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

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