java.lang.NoSuchFieldError: VERSION_2_3_0 报错解决方案
java.lang.NoSuchFieldError: VERSION_2_3_0 at org.apache.struts2.views.freemarker.FreemarkerManager.createConfiguration(FreemarkerManager.java:331) at org.apache.struts2.views.freemarker.FreemarkerManager.init(FreemarkerManager.java:282) at org.apache.struts2.views.freemarker.FreemarkerManager.getConfiguration(FreemarkerManager.java:269) at org.apache.struts2.dispatcher.DefaultDispatcherErrorHandler.init(DefaultDispatcherErrorHandler.java:47) at org.apache.struts2.dispatcher.Dispatcher.init(Dispatcher.java:488) at org.apache.struts2.dispatcher.ng.InitOperations.initDispatcher(InitOperations.java:74) at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.init(StrutsPrepareAndExecuteFilter.java:57) at org.apache.catalina.core.ApplicationFilterConfig.initFilter(ApplicationFilterConfig.java:281) at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:262) at org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:107) at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:4746) at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5399) 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:633) at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:1114) at org.apache.catalina.startup.HostConfig$DeployDirectory.run(HostConfig.java:1672) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441) 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:619)
好吧, 今天公司主管看到一个新闻说除了 struts 2.3.20.2，2.3.24.2，2.3.28.1 几个版本外其他版本都不安全, 因而
对旧版进行升级, 这个项目不是 maven 项目, 要把 jar 包一个一个替换, 但是不是简单换了 jar 包就行了, 有些旧版特性新版不
一定支持, 新版兼容到的旧系统其他 jar 不一定支持, 所以升级也是一个技术活啊。。。简单解决一个百度上好像都没人讨论
过的一个版本问题, 这个版本问题的解决方案是要替换 freemarker 的包到 freemarker-2.3.23.jar, 也就是最高版本, 同时
也提醒自己遇到问题一定不要慌, 要根据出错提示分步进行解决. 技术上的问题都是有办法解决的, 要安静的思考一下解决方案.
struts2 更新版本操作有关事项备注
struts2 更新版本操作有关事项备注，
更新主要 jar 包：struts2-convention-plugin-version，struts2-core-version, struts2-spring-plugin-version
依赖 jar 包:xwork-core-version
报错应更新有关 jar 包: freemarker-verson，log4j-version
mevan 实例：
<!-- struts2 所有 jar 包 --> <dependency> <groupId>org.apache.struts</groupId> <artifactId>struts2-core</artifactId> <!--<version>2.2.1</version>--> <version>2.3.24.1</version> <exclusions> <exclusion> <groupId>com.sun</groupId> <artifactId>tools</artifactId> </exclusion> </exclusions> </dependency> <dependency> <groupId>org.apache.struts</groupId> <artifactId>struts2-spring-plugin</artifactId> <!--<version>2.2.1</version>--> <version>2.3.24.1</version> </dependency> <dependency> <groupId>org.apache.struts</groupId> <artifactId>struts2-convention-plugin</artifactId> <!--<version>2.2.1</version>--> <version>2.3.24.1</version> </dependency> <dependency> <groupId>org.freemarker</groupId> <artifactId>freemarker</artifactId> <version>2.3.23</version> </dependency><span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">dependency</span><span style="color: rgba(0, 0, 255, 1)">></span> <span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">groupId</span><span style="color: rgba(0, 0, 255, 1)">></span>log4j<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">groupId</span><span style="color: rgba(0, 0, 255, 1)">></span> <span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">artifactId</span><span style="color: rgba(0, 0, 255, 1)">></span>log4j<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">artifactId</span><span style="color: rgba(0, 0, 255, 1)">></span> <span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">version</span><span style="color: rgba(0, 0, 255, 1)">></span>1.2.17<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">version</span><span style="color: rgba(0, 0, 255, 1)">></span> <span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">dependency</span><span style="color: rgba(0, 0, 255, 1)">></span></pre>
xwork-core-version 此包不更新涉及报错：
<filter> <filter-name>StrutsPrepareFilter</filter-name> <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareFilter</filter-class> </filter> <filter> <filter-name>StrutsExecuteFilter</filter-name> <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsExecuteFilter</filter-class> </filter>
此配置文件 类丢失错误
freemarker-verson，log4j-version 包不更新涉及报错：
java.lang.NoSuchFieldError: VERSION_2_3_0 at org.apache.struts2.views.freemarker.FreemarkerManager.createConfiguration(FreemarkerManager.java:331) at org.apache.struts2.views.freemarker.FreemarkerManager.init(FreemarkerManager.java:282) at org.apache.struts2.views.freemarker.FreemarkerManager.getConfiguration(FreemarkerManager.java:269) at org.apache.struts2.dispatcher.DefaultDispatcherErrorHandler.init(DefaultDispatcherErrorHandler.java:47) at org.apache.struts2.dispatcher.Dispatcher.init(Dispatcher.java:488) at org.apache.struts2.dispatcher.ng.InitOperations.initDispatcher(InitOperations.java:74) at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.init(StrutsPrepareAndExecuteFilter.java:57) at org.apache.catalina.core.ApplicationFilterConfig.initFilter(ApplicationFilterConfig.java:281) at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:262) at org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:107) at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:4746) at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5399) 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:633) at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:1114) at org.apache.catalina.startup.HostConfig$DeployDirectory.run(HostConfig.java:1672) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441) at java.util.concurrent.FutureTask$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:619)