仍然无法将 Tapestry jar 从战争中移出战争中的页面代码

【问题标题】：Unable to move Tapestry jars out of the war with page code inside the war still仍然无法将 Tapestry jar 从战争中移出战争中的页面代码
【发布时间】：2017-02-23 18:53:05
【问题描述】：

我正在尝试进行实验，因为我们有多个网络大战，其中至少有 2 个现在使用 Tapestry 5.4.1。

这个想法是将 Tapestry 相关的 jar 移动到系统类路径上战争之外的一个地方。

但是当我尝试在浏览器中打开 Tapestry 页面时，它会抱怨在准备构建它以供显示时找不到页面类/代码。

我猜战争之外的 Tapestry 类看不到战争内部的页面类。

那么我真的有可能尝试吗？对我来说，它看起来不像 Tapestry jar 应该与 Tapestry 页面代码所在的类路径处于同一级别。

异常跟踪

java.lang.RuntimeException: Exception assembling root component of page ExceptionReport: Exception assembling embedded component 'layout' (of type myproject.web.components.Layout, within ExceptionReport): Could not convert 'style' into a component parameter binding: Exception generating conduit for expression 'style': java.lang.RuntimeException: java.lang.ClassNotFoundException: myproject.web.pages.reassign.ReAssign
    org.apache.tapestry5.internal.pageload.ComponentAssemblerImpl.performAssembleRootComponent(ComponentAssemblerImpl.java:129)
    org.apache.tapestry5.internal.pageload.ComponentAssemblerImpl.access$000(ComponentAssemblerImpl.java:37)
    org.apache.tapestry5.internal.pageload.ComponentAssemblerImpl$1.invoke(ComponentAssemblerImpl.java:81)
    org.apache.tapestry5.internal.pageload.ComponentAssemblerImpl$1.invoke(ComponentAssemblerImpl.java:78)
    org.apache.tapestry5.ioc.internal.OperationTrackerImpl.invoke(OperationTrackerImpl.java:82)
    org.apache.tapestry5.ioc.internal.PerThreadOperationTracker.invoke(PerThreadOperationTracker.java:72)
    org.apache.tapestry5.ioc.internal.RegistryImpl.invoke(RegistryImpl.java:1260)
    org.apache.tapestry5.internal.pageload.ComponentAssemblerImpl.assembleRootComponent(ComponentAssemblerImpl.java:76)
    org.apache.tapestry5.internal.pageload.PageLoaderImpl$3.invoke(PageLoaderImpl.java:197)
    org.apache.tapestry5.internal.pageload.PageLoaderImpl$3.invoke(PageLoaderImpl.java:190)
    org.apache.tapestry5.ioc.internal.OperationTrackerImpl.invoke(OperationTrackerImpl.java:82)
    org.apache.tapestry5.ioc.internal.PerThreadOperationTracker.invoke(PerThreadOperationTracker.java:72)
    org.apache.tapestry5.ioc.internal.RegistryImpl.invoke(RegistryImpl.java:1260)
    org.apache.tapestry5.internal.pageload.PageLoaderImpl.loadPage(PageLoaderImpl.java:189)
    $PageLoader_12d4e53af23f.loadPage(Unknown Source)
    org.apache.tapestry5.internal.services.PageSourceImpl.getPage(PageSourceImpl.java:104)
    $PageSource_12d4e53af23e.getPage(Unknown Source)
    org.apache.tapestry5.internal.services.RequestPageCacheImpl.get(RequestPageCacheImpl.java:86)
    $RequestPageCache_12d4e53af23d.get(Unknown Source)
    $RequestPageCache_12d4e53af20f.get(Unknown Source)
    org.apache.tapestry5.internal.services.DefaultRequestExceptionHandler.renderException(DefaultRequestExceptionHandler.java:254)
    org.apache.tapestry5.internal.services.DefaultRequestExceptionHandler.handleRequestException(DefaultRequestExceptionHandler.java:145)
    $RequestExceptionHandler_12d4e53af1f7.handleRequestException(Unknown Source)
    org.apache.tapestry5.internal.services.RequestErrorFilter.service(RequestErrorFilter.java:42)
    $RequestHandler_12d4e53af1f9.service(Unknown Source)
    org.apache.tapestry5.modules.TapestryModule$3.service(TapestryModule.java:846)
    $RequestHandler_12d4e53af1f9.service(Unknown Source)
    org.apache.tapestry5.modules.TapestryModule$2.service(TapestryModule.java:836)
    $RequestHandler_12d4e53af1f9.service(Unknown Source)
    org.apache.tapestry5.internal.services.StaticFilesFilter.service(StaticFilesFilter.java:89)
    $RequestHandler_12d4e53af1f9.service(Unknown Source)
    $RequestHandler_12d4e53af1ef.service(Unknown Source)
    org.apache.tapestry5.modules.TapestryModule$HttpServletRequestHandlerTerminator.service(TapestryModule.java:256)
    org.got5.tapestry5.jquery.services.AjaxUploadServletRequestFilter.service(AjaxUploadServletRequestFilter.java:27)
    $HttpServletRequestHandler_12d4e53af1f1.service(Unknown Source)
    org.apache.tapestry5.upload.internal.services.MultipartServletRequestFilter.service(MultipartServletRequestFilter.java:45)
    $HttpServletRequestHandler_12d4e53af1f1.service(Unknown Source)
    org.apache.tapestry5.internal.gzip.GZipFilter.service(GZipFilter.java:59)
    $HttpServletRequestHandler_12d4e53af1f1.service(Unknown Source)
    org.apache.tapestry5.internal.services.IgnoredPathsFilter.service(IgnoredPathsFilter.java:62)
    $HttpServletRequestFilter_12d4e53af1eb.service(Unknown Source)
    $HttpServletRequestHandler_12d4e53af1f1.service(Unknown Source)
    org.apache.tapestry5.modules.TapestryModule$1.service(TapestryModule.java:796)
    $HttpServletRequestHandler_12d4e53af1f1.service(Unknown Source)
    $HttpServletRequestHandler_12d4e53af1ea.service(Unknown Source)
    org.apache.tapestry5.TapestryFilter.doFilter(TapestryFilter.java:166)
root cause

org.apache.tapestry5.ioc.internal.OperationException: Exception assembling embedded component 'layout' (of type myproject.web.components.Layout, within ExceptionReport): Could not convert 'style' into a component parameter binding: Exception generating conduit for expression 'style': java.lang.RuntimeException: java.lang.ClassNotFoundException: myproject.web.pages.reassign.ReAssign [at classpath:myproject/web/pages/ExceptionReport.tml, line 3]
    org.apache.tapestry5.ioc.internal.OperationTrackerImpl.logAndRethrow(OperationTrackerImpl.java:186)
    org.apache.tapestry5.ioc.internal.OperationTrackerImpl.run(OperationTrackerImpl.java:62)
    org.apache.tapestry5.ioc.internal.PerThreadOperationTracker.run(PerThreadOperationTracker.java:60)
    org.apache.tapestry5.ioc.internal.RegistryImpl.run(RegistryImpl.java:1254)
    org.apache.tapestry5.internal.pageload.ComponentAssemblerImpl.assembleEmbeddedComponent(ComponentAssemblerImpl.java:158)
    org.apache.tapestry5.internal.pageload.PageLoaderImpl$12.execute(PageLoaderImpl.java:963)
    org.apache.tapestry5.internal.pageload.ComponentAssemblerImpl.runActions(ComponentAssemblerImpl.java:229)
    org.apache.tapestry5.internal.pageload.ComponentAssemblerImpl.performAssembleRootComponent(ComponentAssemblerImpl.java:105)
    org.apache.tapestry5.internal.pageload.ComponentAssemblerImpl.access$000(ComponentAssemblerImpl.java:37)
    org.apache.tapestry5.internal.pageload.ComponentAssemblerImpl$1.invoke(ComponentAssemblerImpl.java:81)
    org.apache.tapestry5.internal.pageload.ComponentAssemblerImpl$1.invoke(ComponentAssemblerImpl.java:78)
    org.apache.tapestry5.ioc.internal.OperationTrackerImpl.invoke(OperationTrackerImpl.java:82)
    org.apache.tapestry5.ioc.internal.PerThreadOperationTracker.invoke(PerThreadOperationTracker.java:72)
    org.apache.tapestry5.ioc.internal.RegistryImpl.invoke(RegistryImpl.java:1260)
    org.apache.tapestry5.internal.pageload.ComponentAssemblerImpl.assembleRootComponent(ComponentAssemblerImpl.java:76)
    org.apache.tapestry5.internal.pageload.PageLoaderImpl$3.invoke(PageLoaderImpl.java:197)
    org.apache.tapestry5.internal.pageload.PageLoaderImpl$3.invoke(PageLoaderImpl.java:190)
    org.apache.tapestry5.ioc.internal.OperationTrackerImpl.invoke(OperationTrackerImpl.java:82)
    org.apache.tapestry5.ioc.internal.PerThreadOperationTracker.invoke(PerThreadOperationTracker.java:72)
    org.apache.tapestry5.ioc.internal.RegistryImpl.invoke(RegistryImpl.java:1260)
    org.apache.tapestry5.internal.pageload.PageLoaderImpl.loadPage(PageLoaderImpl.java:189)
    $PageLoader_12d4e53af23f.loadPage(Unknown Source)
    org.apache.tapestry5.internal.services.PageSourceImpl.getPage(PageSourceImpl.java:104)
    $PageSource_12d4e53af23e.getPage(Unknown Source)
    org.apache.tapestry5.internal.services.RequestPageCacheImpl.get(RequestPageCacheImpl.java:86)
    $RequestPageCache_12d4e53af23d.get(Unknown Source)
    $RequestPageCache_12d4e53af20f.get(Unknown Source)
    org.apache.tapestry5.internal.services.DefaultRequestExceptionHandler.renderException(DefaultRequestExceptionHandler.java:254)
    org.apache.tapestry5.internal.services.DefaultRequestExceptionHandler.handleRequestException(DefaultRequestExceptionHandler.java:145)
    $RequestExceptionHandler_12d4e53af1f7.handleRequestException(Unknown Source)
    org.apache.tapestry5.internal.services.RequestErrorFilter.service(RequestErrorFilter.java:42)
    $RequestHandler_12d4e53af1f9.service(Unknown Source)
    org.apache.tapestry5.modules.TapestryModule$3.service(TapestryModule.java:846)
    $RequestHandler_12d4e53af1f9.service(Unknown Source)
    org.apache.tapestry5.modules.TapestryModule$2.service(TapestryModule.java:836)
    $RequestHandler_12d4e53af1f9.service(Unknown Source)
    org.apache.tapestry5.internal.services.StaticFilesFilter.service(StaticFilesFilter.java:89)
    $RequestHandler_12d4e53af1f9.service(Unknown Source)
    $RequestHandler_12d4e53af1ef.service(Unknown Source)
    org.apache.tapestry5.modules.TapestryModule$HttpServletRequestHandlerTerminator.service(TapestryModule.java:256)
    org.got5.tapestry5.jquery.services.AjaxUploadServletRequestFilter.service(AjaxUploadServletRequestFilter.java:27)
    $HttpServletRequestHandler_12d4e53af1f1.service(Unknown Source)
    org.apache.tapestry5.upload.internal.services.MultipartServletRequestFilter.service(MultipartServletRequestFilter.java:45)
    $HttpServletRequestHandler_12d4e53af1f1.service(Unknown Source)
    org.apache.tapestry5.internal.gzip.GZipFilter.service(GZipFilter.java:59)
    $HttpServletRequestHandler_12d4e53af1f1.service(Unknown Source)
    org.apache.tapestry5.internal.services.IgnoredPathsFilter.service(IgnoredPathsFilter.java:62)
    $HttpServletRequestFilter_12d4e53af1eb.service(Unknown Source)
    $HttpServletRequestHandler_12d4e53af1f1.service(Unknown Source)
    org.apache.tapestry5.modules.TapestryModule$1.service(TapestryModule.java:796)
    $HttpServletRequestHandler_12d4e53af1f1.service(Unknown Source)
    $HttpServletRequestHandler_12d4e53af1ea.service(Unknown Source)
    org.apache.tapestry5.TapestryFilter.doFilter(TapestryFilter.java:166)

【问题讨论】：

  • 我认为这条评论与 Tapestry 无关，而是 Tomcat 类路径问题。你到底把挂毯罐放在哪里？确保你熟悉这个：tomcat.apache.org/tomcat-8.5-doc/class-loader-howto.html
  • 感谢您的回复，我尝试将 jar 移动到外部文件夹，并且该位置的 jar 对 tomcat 的 Common 类加载器可见，使用 common.loader 属性引用该外部位置的所有 jar .
  • 我理解的问题是现在在父类加载器中的 Tapestry 内部类的页面类可见性（在这种情况下很常见）。因此，当请求第一个布局页面时，Tapestry 会尝试构建和组装它，并且控制位于 Common 类加载器中，当 Tapestry 内部类尝试加载另一个页面时，它会尝试在原始布局页面中注入另一个页面，然后它会尝试查找该页面类（在这种情况下为查看页面），并且由于页面代码仍在子类加载器中，即 webappX 它无法找到该类并失败。

标签： tapestry


【解决方案1】：

几天前，在JBoss 7.0.0.GA下做一个新项目，我被这个问题严重击中；我调查了这个问题，发现了万恶之源：塑料类“org.apache.tapestry5.internal.plastic.asm.ClassWriter”。

用于通过塑料查找（和加载）类的类加载器实际上与应用服务器不兼容。需要一个应用服务器来强制执行类加载隔离，而塑料会忽略这一点。 无论如何，可以修补塑料以解决问题；这里我附上一个补丁，请一些开发者转发并将这个补丁应用到 5.4.x 分支和 5.5。

我还要感谢这些帮助我解决问题的人：

Unable to move Tapestry jars out of the war with page code inside the war still https://blog.progs.be/50/tapestry-classloading-problems-on-jboss

问候

这里是原始代码：

1752 protected String getCommonSuperClass(final String type1, final String type2) {
1753   Class<?> c, d;
1754   ClassLoader classLoader = getClass().getClassLoader();
1755   try {
1756     c = Class.forName(type1.replace('/', '.'), false, classLoader);
1757     d = Class.forName(type2.replace('/', '.'), false, classLoader);
1758   } catch (Exception e) {
1759     throw new RuntimeException(e.toString());
1760   }
1761   if (c.isAssignableFrom(d)) {
1762     return type1;
1763   }
1764   if (d.isAssignableFrom(c)) {
1765     return type2;
1766   }
1767   if (c.isInterface() || d.isInterface()) {
1768     return "java/lang/Object";
1769   } else {
1770   do {
1771     c = c.getSuperclass();
1772   } while (!c.isAssignableFrom(d));
1773   return c.getName().replace('.', '/');
1774   }
1775 }

这是修补后的代码：

1752 protected String getCommonSuperClass(final String type1, final String type2) {
1753   Class<?> c, d;
1754   ClassLoader classLoader = getClass().getClassLoader();
1755   try {
1756     c = Class.forName(type1.replace('/', '.'), false, classLoader);
1757     d = Class.forName(type2.replace('/', '.'), false, classLoader);
1758   } catch (Exception e) {
// --- ARZILLO PATCH BEGIN -----------------------------------------------------------

         System.err.println("WARNING: type1:" + type1 + ", type2: " + type2 + ", exception: " + e + ", classLoader: " + classLoader +", attempting to use the classloader of the current thread");

         classLoader = Thread.currentThread().getContextClassLoader();
         if ( classLoader != null ) {
           try {
             c = Class.forName(type1.replace('/', '.'), false, classLoader);
             d = Class.forName(type2.replace('/', '.'), false, classLoader);
           }
           catch (Exception e_inner) {
             System.err.println("ERROR 1: type1:" + type1 + ", type2: " + type2 + ", e_inner: " + e_inner + ", classLoader: " + classLoader +", failed even using the classloader of the current thread");
             throw new RuntimeException(e_inner.toString());
           }
         }
         else {
           System.err.println("ERROR 2: type1:" + type1 + ", type2: " + type2 + ", exception: " + e + ", classLoader: " + classLoader +", unable to get the classloader of the current thread");
           throw new RuntimeException(e.toString());
         }
// --- ARZILLO PATCH END ------------------------------------------------    -----------
1760   }
1761   if (c.isAssignableFrom(d)) {
1762     return type1;
1763   }
1764   if (d.isAssignableFrom(c)) {
1765     return type2;
1766   }
1767   if (c.isInterface() || d.isInterface()) {
1768     return "java/lang/Object";
1779   } else {
1770     do {
1771       c = c.getSuperclass();
1772     } while (!c.isAssignableFrom(d));
1773   return c.getName().replace('.', '/');
1774   }
1775 }

【讨论】：

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