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我試圖得到一個最低Vaadin 7.1.12應用程序運行吐出從通過CDI，在Wildfly（最終版）上Wildfly運行Vaadin CDI應用程序會導致空指針異常
注入會話Bean的字符串編輯：解決問題 - 應該注入我的GUI組件，而不是使用「新」。詳情請參閱
後的底部這只是一個UI的按鈕和事件處理程序調用無狀態會話Bean的方法的HelloWorld/POC項目。它基本上工作，直到調用處理程序，然後我得到一個NPE，因爲該bean尚未初始化。 （你可以在底部看到整個日誌，它沒有很好的格式化：o）。
我有兩個Maven項目，一個服務項目和一個Web項目，這兩個模塊都是父類型的。我有bean.xml（在服務項目的META-INF和Web項目的WEB-INF中），但沒有web.xml或ejb-jar.xml或任何其他xml-config文件。
使用部署wildfly Maven插件，Java的8
服務項目運行一切只包含一個非常簡單的會話bean：
package com.xy.zzy.service.session;
import javax.ejb.Stateless;
@Stateless
public class Pingu {
public String ping() {
return "Pingu is alive!";
}
}
Web項目包含一個簡單的用戶界面。
package com.xy.zzy;
import com.vaadin.cdi.CDIUI;
import com.vaadin.server.Constants;
import com.vaadin.server.VaadinRequest;
import com.vaadin.server.VaadinServlet;
import com.vaadin.server.VaadinSession;
import com.vaadin.ui.UI;
import javax.servlet.annotation.WebInitParam;
import javax.servlet.annotation.WebServlet;
@CDIUI
public class MyVaadinUI extends UI {
@WebServlet(urlPatterns = "/*", initParams = {
@WebInitParam(name = VaadinSession.UI_PARAMETER,
value = "com.xy.zzy.MyVaadinUI"),
@WebInitParam(name = Constants.PARAMETER_WIDGETSET,
value = "com.xy.zzy.AppWidgetSet"),
@WebInitParam(name = Constants.SERVLET_PARAMETER_UI_PROVIDER,
value = "com.vaadin.cdi.CDIUIProvider")
})
public static class UIApplicationServlet extends VaadinServlet {}
@Override
protected void init(VaadinRequest request) {
setContent(new MyCompositeEvents());
}
}
最後，企鵝家族EJB在MyCompositeEvent（這是由Eclipse vaadin插件生成的UI組件的一個子類，並且它只是顯示一個按鈕。的實際使用率
package com.xy.zzy;
import com.xy.zzy.service.session.Pingu;
import com.vaadin.ui.Button;
import javax.inject.Inject;
public class MyCompositeEvents extends MyComposite {
@Inject Pingu pingu;
@Override
void doInitialize() {
button_1.addClickListener(new Button.ClickListener() {
@Override
public void buttonClick(Button.ClickEvent clickEvent) {
button_1.setCaption(pingu.ping());
}
});
}
}
在我拉動
<dependencies>
<dependency>
<groupId>javax.enterprise</groupId>
<artifactId>cdi-api</artifactId>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>javax.inject</groupId>
<artifactId>javax.inject</artifactId>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>javax.annotation</groupId>
<artifactId>javax.annotation-api</artifactId>
<version>1.2</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.jboss.spec.javax.annotation</groupId>
<artifactId>jboss-annotations-api_1.2_spec</artifactId>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.jboss.spec.javax.ejb</groupId>
<artifactId>jboss-ejb-api_3.2_spec</artifactId>
<scope>provided</scope>
</dependency>
</dependencies>
服務POM父的pom.xml（冬眠實體時基本CDI注入作品）：
<dependencies>
<dependency>
<groupId>org.hibernate.javax.persistence</groupId>
<artifactId>hibernate-jpa-2.1-api</artifactId>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.jboss.spec.javax.ejb</groupId>
<artifactId>jboss-ejb-api_3.2_spec</artifactId>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.jboss.spec.javax.transaction</groupId>
<artifactId>jboss-transaction-api_1.2_spec</artifactId>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-validator</artifactId>
<scope>provided</scope>
<exclusions>
<exclusion>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-core</artifactId>
<scope>provided</scope>
</dependency>
</dependencies>
和網絡POM：
<dependencies>
<dependency>
<groupId>com.vaadin</groupId>
<artifactId>vaadin-server</artifactId>
<version>${vaadin.version}</version>
</dependency>
<dependency>
<groupId>com.vaadin</groupId>
<artifactId>vaadin-client-compiled</artifactId>
<version>${vaadin.version}</version>
</dependency>
<dependency>
<groupId>com.vaadin</groupId>
<artifactId>vaadin-client</artifactId>
<version>${vaadin.version}</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>com.vaadin</groupId>
<artifactId>vaadin-push</artifactId>
<version>${vaadin.version}</version>
</dependency>
<dependency>
<groupId>com.vaadin</groupId>
<artifactId>vaadin-themes</artifactId>
<version>${vaadin.version}</version>
</dependency>
<dependency>
<groupId>com.vaadin</groupId>
<artifactId>vaadin-cdi</artifactId>
<version>1.0.0.alpha1</version>
<type>jar</type>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.0.1</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>com.xy.zzy</groupId>
<artifactId>xyzzy-service</artifactId>
<version>1.0.0-SNAPSHOT</version>
<type>ejb</type>
</dependency>
</dependencies>
這是當會話bean被調用（NPE）會發生什麼：
13:16:52,165 INFO [org.jboss.as.repository] (management-handler-thread - 17) JBAS014900: Content added at location /Users/xyzzy/Local/wildfly-8.0.0.Final/standalone/data/content/2d/7a1b2b61aca1ab04c8c64a48929d6fa5932084/content
13:16:52,166 INFO [org.jboss.as.server.deployment] (MSC service thread 1-6) JBAS015876: Starting deployment of "xyzzy-web.war" (runtime-name: "xyzzy-web.war")
13:16:52,724 INFO [org.jboss.as.server.deployment] (MSC service thread 1-1) JBAS015877: Stopped deployment xyzzy-web.war (runtime-name: xyzzy-web.war) in 557ms
13:16:52,725 INFO [org.jboss.as.server.deployment] (MSC service thread 1-7) JBAS015876: Starting deployment of "xyzzy-web.war" (runtime-name: "xyzzy-web.war")
13:16:53,197 INFO [org.jboss.weld.deployer] (MSC service thread 1-2) JBAS016002: Processing weld deployment xyzzy-web.war
13:16:53,200 INFO [org.jboss.as.ejb3.deployment.processors.EjbJndiBindingsDeploymentUnitProcessor] (MSC service thread 1-2) JNDI bindings for session bean named Pingu in deployment unit deployment "xyzzy-web.war" are as follows:
java:global/xyzzy-web/Pingu!com.xy.zzy.service.session.Pingu
java:app/xyzzy-web/Pingu!com.xy.zzy.service.session.Pingu
java:module/Pingu!com.xy.zzy.service.session.Pingu
java:global/xyzzy-web/Pingu
java:app/xyzzy-web/Pingu
java:module/Pingu
13:16:53,212 INFO [org.jboss.weld.deployer] (MSC service thread 1-16) JBAS016005: Starting Services for CDI deployment: xyzzy-web.war
13:16:53,216 INFO [org.jboss.weld.deployer] (MSC service thread 1-11) JBAS016008: Starting weld service for deployment xyzzy-web.war
13:16:53,379 INFO [com.vaadin.cdi.internal.VaadinExtension] (MSC service thread 1-12) UIScopedContext registered
13:16:53,442 INFO [com.vaadin.cdi.internal.ContextDeployer] (MSC service thread 1-14) Initializing web context for path /xyzzy-web
13:16:53,442 INFO [com.vaadin.cdi.internal.ContextDeployer] (MSC service thread 1-14) Discovering Vaadin UIs...
13:16:53,443 INFO [com.vaadin.cdi.internal.ContextDeployer] (MSC service thread 1-14) 1 beans inheriting from UI discovered!
13:16:53,443 INFO [com.vaadin.cdi.internal.ContextDeployer] (MSC service thread 1-14) Vaadin UI com.xy.zzy.MyVaadinUI is marked as @CDIUI without context path, this UI is accessible from context root of deployment
13:16:53,443 INFO [com.vaadin.cdi.internal.ContextDeployer] (MSC service thread 1-14) Available Vaadin UIs for CDI deployment []
13:16:53,444 WARNING [com.vaadin.cdi.internal.ContextDeployer] (MSC service thread 1-14) Vaadin related servlet is defined in deployment descriptor, automated deployment of VaadinCDIServlet is now disabled
13:16:53,444 INFO [com.vaadin.cdi.internal.ContextDeployer] (MSC service thread 1-14) Done deploying Vaadin UIs
13:16:53,445 INFO [org.wildfly.extension.undertow] (MSC service thread 1-14) JBAS017534: Registered web context: /xyzzy-web
13:16:53,461 INFO [org.jboss.as.server] (management-handler-thread - 17) JBAS018562: Redeployed "xyzzy-web.war"
13:16:53,461 INFO [org.jboss.as.server] (management-handler-thread - 17) JBAS018565: Replaced deployment "xyzzy-web.war" with deployment "xyzzy-web.war"
13:16:53,462 INFO [org.jboss.as.repository] (management-handler-thread - 17) JBAS014901: Content removed from location /Users/martin/Local/wildfly-8.0.0.Final/standalone/data/content/81/50420b5c937c94c75d3c543ad8b6560901f198/content
13:29:36,571 WARNING [com.vaadin.server.DefaultDeploymentConfiguration] (default task-13)
=================================================================
Vaadin is running in DEBUG MODE.
Add productionMode=true to web.xml to disable debug features.
To show debug window, add ?debug to your application URL.
=================================================================
13:29:36,594 INFO [org.atmosphere.cpr.AtmosphereFramework] (default task-13) Installed AtmosphereHandler com.vaadin.server.communication.PushHandler mapped to context-path: /*
13:29:36,621 INFO [org.atmosphere.cpr.AtmosphereFramework] (default task-13) Auto detecting WebSocketHandler in /WEB-INF/classes/
13:29:36,622 INFO [org.atmosphere.cpr.AtmosphereFramework] (default task-13) Installed WebSocketProtocol org.atmosphere.websocket.protocol.SimpleHttpProtocol
13:29:36,624 INFO [org.atmosphere.cpr.AtmosphereFramework] (default task-13) Atmosphere is using async support: org.atmosphere.container.Servlet30CometSupport running under container: WildFly 8.0.0.Final - 1.0.0.Final using javax.servlet/3.0
13:29:36,627 INFO [org.atmosphere.cpr.AtmosphereFramework] (default task-13) Installed Default AtmosphereInterceptor [Android Interceptor Support, SSE Interceptor Support, JSONP Interceptor Support, Long-Polling Padding Interceptor Support, Atmosphere JavaScript Protocol, Browser disconnection detection]. Set org.atmosphere.cpr.AtmosphereInterceptor.disableDefaults in your xml to disable them.
13:29:36,627 WARNING [org.atmosphere.cpr.AtmosphereFramework] (default task-13) No BroadcasterCache configured. Broadcasted message between client reconnection will be LOST. It is recommended to configure the org.atmosphere.cache.UUIDBroadcasterCache
13:29:36,627 INFO [org.atmosphere.cpr.AtmosphereFramework] (default task-13) Shared ExecutorService supported: true
13:29:36,627 INFO [org.atmosphere.cpr.AtmosphereFramework] (default task-13) HttpSession supported: true
13:29:36,628 INFO [org.atmosphere.cpr.AtmosphereFramework] (default task-13) Using BroadcasterFactory: org.atmosphere.cpr.DefaultBroadcasterFactory
13:29:36,628 INFO [org.atmosphere.cpr.AtmosphereFramework] (default task-13) Using WebSocketProcessor: org.atmosphere.websocket.DefaultWebSocketProcessor
13:29:36,628 INFO [org.atmosphere.cpr.AtmosphereFramework] (default task-13) Using Broadcaster: org.atmosphere.cpr.DefaultBroadcaster
13:29:36,628 INFO [org.atmosphere.cpr.AtmosphereFramework] (default task-13) Atmosphere Framework 1.0.18.vaadin3 started.
13:29:36,628 INFO [org.atmosphere.cpr.AtmosphereFramework] (default task-13) Installed AtmosphereInterceptor Track Message Size Interceptor using |.
13:29:36,772 INFO [com.vaadin.cdi.internal.BeanStoreContainer] (default task-5) New BeanStoreContainer created
13:29:37,685 ERROR [stderr] (default task-10) Kooo
13:29:37,688 SEVERE [com.vaadin.server.DefaultErrorHandler] (default task-10) : com.vaadin.server.ServerRpcManager$RpcInvocationException: Unable to invoke method click in com.vaadin.shared.ui.button.ButtonServerRpc
at com.vaadin.server.ServerRpcManager.applyInvocation(ServerRpcManager.java:170) [vaadin-server-7.1.12.jar:7.1.12]
at com.vaadin.server.ServerRpcManager.applyInvocation(ServerRpcManager.java:118) [vaadin-server-7.1.12.jar:7.1.12]
at com.vaadin.server.communication.ServerRpcHandler.handleBurst(ServerRpcHandler.java:207) [vaadin-server-7.1.12.jar:7.1.12]
at com.vaadin.server.communication.ServerRpcHandler.handleRpc(ServerRpcHandler.java:111) [vaadin-server-7.1.12.jar:7.1.12]
at com.vaadin.server.communication.UidlRequestHandler.synchronizedHandleRequest(UidlRequestHandler.java:91) [vaadin-server-7.1.12.jar:7.1.12]
at com.vaadin.server.SynchronizedRequestHandler.handleRequest(SynchronizedRequestHandler.java:37) [vaadin-server-7.1.12.jar:7.1.12]
at com.vaadin.server.VaadinService.handleRequest(VaadinService.java:1382) [vaadin-server-7.1.12.jar:7.1.12]
at com.vaadin.server.VaadinServlet.service(VaadinServlet.java:238) [vaadin-server-7.1.12.jar:7.1.12]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:790) [jboss-servlet-api_3.1_spec-1.0.0.Final.jar:1.0.0.Final]
at io.undertow.servlet.handlers.ServletHandler.handleRequest(ServletHandler.java:85) [undertow-servlet-1.0.0.Final.jar:1.0.0.Final]
at io.undertow.servlet.handlers.security.ServletSecurityRoleHandler.handleRequest(ServletSecurityRoleHandler.java:61) [undertow-servlet-1.0.0.Final.jar:1.0.0.Final]
at io.undertow.servlet.handlers.ServletDispatchingHandler.handleRequest(ServletDispatchingHandler.java:36) [undertow-servlet-1.0.0.Final.jar:1.0.0.Final]
at org.wildfly.extension.undertow.security.SecurityContextAssociationHandler.handleRequest(SecurityContextAssociationHandler.java:78)
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:25) [undertow-core-1.0.0.Final.jar:1.0.0.Final]
at io.undertow.servlet.handlers.security.SSLInformationAssociationHandler.handleRequest(SSLInformationAssociationHandler.java:113) [undertow-servlet-1.0.0.Final.jar:1.0.0.Final]
at io.undertow.security.handlers.AuthenticationCallHandler.handleRequest(AuthenticationCallHandler.java:52) [undertow-core-1.0.0.Final.jar:1.0.0.Final]
at io.undertow.security.handlers.AbstractConfidentialityHandler.handleRequest(AbstractConfidentialityHandler.java:45) [undertow-core-1.0.0.Final.jar:1.0.0.Final]
at io.undertow.servlet.handlers.security.ServletConfidentialityConstraintHandler.handleRequest(ServletConfidentialityConstraintHandler.java:61) [undertow-servlet-1.0.0.Final.jar:1.0.0.Final]
at io.undertow.servlet.handlers.security.CachedAuthenticatedSessionHandler.handleRequest(CachedAuthenticatedSessionHandler.java:70) [undertow-servlet-1.0.0.Final.jar:1.0.0.Final]
at io.undertow.security.handlers.SecurityInitialHandler.handleRequest(SecurityInitialHandler.java:76) [undertow-core-1.0.0.Final.jar:1.0.0.Final]
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:25) [undertow-core-1.0.0.Final.jar:1.0.0.Final]
at org.wildfly.extension.undertow.security.jacc.JACCContextIdHandler.handleRequest(JACCContextIdHandler.java:61)
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:25) [undertow-core-1.0.0.Final.jar:1.0.0.Final]
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:25) [undertow-core-1.0.0.Final.jar:1.0.0.Final]
at io.undertow.servlet.handlers.ServletInitialHandler.handleFirstRequest(ServletInitialHandler.java:240) [undertow-servlet-1.0.0.Final.jar:1.0.0.Final]
at io.undertow.servlet.handlers.ServletInitialHandler.dispatchRequest(ServletInitialHandler.java:227) [undertow-servlet-1.0.0.Final.jar:1.0.0.Final]
at io.undertow.servlet.handlers.ServletInitialHandler.access$000(ServletInitialHandler.java:73) [undertow-servlet-1.0.0.Final.jar:1.0.0.Final]
at io.undertow.servlet.handlers.ServletInitialHandler$1.handleRequest(ServletInitialHandler.java:146) [undertow-servlet-1.0.0.Final.jar:1.0.0.Final]
at io.undertow.server.Connectors.executeRootHandler(Connectors.java:168) [undertow-core-1.0.0.Final.jar:1.0.0.Final]
at io.undertow.server.HttpServerExchange$1.run(HttpServerExchange.java:687) [undertow-core-1.0.0.Final.jar:1.0.0.Final]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [rt.jar:1.8.0]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [rt.jar:1.8.0]
at java.lang.Thread.run(Thread.java:744) [rt.jar:1.8.0]
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) [rt.jar:1.8.0]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) [rt.jar:1.8.0]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) [rt.jar:1.8.0]
at java.lang.reflect.Method.invoke(Method.java:483) [rt.jar:1.8.0]
at com.vaadin.server.ServerRpcManager.applyInvocation(ServerRpcManager.java:168) [vaadin-server-7.1.12.jar:7.1.12]
... 32 more
Caused by: com.vaadin.event.ListenerMethod$MethodException: Invocation of method buttonClick in com.xy.zzy.MyCompositeEvents$1 failed.
at com.vaadin.event.ListenerMethod.receiveEvent(ListenerMethod.java:528) [vaadin-server-7.1.12.jar:7.1.12]
at com.vaadin.event.EventRouter.fireEvent(EventRouter.java:198) [vaadin-server-7.1.12.jar:7.1.12]
at com.vaadin.event.EventRouter.fireEvent(EventRouter.java:161) [vaadin-server-7.1.12.jar:7.1.12]
at com.vaadin.server.AbstractClientConnector.fireEvent(AbstractClientConnector.java:969) [vaadin-server-7.1.12.jar:7.1.12]
at com.vaadin.ui.Button.fireClick(Button.java:368) [vaadin-server-7.1.12.jar:7.1.12]
at com.vaadin.ui.Button$1.click(Button.java:57) [vaadin-server-7.1.12.jar:7.1.12]
... 37 more
Caused by: java.lang.NullPointerException
at com.xy.zzy.MyCompositeEvents$1.buttonClick(MyCompositeEvents.java:21) [classes:]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) [rt.jar:1.8.0]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) [rt.jar:1.8.0]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) [rt.jar:1.8.0]
at java.lang.reflect.Method.invoke(Method.java:483) [rt.jar:1.8.0]
at com.vaadin.event.ListenerMethod.receiveEvent(ListenerMethod.java:508) [vaadin-server-7.1.12.jar:7.1.12]
... 42 more
SOLUTION：
發現了另一種答案是把我在正確的軌道上：Vaadin: CDI Inject is null after referencing
我只是需要注入我的gui組件以及ejb，而不是用新創建它。
更改
@Override
protected void init(VaadinRequest request) {
setContent(new MyCompositeEvents());
}
到
@Inject MyComopsiteEvents mce;
@Override
protected void init(VaadinRequest request) {
setContent(mce);
}
的伎倆。 Noob-問題，我猜，但這是我第一次嘗試與vaadin一起使用cdi。
看來我不能回答我的問題，可以隨意複製到這個答案，張貼:-)
這是一個很長的問題！也許你可以將問題縮小到一個更具體的代碼和日誌輸出？ – amoebe
不是真的，那就是爲什麼我需要幫助......我不知道什麼是相關的，什麼不在這裏。很顯然，調用pingu.ping（）之後的NPE觸發了整個問題，但這很明顯。編輯：Thanx的格式，順便說一句！ –
我可能會補充說我已經嘗試將會話bean放入Web項目中，並且不包括服務項目表單依賴項，但是我得到了相同的NPE。 –