Struts启动问题:Caused by: com.opensymphony.xwork2.inject.DependencyException

本文详细解析了在Struts2框架配置过程中遇到的问题及解决办法。主要原因是配置文件路径设置错误导致框架无法正常初始化。

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今天在配置struts2的时候遇到的这个问题:
其主要原因就是没有加载到struts的配置文件。
因为我把web.xml配置改为如下:
<filter>
<filter-name>struts2</filter-name>
<filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
<init-param>
<param-name>config</param-name>
[color=red]<param-value>classpath:config/struts/struts.xml</param-value>[/color]
</init-param>
</filter>
<filter-mapping>
<filter-name>struts2</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>

原因就出在红色部分,我把路径前加了一个classpath:,为此它找不到配置文件了,
去掉classpath: 就OK

com.opensymphony.xwork2.inject.DependencyException: com.opensymphony.xwork2.inject.ContainerImpl$MissingDependencyException: No mapping found for dependency [type=com.opensymphony.xwork2.ObjectFactory, name='default'] in public void com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.setObjectFactory(com.opensymphony.xwork2.ObjectFactory).
at com.opensymphony.xwork2.inject.ContainerImpl.addInjectorsForMembers(ContainerImpl.java:144)
at com.opensymphony.xwork2.inject.ContainerImpl.addInjectorsForMethods(ContainerImpl.java:113)
at com.opensymphony.xwork2.inject.ContainerImpl.addInjectors(ContainerImpl.java:90)
at com.opensymphony.xwork2.inject.ContainerImpl.addInjectors(ContainerImpl.java:86)
at com.opensymphony.xwork2.inject.ContainerImpl$1.create(ContainerImpl.java:71)
at com.opensymphony.xwork2.inject.ContainerImpl$1.create(ContainerImpl.java:67)
at com.opensymphony.xwork2.inject.util.ReferenceCache$CallableCreate.call(ReferenceCache.java:150)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
at com.opensymphony.xwork2.inject.util.ReferenceCache.internalCreate(ReferenceCache.java:76)
at com.opensymphony.xwork2.inject.util.ReferenceCache.get(ReferenceCache.java:116)
at com.opensymphony.xwork2.inject.ContainerImpl.inject(ContainerImpl.java:490)
at com.opensymphony.xwork2.inject.ContainerImpl$6.call(ContainerImpl.java:530)
at com.opensymphony.xwork2.inject.ContainerImpl$6.call(ContainerImpl.java:528)
at com.opensymphony.xwork2.inject.ContainerImpl.callInContext(ContainerImpl.java:580)
at com.opensymphony.xwork2.inject.ContainerImpl.inject(ContainerImpl.java:528)
at com.opensymphony.xwork2.config.impl.DefaultConfiguration.reloadContainer(DefaultConfiguration.java:233)
at com.opensymphony.xwork2.config.ConfigurationManager.getConfiguration(ConfigurationManager.java:66)
at org.apache.struts2.dispatcher.Dispatcher.init_PreloadConfiguration(Dispatcher.java:390)
at org.apache.struts2.dispatcher.Dispatcher.init(Dispatcher.java:437)
at org.apache.struts2.dispatcher.ng.InitOperations.initDispatcher(InitOperations.java:74)
at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.init(StrutsPrepareAndExecuteFilter.java:51)
at org.apache.catalina.core.ApplicationFilterConfig.initFilter(ApplicationFilterConfig.java:277)
at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:258)
at org.apache.catalina.core.ApplicationFilterConfig.setFilterDef(ApplicationFilterConfig.java:382)
at org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:103)
at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:4650)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5306)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:901)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:877)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:618)
at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:1100)
at org.apache.catalina.startup.HostConfig$DeployDirectory.run(HostConfig.java:1618)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:439)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:662)
Caused by: com.opensymphony.xwork2.inject.ContainerImpl$MissingDependencyException: No mapping found for dependency [type=com.opensymphony.xwork2.ObjectFactory, name='default'] in public void com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.setObjectFactory(com.opensymphony.xwork2.ObjectFactory).
at com.opensymphony.xwork2.inject.ContainerImpl.createParameterInjector(ContainerImpl.java:239)
at com.opensymphony.xwork2.inject.ContainerImpl.getParametersInjectors(ContainerImpl.java:229)
at com.opensymphony.xwork2.inject.ContainerImpl$MethodInjector.<init>(ContainerImpl.java:293)
at com.opensymphony.xwork2.inject.ContainerImpl$3.create(ContainerImpl.java:117)
at com.opensymphony.xwork2.inject.ContainerImpl$3.create(ContainerImpl.java:114)
at com.opensymphony.xwork2.inject.ContainerImpl.addInjectorsForMembers(ContainerImpl.java:141)
... 39 more
2013-4-17 16:21:33 org.apache.catalina.core.StandardContext filterStart
严重: Exception starting filter struts2
com.opensymphony.xwork2.inject.ContainerImpl$MissingDependencyException: No mapping found for dependency [type=com.opensymphony.xwork2.ObjectFactory, name='default'] in public void com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.setObjectFactory(com.opensymphony.xwork2.ObjectFactory). - Class: com.opensymphony.xwork2.inject.ContainerImpl
File: ContainerImpl.java
Method: addInjectorsForMembers
Line: 144 - com/opensymphony/xwork2/inject/ContainerImpl.java:144:-1
at org.apache.struts2.dispatcher.Dispatcher.init(Dispatcher.java:450)
at org.apache.struts2.dispatcher.ng.InitOperations.initDispatcher(InitOperations.java:74)
at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.init(StrutsPrepareAndExecuteFilter.java:51)
at org.apache.catalina.core.ApplicationFilterConfig.initFilter(ApplicationFilterConfig.java:277)
at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:258)
at org.apache.catalina.core.ApplicationFilterConfig.setFilterDef(ApplicationFilterConfig.java:382)
at org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:103)
at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:4650)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5306)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:901)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:877)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:618)
at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:1100)
at org.apache.catalina.startup.HostConfig$DeployDirectory.run(HostConfig.java:1618)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:439)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:662)
Caused by: com.opensymphony.xwork2.inject.DependencyException: com.opensymphony.xwork2.inject.ContainerImpl$MissingDependencyException: No mapping found for dependency [type=com.opensymphony.xwork2.ObjectFactory, name='default'] in public void com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.setObjectFactory(com.opensymphony.xwork2.ObjectFactory).
at com.opensymphony.xwork2.inject.ContainerImpl.addInjectorsForMembers(ContainerImpl.java:144)
at com.opensymphony.xwork2.inject.ContainerImpl.addInjectorsForMethods(ContainerImpl.java:113)
at com.opensymphony.xwork2.inject.ContainerImpl.addInjectors(ContainerImpl.java:90)
at com.opensymphony.xwork2.inject.ContainerImpl.addInjectors(ContainerImpl.java:86)
at com.opensymphony.xwork2.inject.ContainerImpl$1.create(ContainerImpl.java:71)
at com.opensymphony.xwork2.inject.ContainerImpl$1.create(ContainerImpl.java:67)
at com.opensymphony.xwork2.inject.util.ReferenceCache$CallableCreate.call(ReferenceCache.java:150)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
at com.opensymphony.xwork2.inject.util.ReferenceCache.internalCreate(ReferenceCache.java:76)
at com.opensymphony.xwork2.inject.util.ReferenceCache.get(ReferenceCache.java:116)
at com.opensymphony.xwork2.inject.ContainerImpl.inject(ContainerImpl.java:490)
at com.opensymphony.xwork2.inject.ContainerImpl$6.call(ContainerImpl.java:530)
at com.opensymphony.xwork2.inject.ContainerImpl$6.call(ContainerImpl.java:528)
at com.opensymphony.xwork2.inject.ContainerImpl.callInContext(ContainerImpl.java:580)
at com.opensymphony.xwork2.inject.ContainerImpl.inject(ContainerImpl.java:528)
at com.opensymphony.xwork2.config.impl.DefaultConfiguration.reloadContainer(DefaultConfiguration.java:233)
at com.opensymphony.xwork2.config.ConfigurationManager.getConfiguration(ConfigurationManager.java:66)
at org.apache.struts2.dispatcher.Dispatcher.init_PreloadConfiguration(Dispatcher.java:390)
at org.apache.struts2.dispatcher.Dispatcher.init(Dispatcher.java:437)
... 20 more
Caused by: com.opensymphony.xwork2.inject.ContainerImpl$MissingDependencyException: No mapping found for dependency [type=com.opensymphony.xwork2.ObjectFactory, name='default'] in public void com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.setObjectFactory(com.opensymphony.xwork2.ObjectFactory).
at com.opensymphony.xwork2.inject.ContainerImpl.createParameterInjector(ContainerImpl.java:239)
at com.opensymphony.xwork2.inject.ContainerImpl.getParametersInjectors(ContainerImpl.java:229)
at com.opensymphony.xwork2.inject.ContainerImpl$MethodInjector.<init>(ContainerImpl.java:293)
at com.opensymphony.xwork2.inject.ContainerImpl$3.create(ContainerImpl.java:117)
at com.opensymphony.xwork2.inject.ContainerImpl$3.create(ContainerImpl.java:114)
at com.opensymphony.xwork2.inject.ContainerImpl.addInjectorsForMembers(ContainerImpl.java:141)
... 39 more
<think>嗯,用户现在遇到了Dubbo项目启动时的Caused by: java.lang.reflect.InaccessibleObjectException错误,并且可能和之前提到的MetricsReporterFactory自适应扩展接口创建失败有关。我需要先理解这个异常的原因,然后结合之前的解决方案来帮助用户。 首先,InaccessibleObjectException通常和Java的模块系统(JPMS)有关,尤其是在Java 9及以上版本中。当反射尝试访问不可访问的类或成员时,就会抛出这个异常。Dubbo在动态生成扩展类的时候,可能会使用反射,如果目标类所在的模块没有开放相应的包,就会导致这个问题。 用户之前的问题是关于MetricsReporterFactory自适应扩展接口创建失败,当时的解决方法是检查配置文件、注解、类加载等。现在的问题可能与之前的有关联,因为如果Dubbo在生成自适应扩展类时,无法访问某个类,就会触发这个异常。 接下来,我需要考虑可能的解决方案。首先应该检查模块信息(module-info.java),确认是否开放了相关包给Dubbo的反射调用。如果用户的项目使用模块化,可能需要添加opens语句。 另外,检查是否使用了正确的Java版本。Java 9+需要处理模块访问问题,而Java 8则不会有这个问题。如果用户升级了Java版本,可能需要调整模块配置。 然后,考虑JVM参数。可以通过添加--add-opens来临时开放包,解决反射访问的问题。这对于快速验证问题是否由模块系统引起很有帮助。 另外,用户可能需要检查依赖的Dubbo版本是否支持当前Java版本。较旧的Dubbo版本可能不完全兼容Java 9+,升级Dubbo到支持JPMS的版本可能会解决问题。 还有,用户的自定义扩展实现类是否在正确的包下,并且这些包是否被Dubbo的SPI机制正确加载。如果类路径有问题,也可能导致反射无法访问。 最后,结合之前的解决方案,比如清理扩展点缓存、检查@Adaptive注解是否正确使用,以及确认SPI配置文件是否正确,这些都是需要再次确认的点。 可能需要分步骤引导用户检查模块配置、Java版本、JVM参数,然后验证Dubbo版本,最后检查代码和配置。同时,提供具体的代码示例和命令,让用户能够逐步排查问题。</think>#### 分步解决 Dubbo 启动时 `InaccessibleObjectException` 与 `MetricsReporterFactory` 扩展失败问题 --- ### 1. 根本原因定位 `InaccessibleObjectException` 是 Java 模块系统(JPMS)在 Java 9+ 中引入的安全限制,当 **反射访问未开放的模块包** 时触发。结合 `MetricsReporterFactory` 扩展失败,问题通常由以下原因导致: - **模块权限未开放**:Dubbo 动态生成的 `Adaptive` 类需反射访问接口实现类 - **JDK 版本兼容性**:Java 11+ 默认启用模块系统,而旧版 Dubbo(<2.7.15)未完全适配 - **SPI 实现类可见性**:自定义 `MetricsReporterFactory` 实现类未正确开放包访问权限 --- ### 2. 模块系统解决方案 #### 2.1 修改 `module-info.java` 若项目使用模块化开发,需 **显式开放包路径**: ```java module your.module { requires org.apache.dubbo; opens com.your.pkg; // 开放自定义扩展类的包路径 opens com.your.pkg to org.apache.dubbo.core; // 定向开放给Dubbo核心模块 } ``` #### 2.2 JVM 启动参数(临时方案) 添加以下参数绕过模块检查: ```bash --add-opens java.base/java.lang=ALL-UNNAMED --add-opens java.base/sun.reflect=ALL-UNNAMED --add-opens org.apache.dubbo/org.apache.dubbo.common.extension=ALL-UNNAMED ``` --- ### 3. Dubbo 版本适配 | Dubbo 版本 | Java 兼容性 | 建议操作 | |------------|-------------------------|-------------------------| | <2.7.15 | 仅支持 Java 8 | 升级到 Dubbo 3.0+ | | ≥3.0.0 | 支持 Java 11+ 模块系统 | 检查模块配置 | --- ### 4. 扩展点特殊配置 #### 4.1 强制开放反射权限 在自定义 `MetricsReporterFactory` 实现类中添加注解: ```java import org.apache.dubbo.common.extension.Activate; @Activate public class CustomMetricsFactory implements MetricsReporterFactory { // 实现方法 } ``` #### 4.2 检查自适应扩展生成 确保接口方法包含 `@Adaptive` 注解: ```java @SPI("default") public interface MetricsReporterFactory { @Adaptive // 必须标注此注解 MetricsReporter createReporter(URL url); } ``` --- ### 5. 错误排查流程图 ```mermaid graph TD A[启动报错] --> B{是否Java 9+?} B -->|是| C[检查模块配置] B -->|否| D[检查SPI配置文件] C --> E{有module-info.java?} E -->|有| F[添加opens语句] E -->|无| G[添加JVM参数--add-opens] D --> H[验证META-INF/dubbo文件] H --> I[清理ExtensionLoader缓存] ``` --- ### 6. 验证代码片段 ```java // 验证模块开放状态 Module module = CustomMetricsFactory.class.getModule(); System.out.println("是否开放包访问权限: " + module.isOpen("com.your.pkg")); ``` --- ### 相关问题 1. 如何诊断 Dubbo 动态生成的 Adaptive 类? 2. Java 模块化系统如何影响 SPI 机制?[^1] 3. Dubbo 3.0 在 Java 17 下的兼容性注意事项? 4. 如何通过字节码分析扩展点加载失败原因?[^2] [^1]: Dubbo官方文档中关于Java模块化的适配说明 [^2]: 使用arthas进行运行时诊断的技术手册
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