启动错误: org/apache/struts2/convention/DefaultClassFinder$InfoBuildingVisitor :java.lang.IncompatibleClassChangeError

Question

我有一个最初基于XML的Struts2应用程序，但现在我第一次引入了一个基于注释的操作，应用程序在启动时就中断了。

给定以下操作映射，在应用程序启动时，我会得到错误

java.lang.InstantiationError: com.opensymphony.xwork2.util.finder.ClassFinder
    at org.apache.struts2.convention.PackageBasedActionConfigBuilder.findActions(PackageBasedActionConfigBuilder.java:390)
    at org.apache.struts2.convention.PackageBasedActionConfigBuilder.buildActionConfigs(PackageBasedActionConfigBuilder.java:347)
    at org.apache.struts2.convention.ClasspathPackageProvider.loadPackages(ClasspathPackageProvider.java:53)
    at com.opensymphony.xwork2.config.impl.DefaultConfiguration.reloadContainer(DefaultConfiguration.java:199)
    at com.opensymphony.xwork2.config.ConfigurationManager.getConfiguration(ConfigurationManager.java:67)
    at org.apache.struts2.dispatcher.Dispatcher.getContainer(Dispatcher.java:906)
    at org.apache.struts2.dispatcher.Dispatcher.init_PreloadConfiguration(Dispatcher.java:445)
    at org.apache.struts2.dispatcher.Dispatcher.init(Dispatcher.java:486)
    at org.apache.struts2.dispatcher.InitOperations.initDispatcher(InitOperations.java:75)
    at org.apache.struts2.dispatcher.filter.StrutsPrepareAndExecuteFilter.init(StrutsPrepareAndExecuteFilter.java:63)
    at org.apache.catalina.core.ApplicationFilterConfig.initFilter(ApplicationFilterConfig.java:279)

这里有一个类似的问题，但没有人回答，Issue with Struts2 Filter Exception

库使用

• struts2-convention-plugin-2.3.14.3.jar
• struts2-core-2.5.10.1.jar
• struts2-json-plugin-2.5.10.1.jar
• struts2-spring-plugin-2.5.10.1.jar
• struts2-tiles-plugin-2.5.10.1.jar
• xwork-core-2.1.6.jar

更新:我认为-Plugin 2.3.14.3与其他2.5.10.1不兼容，所以我下载了：struts2-convention-plugin-2.5.10.1.jar

现在正在启动

java.lang.IncompatibleClassChangeError: org/apache/struts2/convention/DefaultClassFinder$InfoBuildingVisitor
    at org.apache.struts2.convention.DefaultClassFinder.readClassDef(DefaultClassFinder.java:459) ~[struts2-convention-plugin-2.5.10.1.jar:2.5.10.1]
    at org.apache.struts2.convention.DefaultClassFinder.<init>(DefaultClassFinder.java:90) [struts2-convention-plugin-2.5.10.1.jar:2.5.10.1]
    at org.apache.struts2.convention.PackageBasedActionConfigBuilder.buildClassFinder(PackageBasedActionConfigBuilder.java:397) [struts2-convention-plugin-2.5.10.1.jar:2.5.10.1]
    at org.apache.struts2.convention.PackageBasedActionConfigBuilder.findActions(PackageBasedActionConfigBuilder.java:379) [struts2-convention-plugin-2.5.10.1.jar:2.5.10.1]
    at org.apache.struts2.convention.PackageBasedActionConfigBuilder.buildActionConfigs(PackageBasedActionConfigBuilder.java:335) [struts2-convention-plugin-2.5.10.1.jar:2.5.10.1]
    at org.apache.struts2.convention.ClasspathPackageProvider.loadPackages(ClasspathPackageProvider.java:53) [struts2-convention-plugin-2.5.10.1.jar:2.5.10.1]
    at com.opensymphony.xwork2.config.impl.DefaultConfiguration.reloadContainer(DefaultConfiguration.java:199) [struts2-core-2.5.10.1.jar:2.5.10.1]

解决方案--解决方案是添加ASM5.xJAR，这是Struts对注释的依赖。我们用的是ASM 3.3。我添加了ASM，-Common，-Tree版本5.1Jars.

Answer 1

Struts2-约定插件2.5.10.1具有编译依赖关系

<dependency>
    <groupId>org.apache.commons</groupId>
    <artifactId>commons-lang3</artifactId>
    <version>3.4</version>
</dependency>
<dependency>
    <groupId>org.ow2.asm</groupId>
    <artifactId>asm</artifactId>
    <version>5.1</version>
</dependency>
<dependency>
    <groupId>org.ow2.asm</groupId>
    <artifactId>asm-commons</artifactId>
    <version>5.1</version>
</dependency>

注释：--如果不需要asm和asm-commons依赖项，可以降级为Struts2.5.5。

Answer 2

Struts2使用ASM5x作为公约插件。检查类路径，确保您有适当版本的ASM jars。