Maven 打包工具从 maven-jar-plugin 改成 maven-dependency-plugin 后 Wrapper 无法启动的问题
🏷️ Maven
修改前使用 maven-jar-plugin 插件打包,maven-dependency-plugin 插件将依赖拷贝到 /lib 目录下。
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<version>2.3.2</version>
<configuration>
<archive>
<manifest>
<addClasspath>true</addClasspath>
<classpathPrefix>lib/</classpathPrefix>
<mainClass>com.mycompany.soa.api.Application</mainClass>
</manifest>
</archive>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-dependency-plugin</artifactId>
<version>2.8</version>
<configuration>
<outputDirectory>${project.build.directory}/lib</outputDirectory>
<excludeTransitive>false</excludeTransitive>
<stripVersion>false</stripVersion>
</configuration>
<executions>
<execution>
<id>copy-dependencies</id>
<phase>prepare-package</phase>
<goals>
<goal>copy-dependencies</goal>
</goals>
<configuration>
<outputDirectory>${project.build.directory}/lib</outputDirectory>
<overWriteReleases>false</overWriteReleases>
<overWriteSnapshots>false</overWriteSnapshots>
<overWriteIfNewer>true</overWriteIfNewer>
<includeScope>compile</includeScope>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>
修改后使用 spring-boot-maven-plugin 插件打包,只生成一个 jar 包,所有的依赖都会打包在该 jar 包中。
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
修改使用 java
命令可以成功启动站点 Spring Boot ,但是在测试环境中有使用 wrapper 打包成服务后始终无法成功启动。
wrapper.log 中的日志如下:
ERROR | wrapper | 2018/08/21 15:39:27 | JVM exited while loading the application.
ERROR | wrapper | 2018/08/21 15:39:33 | JVM exited while loading the application.
ERROR | wrapper | 2018/08/21 15:39:40 | JVM exited while loading the application.
ERROR | wrapper | 2018/08/21 15:39:47 | JVM exited while loading the application.
ERROR | wrapper | 2018/08/21 15:39:53 | JVM exited while loading the application.
FATAL | wrapper | 2018/08/21 15:39:54 | There were 5 failed launches in a row, each lasting less than 300 seconds. Giving up.
FATAL | wrapper | 2018/08/21 15:39:54 | There may be a configuration problem: please check the logs.
由于 jar 包单独可以执行,再根据日志,应该是配置文件 wrapper.conf 中的设置有误导致的。
执行 wrapper 目录的 App.bat 控制台显示如下信息:
wrapper | Launching a JVM...
jvm 2 | WrapperManager: Initializing...
jvm 2 | WrapperSimpleApp Error: Unable to locate the class com.mycompany.soa.api.Application : java.lang.ClassNotFoundException: com.mycompany.soa.api.Application
jvm 2 |
jvm 2 | WrapperSimpleApp Usage:
jvm 2 | java org.tanukisoftware.wrapper.WrapperSimpleApp {app_class{/app_method}} [app_arguments]
jvm 2 |
jvm 2 | Where:
jvm 2 | app_class: The fully qualified class name of the application to run.
jvm 2 | app_arguments: The arguments that would normally be passed to the
jvm 2 | application.
jvm 2 | Picked up JAVA_TOOL_OPTIONS: -Dfile.encoding=UTF-8
wrapper | JVM exited while loading the application.
日志中显示找不到 com.mycompany.soa.api.Application 类,但这个类肯定是打包进去了的。
这个类名是在配置文件中的 wrapper.app.parameter 中配置的,用来设置 jar 包的 main class。
# Application parameters. Add parameters as needed starting from 1
wrapper.app.parameter.1=com.octopus.soa.api.Application
用 WinRAR 打开 jar 包查看,发现结构变化了好多,MANIFEST.MF 文件中的内容也变了很多。
使用 spring-boot-maven-plugin 插件打包的 jar 文件的结构 和 MANIFEST.MF 文件内容如下。
example.jar
|
+-META-INF
| +-MANIFEST.MF
+-org
| +-springframework
| +-boot
| +-loader
| +-<spring boot loader classes>
+-BOOT-INF
+-classes
| +-mycompany
| +-project
| +-YourClasses.class
+-lib
+-dependency1.jar
+-dependency2.jar
MANIFEST.MF
Manifest-Version: 1.0
Implementation-Title: Api
Implementation-Version: 1.0-SNAPSHOT
Built-By: liujiajia
Implementation-Vendor-Id: com.mycompany
Spring-Boot-Version: 2.0.4.RELEASE
Main-Class: org.springframework.boot.loader.JarLauncher
Start-Class: com.mycompany.soa.api.Application
Spring-Boot-Classes: BOOT-INF/classes/
Spring-Boot-Lib: BOOT-INF/lib/
Created-By: Apache Maven 3.0.5
Build-Jdk: 1.8.0_101
Implementation-URL: https://projects.spring.io/spring-boot/#/spring-boot-starter-parent/mycompany/Api
根据 MANIFEST.MF 新打的 jar 包的 Main-Class 已经变成了 org.springframework.boot.loader.JarLauncher。将 wrapper.app.parameter.1 的值改了之后就可以正常启动了。
# Application parameters. Add parameters as needed starting from 1
wrapper.app.parameter.1=org.springframework.boot.loader.JarLauncher
再贴下使用 maven-jar-plugin 插件打包的 jar 文件的结构 和 MANIFEST.MF 文件内容,做下对比。
example.jar
|
+-application.properties
+-META-INF
| +-MANIFEST.MF
| +-maven
| +-mycompany
| +-project
| +-pom.properties
| +-pom.xml
+-mycompany
+-project
| +-YourClasses.class
MANIFEST.MF
Manifest-Version: 1.0
Archiver-Version: Plexus Archiver
Created-By: Apache Maven
Built-By: liujiajia
Build-Jdk: 1.8.0_101
Main-Class: com.mycompany.soa.api.Application
Class-Path: lib/spring-boot-starter-web-1.4.0.RELEASE.jar lib/spring-boot-starter-1.4.0.RELEASE.jar
···
lib/jboss-logging-3.2.1.Final.jar