使用gradle 3和java 7的spring boot在服务器启动时失败

Question

I have started playing with gradle and spring boot and picked some nice 'n easy tutorials as listed below. My setup is also listed below.

Though the tutorial states that Java 1.8 is required, I have read that both gradle and boot can be used on Java 1.7 also.

So, any reason why this simple tutorial shouldn't work for Java 1.7? Apparently ...

I create my gradlew as follows: gradle wrapper --gradle-version 3.0 and then run my gradle build command as ususal: ./gradlew build && java -jar build/libs/gs-spring-boot-0.1.0.jar in my project directory.

Setup:

• OS: 12.04 LTS 32-bit

• java version "1.7.0_80"

• tutorials:

  • https://spring.io/guides/gs/spring-boot/#scratch

  • https://docs.gradle.org/current/userguide/gradle_wrapper.html

build.gradle ( NOTE : I specify target/sourceCompatibility = 1.7):

buildscript {
    repositories {
        mavenCentral()
    }
    dependencies {
        classpath("org.springframework.boot:spring-boot-gradle-plugin:1.4.0.RELEASE")
    }
}

apply plugin: 'java'
apply plugin: 'eclipse'
apply plugin: 'idea'
apply plugin: 'spring-boot'

jar {
    baseName = 'gs-spring-boot'
    version =  '0.1.0'
}

repositories {
    mavenCentral()
}

sourceCompatibility = 1.7
targetCompatibility = 1.7

dependencies {
    // tag::jetty[]
    compile("org.springframework.boot:spring-boot-starter-web") {
        exclude module: "spring-boot-starter-tomcat"
    }
    compile("org.springframework.boot:spring-boot-starter-jetty")
    // end::jetty[]
    // tag::actuator[]
    compile("org.springframework.boot:spring-boot-starter-actuator")
    // end::actuator[]
    testCompile("junit:junit")
}

output:

Note that the error occurs at server startup, ie here: org.springframework.context.ApplicationContextException: Unable to start embedded container

vagrant@precise32:/vagrant/BootTutorial$ ./gradlew build && java -jar build/libs/gs-spring-boot-0.1.0.jar
:compileJava UP-TO-DATE
:processResources UP-TO-DATE
:classes UP-TO-DATE
:findMainClass
:jar
:bootRepackage
:assemble
:compileTestJava UP-TO-DATE
:processTestResources UP-TO-DATE
:testClasses UP-TO-DATE
:test UP-TO-DATE
:check UP-TO-DATE
:build

BUILD SUCCESSFUL

Total time: 4.835 secs

  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::        (v1.4.0.RELEASE)

2016-09-03 18:57:49.456  INFO 2043 --- [           main] hello.Application                        : Starting Application on precise32 with PID 2043 (/vagrant/BootTutorial/build/libs/gs-spring-boot-0.1.0.jar started by vagrant in /vagrant/BootTutorial)
2016-09-03 18:57:49.518  INFO 2043 --- [           main] hello.Application                        : No active profile set, falling back to default profiles: default
2016-09-03 18:57:50.136  INFO 2043 --- [           main] ationConfigEmbeddedWebApplicationContext : Refreshing org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@65b0e5: startup date [Sat Sep 03 18:57:50 AEST 2016]; root of context hierarchy
2016-09-03 18:57:58.795  WARN 2043 --- [           main] ationConfigEmbeddedWebApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.context.ApplicationContextException: Unable to start embedded container; nested exception is org.springframework.context.ApplicationContextException: Unable to start EmbeddedWebApplicationContext due to missing EmbeddedServletContainerFactory bean.
2016-09-03 18:57:59.019 ERROR 2043 --- [           main] o.s.boot.SpringApplication               : Application startup failed

org.springframework.context.ApplicationContextException: Unable to start embedded container; nested exception is org.springframework.context.ApplicationContextException: Unable to start EmbeddedWebApplicationContext due to missing EmbeddedServletContainerFactory bean.
        at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.onRefresh(EmbeddedWebApplicationContext.java:137) ~[spring-boot-1.4.0.RELEASE.jar!/:1.4.0.RELEASE]
        at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:535) ~[spring-context-4.3.2.RELEASE.jar!/:4.3.2.RELEASE]
        at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:122) ~[spring-boot-1.4.0.RELEASE.jar!/:1.4.0.RELEASE]
        at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:759) [spring-boot-1.4.0.RELEASE.jar!/:1.4.0.RELEASE]
        at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:369) [spring-boot-1.4.0.RELEASE.jar!/:1.4.0.RELEASE]
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:313) [spring-boot-1.4.0.RELEASE.jar!/:1.4.0.RELEASE]
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:1185) [spring-boot-1.4.0.RELEASE.jar!/:1.4.0.RELEASE]
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:1174) [spring-boot-1.4.0.RELEASE.jar!/:1.4.0.RELEASE]
        at hello.Application.main(Application.java:13) [classes!/:na]
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.7.0_80]
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) ~[na:1.7.0_80]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.7.0_80]
        at java.lang.reflect.Method.invoke(Method.java:606) ~[na:1.7.0_80]
        at org.springframework.boot.loader.MainMethodRunner.run(MainMethodRunner.java:48) [gs-spring-boot-0.1.0.jar:na]
        at org.springframework.boot.loader.Launcher.launch(Launcher.java:87) [gs-spring-boot-0.1.0.jar:na]
        at org.springframework.boot.loader.Launcher.launch(Launcher.java:50) [gs-spring-boot-0.1.0.jar:na]
        at org.springframework.boot.loader.JarLauncher.main(JarLauncher.java:58) [gs-spring-boot-0.1.0.jar:na]
Caused by: org.springframework.context.ApplicationContextException: Unable to start EmbeddedWebApplicationContext due to missing EmbeddedServletContainerFactory bean.
        at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.getEmbeddedServletContainerFactory(EmbeddedWebApplicationContext.java:189) ~[spring-boot-1.4.0.RELEASE.jar!/:1.4.0.RELEASE]
        at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.createEmbeddedServletContainer(EmbeddedWebApplicationContext.java:162) ~[spring-boot-1.4.0.RELEASE.jar!/:1.4.0.RELEASE]
        at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.onRefresh(EmbeddedWebApplicationContext.java:134) ~[spring-boot-1.4.0.RELEASE.jar!/:1.4.0.RELEASE]
        ... 16 common frames omitted

vagrant@precise32:/vagrant/BootTutorial$

Answer 1

With Spring Boot 1.4, the default Jetty version is 9.3, which requires JDK8.

If you want to stick to JDK7, you can use Jetty 9.2 as explained in the reference documentation .

Answer 2

Did you actually look at the stack? It clearly says "Port 8080 in use". There are two possibilities, either you have some kind of server or service listening to port 8080 or you have a hanging thread in the background from your last run.

Answer 3

I'm not sure how your Application.java class looks like.But I'm guessing you are missing something like this.

@Configuration
@ComponentScan
@EnableAutoConfiguration
public class Application {
  public static void main(String[] args) {
    SpringApplication.run(YourClassToRun.class, args);
  }
}