spring boot的嵌入式tomcat服务器如何加载外部“war”文件

Question

我正在尝试将“war”文件加载到 Spring boot 的嵌入式 tomcat 服务器。 为此，我找到了这个答案： Spring Boot: How to add another WAR files to the embedded tomcat?

但是在我这样做之后，我发现在这个问题上已经提出了同样的错误： Deploying existing war with Embedded Tomcat但没有令人满意的答案。

注意：我知道它可以被视为一个重复的问题（我放了链接），但当时没有足够的声誉来添加评论或私下联系作者的能力，我认为有必要重复问题希望得到一些不同的答案。

特别是我尝试加载在 spring boot 项目的“resources/war/”文件夹中分配的芝麻战争文件。

我的 SpringBoot 应用程序：

@SpringBootApplication
@ComponentScan("com.github.p4535992.mvc")
public class JspDemoApplication extends SpringBootServletInitializer implements WebApplicationInitializer{

public static void main(String[] args) {
    SpringApplication.run(JspDemoApplication.class, args);
}

@Override
protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
    return application.sources(JspDemoApplication.class);
}

@Override
public void onStartup(ServletContext servletContext) throws ServletException {
    SpringApplication.run(JspDemoApplication.class);
}

/*
 * https://stackoverflow.com/questions/31374726/spring-boot-how-to-add-another-war-files-to-the-embedded-tomcat
 * @return the {@link TomcatEmbeddedServletContainerFactory}.
 */
@Bean
public EmbeddedServletContainerFactory servletContainerFactory() {
    return new TomcatEmbeddedServletContainerFactory() {
        @Override
        protected TomcatEmbeddedServletContainer getTomcatEmbeddedServletContainer(Tomcat tomcat) {
            try {
                //tomcat.addUser("tomcat", "tomcat");
                //tomcat.addRole("tomcat", "manager-gui");
                String webappDirLocation = System.getProperty("user.dir")+"/src/main/resources/war/";
                //When the spring boot application is made of fat jar(=executable jar),
                // the above code is not enough             
                Context context1 = tomcat.addWebapp("/sesame", new
                        File(webappDirLocation+"openrdf-sesame.war").getAbsolutePath());
                Context context2 =  tomcat.addWebapp("/workbench",new
                        File(webappDirLocation+"openrdf-workbench.war").getAbsolutePath());
                WebappLoader loader = new WebappLoader(Thread.currentThread().getContextClassLoader());
                context1.setLoader(loader);
                context2.setLoader(loader);

            } catch (ServletException ex) {
                throw new IllegalStateException("Failed to add webapp", ex);
            }
            return super.getTomcatEmbeddedServletContainer(tomcat);
        }

    };
}
}

我的旧异常： old_exception

更新：

注意：我在 Windows 上工作只是为了澄清。

1. 将参数添加到 application.properties 文件： server.tomcat.basedir=${java.io.tmpdir} 。
2. 设置 JAVA_OPTIONS: -Djava.io.tmpdir=C:\\Users\\Utente\\Desktop\\path\\springMVC12\\Temp 。
3. 在“Temp”目录下手动创建目录“sesame”和“workbench” （更多细节或其他方式见OrangeDog的评论）
4. 使用@Configuration Spring Annotation 创建一个类 AppConfig.java，将方法“EmbeddedServletContainerFactory”从 JspDemoApplication.java 剪切并粘贴到 AppConfig.java。

现在没有抛出异常，但是当我尝试在地址http://localhost:8081/openrdf-sesame 、 http://localhost:8081/sesame上调用 webapp 时，我收到错误 404 资源未找到。

例如"status":404,"error":"Not Found","message":"No message available"

所以现在似乎war文件已加载，但我必须错过网络应用程序的http url集上的某些内容。

更新 2 Spring Boot 的新 Application.java：

@SpringBootApplication
@ComponentScan("com.github.p4535992.mvc")

public class MainApp extends SpringBootServletInitializer implements WebApplicationInitializer{

public static void main(String[] args) {
    SpringApplication.run(MainApp.class, args);
}

@Override
protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
    return application.sources(MainApp.class);
}

@Override
public void onStartup(ServletContext servletContext) throws ServletException {
    //com.github.p4535992.mvc.component.ScheduledTasks --> Work
    SpringApplication.run(MainApp.class);
}

@Bean
public EmbeddedServletContainerFactory servletContainerFactory() {
    return new TomcatEmbeddedServletContainerFactory() {
        @Override
        protected TomcatEmbeddedServletContainer getTomcatEmbeddedServletContainer(Tomcat tomcat) {
            try {
                String webappDirLocation = "src/main/resources/war/";
                tomcat.addWebapp("/sesame", new
                        File(webappDirLocation+"openrdf-sesame.war").getAbsolutePath());
                tomcat.addWebapp("/workbench",new
                        File(webappDirLocation+"openrdf-workbench.war").getAbsolutePath());
            } catch (ServletException ex) {
                throw new IllegalStateException("Failed to add webapp", ex);
            }
            return super.getTomcatEmbeddedServletContainer(tomcat);
        }

    };
}
}

现在我有一个新的例外：

2016-04-09_10:25:01.998 [Tomcat-startStop-1] ERROR org.apache.catalina.core.ContainerBase - A child container failed during start
java.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Tomcat].StandardHost[localhost].StandardContext[]]
at java.util.concurrent.FutureTask.report(FutureTask.java:122)
at java.util.concurrent.FutureTask.get(FutureTask.java:192)
at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:916)
at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:871)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:147)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1408)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1398)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Tomcat].StandardHost[localhost].StandardContext[]]
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:153)
... 6 common frames omitted
Caused by: java.lang.IllegalStateException: java.lang.NullPointerException
at org.springframework.boot.context.embedded.tomcat.TomcatResources$Tomcat7Resources.addJar(TomcatResources.java:125)
at org.springframework.boot.context.embedded.tomcat.TomcatResources.addClasspathResources(TomcatResources.java:63)
at org.springframework.boot.context.embedded.tomcat.TomcatEmbeddedServletContainerFactory$StoreMergedWebXmlListener.onStart(TomcatEmbeddedServletContainerFactory.java:746)
at org.springframework.boot.context.embedded.tomcat.TomcatEmbeddedServletContainerFactory$StoreMergedWebXmlListener.lifecycleEvent(TomcatEmbeddedServletContainerFactory.java:737)
at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:95)
at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:90)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5154)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:147)
... 6 common frames omitted
Caused by: java.lang.NullPointerException: null
at org.springframework.boot.context.embedded.tomcat.TomcatResources$Tomcat7Resources.addJar(TomcatResources.java:122)
... 13 common frames omitted
2016-04-09_10:06:32.378 [localhost-startStop-1] ERROR o.a.c.c.ContainerBase.[Tomcat].[localhost].[/sesame] - Servlet [jsp] in web application [/sesame] threw load() exception
java.lang.ClassNotFoundException: org.apache.jasper.servlet.JspServlet
at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1308)
at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1142)
at org.apache.catalina.core.DefaultInstanceManager.loadClass(DefaultInstanceManager.java:518)
at org.apache.catalina.core.DefaultInstanceManager.loadClassMaybePrivileged(DefaultInstanceManager.java:499)
at org.apache.catalina.core.DefaultInstanceManager.newInstance(DefaultInstanceManager.java:118)
at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1102)
at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:1038)
at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:4997)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5289)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:147)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1408)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1398)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
2016-04-09_10:06:32.568 [localhost-startStop-1] ERROR o.a.c.c.C.[Tomcat].[localhost].[/workbench] - Servlet [jsp] in web application [/workbench] threw load() exception
java.lang.ClassNotFoundException: org.apache.jasper.servlet.JspServlet
at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1308)
at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1142)
at org.apache.catalina.core.DefaultInstanceManager.loadClass(DefaultInstanceManager.java:518)
at org.apache.catalina.core.DefaultInstanceManager.loadClassMaybePrivileged(DefaultInstanceManager.java:499)
at org.apache.catalina.core.DefaultInstanceManager.newInstance(DefaultInstanceManager.java:118)
at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1102)
at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:1038)
at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:4997)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5289)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:147)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1408)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1398)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
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)

我尝试解决添加 maven 依赖项的问题，但它不起作用：

 <!-- Support for add war to the project -->
    <dependency>
        <groupId>org.apache.tomcat</groupId>
        <artifactId>tomcat-jasper</artifactId>
        <version>9.0.0.M4</version>
    </dependency>
    <!-- https://stackoverflow.com/questions/4501829/unable-to-load-class-for-jsp -->
    <dependency>
        <groupId>javax.servlet.jsp</groupId>
        <artifactId>javax.servlet.jsp-api</artifactId>
        <version>2.3.2-b02</version>
        <scope>provided</scope>
    </dependency>

任何帮助都更受欢迎。

Answer 1

我发现在这个问题上已经问过同样的错误：Deploying existing war with Embedded Tomcat 但没有令人满意的答案。

因为这样的配置对于 Spring Boot 没有意义。 Spring Boot 有两种选择：

1. WAR，部署在共享和托管的 servlet 容器上
2. fat JAR，您的单个应用程序将在单个嵌入式 servlet 容器上运行

阅读 Spring Boot 文档的这一部分以获取更多信息。

另请注意，您所指的问题与 Spring/Spring Boot 无关。