[英]Create an executable jar for a project that uses spring data jpa and maven
我正在尝试使用java -jar <myJarName>
执行一个 jar
我尝试了多种方法来创建这个带有依赖项的 jar
在 pom 文件中添加了“maven 依赖”和“maven jar”插件
<build>
<plugins>
<plugin>
<artifactId>maven-dependency-plugin</artifactId>
<executions>
<execution>
<phase>install</phase>
<goals>
<goal>copy-dependencies</goal>
</goals>
<configuration>
<outputDirectory>${project.build.directory}/lib</outputDirectory>
</configuration>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<configuration>
<useDefaultManifestFile>true</useDefaultManifestFile>
<archive>
<manifest>
<addClasspath>true</addClasspath>
<mainClass>fully.qualified.MainClass</mainClass>
<classpathPrefix>lib/</classpathPrefix>
</manifest>
</archive>
</configuration>
</plugin>
</plugins>
</build>
这里发生的是清单包含所有类路径,但没有复制任何依赖项
尝试了“Maven 程序集插件”
<build>
<plugins>
<plugin>
<artifactId>maven-assembly-plugin</artifactId>
<configuration>
<archive>
<manifest>
<mainClass>fully.qualified.MainClass</mainClass>
</manifest>
</archive>
<descriptorRefs>
<descriptorRef>jar-with-dependencies</descriptorRef>
</descriptorRefs>
</configuration>
<executions>
<execution>
<id>make-assembly</id> <!-- this is used for inheritance merges -->
<phase>package</phase> <!-- bind to the packaging phase -->
<goals>
<goal>single</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
创建了第二个以 jar-with-dependencies 结尾的 jar,其中包含我需要的一切。 但是调用 jar 失败并出现错误
Exception in thread "main" org.springframework.beans.factory.parsing.BeanDefinitionParsingException: Configuration problem: Unable to locate Spring NamespaceHandler for XML schema namespace [http://www.springframework.org/schema/data/jpa]
Offending resource: class path resource [META-INF/spring/app-context.xml]
at org.springframework.beans.factory.parsing.FailFastProblemReporter.error(FailFastProblemReporter.java:70)
at org.springframework.beans.factory.parsing.ReaderContext.error(ReaderContext.java:85)
我验证了 META-INF/Persistence.xml 存在
尝试了 maven-shade-plugin
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-shade-plugin</artifactId>
<version>2.1</version>
<executions>
<execution>
<phase>package</phase>
<goals><goal>shade</goal></goals>
<configuration>
<transformers>
<transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
<mainClass>fully.qualified.MainClass</mainClass>
</transformer>
<transformer implementation="org.apache.maven.plugins.shade.resource.AppendingTransformer">
<resource>META-INF/spring.handlers</resource>
</transformer>
<transformer implementation="org.apache.maven.plugins.shade.resource.AppendingTransformer">
<resource>META-INF/spring.schemas</resource>
</transformer>
</transformers>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>
这个也复制了所有的依赖项,但失败并出现错误
[main] INFO org.springframework.jdbc.datasource.DriverManagerDataSource - Loaded JDBC driver: org.h2.Driver
1022 [main] WARN org.springframework.context.support.ClassPathXmlApplicationContext - Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'entityManagerFactory' defined in com.vmware.vra.performance.loganalyzer.Repository.JpaConfiguration: Invocation of init method failed; nested exception is java.lang.IllegalStateException: No persistence units parsed from {classpath*:META-INF/persistence.xml}
Exception in thread "main" org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'entityManagerFactory' defined in com.vmware.vra.performance.loganalyzer.Repository.JpaConfiguration: Invocation of init method failed; nested exception is java.lang.IllegalStateException: No persistence units parsed from {classpath*:META-INF/persistence.xml}
只需使用 SpringBoot。 它用于生成一个胖可执行 jar。 您可以使用https://start.spring.io/为 Maven 创建一个 SpringBoot 项目,您可以将代码导入其中。 就冲突而言,使用 Spring BOM for Maven,如下所示: https : //www.baeldung.com/spring-maven-bom
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-framework-bom</artifactId>
<version>4.3.8.RELEASE</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
它将确保您的所有版本都是一致的。
我也选择了第二个选项,并遇到了类似的问题。 您遇到的问题是您正在组合多个 spring 依赖项,这些依赖项提供了工厂、处理程序、命名空间的每个定义,并且您遇到了冲突。
解决此问题的方法是检查此类定义的所有 spring 依赖项,并通过组合它们将它们添加到您的项目中。 有关更多详细信息,您可以查看此博客条目或我组合配置的此 maven 模块。
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