我尝试使用CDI在需要时注入firefox（避免总是配置驱动程序）。但我总是得到NullPointer。
我为firefox驱动程序
创建了生成器@ApplicationScoped
public class FirefoxDriverProducer {
@Produces @RequestScoped
public FirefoxDriver getDriver() {
// Inicia o Firefox pelo Selenium
String caminhoFirefox = "/usr/bin/firefox";
String profileFirefox = "Selenium";
// Aponta o caminho para o firefox
File pathToBinary = new File(caminhoFirefox);
FirefoxBinary ffBinary = new FirefoxBinary(pathToBinary);
// Profile que precisa ser criado no firefox
ProfilesIni profile = new ProfilesIni();
FirefoxProfile myprofile = profile.getProfile(profileFirefox);
// Proxy
String PROXY = "companyproxy:8080";
org.openqa.selenium.Proxy proxy = new org.openqa.selenium.Proxy();
proxy.setHttpProxy(PROXY).setFtpProxy(PROXY).setSslProxy(PROXY);
DesiredCapabilities cap = new DesiredCapabilities();
cap.setCapability(CapabilityType.PROXY, proxy);
FirefoxDriver driver = new FirefoxDriver(ffBinary, myprofile, cap);
return driver;
}
public void close(@Disposes FirefoxDriver driver) {
driver.quit();
}
}
当我想使用它时，我称之为：
@Inject
private FirefoxDriver driver;
像我想注入的任何其他物体一样。
但我总是得到NullPointer，当我尝试调试驱动程序时，它始终为null，通过在生成器方法getDriver()中放置一个断点，它甚至不被调用。
在同一项目中我已经做过类似的事情，FacesContext和NavigationHandler，他们都运作良好。
ps：我正在运行Wildfly 8，beans.xml在我的网络上。
ps2：我之所以这样做是因为我需要访问另一家公司网站并不时下载一些信息，因为他们不提供任何网络服务或其他任何信息，只能通过网络浏览器。
ps3：如果我不使用CDI并从制作人处获取所有代码并将其放在课堂上，我就可以调用它。所以我假设它不是Selenium的问题
堆栈跟踪器：
16:48:29,632 WARNING [javax.enterprise.resource.webcontainer.jsf.lifecycle] (default task-43) #{testeBean.teste()}: java.lang.NullPointerException: javax.faces.FacesException: #{testeBean.teste()}: java.lang.NullPointerException
at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:118) [jsf-impl-2.2.8-jbossorg-1.jar:]
at javax.faces.component.UICommand.broadcast(UICommand.java:315) [jboss-jsf-api_2.2_spec-2.2.8.jar:2.2.8]
at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:790) [jboss-jsf-api_2.2_spec-2.2.8.jar:2.2.8]
at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1282) [jboss-jsf-api_2.2_spec-2.2.8.jar:2.2.8]
at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:81) [jsf-impl-2.2.8-jbossorg-1.jar:]
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101) [jsf-impl-2.2.8-jbossorg-1.jar:]
at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:198) [jsf-impl-2.2.8-jbossorg-1.jar:]
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:646) [jboss-jsf-api_2.2_spec-2.2.8.jar:2.2.8]
at io.undertow.servlet.handlers.ServletHandler.handleRequest(ServletHandler.java:85) [undertow-servlet-1.1.0.Final.jar:1.1.0.Final]
at io.undertow.servlet.handlers.security.ServletSecurityRoleHandler.handleRequest(ServletSecurityRoleHandler.java:61) [undertow-servlet-1.1.0.Final.jar:1.1.0.Final]
at io.undertow.servlet.handlers.ServletDispatchingHandler.handleRequest(ServletDispatchingHandler.java:36) [undertow-servlet-1.1.0.Final.jar:1.1.0.Final]
at org.wildfly.extension.undertow.security.SecurityContextAssociationHandler.handleRequest(SecurityContextAssociationHandler.java:78)
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43) [undertow-core-1.1.0.Final.jar:1.1.0.Final]
at io.undertow.servlet.handlers.security.SSLInformationAssociationHandler.handleRequest(SSLInformationAssociationHandler.java:131) [undertow-servlet-1.1.0.Final.jar:1.1.0.Final]
at io.undertow.servlet.handlers.security.ServletAuthenticationCallHandler.handleRequest(ServletAuthenticationCallHandler.java:56) [undertow-servlet-1.1.0.Final.jar:1.1.0.Final]
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43) [undertow-core-1.1.0.Final.jar:1.1.0.Final]
at io.undertow.security.handlers.AbstractConfidentialityHandler.handleRequest(AbstractConfidentialityHandler.java:45) [undertow-core-1.1.0.Final.jar:1.1.0.Final]
at io.undertow.servlet.handlers.security.ServletConfidentialityConstraintHandler.handleRequest(ServletConfidentialityConstraintHandler.java:63) [undertow-servlet-1.1.0.Final.jar:1.1.0.Final]
at io.undertow.security.handlers.AuthenticationMechanismsHandler.handleRequest(AuthenticationMechanismsHandler.java:58) [undertow-core-1.1.0.Final.jar:1.1.0.Final]
at io.undertow.servlet.handlers.security.CachedAuthenticatedSessionHandler.handleRequest(CachedAuthenticatedSessionHandler.java:70) [undertow-servlet-1.1.0.Final.jar:1.1.0.Final]
at io.undertow.security.handlers.SecurityInitialHandler.handleRequest(SecurityInitialHandler.java:76) [undertow-core-1.1.0.Final.jar:1.1.0.Final]
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43) [undertow-core-1.1.0.Final.jar:1.1.0.Final]
at org.wildfly.extension.undertow.security.jacc.JACCContextIdHandler.handleRequest(JACCContextIdHandler.java:61)
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43) [undertow-core-1.1.0.Final.jar:1.1.0.Final]
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43) [undertow-core-1.1.0.Final.jar:1.1.0.Final]
at io.undertow.servlet.handlers.ServletInitialHandler.handleFirstRequest(ServletInitialHandler.java:261) [undertow-servlet-1.1.0.Final.jar:1.1.0.Final]
at io.undertow.servlet.handlers.ServletInitialHandler.dispatchRequest(ServletInitialHandler.java:247) [undertow-servlet-1.1.0.Final.jar:1.1.0.Final]
at io.undertow.servlet.handlers.ServletInitialHandler.access$000(ServletInitialHandler.java:76) [undertow-servlet-1.1.0.Final.jar:1.1.0.Final]
at io.undertow.servlet.handlers.ServletInitialHandler$1.handleRequest(ServletInitialHandler.java:166) [undertow-servlet-1.1.0.Final.jar:1.1.0.Final]
at io.undertow.server.Connectors.executeRootHandler(Connectors.java:197) [undertow-core-1.1.0.Final.jar:1.1.0.Final]
at io.undertow.server.HttpServerExchange$1.run(HttpServerExchange.java:759) [undertow-core-1.1.0.Final.jar:1.1.0.Final]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [rt.jar:1.8.0_25]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [rt.jar:1.8.0_25]
at java.lang.Thread.run(Thread.java:745) [rt.jar:1.8.0_25]
Caused by: javax.faces.el.EvaluationException: java.lang.NullPointerException
at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:101) [jboss-jsf-api_2.2_spec-2.2.8.jar:2.2.8]
at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:102) [jsf-impl-2.2.8-jbossorg-1.jar:]
... 33 more
Caused by: java.lang.NullPointerException
at br.com.timbrasil.bluemonster.csr.DownloadCsr.<init>(DownloadCsr.java:49) [classes:]
at br.com.timbrasil.bluemonster.csr.TesteBean.teste(TesteBean.java:24) [classes:]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) [rt.jar:1.8.0_25]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) [rt.jar:1.8.0_25]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) [rt.jar:1.8.0_25]
at java.lang.reflect.Method.invoke(Method.java:483) [rt.jar:1.8.0_25]
at javax.el.ELUtil.invokeMethod(ELUtil.java:308) [jboss-el-api_3.0_spec-1.0.3.Final.jar:1.0.3.Final]
at javax.el.BeanELResolver.invoke(BeanELResolver.java:537) [jboss-el-api_3.0_spec-1.0.3.Final.jar:1.0.3.Final]
at javax.el.CompositeELResolver.invoke(CompositeELResolver.java:256) [jboss-el-api_3.0_spec-1.0.3.Final.jar:1.0.3.Final]
at com.sun.el.parser.AstValue.invoke(AstValue.java:286) [javax.el-3.0.1-b05.jar:]
at com.sun.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:304) [javax.el-3.0.1-b05.jar:]
at org.jboss.weld.util.el.ForwardingMethodExpression.invoke(ForwardingMethodExpression.java:40) [weld-core-impl-2.2.6.Final.jar:2014-10-03 10:05]
at org.jboss.weld.el.WeldMethodExpression.invoke(WeldMethodExpression.java:50) [weld-core-impl-2.2.6.Final.jar:2014-10-03 10:05]
at org.jboss.weld.util.el.ForwardingMethodExpression.invoke(ForwardingMethodExpression.java:40) [weld-core-impl-2.2.6.Final.jar:2014-10-03 10:05]
at org.jboss.weld.el.WeldMethodExpression.invoke(WeldMethodExpression.java:50) [weld-core-impl-2.2.6.Final.jar:2014-10-03 10:05]
at com.sun.faces.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:105) [jsf-impl-2.2.8-jbossorg-1.jar:]
at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:87) [jboss-jsf-api_2.2_spec-2.2.8.jar:2.2.8]
... 34 more
16:48:29,642 SEVERE [javax.enterprise.resource.webcontainer.jsf.context] (default task-43) javax.faces.el.EvaluationException: java.lang.NullPointerException
at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:101)
at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:102)
at javax.faces.component.UICommand.broadcast(UICommand.java:315)
at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:790)
at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1282)
at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:81)
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:198)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:646)
at io.undertow.servlet.handlers.ServletHandler.handleRequest(ServletHandler.java:85)
at io.undertow.servlet.handlers.security.ServletSecurityRoleHandler.handleRequest(ServletSecurityRoleHandler.java:61)
at io.undertow.servlet.handlers.ServletDispatchingHandler.handleRequest(ServletDispatchingHandler.java:36)
at org.wildfly.extension.undertow.security.SecurityContextAssociationHandler.handleRequest(SecurityContextAssociationHandler.java:78)
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
at io.undertow.servlet.handlers.security.SSLInformationAssociationHandler.handleRequest(SSLInformationAssociationHandler.java:131)
at io.undertow.servlet.handlers.security.ServletAuthenticationCallHandler.handleRequest(ServletAuthenticationCallHandler.java:56)
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
at io.undertow.security.handlers.AbstractConfidentialityHandler.handleRequest(AbstractConfidentialityHandler.java:45)
at io.undertow.servlet.handlers.security.ServletConfidentialityConstraintHandler.handleRequest(ServletConfidentialityConstraintHandler.java:63)
at io.undertow.security.handlers.AuthenticationMechanismsHandler.handleRequest(AuthenticationMechanismsHandler.java:58)
at io.undertow.servlet.handlers.security.CachedAuthenticatedSessionHandler.handleRequest(CachedAuthenticatedSessionHandler.java:70)
at io.undertow.security.handlers.SecurityInitialHandler.handleRequest(SecurityInitialHandler.java:76)
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
at org.wildfly.extension.undertow.security.jacc.JACCContextIdHandler.handleRequest(JACCContextIdHandler.java:61)
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
at io.undertow.servlet.handlers.ServletInitialHandler.handleFirstRequest(ServletInitialHandler.java:261)
at io.undertow.servlet.handlers.ServletInitialHandler.dispatchRequest(ServletInitialHandler.java:247)
at io.undertow.servlet.handlers.ServletInitialHandler.access$000(ServletInitialHandler.java:76)
at io.undertow.servlet.handlers.ServletInitialHandler$1.handleRequest(ServletInitialHandler.java:166)
at io.undertow.server.Connectors.executeRootHandler(Connectors.java:197)
at io.undertow.server.HttpServerExchange$1.run(HttpServerExchange.java:759)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.NullPointerException
at br.com.timbrasil.bluemonster.csr.DownloadCsr.<init>(DownloadCsr.java:49)
at br.com.timbrasil.bluemonster.csr.TesteBean.teste(TesteBean.java:24)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at javax.el.ELUtil.invokeMethod(ELUtil.java:308)
at javax.el.BeanELResolver.invoke(BeanELResolver.java:537)
at javax.el.CompositeELResolver.invoke(CompositeELResolver.java:256)
at com.sun.el.parser.AstValue.invoke(AstValue.java:286)
at com.sun.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:304)
at org.jboss.weld.util.el.ForwardingMethodExpression.invoke(ForwardingMethodExpression.java:40)
at org.jboss.weld.el.WeldMethodExpression.invoke(WeldMethodExpression.java:50)
at org.jboss.weld.util.el.ForwardingMethodExpression.invoke(ForwardingMethodExpression.java:40)
at org.jboss.weld.el.WeldMethodExpression.invoke(WeldMethodExpression.java:50)
at com.sun.faces.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:105)
at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:87)
... 34 more
@Edit
我的Download课程，我注入了FireFoxDriver：
public class DownloadCsr {
@Inject
private FirefoxDriver driver;
public DownloadCsr(String usuario, String senha, LocalDateTime dataInicial,
LocalDateTime dataFinal) throws LoginException {
driver.get("https://companysite.net");
// Encontra o elemento para inserir o usuario
WebElement webUsuario = getElementByLocator(By.name("USER"), driver);
// Insere o usuario
webUsuario.sendKeys(usuario);
// Encontra o elemento para inserir a senha
WebElement webSenha = getElementByLocator(By.name("PASSWORD"), driver);
// Insere a senha
webSenha.sendKeys(senha);
// Acha o bot�o de login e clica
WebElement button = getElementByLocator(By.name("IMAGE1"), driver);
button.click();
// Confere se logou na pagina verificando o titulo dela, do contrario
// lança a exceção
if (!driver.getTitle().equals("Business Home")) {
throw new LoginException("Can't reach the loged-in page");
}
}
使用以下内容进行测试。
@Named
@RequestScoped
public class TesteBean implements Serializable {
public void teste() {
LocalDateTime dataInicial = LocalDateTime.now().minusDays(1);
LocalDateTime dataFinal = LocalDateTime.now();
try {
new DownloadCsr("login", "password",
dataInicial, dataFinal);
} catch (LoginException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
答案 0 :(得分：2)
你的问题来自于DownloadCsr不是bean的事实。它有一个带参数的构造函数，您可以在类TesteBean中实例化它。要获得CDI功能，您必须让CDI容器为您实例化bean，并提供所有需要的信息作为其他可注入bean。换句话说：使用new会给你一个非托管的未注入的实例。
将业务代码放在构造函数中也是一种不好的做法。构造函数应该只包含初始化代码。在构造函数期间，没有任何字段被注入，所以即使你的DownloadCsr满足要求为bean，你的构造函数中也会有NPE。
你能做的就是这样：
@Named
@RequestScoped
public class TesteBean implements Serializable {
@Inject
private DownloadCsr dcsr;
public void teste() {
LocalDateTime dataInicial = LocalDateTime.now().minusDays(1);
LocalDateTime dataFinal = LocalDateTime.now();
try {
dcsr.crawl("login","password", dataInicial, dataFinal);
} catch (LoginException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
使用以下DownloadCsr
public class DownloadCsr {
@Inject
private FirefoxDriver driver;
public void crawl(String usuario, String senha, LocalDateTime dataInicial,
LocalDateTime dataFinal) throws LoginException {
driver.get("https://companysite.net");
// Encontra o elemento para inserir o usuario
WebElement webUsuario = getElementByLocator(By.name("USER"), driver);
// Insere o usuario
webUsuario.sendKeys(usuario);
// Encontra o elemento para inserir a senha
WebElement webSenha = getElementByLocator(By.name("PASSWORD"), driver);
// Insere a senha
webSenha.sendKeys(senha);
// Acha o boto de login e clica
WebElement button = getElementByLocator(By.name("IMAGE1"), driver);
button.click();
// Confere se logou na pagina verificando o titulo dela, do contrario
// lança a exceção
if (!driver.getTitle().equals("Business Home")) {
throw new LoginException("Can't reach the loged-in page");
}
}
}