This will ensure that whenever you call the maven package task, all the dependent library code is also added to the generated fat jar. During Java compilation, Maven adds these dependency library jars  automatically to the classpath. Maven Shade Plugin works by modifying the maven package task. Step 1 – Add Spring boot maven plugin in pom.xml. First step and probably only step required is to have spring-boot-maven-plugin plugin entry in your pom.xml file. Such a jar is know as a fat jar (also called uber jar) since it is substantially larger than the original. Let us modify the pom.xml again to configure an executable jar file. We can use the shade plugin in maven to obtain the single jar file also called as uber/fat jar file that is self-sufficient and can be run independently as it contains all the dependencies and project code inside it. Now try to run our program from the terminal from the console (after switching to target folder), Please enter your name: QPT Maven Shade Plugin works by modifying the maven package task. The second filter demonstrates the use of wildcards for the artifact identity which was introduced in plugin version 1.3. The Maven command to make Maven build the Fat JAR for your project is: mvn clean package Notice the dependency of commons-lang3 library. Such a jar is know as a fat jar (also called uber jar) since it is substantially larger than the original. The jar file is created in the target subfolder. Maven Command to Build Fat JAR. Gradle plugin to create fat/uber JARs, apply file transforms, and relocate packages for applications and libraries. Let us now modify our pom.xnl file to use the apache maven shade plugin. MavenShadeExample-uber.jar: This is fat/uber jar with all dependencies inside it. Such a jar is know as a fat jar (also called uber jar) since it is substantially larger than the original. Shade plugin rewrites the entire byte code under the relocated package. 方法一： 1、对pom.xml的修改，加入插件 org.apache.maven.pl dependency-reduced-pom.xml: This generated maven file is your pom.xml file minus all dependencies. Its very easy and require very few config changes in pom.xml file. Hello QPT. In this maven tutorial, we will learn to create fat jar or uber jar for spring boot applications using maven plugin. For more control, use the Maven Shade Plugin” Following is our main class which uses the third party class StringUtils. This plugin provides the capability to package the artifact in an uber-jar, including its dependencies and to shade - i.e. jar -tvf MavenShadeExample-uber.jar Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/commons/lang3/StringUtils, at com.quickprogrammingtips.demo.shadedemo.App.main(App.java:13), Caused by: java.lang.ClassNotFoundException: org.apache.commons.lang3.StringUtils, at java.net.URLClassLoader.findClass(URLClassLoader.java:381), at java.lang.ClassLoader.loadClass(ClassLoader.java:424), at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331), at java.lang.ClassLoader.loadClass(ClassLoader.java:357). Our program throws a runtime exception since it not able to load the commons-lang3 classes. Using Maven it is possible specify all the third party dependencies of a project. To verify the inclusion of the dependent class files in the fat jar, you can extract the jar and inspect its contents. Please enter your name: QPT 1. Review a Java project. Other entries can be added to the MANIFEST.MF as well via key-value pairs in the section: 2. Verify all classes in generated by running below command. The maven-assembly-plugin should always be executed during the package phase. The manifest is getting created when the jar is created but it does not reference the main class. The advantage of the above approach is that your distributable jars are small. Below Lines are from Assembly Plugin Documentation “If your project wants to package your artifact in an uber-jar, the assembly plugin provides only basic support. Previous Java project ( dateutils) will be reused, see following folder structure. I have copied the shade plugin part of the pom file below. Maven can also be used to package a project as a distributable jar library. It is possible to filter classes or resources from the dependency jars. Previously, we handled this by using the maven-shade-plugin to build a fat JAR. rename - the packages of some of the dependencies. This can be done by simply adding the plugin tag with shade plugin related information as … It is possible to relocate the dependent classes to avoid conflicts with the environment where the jar is running. Apache maven shade plugin also contains a number of. Luckily Maven provides a plugin named Apache Maven Shade Plugin for creating a distributable jar with all the dependencies. This gives fine grained control over how the fat jar is created. Gradle version of Maven's Shade plugin. Now the application works without any runtime errors! This means that in order to run the jar on a different machine, you need to provide all the dependent jars on the classpath. Creating fat-jar/uber-jar using assembly plugin is deprecated, Should be using “maven-shade-plugin” to create fat-jar/uber-jar. The executions XML element tells Maven which Maven build phase and goal this Maven plugin should be executed during. To enable fat jar creation, just add the following xml snippet to your maven pom file. Maven is a popular build tool for Java projects. Following is our original pom file for the project. This is a problem with many cloud java runtime providers such as Amazon Web Services (AWS lambda) which expect the jar to be self contained with all dependencies. Apache maven shade plugin also supports executable jar files. Following is  a simple project which uses Apache commons lang library for string comparison. original-MavenShadeExample-uber.jar: This jar has been generated by executing dependency-reduced-pom.xml. Maven Shade Plugin works by modifying the maven package task. All Rights Reserved. Let us know if you liked the post. This JAR is immutable and has no external dependencies, which makes it easy to deploy and run. Run the following command on the terminal to create the distributable fat jar. | Sitemap, Maven Shade Plugin – UberJar / Fat Jar Example. java -cp shadedemo-0.0.1-SNAPSHOT.jar com.quickprogrammingtips.demo.shadedemo.App. Now you can directly run the jar file without specifying a class name. This takes the application and all of its dependencies and bundles them into one massive JAR. However when you package a project as a jar using maven, the dependent jars are not packaged. Apache maven shade plugin also has support for creating executable jar files. This snippet configures a special resource transformer which sets the Main-Class entry in the MANIFEST.MF of the shaded JAR. Luckily Maven provides a plugin named Apache Maven Shade Plugin for creating a distributable jar with all the dependencies. I am using maven 3.6.1 and maven shade plugin 2.3. Now the run program again with the following command. Luckily Maven provides a plugin named Apache Maven Shade Plugin for creating a distributable jar with all the dependencies. This ensures that a completely private copy of the dependency jar classes are added to the project! Apache Maven Shade Plugin. However the downside is that the application won't run without providing the dependencies explicitly on the classpath. Here, Ant-like patterns are used to specify that from the dependency junit:junit only certain classes/resources should be included in the uber JAR. Following are the major features of Apache Maven Shade Plugin. That’s the only way we can improve. To create an ordinary jar, run the following command on the terminal. Maven Shade plugin is a better plugin to create fat/uber jar, if compare with assembly plugin, because it provides class relocating feature, to avoid same class name conflict in the classpath.

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