如果將一個名爲cid的查詢字符串參數附加到URL後，則可以刪除org.jboss.weld.context.NonexistentConversationException

按如下方式獲取簡單的CDI（它也可以是JSF託管bean）bean。如果將一個名爲cid的查詢字符串參數附加到URL後，則可以刪除org.jboss.weld.context.NonexistentConversationException

import java.io.Serializable;  
import javax.inject.Named; 
import javax.faces.view.ViewScoped; 

@Named 
@ViewScoped 
public class TestManagedBean implements Serializable 
{ 
    private static final long serialVersionUID=1L; 

    public TestManagedBean() {} 
}

如果此豆通過與命名cid查詢字符串參數這是需要一個@ConversationScoped CDI XHTML頁面訪問管理的bean（其可以意外/故意地由最終用戶太所附），異常看起來像下面這樣被拋出。

Severe: Error Rendering View[/Test.xhtml] 
org.jboss.weld.context.NonexistentConversationException: WELD-000321: No conversation found to restore for id 1 
    at org.jboss.weld.context.AbstractConversationContext.initialize(AbstractConversationContext.java:259) 
    at org.jboss.weld.context.http.LazyHttpConversationContextImpl.initialize(LazyHttpConversationContextImpl.java:68) 
    at org.jboss.weld.context.http.LazyHttpConversationContextImpl.checkContextInitialized(LazyHttpConversationContextImpl.java:93) 
    at org.jboss.weld.context.AbstractConversationContext.getCurrentConversation(AbstractConversationContext.java:445) 
    at org.jboss.weld.jsf.ConversationAwareViewHandler.getActionURL(ConversationAwareViewHandler.java:111) 
    at com.sun.faces.renderkit.html_basic.FormRenderer.getActionStr(FormRenderer.java:250) 
    at com.sun.faces.renderkit.html_basic.FormRenderer.encodeBegin(FormRenderer.java:143) 
    at javax.faces.component.UIComponentBase.encodeBegin(UIComponentBase.java:864) 
    at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1854) 
    at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1859) 
    at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1859) 
    at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:456) 
    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) 
    at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101) 
    at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:219) 
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:647) 
    at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1682) 
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:318) 
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:160) 
    at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:734) 
    at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:673) 
    at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:99) 
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:174) 
    at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:415) 
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:282) 
    at com.sun.enterprise.v3.services.impl.ContainerMapper$HttpHandlerCallable.call(ContainerMapper.java:459) 
    at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:167) 
    at org.glassfish.grizzly.http.server.HttpHandler.runService(HttpHandler.java:201) 
    at org.glassfish.grizzly.http.server.HttpHandler.doHandle(HttpHandler.java:175) 
    at org.glassfish.grizzly.http.server.HttpServerFilter.handleRead(HttpServerFilter.java:235) 
    at org.glassfish.grizzly.filterchain.ExecutorResolver$9.execute(ExecutorResolver.java:119) 
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeFilter(DefaultFilterChain.java:284) 
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeChainPart(DefaultFilterChain.java:201) 
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.execute(DefaultFilterChain.java:133) 
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.process(DefaultFilterChain.java:112) 
    at org.glassfish.grizzly.ProcessorExecutor.execute(ProcessorExecutor.java:77) 
    at org.glassfish.grizzly.nio.transport.TCPNIOTransport.fireIOEvent(TCPNIOTransport.java:561) 
    at org.glassfish.grizzly.strategies.AbstractIOStrategy.fireIOEvent(AbstractIOStrategy.java:112) 
    at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.run0(WorkerThreadIOStrategy.java:117) 
    at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.access$100(WorkerThreadIOStrategy.java:56) 
    at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy$WorkerThreadRunnable.run(WorkerThreadIOStrategy.java:137) 
    at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:565) 
    at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.run(AbstractThreadPool.java:545) 
    at java.lang.Thread.run(Thread.java:745) 

Warning: StandardWrapperValve[Faces Servlet]: Servlet.service() for servlet Faces Servlet threw exception 
org.jboss.weld.context.NonexistentConversationException: WELD-000321: No conversation found to restore for id 1 
    at org.jboss.weld.context.AbstractConversationContext.initialize(AbstractConversationContext.java:259) 
    at org.jboss.weld.context.http.LazyHttpConversationContextImpl.initialize(LazyHttpConversationContextImpl.java:68) 
    at org.jboss.weld.context.http.LazyHttpConversationContextImpl.checkContextInitialized(LazyHttpConversationContextImpl.java:93) 
    at org.jboss.weld.context.AbstractConversationContext.getCurrentConversation(AbstractConversationContext.java:445) 
    at org.jboss.weld.jsf.ConversationAwareViewHandler.getActionURL(ConversationAwareViewHandler.java:111) 
    at com.sun.faces.renderkit.html_basic.FormRenderer.getActionStr(FormRenderer.java:250) 
    at com.sun.faces.renderkit.html_basic.FormRenderer.encodeBegin(FormRenderer.java:143) 
    at javax.faces.component.UIComponentBase.encodeBegin(UIComponentBase.java:864) 
    at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1854) 
    at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1859) 
    at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1859) 
    at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:456) 
    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) 
    at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101) 
    at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:219) 
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:647) 
    at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1682) 
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:318) 
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:160) 
    at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:734) 
    at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:673) 
    at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:99) 
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:174) 
    at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:415) 
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:282) 
    at com.sun.enterprise.v3.services.impl.ContainerMapper$HttpHandlerCallable.call(ContainerMapper.java:459) 
    at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:167) 
    at org.glassfish.grizzly.http.server.HttpHandler.runService(HttpHandler.java:201) 
    at org.glassfish.grizzly.http.server.HttpHandler.doHandle(HttpHandler.java:175) 
    at org.glassfish.grizzly.http.server.HttpServerFilter.handleRead(HttpServerFilter.java:235) 
    at org.glassfish.grizzly.filterchain.ExecutorResolver$9.execute(ExecutorResolver.java:119) 
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeFilter(DefaultFilterChain.java:284) 
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeChainPart(DefaultFilterChain.java:201) 
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.execute(DefaultFilterChain.java:133) 
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.process(DefaultFilterChain.java:112) 
    at org.glassfish.grizzly.ProcessorExecutor.execute(ProcessorExecutor.java:77) 
    at org.glassfish.grizzly.nio.transport.TCPNIOTransport.fireIOEvent(TCPNIOTransport.java:561) 
    at org.glassfish.grizzly.strategies.AbstractIOStrategy.fireIOEvent(AbstractIOStrategy.java:112) 
    at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.run0(WorkerThreadIOStrategy.java:117) 
    at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.access$100(WorkerThreadIOStrategy.java:56) 
    at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy$WorkerThreadRunnable.run(WorkerThreadIOStrategy.java:137) 
    at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:565) 
    at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.run(AbstractThreadPool.java:545) 
    at java.lang.Thread.run(Thread.java:745)

可以此異常無論如何避免，即使一個名爲cid參數添加到URL？

來源

2014-11-04 Tiny

這是特定於焊接（執行），而不是CDI（API）。目前的Weld 2.2.x版本沒有簡單的原生方法來禁用它。然而，Weld允許您通過HttpConversationContext#setParameterName()將請求參數名稱cid更改爲其他內容。你可以將它設置爲應用程序啓動期間的java.util.UUID值。

import javax.faces.bean.ManagedBean; 
import javax.faces.bean.ApplicationScoped; 
import org.jboss.weld.context.http.HttpConversationContext; 

@ManagedBean(eager=true) 
@ApplicationScoped 
public class Application { 

    @Inject 
    private HttpConversationContext conversationContext; 

    @PostConstruct 
    public void init() { 
     hideConversationScope(); 
    } 

    /** 
    * "Hide" conversation scope by replacing its default "cid" parameter name 
    * by something unpredictable. 
    */ 
    private void hideConversationScope() { 
     conversationContext.setParameterName(UUID.randomUUID().toString()); 
    } 

}

不幸的是，CDI沒有eager=true的任何等價物。另一種方法是，如果你的手已經EJB：

import javax.ejb.Startup; 
import javax.ejb.Singleton; 

@Startup 
@Singleton 
public class Application {

（你可能要添加@TransactionAttribute(NOT_SUPPORTED)關閉不必要的DB事務管理它周圍）

或者，如果你手中已經OmniFaces ：

import org.omnifaces.cdi.Startup; 

@Startup 
public class Application {

來源

2014-11-04 21:03:43 BalusC

這是工作，但應用範圍的bean似乎並沒有即時加載，除非它例如，從像'＃{application.someUnusedProperty}'這樣的EL上下文中明確引用。與JSF管理的bean不同，似乎沒有與JSF管理的bean相似的'Named（eager = true）'，ManagedBean（eager = true）'）。 – Tiny 2014-11-04 21:33:32

現在進展順利。謝謝:) – Tiny 2014-11-04 21:41:57

我收到服務器日誌上的消息，如'嚴重：沒有有效的EE環境注入org.omnifaces.cdi.eager.EagerBeansRepository'，但我看到[this]後避免它（http://stackoverflow.com/a/25741716/1391249）回答。 – Tiny 2014-11-04 21:56:09

有一個在AbstractConversationContext的競爭條件時創建的第一次談話範圍，如果它是一個會議的第一次請求。假設這樣的場景

用戶請求一個JSF頁面
焊接創建了一個對話的 AbstractConversationContext.associate（）
映射因爲它是第一個請求，沒有會話。焊接在請求中保留此地圖
會話範圍的bean已創建並放入地圖。
在某處，創建會話
在呈現階段，服務器發回部分響應。頁面需要一些jsf資源，例如，jsf2 ajax或jsf資源
瀏覽器請求新的jsf資源
此時第一個請求尚未完成。所以它不會達到 dissociate（）並且不會在會話中放置會話映射。
同時第二個請求到達associate（）。會話中沒有會話映射，並且會話已存在。它把它的新地圖！ < ====
然後，即使第一個請求到達dissociate（），因爲已經是一個地圖，它不再把它的主人。< ====

快速而髒的修復始終是在associate（）之前創建會話。然而，最好是在地圖合併中解離（）

請參閱：

https://issues.jboss.org/browse/WELD-1418

WELD-1500 issue

來源

2017-04-11 09:20:59

根據你發佈的鏈接，這個（相同）錯誤的原因被固定在2.1Beta1和2.1已經發布了3.5年前！在新版本中它仍然是一個問題嗎？然後創建一個新的焊接問題並鏈接到該問題！ – Kukeltje 2017-04-11 10:51:59

如果將一個名爲cid的查詢字符串參數附加到URL後，則可以刪除org.jboss.weld.context.NonexistentConversationException

回答

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