我需要创建具有所有依赖项的jar。我有正在使用数据库的spring项目,我需要在只有java的另一台计算机上启动spring boot应用程序。我只想要jar文件,并以java -jar jarname.jar
开头
如何创建这个罐子?
UPD: 我的pom:
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.1.6.RELEASE</version>
<relativePath /> <!-- lookup parent from importer.app.pack.repository -->
</parent>
<properties>
<!-- The main class to start by executing java -jar -->
<start-class>app.App</start-class>
</properties>
<build>
<pluginManagement>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-shade-plugin</artifactId>
<version>2.2</version>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>shade</goal>
</goals>
<configuration>
<transformers>
<transformer
implementation="org.apache.maven.plugins.shade.resource.ServicesResourceTransformer" />
<transformer
implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
<mainClass>app.App</mainClass>
</transformer
>
</transformers>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</pluginManagement>
</build>
<dependencies>
<dependency>
<groupId>javax.persistence</groupId>
<artifactId>javax.persistence-api</artifactId>
<version>2.2</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.postgresql</groupId>
<artifactId>postgresql</artifactId>
<version>42.2.8</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
<version>2.0.1.RELEASE</version>
</dependency>
</dependencies>
当我尝试在终端机上java -jar jarname.jar
时
我有例外:
Exception in thread "main" java.lang.NoClassDefFoundError: org/springframework/boot/SpringApplication
答案 0 :(得分:2)
如果它是一个spring boot项目(我想是的,因为异常表明:类org/springframework/boot/SpringApplication
丢失;该类显然属于spring-boot项目),那么您不需要使用Maven阴影插件。
请改为使用spring-boot-maven-plugin
。有关可能的选项和配置的示例,请参见here
<build>
...
<plugins>
...
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<version>2.2.2.RELEASE</version> // or your version
<executions>
<execution>
<goals>
<goal>repackage</goal>
</goals>
</execution>
</executions>
</plugin>
...
</plugins>
...
</build>
此插件背后的想法是,春季靴子实际上并不是一个胖子,而是更复杂的东西。它的内部结构看起来并不像jar(例如,所有依赖项都是BOOT-INT/lib
中的JAR包,因此您有jar内部jar)
或者,如果它是一个没有Spring Boot的spring项目,那么显然您根本不需要在类路径中使用Spring Boot jar。在这种情况下,您也不需要spring-boot-maven-plugin
。