There error message in question is
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-shade-plugin:3.1.0:shade (default) on project myapp-core: Error creating shaded jar: null: IllegalArgumentException -> [Help 1] from mvn package in the myapp-core folder. mvn clean and mvn compile work fine. My project structure is
myapp/ myapp-acceptance-tests/ myapp-core/ pom.xml pom.xml And myapp/pom.xml is defined by
<groupId>com.myself.myapp</groupId> <artifactId>myapp</artifactId> <packaging>pom</packaging> <version>1.0-SNAPSHOT</version> <modules> <module>myapp-core</module> <module>myapp-acceptance-tests</module> </modules> <properties> <maven.compiler.source>10</maven.compiler.source> <maven.compiler.target>10</maven.compiler.target> </properties> <dependencies> ... </dependencies> And myapp/myapp-core/pom.xml is defined by
<artifactId>myapp-core</artifactId> <packaging>jar</packaging> <build> <plugins> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-jar-plugin</artifactId> <configuration> <archive> <manifest> <addClasspath>true</addClasspath> <mainClass>myself.myapp.Main</mainClass> </manifest> </archive> </configuration> </plugin> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-compiler-plugin</artifactId> <configuration> <source>10</source> <target>10</target> </configuration> </plugin> <plugin> <groupId>org.apache.tomcat.maven</groupId> <artifactId>tomcat7-maven-plugin</artifactId> <version>2.2</version> <configuration> <server>mytomcat7</server> <path>/</path> </configuration> </plugin> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-shade-plugin</artifactId> <version>3.1.0</version> <executions> <execution> <phase>package</phase> <goals> <goal>shade</goal> </goals> <configuration> <shadedArtifactAttached>true</shadedArtifactAttached> <shadedClassifierName>shaded</shadedClassifierName> <minimizeJar>true</minimizeJar> </configuration> </execution> </executions> </plugin> </plugins> </build> - It is a much later version than the upgrade the version fix found in this question
- the plugin is in the submodule pom rather than the parent pom as is the mistake here
- and I have tried removing
<packaging>jar</packaging>to no avail.
What does maven-shade-plugin need to successfully create the shaded jar?
EDIT: setting minimizeJar to false solves my problem, but why? Is there a better way, or a way to get the benefits of a minimised jar?
