Spring Boot，Spring加载，Eclipse，Maven基本示例

Question

我发现，根据文档，带有Spring负载的Spring Boot的基本示例设置不起作用。我在办公室里按照指示做了http://docs.spring.io/spring-boot/docs/current-SNAPSHOT/reference/htmlsingle/#getting-启动第一个应用程序来创建一个基本的应用程序，唯一的区别是我将我的类放入一个包中，并使用父pom的发布版本。应用程序运行良好。然后，我将spring loaded添加到pom文件中，如doco中所述。

我运行的应用程序与mvnSpring启动：运行。

改变我的控制器输出例如。“你好世界”到“你好我”不热重载。

我试着用其他地方描述的javaagent命令行参数作为java应用程序运行，但这也不起作用。

pom看起来像这样：

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.example</groupId>
<artifactId>myproject</artifactId>
<version>0.0.1-SNAPSHOT</version>

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>1.2.0.RELEASE</version>
</parent>

<!-- Additional lines to be added here... -->
<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
</dependencies>

<build>
    <plugins>
        <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
            <dependencies>
                <dependency>
                    <groupId>org.springframework</groupId>
                    <artifactId>springloaded</artifactId>
                    <version>1.2.1.RELEASE</version>
                </dependency>
            </dependencies>
        </plugin>
    </plugins>
</build>

这里可以找到编译的类：project_dir\target\classes（我正在使用Eclipse和m2e插件）。

启动日志：

[INFO] Scanning for projects...
[INFO] 
[INFO] Using the builder org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder with a thread count of 1
[INFO]                                                                         
[INFO] ------------------------------------------------------------------------
[INFO] Building myproject 0.0.1-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO] 
[INFO] >>> spring-boot-maven-plugin:1.2.0.RELEASE:run (default-cli) @ myproject >>>
[INFO] 
[INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ myproject ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] Copying 1 resource
[INFO] Copying 0 resource
[INFO] 
[INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ myproject ---
[INFO] Changes detected - recompiling the module!
[INFO] Compiling 1 source file to C:\dev\src\scrapi\target\classes
[INFO] 
[INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) @ myproject ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] skip non existing resourceDirectory C:\dev\src\scrapi\src\test\resources
[INFO] 
[INFO] --- maven-compiler-plugin:3.1:testCompile (default-testCompile) @ myproject ---
[INFO] No sources to compile
[INFO] 
[INFO] <<< spring-boot-maven-plugin:1.2.0.RELEASE:run (default-cli) @ myproject <<<
[INFO] 
[INFO] --- spring-boot-maven-plugin:1.2.0.RELEASE:run (default-cli) @ myproject ---

  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::        (v1.2.0.RELEASE)

2015-01-02 13:23:25.311  INFO 2180 --- [.Example.main()] first.Example                            : Starting Example on DEFRAVD804016 with PID 2180 (C:\dev\src\scrapi\target\classes started by john in C:\dev\src\scrapi)
2015-01-02 13:23:25.359  INFO 2180 --- [.Example.main()] ationConfigEmbeddedWebApplicationContext : Refreshing org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@44354005: startup date [Fri Jan 02 13:23:25 CET 2015]; root of context hierarchy
2015-01-02 13:23:26.193  INFO 2180 --- [.Example.main()] o.s.b.f.s.DefaultListableBeanFactory     : Overriding bean definition for bean 'beanNameViewResolver': replacing [Root bean: class [null]; scope=; abstract=false; lazyInit=false; autowireMode=3; dependencyCheck=0; autowireCandidate=true; primary=false; factoryBeanName=org.springframework.boot.autoconfigure.web.ErrorMvcAutoConfiguration$WhitelabelErrorViewConfiguration; factoryMethodName=beanNameViewResolver; initMethodName=null; destroyMethodName=(inferred); defined in class path resource [org/springframework/boot/autoconfigure/web/ErrorMvcAutoConfiguration$WhitelabelErrorViewConfiguration.class]] with [Root bean: class [null]; scope=; abstract=false; lazyInit=false; autowireMode=3; dependencyCheck=0; autowireCandidate=true; primary=false; factoryBeanName=org.springframework.boot.autoconfigure.web.WebMvcAutoConfiguration$WebMvcAutoConfigurationAdapter; factoryMethodName=beanNameViewResolver; initMethodName=null; destroyMethodName=(inferred); defined in class path resource [org/springframework/boot/autoconfigure/web/WebMvcAutoConfiguration$WebMvcAutoConfigurationAdapter.class]]
2015-01-02 13:23:27.121  INFO 2180 --- [.Example.main()] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat initialized with port(s): 8182/http
2015-01-02 13:23:27.689  INFO 2180 --- [.Example.main()] o.apache.catalina.core.StandardService   : Starting service Tomcat
2015-01-02 13:23:27.691  INFO 2180 --- [.Example.main()] org.apache.catalina.core.StandardEngine  : Starting Servlet Engine: Apache Tomcat/8.0.15
2015-01-02 13:23:27.814  INFO 2180 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
2015-01-02 13:23:27.814  INFO 2180 --- [ost-startStop-1] o.s.web.context.ContextLoader            : Root WebApplicationContext: initialization completed in 2457 ms
2015-01-02 13:23:28.653  INFO 2180 --- [ost-startStop-1] o.s.b.c.e.ServletRegistrationBean        : Mapping servlet: 'dispatcherServlet' to [/]
2015-01-02 13:23:28.657  INFO 2180 --- [ost-startStop-1] o.s.b.c.embedded.FilterRegistrationBean  : Mapping filter: 'hiddenHttpMethodFilter' to: [/*]
2015-01-02 13:23:28.657  INFO 2180 --- [ost-startStop-1] o.s.b.c.embedded.FilterRegistrationBean  : Mapping filter: 'characterEncodingFilter' to: [/*]
2015-01-02 13:23:28.883  INFO 2180 --- [.Example.main()] s.w.s.m.m.a.RequestMappingHandlerAdapter : Looking for @ControllerAdvice: org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@44354005: startup date [Fri Jan 02 13:23:25 CET 2015]; root of context hierarchy
2015-01-02 13:23:28.995  INFO 2180 --- [.Example.main()] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/],methods=[],params=[],headers=[],consumes=[],produces=[],custom=[]}" onto java.lang.String first.Example.home()
2015-01-02 13:23:28.997  INFO 2180 --- [.Example.main()] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/error],methods=[],params=[],headers=[],consumes=[],produces=[],custom=[]}" onto public org.springframework.http.ResponseEntity<java.util.Map<java.lang.String, java.lang.Object>> org.springframework.boot.autoconfigure.web.BasicErrorController.error(javax.servlet.http.HttpServletRequest)
2015-01-02 13:23:28.998  INFO 2180 --- [.Example.main()] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/error],methods=[],params=[],headers=[],consumes=[],produces=[text/html],custom=[]}" onto public org.springframework.web.servlet.ModelAndView org.springframework.boot.autoconfigure.web.BasicErrorController.errorHtml(javax.servlet.http.HttpServletRequest)
2015-01-02 13:23:29.112  INFO 2180 --- [.Example.main()] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped URL path [/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2015-01-02 13:23:29.112  INFO 2180 --- [.Example.main()] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped URL path [/webjars/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2015-01-02 13:23:29.160  INFO 2180 --- [.Example.main()] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped URL path [/**/favicon.ico] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2015-01-02 13:23:29.268  INFO 2180 --- [.Example.main()] o.s.j.e.a.AnnotationMBeanExporter        : Registering beans for JMX exposure on startup
2015-01-02 13:23:29.394  INFO 2180 --- [.Example.main()] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat started on port(s): 8182/http
2015-01-02 13:23:29.399  INFO 2180 --- [.Example.main()] first.Example                            : Started Example in 4.417 seconds (JVM running for 11.803)

在这种情况下，我需要做什么来使Spring加载工作？

Answer 1

尝试添加Spring-Loaded作为Spring-Boot-Maven插件的依赖项：

<build>
    <plugins>
        <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
            <dependencies>
                <dependency>
                    <groupId>org.springframework</groupId>
                    <artifactId>springloaded</artifactId>
                    <version>${spring-loaded.version}</version>
                </dependency>
            </dependencies>
        </plugin>
    </plugins>
</build>

我已经用一个简单的Spring-Cloud应用程序运行了Spring-Loaded。

Answer 2

好吧，我至少有一个我偶然发现的解决方法。希望这能帮助人们弄清楚到底发生了什么。摘要：在pom中配置调试器时，它会工作。

我想启用调试，所以我添加了以下内容到pom中，如插件doco中所述：

<configuration>
  <jvmArguments>
    -Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=5005
  </jvmArguments>
</configuration>

然后我重新启动了应用程序，瞧，我在spring徽标之前的日志中看到：

[INFO] Attaching agents: [C:\dev\maven_local\org\springframework\springloade
d\1.2.1.RELEASE\springloaded-1.2.1.RELEASE.jar]
Listening for transport dt_socket at address: 5005

然后启动停止，应用程序将不会开始服务请求，直到附加调试器（这正常吗？编辑：重新阅读我链接到的页面，我看到这是预期的。如果有一种方法可以让启动继续进行，而不需要附加调试器，但保持调试端口打开），那就太好了。一旦安装了调试器，就会出现Spring徽标和其他启动日志。然后我拆下调试器（只是为了证明重新加载不是通过调试器进行的），应用程序继续为请求提供服务，果然，热重新加载工作正常！

非常感谢@DaveSyer帮助放弃各种其他可能性。这将做现在，虽然它没有记录下来，我想这个需求不是设计出来的，如果它在所有情况下都能工作，那就太棒了。

Answer 3

我从来没有得到Spring加载这样工作。就我个人而言，我使用每次都对我有效的“老路”。请尝试遵循以下内容：

在eclipse中打开运行/调试配置。

在左侧展开Java应用程序选项并选择您的运行配置<代码>应用程序在我的例子中。设置错误的配置是常见的错误，因此请确保project和main class是正确的。

编辑VM参数并将其设置为-javaagent:

包含了一个gradle构建脚本，运行'./gradlew构建'来重建代理-它将被创建为类似于：springload/build/libs/springload-1.1.5。构建-快照. jar

现在你可以启动你的新配置了。在浏览器中检查之前，请在eclipse中检查您的配置。右键单击您的java应用程序a选择属性。

然后您应该看到您的应用程序正在使用javaagent运行。

请让我们知道这是否适用于您。