You are executing "mvn clean exec:java". This tells Maven, "first clean my project (delete the compiled code), then call exec:java to run my code."
Hopefully you can see why things are not working as you might expect. Hint: you might want to try "mvn clean compile exec:java" to recreate the code as a second step which you just deleted in the first step. Wayne On Mon, Jun 17, 2013 at 10:36 PM, kingsley osime <geekinthel...@gmail.com> wrote: > Hello, > > I get the following error when trying to run simple-service app. my pom is > below error stack > > - thanks > > ********************************************************************************** > > ERROR STACK > penjdk@codeboxIII:~/simple-service$ mvn -e clean exec:java > [INFO] Error stacktraces are turned on. > [INFO] Scanning for projects... > [INFO] > [INFO] > ------------------------------------------------------------------------ > [INFO] Building simple-service 1.0-SNAPSHOT > [INFO] > ------------------------------------------------------------------------ > [INFO] > [INFO] --- maven-clean-plugin:2.3:clean (default-clean) @ simple-service --- > [INFO] > [INFO] >>> exec-maven-plugin:1.2.1:java (default-cli) @ simple-service >>> > [INFO] > [INFO] <<< exec-maven-plugin:1.2.1:java (default-cli) @ simple-service <<< > [INFO] > > [INFO] --- exec-maven-plugin:1.2.1:java (default-cli) @ simple-service --- > [WARNING] > java.lang.ClassNotFoundException: com.example.Main > at java.net.URLClassLoader$1.run(URLClassLoader.java:366) > at java.net.URLClassLoader$1.run(URLClassLoader.java:355) > at java.security.AccessController.doPrivileged(Native Method) > at java.net.URLClassLoader.findClass(URLClassLoader.java:354) > at java.lang.ClassLoader.loadClass(ClassLoader.java:423) > at java.lang.ClassLoader.loadClass(ClassLoader.java:356) > at org.codehaus.mojo.exec.ExecJavaMojo$1.run(ExecJavaMojo.java:285) > at java.lang.Thread.run(Thread.java:722) > [INFO] > ------------------------------------------------------------------------ > [INFO] BUILD FAILURE > [INFO] > ------------------------------------------------------------------------ > [INFO] Total time: 5.572s > [INFO] Finished at: Tue Jun 18 04:22:10 BST 2013 > [INFO] Final Memory: 7M/59M > [INFO] > ------------------------------------------------------------------------ > [ERROR] Failed to execute goal > org.codehaus.mojo:exec-maven-plugin:1.2.1:java (default-cli) on project > simple-service: An exception occured while executing the Java class. > com.example.Main -> [Help 1] > org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute > goal org.codehaus.mojo:exec-maven-plugin:1.2.1:java (default-cli) on project > simple-service: An exception occured while executing the Java class. > com.example.Main > at > org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:217) > 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:84) > at > org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:59) > at > org.apache.maven.lifecycle.internal.LifecycleStarter.singleThreadedBuild(LifecycleStarter.java:183) > at > org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:161) > at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:320) > at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:156) > at org.apache.maven.cli.MavenCli.execute(MavenCli.java:537) > at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:196) > at org.apache.maven.cli.MavenCli.main(MavenCli.java:141) > at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) > at > sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) > at > sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) > at java.lang.reflect.Method.invoke(Method.java:601) > at > org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:290) > at > org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:230) > at > org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:409) > at > org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:352) > Caused by: org.apache.maven.plugin.MojoExecutionException: An exception > occured while executing the Java class. com.example.Main > at > org.codehaus.mojo.exec.ExecJavaMojo.execute(ExecJavaMojo.java:352) > at > org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:101) > at > org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:209) > ... 19 more > Caused by: java.lang.ClassNotFoundException: com.example.Main > at java.net.URLClassLoader$1.run(URLClassLoader.java:366) > at java.net.URLClassLoader$1.run(URLClassLoader.java:355) > at java.security.AccessController.doPrivileged(Native Method) > at java.net.URLClassLoader.findClass(URLClassLoader.java:354) > at java.lang.ClassLoader.loadClass(ClassLoader.java:423) > at java.lang.ClassLoader.loadClass(ClassLoader.java:356) > at org.codehaus.mojo.exec.ExecJavaMojo$1.run(ExecJavaMojo.java:285) > at java.lang.Thread.run(Thread.java:722) > [ERROR] > [ERROR] Re-run Maven using the -X switch to enable full debug logging. > [ERROR] > [ERROR] For more information about the errors and possible solutions, please > read the following articles: > [ERROR] [Help 1] > http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException > > > ************************************************************************** > > POM.XML > > > <project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 > http://maven.apache.org/maven-v4_0_0.xsd";><modelVersion>4.0.0</modelVersion><groupId>com.example</groupId><artifactId>simple-service</artifactId><packaging>jar</packaging><version>1.0-SNAPSHOT</version><name>simple-service</name><dependencyManagement><dependencies><dependency><groupId>org.glassfish.jersey</groupId><artifactId>jersey-bom</artifactId><version>${jersey.version}</version><type>pom</type><scope>import</scope></dependency></dependencies></dependencyManagement><dependencies><dependency><groupId>org.glassfish.jersey.containers</groupId><artifactId>jersey-container-grizzly2-http</artifactId></dependency><!-- > uncomment this to get JSON support: > <dependency> > <groupId>org.glassfish.jersey.media</groupId> > <artifactId>jersey-media-moxy</artifactId> > </dependency> > > --><dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>4.9</version><scope>test</scope></dependency><dependency><groupId>org.glassfish.jersey.core</groupId><artifactId>jersey-client</artifactId><scope>test</scope></dependency></dependencies><build><plugins><plugin><groupId>org.apache.maven.plugins</groupId><artifactId>maven-compiler-plugin</artifactId><version>2.5.1</version><inherited>true</inherited><configuration><source>1.6</source><target>1.6</target></configuration></plugin><plugin><groupId>org.codehaus.mojo</groupId><artifactId>exec-maven-plugin</artifactId><version>1.2.1</version><executions><execution><goals><goal>java</goal></goals></execution></executions><configuration><mainClass>com.example.Main</mainClass></configuration></plugin></plugins></build><properties><jersey.version>2.0</jersey.version><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding></properties></project> > > > > 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