我正在使用maven shade插件创建一个可执行的uber jar,它依赖于我希望它在包阶段包含的本地系统jar(mobile-dock-support.jar)中的某些类,所以我将shade插件配置为如此
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-shade-plugin</artifactId>
<version>2.4.2</version>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>shade</goal>
</goals>
<configuration>
<transformers>
<transformer
implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
<mainClass>uk.xxx.mobiledock.PCSyncApplication</mainClass>
</transformer>
</transformers>
</configuration>
</execution>
</executions>
<dependencies>
<dependency>
<groupId>uk.xxx</groupId>
<artifactId>mobile-dock-support</artifactId>
<version>0.0.1-SNAPSHOT</version>
<scope>system</scope>
<systemPath>${project.build.directory}/../src/main/libs/mobile-dock-support.jar</systemPath>
</dependency>
</dependencies>
</plugin>
似乎打包罐子很好但是当我使用java -jar xxx.jar
运行jar时它给了我以下
java.lang.NoClassDefFoundError: uk/xxx/mobiledock/MobileDockException
at java.lang.Class.getDeclaredMethods0(Native Method)
at java.lang.Class.privateGetDeclaredMethods(Unknown Source)
at java.lang.Class.privateGetMethodRecursive(Unknown Source)
at java.lang.Class.getMethod0(Unknown Source)
at java.lang.Class.getMethod(Unknown Source)
at sun.launcher.LauncherHelper.validateMainClass(Unknown Source)
at sun.launcher.LauncherHelper.checkAndLoadMain(Unknown Source)
Caused by: java.lang.ClassNotFoundException: uk.xxx.mobiledock.MobileDockException
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 7 more
Error: A JNI error has occurred, please check your installation and try again
Exception in thread "main"
我还设置了exec maven插件,运行mvn exec:java -Dexec.mainClass=uk.xxx.mobiledock.PCSyncApplication
按预期运行程序。
以下是exec maven插件的设置方法
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>exec-maven-plugin</artifactId>
<version>1.4.0</version>
<executions>
<execution>
<goals>
<goal>java</goal>
</goals>
</execution>
</executions>
<configuration>
<includePluginDependencies>true</includePluginDependencies>
<mainClass>uk.xxx.mobiledock.PCSyncApplication</mainClass>
</configuration>
<dependencies>
<dependency>
<groupId>uk.xxx</groupId>
<artifactId>mobile-dock-support</artifactId>
<version>0.0.1-SNAPSHOT</version>
<scope>system</scope>
<systemPath>${project.build.directory}/../src/main/libs/mobile-dock-support.jar</systemPath>
</dependency>
</dependencies>
</plugin>
答案 0 :(得分:0)
好吧然后看来问题是阴影插件不会将系统依赖关系复制到超级jar。有几种“正确”的方法来解决这个问题
使用mvn install
使用存储库管理器,例如Nexus
如果你像我一样,并且没有上述两个选项,因为它是一个合作项目,并且没有像Nexus这样的选项,那么我就是为了让它工作而做的
使用maven依赖项插件将任何系统依赖项复制到相对于打包jar的某个位置,例如。
<plugin>
<artifactId>maven-dependency-plugin</artifactId>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>copy-dependencies</goal>
</goals>
<configuration>
<outputDirectory>${project.build.directory}/lib</outputDirectory>
<includeArtifactIds>mobile-dock-support</includeArtifactIds>
</configuration>
</execution>
</executions>
</plugin>
将复制的jar作为类路径的一部分添加到uber jar的清单文件中,例如
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-shade-plugin</artifactId>
<version>2.4.2</version>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>shade</goal>
</goals>
<configuration>
<transformers>
<transformer
implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
<manifestEntries>
<Main-Class>uk.xxx.mobiledock.PCSyncApplication</Main-Class>
<Class-Path>lib/mobile-dock-support-${mobile-dock-support.version}.jar</Class-Path>
</manifestEntries>
</transformer>
</transformers>
</configuration>
</execution>
</executions>
</plugin>