[英]NoClassDefFoundError: Maven intermodule dependency
I have my Storm application (maven) project structured as follow: 我的Storm应用程序(Maven)项目的结构如下:
parent-project/
├── pom.xml
├── storm-application/
└── pom.xml
├── utils/
└── pom.xml
I structured my pom.xml
files as follow: 我的
pom.xml
文件结构如下:
parent-project:pom.xml
<modelVersion>4.0.0</modelVersion>
<groupId>my.project</groupId>
<artifactId>parent-project</artifactId>
<packaging>pom</packaging>
<version>1.0-SNAPSHOT</version>
<modules>
<module>utils</module>
<module>storm-application</module>
</modules>
<build>
<pluginManagement>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
</plugins>
</pluginManagement>
</build>
storm-application:pom.xml
<parent>
<groupId>my.project</groupId>
<artifactId>parent-project</artifactId>
<version>1.0-SNAPSHOT</version>
</parent>
<groupId>my.project.parent-project</groupId>
<artifactId>storm-application</artifactId>
<packaging>jar</packaging>
<dependencies>
<dependency>
<groupId>my.project.parent-project</groupId>
<artifactId>utils</artifactId>
<version>1.0-SNAPSHOT</version>
</dependency>
<dependency> ...storm dependency... </dependency>
</dependencies>
<build>
<sourceDirectory>src/main/java</sourceDirectory>
<testSourceDirectory>src/test/java</testSourceDirectory>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-assembly-plugin</artifactId>
<version>3.1.1</version>
<configuration>
<descriptorRefs>
<descriptorRef>jar-with-dependencies</descriptorRef>
</descriptorRefs>
</configuration>
<executions>
<execution>
<id>make-assembly</id>
<phase>package</phase>
<goals>
<goal>single</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
utils:pom.xml
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>my.project</groupId>
<artifactId>parent-project</artifactId>
<version>1.0-SNAPSHOT</version>
</parent>
<groupId>my.project.parent-project</groupId>
<artifactId>utils</artifactId>
<packaging>jar</packaging>
<dependencies>
... some project related dependencies ...
</dependencies>
<build>
<sourceDirectory>src/main/java</sourceDirectory>
<testSourceDirectory>src/test/java</testSourceDirectory>
</build>
My objective would be to include the sibling module utils
in storm-application
. 我的目标是将同级模块
utils
包含在storm-application
。
I need to include the module utils
directly in the jar
package of the storm-application
module. 我需要将模块
utils
直接包含在storm-application
模块的jar
包中。
In fact, if I run the main function directly from IntelliJ it works, because it recognize the project structure, but if I try to deploy the application with Storm I get this error: 实际上,如果我直接从IntelliJ运行主要功能,则它可以工作,因为它可以识别项目结构,但是如果我尝试使用Storm部署应用程序,则会出现此错误:
Exception in thread "main" java.lang.NoClassDefFoundError: my/project/parent-project/utils/MyClass
at my.project.parent-project.storm-application.MainClass.main(MainClass.java:116)
Caused by: java.lang.ClassNotFoundException: my.project.parent-project.utils.MyClass
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:338)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 1 more
I even tried to use the maven-assembly-plugin
to include all the dependency in the package but I still get the same error. 我什至尝试使用
maven-assembly-plugin
将所有依赖项包含在包中,但仍然出现相同的错误。
Update 更新资料
So what I was missing was that the assembly creates a second jar
on the form name-version-jar-with-dependencies
. 所以我所缺少的是该程序集以
name-version-jar-with-dependencies
的形式创建了另一个jar
。
Plus, the storm dependency should be of <scope>provided</scope>
otherwise it complains. 另外,风暴依赖项应为
<scope>provided</scope>
否则会抱怨。
Still, I'm wondering if there would be an easier way to achieve this inter-module dependency. 不过,我想知道是否会有更简单的方法来实现模块间的依赖性。
I found a cleaner way to do so. 我找到了一种更清洁的方法。 Instead of using the assembly plugin, I use the shade plugin, so that the fat jar keeps the standard name.
我没有使用Assembly插件,而是使用shade插件,以便胖子罐保留标准名称。
Finally, this is the storm-application/pom.xml
that, for me, works: 最后,对我来说,这是
storm-application/pom.xml
:
<parent>
<groupId>my.project</groupId>
<artifactId>parent-project</artifactId>
<version>1.0-SNAPSHOT</version>
</parent>
<groupId>my.project.parent-project</groupId>
<artifactId>storm-application</artifactId>
<packaging>jar</packaging>
<dependencies>
<dependency>
<groupId>my.project.parent-project</groupId>
<artifactId>utils</artifactId>
<version>1.0-SNAPSHOT</version>
</dependency>
<dependency> ...storm dependency... </dependency>
</dependencies>
<build>
<sourceDirectory>src/main/java</sourceDirectory>
<testSourceDirectory>src/test/java</testSourceDirectory>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-shade-plugin</artifactId>
<version>3.2.1</version>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>shade</goal>
</goals>
<configuration>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>
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