设置当前线程上下文 class 加载程序后出现 JSF VisitContextFactory 错误

Question

我正在使用 GlassFish 4.1、Mojarra 2.2.7、PrimeFaces 5.2。我正在尝试在 JSF 操作中动态启动 JPA 实体管理器。实体管理器需要加载 JPA 实体 classes 才能执行查询。我在运行时创建并构建了 JPA JAR，所以我尝试将它添加到当前线程中的 class 加载程序：

File jpaJar = getMyJpaJarFile();
ClassLoader currentThreadClassLoader = Thread.currentThread().getContextClassLoader();
URLClassLoader urlClassLoader = new URLClassLoader(
  new URL[]{jpaJar.toURI().toURL()}
, currentThreadClassLoader
);
Thread.currentThread().setContextClassLoader(urlClassLoader);

这使我能够执行 JPQL 查询，但它让我陷入了这个 JSF 混乱：

Severe:   Unable to obtain InjectionProvider from init time FacesContext. Does this container implement the Mojarra Injection SPI?
Severe:   Application was not properly initialized at startup, could not find Factory: javax.faces.component.visit.VisitContextFactory. Attempting to find backup.
Severe:   Error Rendering View[/my.xhtml]
java.lang.IllegalStateException: Could not find backup for factory javax.faces.component.visit.VisitContextFactory. 
  at javax.faces.FactoryFinder$FactoryManager.getFactory(FactoryFinder.java:1135)
  at javax.faces.FactoryFinder.getFactory(FactoryFinder.java:379)
  at javax.faces.component.visit.VisitContext.createVisitContext(VisitContext.java:219)
  at com.sun.faces.application.view.FaceletPartialStateManagementStrategy.saveView(FaceletPartialStateManagementStrategy.java:468)
  at com.sun.faces.application.StateManagerImpl.saveView(StateManagerImpl.java:89)
  at javax.faces.application.StateManager.getViewState(StateManager.java:593)
  at com.sun.faces.context.PartialViewContextImpl.renderState(PartialViewContextImpl.java:483)
  at com.sun.faces.context.PartialViewContextImpl.processPartial(PartialViewContextImpl.java:325)
  at org.primefaces.context.PrimePartialViewContext.processPartial(PrimePartialViewContext.java:60)
  at javax.faces.context.PartialViewContextWrapper.processPartial(PartialViewContextWrapper.java:219)
  at javax.faces.component.UIViewRoot.encodeChildren(UIViewRoot.java:1004)
  at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1856)
  at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:430)
  at com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:133)
  at javax.faces.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:337)
  at javax.faces.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:337)
  at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:120)

如何在不破坏 JSF 的情况下修改 class 加载程序，或解决此问题？

Answer 1

我重现了它，当我将 GlassFish 捆绑的 Mojarra 2.2.7 升级到当前可用的 2.2.11（只需替换 /modules 文件夹中的 javax.faces.jar 时，问题就消失了。事实证明，它已经根据 issue 3341 "Mojarra not resilient to ThreadContextClassLoader replacement".

在 Mojarra 2.2.9 中得到确认和修复

设置当前线程上下文 class 加载程序后出现 JSF VisitContextFactory 错误

JSF VisitContextFactory error after setting current thread context class loader

jsf

jpa

jsf-2