"Unable to find main class" with Maven on spring-boot project in Eclipse
EclipseMavenSpring BootEclipse Problem Overview
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.
Eclipse Solutions
Solution 1 - Eclipse
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.
Solution 2 - Eclipse
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.
Solution 3 - Eclipse
You can try adding this in the properties section of your pom
<start-class>your.package.main</start-class>
Solution 4 - Eclipse
if you don't have a main class in springboot project, you can execution spring-boot-maven-plugin by follow
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<configuration>
<skip>true</skip>
</configuration>
</plugin>
</plugins>
</build>
Solution 5 - Eclipse
I had the same problem. It ended being a spring boot mvn plugin declaration on a subproject that does not actually run (no main class). I just removed the spring boot mvn plugin from the submodule and everything ran fine
Solution 6 - Eclipse
add property to maven properties like this
<properties>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
<start-class>org.roshan.Application</start-class>
</properties>
Solution 7 - Eclipse
In project agiletunes-util pom.xml add
<properties>
<spring-boot.repackage.skip>true</spring-boot.repackage.skip>
</properties>
Solution 8 - Eclipse
I had a similar problem in the pom.xml created for separating my data model into a new module.
Reading this tread I discovered I had accidentally put the <configuration><skip>true</skip></configuration> inside the <executions> block. Below is my corrected pom.xml build section. FYI, there is no <packaging> entry in my pom.xml.
Using Ubuntu 20.04 LTS, Java 11.0.7, maven 3.6.3, Spring Starter 2.3.2.RELEASE, IntelliJ 2020.2
Working build configuration for pom.xml of my data model module
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<executions>
<execution>
<goals>
<goal>repackage</goal>
</goals>
</execution>
</executions>
<configuration>
<skip>true</skip>
</configuration>
</plugin>
</plugins>
</build>
Solution 9 - Eclipse
I solved that,
Add the following code to pom file,
<profiles>
<profile>
<id>profile1</id>
<properties>
<spring.boot.mainclass>com.detaysoft.Application</spring.boot.mainclass>
</properties>
</profile>
</profiles>
Then build the build tag as follows,
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<executions>
<execution>
<goals>
<goal>repackage</goal>
</goals>
<configuration>
<mainClass>${spring.boot.mainclass}</mainClass>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>
Solution 10 - Eclipse
Wouldn't you simply tell it by using the annotation @SpringBootApplication?
> Many Spring Boot developers always have their main class annotated with @Configuration, @EnableAutoConfiguration and @ComponentScan. Since these annotations are so frequently used together (especially if you follow the best practices above), Spring Boot provides a convenient @SpringBootApplication alternative.
Solution 11 - Eclipse
I was also facing the same issue is resolved by adding <id>repackage</id>.
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<executions>
<execution>
<id>repackage</id>
<goals>
<goal>repackage</goal>
</goals>
<configuration>
<skip>true</skip>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
Solution 12 - Eclipse
I also stumbled across this issue, and it turned out that packaging type was wrong. When I changed packaging from pom to jar, everything started to work correctly.
Solution 13 - Eclipse
If you have multi modules maven project, as first workaround simply disable repackage to avoid this exception :
<properties>
<spring-boot.repackage.skip>true</spring-boot.repackage.skip>
</properties>
Other workarouds :
<executions>
<execution>
<goals>
<goal>repackage</goal>
</goals>
</execution>
</executions>
<configuration>
<skip>true</skip>
</configuration>
As solution:
<properties>
<spring.boot.mainclass>ir.shaparak.Application</spring.boot.mainclass>
</properties>
Another solution: In parent POM do as follows:
<build>
<pluginManagement>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</pluginManagement>
</build>
In sub modules(runable moudles) should be as follows
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
Solution 14 - Eclipse
In my case I had to add the "sourceDirectory" and my pom.xml changed from:
...
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
...
to
...
<build>
<sourceDirectory>src</sourceDirectory>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
...
Solution 15 - Eclipse
In my case, I had a code source file named java even though I was explicitly using kotlin:
<sourceDirectory>${project.basedir}/src/main/kotlin</sourceDirectory>
<testSourceDirectory>${project.basedir}/src/test/kotlin</testSourceDirectory>
Solution 16 - Eclipse
With Maven you can tell which is the main class by:
<build>
<plugins>
<plugin>
<configuration>
<mainClass>com.xxx.yyy.mainApplication<mainClass>
<configuration>
<plugin>
<plugins>
</build>
Solution 17 - Eclipse
I had the same issue for multi module project and I added
<mainClass>package-name-in-which-main-method-resides</mainClass> and it worked.
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<configuration>
<mainClass>package-name-where-@SpringBootApplication-main-method-is(com.agiletunes)</mainClass>
</configuration>
</plugin>
</plugins>
</build>
Solution 18 - Eclipse
If you manually build your Sprint Boot project by using maven then make sure your project has a class like " class Application extends SpringBootServletInitializer " with main method in that.
Solution 19 - Eclipse
In my case, I had missed bellow tag in progect pom:
<packaging>jar</packaging>
or
<packaging>war</packaging>
so, I added and it worked fine.
Solution 20 - Eclipse
In my case, I had a kotlin project but the src dir was named java instead of kotlin by the IDE. refactoring the name fixed the issue.
Solution 21 - Eclipse
under
<artifactId></artifactId>
tag write this property
<properties>
<spring-boot.repackage.skip>true</spring-boot.repackage.skip>
</properties>
it is helped me
Solution 22 - Eclipse
I also had same issue, and solved by adding Application class as
@SpringBootApplication
public class Application {
public static void main(String[] args) {
SpringApplication.run(Application.class, args);
}
}
i missed adding application start point during configuration of project.
Solution 23 - Eclipse
There are 2 ways to solve the issue:
- Create Main class:
public class Main {public static void main(String[] args){}}
- Remove plugin from pom.xml:
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>