HotSwapAgent 可以重新加载 bean 字段以在 JSF 中使用吗？

Question

我已经根据此快速入门指南安装了热插拔代理 http://hotswapagent.org/mydoc_quickstart-jdk11.html

在服务器 Wildfly 上运行 JSF。具有多个模块的 Web 应用程序。

我注意到，当我向像 LoginBean hotswap 这样的 bean 添加字段时，它会检测到它并重新加载，但是当我尝试在 .xhtml 页面中使用新字段时，它会显示“没有该属性”。

Bean 更改：

public class LoginBean extends BasePage{
    
    private LoginManager loginManager;
    
    private int countLogins; // Added during runtime

    @PostConstruct
    public void init(){
        try{
            this.countLogins = loginManager.getAll().size(); // Added during runtime
            System.out.println(" countLogins " + getCountLogins()); // Added during runtime
        }catch(Exception e){
            e.printStackTrace();
        }
    }

    // Added during runtime
    public int getCountLogins() {
        return countLogins;
    }

    // Added during runtime
    public void setCountLogins(int countLogins) {
        this.countLogins = countLogins;
    }

    public LoginManager getLoginManager() {
        return loginManager;
    }

    public void setLoginManager(LoginManager loginManager) {
        this.loginManager = loginManager;
    }
}

.xhtml 更改：

logins : #{loginBean.countLogins}  <br />

错误：

13:35:32,717 SEVERE [org.primefaces.application.exceptionhandler.PrimeExceptionHandler] (default task-1) /index.xhtml: The class 'com.paem.baseproj.web.user.LoginBean' does not have the property 'countLogins'.: javax.el.ELException: /index.xhtml: The class 'com.paem.baseproj.web.user.LoginBean' does not have the property 'countLogins'.
    at [email protected]//com.sun.faces.facelets.compiler.TextInstruction.write(TextInstruction.java:47)
    at [email protected]//com.sun.faces.facelets.compiler.UIInstructions.encodeBegin(UIInstructions.java:41)
    at [email protected]//com.sun.faces.facelets.compiler.UILeaf.encodeAll(UILeaf.java:169)
    at [email protected]//javax.faces.component.UIComponent.encodeAll(UIComponent.java:1650)
    at [email protected]//com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:468)
    at [email protected]//com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:170)
    at [email protected]//javax.faces.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:132)
    at [email protected]//javax.faces.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:132)
    at [email protected]//javax.faces.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:132)
    at deployment.BaseProjectWeb-1.0.war//org.omnifaces.viewhandler.OmniViewHandler.renderView(OmniViewHandler.java:151)
    at [email protected]//com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:102)
    at [email protected]//com.sun.faces.lifecycle.Phase.doPhase(Phase.java:76)
    at [email protected]//com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:199)
    at [email protected]//javax.faces.webapp.FacesServlet.executeLifecyle(FacesServlet.java:708)
    at [email protected]//javax.faces.webapp.FacesServlet.service(FacesServlet.java:451)
    at [email protected]//io.undertow.servlet.handlers.ServletHandler.handleRequest(ServletHandler.java:74)
    at [email protected]//io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:129)
    at io.opentracing.contrib.opentracing-jaxrs2//io.opentracing.contrib.jaxrs2.server.SpanFinishingFilter.doFilter(SpanFinishingFilter.java:52)
    at [email protected]//io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61)
    at [email protected]//io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)
    at [email protected]//io.undertow.servlet.handlers.FilterHandler.handleRequest(FilterHandler.java:84)
    at [email protected]//io.undertow.servlet.handlers.security.ServletSecurityRoleHandler.handleRequest(ServletSecurityRoleHandler.java:62)
    at [email protected]//io.undertow.servlet.handlers.ServletChain$1.handleRequest(ServletChain.java:68)
    at [email protected]//io.undertow.servlet.handlers.ServletDispatchingHandler.handleRequest(ServletDispatchingHandler.java:36)
    at [email protected]//org.wildfly.extension.undertow.security.SecurityContextAssociationHandler.handleRequest(SecurityContextAssociationHandler.java:78)
    at [email protected]//io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
    at [email protected]//io.undertow.servlet.handlers.RedirectDirHandler.handleRequest(RedirectDirHandler.java:68)
    at [email protected]//io.undertow.servlet.handlers.security.SSLInformationAssociationHandler.handleRequest(SSLInformationAssociationHandler.java:117)
    at [email protected]//io.undertow.servlet.handlers.security.ServletAuthenticationCallHandler.handleRequest(ServletAuthenticationCallHandler.java:57)
    at [email protected]//io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
    at [email protected]//io.undertow.security.handlers.AbstractConfidentialityHandler.handleRequest(AbstractConfidentialityHandler.java:46)
    at [email protected]//io.undertow.servlet.handlers.security.ServletConfidentialityConstraintHandler.handleRequest(ServletConfidentialityConstraintHandler.java:64)
    at [email protected]//io.undertow.security.handlers.AuthenticationMechanismsHandler.handleRequest(AuthenticationMechanismsHandler.java:60)
    at [email protected]//io.undertow.servlet.handlers.security.CachedAuthenticatedSessionHandler.handleRequest(CachedAuthenticatedSessionHandler.java:77)
    at [email protected]//io.undertow.security.handlers.NotificationReceiverHandler.handleRequest(NotificationReceiverHandler.java:50)
    at [email protected]//io.undertow.security.handlers.AbstractSecurityContextAssociationHandler.handleRequest(AbstractSecurityContextAssociationHandler.java:43)
    at [email protected]//io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
    at [email protected]//org.wildfly.extension.undertow.security.jacc.JACCContextIdHandler.handleRequest(JACCContextIdHandler.java:61)
    at [email protected]//io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
    at [email protected]//org.wildfly.extension.undertow.deployment.GlobalRequestControllerHandler.handleRequest(GlobalRequestControllerHandler.java:68)
    at [email protected]//io.undertow.servlet.handlers.SendErrorPageHandler.handleRequest(SendErrorPageHandler.java:52)
    at [email protected]//io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
    at [email protected]//io.undertow.servlet.handlers.ServletInitialHandler.handleFirstRequest(ServletInitialHandler.java:269)
    at [email protected]//io.undertow.servlet.handlers.ServletInitialHandler.access$100(ServletInitialHandler.java:78)
    at [email protected]//io.undertow.servlet.handlers.ServletInitialHandler$2.call(ServletInitialHandler.java:133)
    at [email protected]//io.undertow.servlet.handlers.ServletInitialHandler$2.call(ServletInitialHandler.java:130)
    at [email protected]//io.undertow.servlet.core.ServletRequestContextThreadSetupAction$1.call(ServletRequestContextThreadSetupAction.java:48)
    at [email protected]//io.undertow.servlet.core.ContextClassLoaderSetupAction$1.call(ContextClassLoaderSetupAction.java:43)
    at [email protected]//org.wildfly.extension.undertow.security.SecurityContextThreadSetupAction.lambda$create$0(SecurityContextThreadSetupAction.java:105)
    at [email protected]//org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymentInfoService.java:1535)
    at [email protected]//org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymentInfoService.java:1535)
    at [email protected]//org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymentInfoService.java:1535)
    at [email protected]//org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymentInfoService.java:1535)
    at [email protected]//org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymentInfoService.java:1535)
    at [email protected]//io.undertow.servlet.handlers.ServletInitialHandler.dispatchRequest(ServletInitialHandler.java:249)
    at [email protected]//io.undertow.servlet.handlers.ServletInitialHandler.access$000(ServletInitialHandler.java:78)
    at [email protected]//io.undertow.servlet.handlers.ServletInitialHandler$1.handleRequest(ServletInitialHandler.java:99)
    at [email protected]//io.undertow.server.Connectors.executeRootHandler(Connectors.java:387)
    at [email protected]//io.undertow.server.HttpServerExchange$1.run(HttpServerExchange.java:841)
    at [email protected]//org.jboss.threads.ContextClassLoaderSavingRunnable.run(ContextClassLoaderSavingRunnable.java:35)
    at [email protected]//org.jboss.threads.EnhancedQueueExecutor.safeRun(EnhancedQueueExecutor.java:1990)
    at [email protected]//org.jboss.threads.EnhancedQueueExecutor$ThreadBody.doRunTask(EnhancedQueueExecutor.java:1486)
    at [email protected]//org.jboss.threads.EnhancedQueueExecutor$ThreadBody.run(EnhancedQueueExecutor.java:1377)
    at [email protected]//org.xnio.XnioWorker$WorkerThreadFactory$1$1.run(XnioWorker.java:1280)
    at java.base/java.lang.Thread.run(Thread.java:829)

如果我构建并部署 Web 应用程序，它就会开始工作。