注入 bean returns null Java YES
Injection of bean returns null Java EE 8
我问过类似的问题，但答案不是关于注入问题，所以我在将容器从 Tomcat 更改为 Wildfly 后再次遇到这个问题。
我在我的应用程序中使用命令模式，当我使用 command="signin".
我有下一个类:
CommandEnum.java
public enum CommandEnum {
EMPTY_COMMAND {
{
this.command = emptyCommand;
}
},
NAME_GENERATION {
{
this.command = nameGenerationCommand;
}
},
NAME_GENERATION_SETTINGS {
{
this.command = nameGenerationSettingsCommand;
}
},
SIGNIN {
{
this.command = signinCommand; // is it possible?
}
};
@Inject
@EmptyCommandQualifier
Command command;
@Inject
EmptyCommand emptyCommand;
@Inject
NameGenerationCommand nameGenerationCommand;
@Inject
NameGenerationSettingsCommand nameGenerationSettingsCommand;
@Inject
SigninCommand signinCommand;
public Command getCommand() {
return command;
}
}
Command.java
public interface Command {
public String execute(HttpServletRequest request, HttpServletResponse response) throws IOException;
}
ActionFactory.java
public class ActionFactory {
@Inject
@EmptyCommandQualifier
private Command command;
@Inject
private CommandEnum commandEnum;
public Command defineCommand(String action) throws IllegalArgumentException {
if (action == null || action.isEmpty()) {
return command;
}
commandEnum = CommandEnum.valueOf(action.toUpperCase());
System.out.println(command.toString()) // returns EmtpyCommand object
command = commandEnum.getCommand();
System.out.println(commandEnum.toString()); // returns SIGNIN
System.out.println(command.toString()); //line 28
return command;
}
@Produces
public static CommandEnum getEmptyCommandEnum()
{
return CommandEnum.EMPTY_COMMAND;
}
}
登录Command.java
@SigninCommandQualifier
public class SigninCommand implements Command {
@Inject
private UserEJB userEJB;
public String execute(HttpServletRequest request, HttpServletResponse response) throws IOException {
String password = request.getParameter("password");
String email = request.getParameter("email");
User signinUser = new User(email, password);
User foundUser = userEJB.findUser(signinUser);
if (foundUser != null) {
request.setAttribute("passedAuth", true);
return PagesManager.getProperty("page.nameGeneration");
} else {
request.setAttribute("passedAuth", false);
return PagesManager.getProperty("page.signin");
}
}
}
空Command.java
@EmptyCommandQualifier
public class EmptyCommand implements Command {
@Override
public String execute(HttpServletRequest request, HttpServletResponse response) {
return null;
}
}
CreativityServlet.java
public class CreativityServlet extends HttpServlet {
@Inject
@EmptyCommandQualifier
private Command command;
@Inject
private ActionFactory actionFactory;
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
processRequest(request, response);
}
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
processRequest(request, response);
}
private void processRequest(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException{
String action = request.getParameter("command");
try {
command = actionFactory.defineCommand(action);
} catch (IllegalArgumentException e) {
request.setAttribute("msg", action + " " + MessageManager.getProperty("message.wrongaction"));
}
String page;
try {
page = command.execute(request, response);
} catch (IOException e) {
page = PagesManager.getProperty("page.error");
}
if (page != null) {
if (page.equals("not redirecting")) {
return;
}
RequestDispatcher dispatcher = getServletContext().getRequestDispatcher(page);
dispatcher.forward(request, response);
} else {
page = PagesManager.getProperty("page.index");
request.getSession().setAttribute("nullPage",
MessageManager.getProperty("message.nullpage"));
response.sendRedirect(request.getContextPath() + page);
}
}
}
预选赛：
EmptyCommandQualifier.java
@Qualifier
@Retention(RUNTIME)
@Target({FIELD, TYPE, METHOD})
public @interface EmptyCommandQualifier {
}
SigninCommandQualifier.java
@Qualifier
@Retention(RUNTIME)
@Target({FIELD, TYPE, METHOD})
public @interface SigninCommandQualifier {
}
web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://java.sun.com/xml/ns/javaee"
xsi:schemaLocation=
"http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
id="WebApp_ID" version="2.5">
<display-name>creativity</display-name>
<servlet>
<servlet-name>Controller</servlet-name>
<servlet-class>com.creativity.servlet.CreativityServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>Controller</servlet-name>
<url-pattern>/creativity</url-pattern>
</servlet-mapping>
<servlet>
<servlet-name>NameGenerator</servlet-name>
<servlet-class>com.creativity.servlet.GenerateNameServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>NameGenerator</servlet-name>
<url-pattern>/generateName</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
</web-app>
我捕获了下一个异常：
22:16:14,147 ERROR [io.undertow.request] (default task-1) UT005023: Exception handling request to /creativity: java.lang.NullPointerException
at factory.ActionFactory.defineCommand(ActionFactory.java:28)
at com.creativity.servlet.CreativityServlet.processRequest(CreativityServlet.java:39)
at com.creativity.servlet.CreativityServlet.doPost(CreativityServlet.java:33)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:523)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:590)
at io.undertow.servlet.handlers.ServletHandler.handleRequest(ServletHandler.java:74)
at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:129)
at io.opentracing.contrib.jaxrs2.server.SpanFinishingFilter.doFilter(SpanFinishingFilter.java:52)
at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61)
at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)
at io.undertow.servlet.handlers.FilterHandler.handleRequest(FilterHandler.java:84)
at io.undertow.servlet.handlers.security.ServletSecurityRoleHandler.handleRequest(ServletSecurityRoleHandler.java:62)
at io.undertow.servlet.handlers.ServletChain.handleRequest(ServletChain.java:68)
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.RedirectDirHandler.handleRequest(RedirectDirHandler.java:68)
at io.undertow.servlet.handlers.security.SSLInformationAssociationHandler.handleRequest(SSLInformationAssociationHandler.java:117)
at io.undertow.servlet.handlers.security.ServletAuthenticationCallHandler.handleRequest(ServletAuthenticationCallHandler.java:57)
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
at io.undertow.security.handlers.AbstractConfidentialityHandler.handleRequest(AbstractConfidentialityHandler.java:46)
at io.undertow.servlet.handlers.security.ServletConfidentialityConstraintHandler.handleRequest(ServletConfidentialityConstraintHandler.java:64)
at io.undertow.security.handlers.AuthenticationMechanismsHandler.handleRequest(AuthenticationMechanismsHandler.java:60)
at io.undertow.servlet.handlers.security.CachedAuthenticatedSessionHandler.handleRequest(CachedAuthenticatedSessionHandler.java:77)
at io.undertow.security.handlers.NotificationReceiverHandler.handleRequest(NotificationReceiverHandler.java:50)
at io.undertow.security.handlers.AbstractSecurityContextAssociationHandler.handleRequest(AbstractSecurityContextAssociationHandler.java:43)
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 org.wildfly.extension.undertow.deployment.GlobalRequestControllerHandler.handleRequest(GlobalRequestControllerHandler.java:68)
at io.undertow.servlet.handlers.SendErrorPageHandler.handleRequest(SendErrorPageHandler.java:52)
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
at io.undertow.servlet.handlers.ServletInitialHandler.handleFirstRequest(ServletInitialHandler.java:269)
at io.undertow.servlet.handlers.ServletInitialHandler.access0(ServletInitialHandler.java:78)
at io.undertow.servlet.handlers.ServletInitialHandler.call(ServletInitialHandler.java:133)
at io.undertow.servlet.handlers.ServletInitialHandler.call(ServletInitialHandler.java:130)
at io.undertow.servlet.core.ServletRequestContextThreadSetupAction.call(ServletRequestContextThreadSetupAction.java:48)
at io.undertow.servlet.core.ContextClassLoaderSetupAction.call(ContextClassLoaderSetupAction.java:43)
at org.wildfly.extension.undertow.security.SecurityContextThreadSetupAction.lambda$create[=21=](SecurityContextThreadSetupAction.java:105)
at org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create[=21=](UndertowDeploymentInfoService.java:1530)
at org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create[=21=](UndertowDeploymentInfoService.java:1530)
at org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create[=21=](UndertowDeploymentInfoService.java:1530)
at org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create[=21=](UndertowDeploymentInfoService.java:1530)
at org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create[=21=](UndertowDeploymentInfoService.java:1530)
at io.undertow.servlet.handlers.ServletInitialHandler.dispatchRequest(ServletInitialHandler.java:249)
at io.undertow.servlet.handlers.ServletInitialHandler.access[=21=]0(ServletInitialHandler.java:78)
at io.undertow.servlet.handlers.ServletInitialHandler.handleRequest(ServletInitialHandler.java:99)
at io.undertow.server.Connectors.executeRootHandler(Connectors.java:387)
at io.undertow.server.HttpServerExchange.run(HttpServerExchange.java:841)
at org.jboss.threads.ContextClassLoaderSavingRunnable.run(ContextClassLoaderSavingRunnable.java:35)
at org.jboss.threads.EnhancedQueueExecutor.safeRun(EnhancedQueueExecutor.java:1990)
at org.jboss.threads.EnhancedQueueExecutor$ThreadBody.doRunTask(EnhancedQueueExecutor.java:1486)
at org.jboss.threads.EnhancedQueueExecutor$ThreadBody.run(EnhancedQueueExecutor.java:1348)
at org.xnio.XnioWorker$WorkerThreadFactory.run(XnioWorker.java:1280)
at java.lang.Thread.run(Thread.java:748)
我的 EAR 和 EJB 模块的 META-INF 文件夹以及 WAR 模块的 WEB-INF 文件夹中有 beans.xml。
问题的解决方法是什么？
感谢您的评论，正如 的评论中提到的，我知道枚举不是 CDI 管理的，因此注入 returns null。我处理它在 class 中声明枚举并根据切换条件声明 getter 返回命令。它看起来像下一个：
Commands.java
public class Commands {
public enum CommandEnum {
EMPTY_COMMAND,
NAME_GENERATION,
NAME_GENERATION_SETTINGS,
SIGNIN,
LOGOUT,
LANGUAGE_EDITOR_GET_CULTURES,
LANGUAGE_EDITOR_GET_DETAILS
}
@Inject
@EmptyCommandQualifier
EmptyCommand emptyCommand;
@Inject
@NameGenerationCommandQualifier
NameGenerationCommand nameGenerationCommand;
@Inject
@NameGenerationSettingsCommandQualifier
NameGenerationSettingsCommand nameGenerationSettingsCommand;
@Inject
@SigninCommandQualifier
SigninCommand signinCommand;
@Inject
@LogoutCommandQualifier
LogoutCommand logoutCommand;
@Inject
@LanguageEditorGetCulturesCommandQualifier
LanguageEditorGetCulturesCommand languageEditorGetCulturesCommand;
@Inject
@LanguageEditorGetLanguageDetailsCommandQualifier
LanguageEditorGetLanguageDetailsCommand languageEditorGetLanguageDetailsCommand;
public CommandEnum getCommandEnum(String action) {
return CommandEnum.valueOf(action.toUpperCase());
}
public Command getCommand(CommandEnum commandEnum) {
switch (commandEnum) {
case NAME_GENERATION: return nameGenerationCommand;
case NAME_GENERATION_SETTINGS: return nameGenerationSettingsCommand;
case SIGNIN: return signinCommand;
case LOGOUT: return logoutCommand;
case LANGUAGE_EDITOR_GET_CULTURES: return languageEditorGetCulturesCommand;
case LANGUAGE_EDITOR_GET_DETAILS: return languageEditorGetLanguageDetailsCommand;
default: return emptyCommand;
}
}
}
我问过类似的问题，但答案不是关于注入问题，所以我在将容器从 Tomcat 更改为 Wildfly 后再次遇到这个问题。
我在我的应用程序中使用命令模式，当我使用 command="signin".
我有下一个类:
CommandEnum.java
public enum CommandEnum {
EMPTY_COMMAND {
{
this.command = emptyCommand;
}
},
NAME_GENERATION {
{
this.command = nameGenerationCommand;
}
},
NAME_GENERATION_SETTINGS {
{
this.command = nameGenerationSettingsCommand;
}
},
SIGNIN {
{
this.command = signinCommand; // is it possible?
}
};
@Inject
@EmptyCommandQualifier
Command command;
@Inject
EmptyCommand emptyCommand;
@Inject
NameGenerationCommand nameGenerationCommand;
@Inject
NameGenerationSettingsCommand nameGenerationSettingsCommand;
@Inject
SigninCommand signinCommand;
public Command getCommand() {
return command;
}
}
Command.java
public interface Command {
public String execute(HttpServletRequest request, HttpServletResponse response) throws IOException;
}
ActionFactory.java
public class ActionFactory {
@Inject
@EmptyCommandQualifier
private Command command;
@Inject
private CommandEnum commandEnum;
public Command defineCommand(String action) throws IllegalArgumentException {
if (action == null || action.isEmpty()) {
return command;
}
commandEnum = CommandEnum.valueOf(action.toUpperCase());
System.out.println(command.toString()) // returns EmtpyCommand object
command = commandEnum.getCommand();
System.out.println(commandEnum.toString()); // returns SIGNIN
System.out.println(command.toString()); //line 28
return command;
}
@Produces
public static CommandEnum getEmptyCommandEnum()
{
return CommandEnum.EMPTY_COMMAND;
}
}
登录Command.java
@SigninCommandQualifier
public class SigninCommand implements Command {
@Inject
private UserEJB userEJB;
public String execute(HttpServletRequest request, HttpServletResponse response) throws IOException {
String password = request.getParameter("password");
String email = request.getParameter("email");
User signinUser = new User(email, password);
User foundUser = userEJB.findUser(signinUser);
if (foundUser != null) {
request.setAttribute("passedAuth", true);
return PagesManager.getProperty("page.nameGeneration");
} else {
request.setAttribute("passedAuth", false);
return PagesManager.getProperty("page.signin");
}
}
}
空Command.java
@EmptyCommandQualifier
public class EmptyCommand implements Command {
@Override
public String execute(HttpServletRequest request, HttpServletResponse response) {
return null;
}
}
CreativityServlet.java
public class CreativityServlet extends HttpServlet {
@Inject
@EmptyCommandQualifier
private Command command;
@Inject
private ActionFactory actionFactory;
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
processRequest(request, response);
}
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
processRequest(request, response);
}
private void processRequest(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException{
String action = request.getParameter("command");
try {
command = actionFactory.defineCommand(action);
} catch (IllegalArgumentException e) {
request.setAttribute("msg", action + " " + MessageManager.getProperty("message.wrongaction"));
}
String page;
try {
page = command.execute(request, response);
} catch (IOException e) {
page = PagesManager.getProperty("page.error");
}
if (page != null) {
if (page.equals("not redirecting")) {
return;
}
RequestDispatcher dispatcher = getServletContext().getRequestDispatcher(page);
dispatcher.forward(request, response);
} else {
page = PagesManager.getProperty("page.index");
request.getSession().setAttribute("nullPage",
MessageManager.getProperty("message.nullpage"));
response.sendRedirect(request.getContextPath() + page);
}
}
}
预选赛：
EmptyCommandQualifier.java
@Qualifier
@Retention(RUNTIME)
@Target({FIELD, TYPE, METHOD})
public @interface EmptyCommandQualifier {
}
SigninCommandQualifier.java
@Qualifier
@Retention(RUNTIME)
@Target({FIELD, TYPE, METHOD})
public @interface SigninCommandQualifier {
}
web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://java.sun.com/xml/ns/javaee"
xsi:schemaLocation=
"http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
id="WebApp_ID" version="2.5">
<display-name>creativity</display-name>
<servlet>
<servlet-name>Controller</servlet-name>
<servlet-class>com.creativity.servlet.CreativityServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>Controller</servlet-name>
<url-pattern>/creativity</url-pattern>
</servlet-mapping>
<servlet>
<servlet-name>NameGenerator</servlet-name>
<servlet-class>com.creativity.servlet.GenerateNameServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>NameGenerator</servlet-name>
<url-pattern>/generateName</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
</web-app>
我捕获了下一个异常：
22:16:14,147 ERROR [io.undertow.request] (default task-1) UT005023: Exception handling request to /creativity: java.lang.NullPointerException
at factory.ActionFactory.defineCommand(ActionFactory.java:28)
at com.creativity.servlet.CreativityServlet.processRequest(CreativityServlet.java:39)
at com.creativity.servlet.CreativityServlet.doPost(CreativityServlet.java:33)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:523)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:590)
at io.undertow.servlet.handlers.ServletHandler.handleRequest(ServletHandler.java:74)
at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:129)
at io.opentracing.contrib.jaxrs2.server.SpanFinishingFilter.doFilter(SpanFinishingFilter.java:52)
at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61)
at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)
at io.undertow.servlet.handlers.FilterHandler.handleRequest(FilterHandler.java:84)
at io.undertow.servlet.handlers.security.ServletSecurityRoleHandler.handleRequest(ServletSecurityRoleHandler.java:62)
at io.undertow.servlet.handlers.ServletChain.handleRequest(ServletChain.java:68)
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.RedirectDirHandler.handleRequest(RedirectDirHandler.java:68)
at io.undertow.servlet.handlers.security.SSLInformationAssociationHandler.handleRequest(SSLInformationAssociationHandler.java:117)
at io.undertow.servlet.handlers.security.ServletAuthenticationCallHandler.handleRequest(ServletAuthenticationCallHandler.java:57)
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
at io.undertow.security.handlers.AbstractConfidentialityHandler.handleRequest(AbstractConfidentialityHandler.java:46)
at io.undertow.servlet.handlers.security.ServletConfidentialityConstraintHandler.handleRequest(ServletConfidentialityConstraintHandler.java:64)
at io.undertow.security.handlers.AuthenticationMechanismsHandler.handleRequest(AuthenticationMechanismsHandler.java:60)
at io.undertow.servlet.handlers.security.CachedAuthenticatedSessionHandler.handleRequest(CachedAuthenticatedSessionHandler.java:77)
at io.undertow.security.handlers.NotificationReceiverHandler.handleRequest(NotificationReceiverHandler.java:50)
at io.undertow.security.handlers.AbstractSecurityContextAssociationHandler.handleRequest(AbstractSecurityContextAssociationHandler.java:43)
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 org.wildfly.extension.undertow.deployment.GlobalRequestControllerHandler.handleRequest(GlobalRequestControllerHandler.java:68)
at io.undertow.servlet.handlers.SendErrorPageHandler.handleRequest(SendErrorPageHandler.java:52)
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
at io.undertow.servlet.handlers.ServletInitialHandler.handleFirstRequest(ServletInitialHandler.java:269)
at io.undertow.servlet.handlers.ServletInitialHandler.access0(ServletInitialHandler.java:78)
at io.undertow.servlet.handlers.ServletInitialHandler.call(ServletInitialHandler.java:133)
at io.undertow.servlet.handlers.ServletInitialHandler.call(ServletInitialHandler.java:130)
at io.undertow.servlet.core.ServletRequestContextThreadSetupAction.call(ServletRequestContextThreadSetupAction.java:48)
at io.undertow.servlet.core.ContextClassLoaderSetupAction.call(ContextClassLoaderSetupAction.java:43)
at org.wildfly.extension.undertow.security.SecurityContextThreadSetupAction.lambda$create[=21=](SecurityContextThreadSetupAction.java:105)
at org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create[=21=](UndertowDeploymentInfoService.java:1530)
at org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create[=21=](UndertowDeploymentInfoService.java:1530)
at org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create[=21=](UndertowDeploymentInfoService.java:1530)
at org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create[=21=](UndertowDeploymentInfoService.java:1530)
at org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create[=21=](UndertowDeploymentInfoService.java:1530)
at io.undertow.servlet.handlers.ServletInitialHandler.dispatchRequest(ServletInitialHandler.java:249)
at io.undertow.servlet.handlers.ServletInitialHandler.access[=21=]0(ServletInitialHandler.java:78)
at io.undertow.servlet.handlers.ServletInitialHandler.handleRequest(ServletInitialHandler.java:99)
at io.undertow.server.Connectors.executeRootHandler(Connectors.java:387)
at io.undertow.server.HttpServerExchange.run(HttpServerExchange.java:841)
at org.jboss.threads.ContextClassLoaderSavingRunnable.run(ContextClassLoaderSavingRunnable.java:35)
at org.jboss.threads.EnhancedQueueExecutor.safeRun(EnhancedQueueExecutor.java:1990)
at org.jboss.threads.EnhancedQueueExecutor$ThreadBody.doRunTask(EnhancedQueueExecutor.java:1486)
at org.jboss.threads.EnhancedQueueExecutor$ThreadBody.run(EnhancedQueueExecutor.java:1348)
at org.xnio.XnioWorker$WorkerThreadFactory.run(XnioWorker.java:1280)
at java.lang.Thread.run(Thread.java:748)
我的 EAR 和 EJB 模块的 META-INF 文件夹以及 WAR 模块的 WEB-INF 文件夹中有 beans.xml。
问题的解决方法是什么？
感谢您的评论，正如 null。我处理它在 class 中声明枚举并根据切换条件声明 getter 返回命令。它看起来像下一个：
Commands.java
public class Commands {
public enum CommandEnum {
EMPTY_COMMAND,
NAME_GENERATION,
NAME_GENERATION_SETTINGS,
SIGNIN,
LOGOUT,
LANGUAGE_EDITOR_GET_CULTURES,
LANGUAGE_EDITOR_GET_DETAILS
}
@Inject
@EmptyCommandQualifier
EmptyCommand emptyCommand;
@Inject
@NameGenerationCommandQualifier
NameGenerationCommand nameGenerationCommand;
@Inject
@NameGenerationSettingsCommandQualifier
NameGenerationSettingsCommand nameGenerationSettingsCommand;
@Inject
@SigninCommandQualifier
SigninCommand signinCommand;
@Inject
@LogoutCommandQualifier
LogoutCommand logoutCommand;
@Inject
@LanguageEditorGetCulturesCommandQualifier
LanguageEditorGetCulturesCommand languageEditorGetCulturesCommand;
@Inject
@LanguageEditorGetLanguageDetailsCommandQualifier
LanguageEditorGetLanguageDetailsCommand languageEditorGetLanguageDetailsCommand;
public CommandEnum getCommandEnum(String action) {
return CommandEnum.valueOf(action.toUpperCase());
}
public Command getCommand(CommandEnum commandEnum) {
switch (commandEnum) {
case NAME_GENERATION: return nameGenerationCommand;
case NAME_GENERATION_SETTINGS: return nameGenerationSettingsCommand;
case SIGNIN: return signinCommand;
case LOGOUT: return logoutCommand;
case LANGUAGE_EDITOR_GET_CULTURES: return languageEditorGetCulturesCommand;
case LANGUAGE_EDITOR_GET_DETAILS: return languageEditorGetLanguageDetailsCommand;
default: return emptyCommand;
}
}
}