK添加了servlet-api.jar。尽管项目B本身没有问题，但项目A的错误处理方式不适用。问题最终通过移除额外的servlet-api.jar并正确配置依赖解决。错误堆栈显示与Activiti引擎的初始化失败有关。

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我有项目A和项目B，当项目A出现以上错误，百度得到图内答案就照做了果然解决了项目A启动报错问题

但是项目B始终启动报错如下：最后发现就是因为有了往jdk添加了servlet-api.jar的操作，导致项目B启动报错

但我肯定B是对的问题出在A ,A启动报错处理方式是错的，

分析A报错原因：是没有获取到servlet-api.jar ，反复写入servlet-api依赖，也看到maven库有相关jar,但仍然报错

最后手动导入servlet-api.jar

启动tomcat成功。。。。。。。。。。。。。。。。。。。。。。。。。。。。。

不明其中缘由！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！

<dependency>
       <groupId>javax.servlet</groupId>
       <artifactId>servlet-api</artifactId>
       <version>2.5</version>
       <scope>provided</scope>
       </dependency>

或

<dependency>
           <groupId>javax.servlet</groupId>
           <artifactId>javax.servlet-api</artifactId>
           <version>3.1.0</version>
           <scope>provided</scope>
       </dependency>

2018-11-29 14:17:16,005 WARN [springframework.web.context.support.XmlWebApplicationContext] - Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'processDefinitionDiagramLayoutResource': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private org.activiti.engine.RuntimeService com.thinkgem.jeesite.modules.act.rest.diagram.services.BaseProcessDefinitionDiagramLayoutResource.runtimeService; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'processEngineFactory': FactoryBean threw exception on object creation; nested exception is java.lang.NullPointerException

2018-11-29 14:17:16,013 ERROR [org.springframework.web.servlet.DispatcherServlet] - Context initialization failed

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'processDefinitionDiagramLayoutResource': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private org.activiti.engine.RuntimeService com.thinkgem.jeesite.modules.act.rest.diagram.services.BaseProcessDefinitionDiagramLayoutResource.runtimeService; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'processEngineFactory': FactoryBean threw exception on object creation; nested exception is java.lang.NullPointerException

at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:334)

at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1208)

at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapa