"Unable to find main class" with Maven on spring-boot project in Eclipse

Question

I am pretty desperate since I no longer can compile my Maven projects. I have one logical project split into 7 maven modules which so far compiled fine, but today I introduced a feature, whereby I accidentally generated a circular maven dependency. Therefore I refactored the code and eliminated the circular dependency. Ever since I updated the pom files to reflect the fix my project doesn't build anymore. When I run maven with "-X clean install" I get the following java.lang.IllegalStateException: Unable to find main class

[INFO] Error stacktraces are turned on. [INFO] Scanning for projects... [INFO] ------------------------------------------------------------------------ [INFO] Reactor Build Order: [INFO]  [INFO] agiletunes-parent [INFO] agiletunes-util [INFO] agiletunes-security-common [INFO] agiletunes-marketing-persistence [INFO] agiletunes-common-ui [INFO] agiletunes-security-client [INFO] agiletunes-marketing-application [INFO] agiletunes-security-server [INFO]                                                                          [INFO] ------------------------------------------------------------------------ [INFO] Building agiletunes-parent 0.0.1 [INFO] ------------------------------------------------------------------------ [INFO]  [INFO] --- spring-boot-maven-plugin:1.5.2.RELEASE:repackage (default) @ agiletunes-parent --- [INFO]  [INFO] --- maven-install-plugin:2.5.2:install (default-install) @ agiletunes-parent --- [INFO] Installing C:\Users\Alexander\Documents\Development\agileTunes\agiletunes-parent\pom.xml to C:\Users\Alexander\Documents\Development\mavenArtifacts\com\agiletunes\agiletunes-parent\0.0.1\agiletunes-parent-0.0.1.pom [INFO]                                                                          [INFO] ------------------------------------------------------------------------ [INFO] Building agiletunes-util 0.0.1 [INFO] ------------------------------------------------------------------------ [INFO]  [INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ agiletunes-util --- [INFO] Using 'UTF-8' encoding to copy filtered resources. [INFO] skip non existing resourceDirectory C:\Users\Alexander\Documents\Development\agileTunes\agiletunes-util\src\main\resources [INFO] skip non existing resourceDirectory C:\Users\Alexander\Documents\Development\agileTunes\agiletunes-util\src\main\resources [INFO]  [INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ agiletunes-util --- [INFO] Nothing to compile - all classes are up to date [INFO]  [INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) @ agiletunes-util --- [INFO] Not copying test resources [INFO]  [INFO] --- maven-compiler-plugin:3.1:testCompile (default-testCompile) @ agiletunes-util --- [INFO] Not compiling test sources [INFO]  [INFO] --- maven-surefire-plugin:2.18.1:test (default-test) @ agiletunes-util --- [INFO] Tests are skipped. [INFO]  [INFO] --- maven-jar-plugin:2.6:jar (default-jar) @ agiletunes-util --- [INFO]  [INFO] --- spring-boot-maven-plugin:1.5.2.RELEASE:repackage (default) @ agiletunes-util --- [INFO] ------------------------------------------------------------------------ [INFO] Reactor Summary: [INFO]  [INFO] agiletunes-parent .................................. SUCCESS [  1.492 s] [INFO] agiletunes-util .................................... FAILURE [  1.095 s] [INFO] agiletunes-security-common ......................... SKIPPED [INFO] agiletunes-marketing-persistence ................... SKIPPED [INFO] agiletunes-common-ui ............................... SKIPPED [INFO] agiletunes-security-client ......................... SKIPPED [INFO] agiletunes-marketing-application ................... SKIPPED [INFO] agiletunes-security-server ......................... SKIPPED [INFO] ------------------------------------------------------------------------ [INFO] BUILD FAILURE [INFO] ------------------------------------------------------------------------ [INFO] Total time: 3.674 s [INFO] Finished at: 2017-03-21T21:53:04+01:00 [INFO] Final Memory: 31M/309M [INFO] ------------------------------------------------------------------------ [ERROR] Failed to execute goal org.springframework.boot:spring-boot-maven-plugin:1.5.2.RELEASE:repackage (default) on project agiletunes-util: Execution default of goal org.springframework.boot:spring-boot-maven-plugin:1.5.2.RELEASE:repackage failed: Unable to find main class -> [Help 1] org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.springframework.boot:spring-boot-maven-plugin:1.5.2.RELEASE:repackage (default) on project agiletunes-util: Execution default of goal org.springframework.boot:spring-boot-maven-plugin:1.5.2.RELEASE:repackage failed: Unable to find main class     at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:212)     at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)     at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)     at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:116)     at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:80)     at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build(SingleThreadedBuilder.java:51)     at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:128)     at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:307)     at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:193)     at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:106)     at org.apache.maven.cli.MavenCli.execute(MavenCli.java:863)     at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:288)     at org.apache.maven.cli.MavenCli.main(MavenCli.java:199)     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)     at java.lang.reflect.Method.invoke(Method.java:498)     at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:289)     at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:229)     at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:415)     at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:356) Caused by: org.apache.maven.plugin.PluginExecutionException: Execution default of goal org.springframework.boot:spring-boot-maven-plugin:1.5.2.RELEASE:repackage failed: Unable to find main class     at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:145)     at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:207)     ... 20 more Caused by: java.lang.IllegalStateException: Unable to find main class     at org.springframework.boot.loader.tools.Repackager.buildManifest(Repackager.java:354)     at org.springframework.boot.loader.tools.Repackager.repackage(Repackager.java:273)     at org.springframework.boot.loader.tools.Repackager.repackage(Repackager.java:258)     at org.springframework.boot.loader.tools.Repackager.repackage(Repackager.java:190)     at org.springframework.boot.maven.RepackageMojo.repackage(RepackageMojo.java:212)     at org.springframework.boot.maven.RepackageMojo.execute(RepackageMojo.java:199)     at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:134)     ... 21 more [ERROR]  ... 

This is the pom.xml of my maven parent project:

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion>  <groupId>com.agiletunes</groupId> <artifactId>agiletunes-parent</artifactId> <version>0.0.1</version>  <packaging>pom</packaging> <name>agiletunes-parent</name> <description>Maven parent project of agiletunes</description>  <parent>     <groupId>org.springframework.boot</groupId>     <artifactId>spring-boot-starter-parent</artifactId>     <version>1.5.2.RELEASE</version>     <relativePath></relativePath> </parent>  <modules>     <module>../agiletunes-common-ui</module>     <module>../agiletunes-marketing-application</module>     <module>../agiletunes-marketing-persistence</module>     <module>../agiletunes-security-client</module>     <module>../agiletunes-security-common</module>     <module>../agiletunes-security-server</module>     <module>../agiletunes-util</module> </modules>  <properties>     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>      <!-- Java -->     <java.version>1.8</java.version>      <!-- Spring -->     <spring.boot.version>1.5.2.RELEASE</spring.boot.version>      <!-- persistence -->     <mysql-connector-java.version>6.0.5</mysql-connector-java.version>      <!-- util -->     <guava.version>17.0</guava.version>      <!-- testing -->     <mockito.version>1.9.5</mockito.version>  </properties>  <dependencies>      <!-- Spring -->     <dependency>         <groupId>org.springframework.boot</groupId>         <artifactId>spring-boot-starter-data-jpa</artifactId>     </dependency>     <dependency>         <groupId>mysql</groupId>         <artifactId>mysql-connector-java</artifactId>         <version>${mysql-connector-java.version}</version><!--$NO-MVN-MAN-VER$ -->         <scope>runtime</scope>     </dependency>      <!-- utils -->     <dependency>         <groupId>com.google.guava</groupId>         <artifactId>guava</artifactId>         <version>${guava.version}</version>     </dependency>      <!-- unit test framework -->     <dependency>         <groupId>org.springframework.boot</groupId>         <artifactId>spring-boot-starter-test</artifactId>         <scope>test</scope>     </dependency>      <dependency>         <groupId>org.mockito</groupId>         <artifactId>mockito-core</artifactId>         <version>${mockito.version}</version>         <scope>test</scope>     </dependency>  </dependencies>  <build>     <plugins>         <plugin>             <groupId>org.springframework.boot</groupId>             <artifactId>spring-boot-maven-plugin</artifactId>         </plugin>     </plugins> </build> 

What do I need to do, to fix this? Please let me know, should you need additional information. Thank you in advance.

Answer 1

You should have this

<build>     <plugins>         <plugin>             <groupId>org.springframework.boot</groupId>             <artifactId>spring-boot-maven-plugin</artifactId>         </plugin>     </plugins> </build> 

only in those modules that you want to run, but not in the parent pom.

Answer 2

Just for someone who faced with similar problem. I added spring-boot-maven-plugin in parent POM in section pluginManagement section like this:

 <build>     <pluginManagement>         <plugins>             <plugin>                 <groupId>org.springframework.boot</groupId>                 <artifactId>spring-boot-maven-plugin</artifactId>             </plugin>         </plugins>     </pluginManagement> </build> 

Then I added the plugin only in the modules using it (in plugin section).The project has been successfully built after that.