java - Gradle and Maven compile my project but I am getting NoClassFoundError -

i trying compile project uses gradle , maven. project use library on local maven repository. library referenced in gradle , maven:

gradle:

dependencies{     compile 'cf.charly1811.java.utils:mimetype:1.0' } 

maven:

<!-- dependencies --> <dependencies>     <dependency>         <groupid>cf.charly1811.java.utils</groupid>         <artifactid>mimetype</artifactid>         <version>1.0</version>     </dependency> </dependencies> 

when try compile project using mvn clean package or gradle clean jar success. error arises when mimetype class called:

        exception in thread "thread-4" java.lang.noclassdeffounderror: cf/charly1811/java/utils/mimetype @ cf.charly1811.java.web.requesthandlerthread.process(requesthandlerthread.java:120)             @ cf.charly1811.java.web.requesthandlerthread.handlerequest(requesthandlerthread.java:85)             @ cf.charly1811.java.web.requesthandlerthread.run(requesthandlerthread.java:64)     caused by: java.lang.classnotfoundexception: cf.charly1811.java.utils.mimetype             @ java.net.urlclassloader$1.run(unknown source)             @ java.net.urlclassloader$1.run(unknown source)             @ java.security.accesscontroller.doprivileged(native method)             @ java.net.urlclassloader.findclass(unknown source)             @ java.lang.classloader.loadclass(unknown source)             @ sun.misc.launcher$appclassloader.loadclass(unknown source)             @ java.lang.classloader.loadclass(unknown source)             ... 3 more 

i don't know causing error... please help.

edit: mimetype pom.xml:

<project>     <modelversion>4.0.0</modelversion>     <name>mimetype</name>     <description>library type of file</description>     <groupid>cf.charly1811.java.utils</groupid>     <artifactid>mimetype</artifactid>     <version>1.0</version>      <licenses>         <license>             <name>apache license, version 2.0</name>             <url>http://www.apache.org/licenses/license-2.0.txt</url>             <distribution>repo</distribution>             <comments>a business-friendly oss license</comments>         </license>     </licenses> </project> 

httpserver (main project) pom.xml

<project> <modelversion>4.0.0</modelversion>  <name>httpserver</name> <description>a simple http server written in java</description>  <groupid>cf.charly1811.java.web</groupid> <artifactid>httpserver</artifactid> <version>1.0</version>  <!-- dependencies --> <dependencies>     <dependency>         <groupid>cf.charly1811.java.utils</groupid>         <artifactid>mimetype</artifactid>         <version>1.0</version>     </dependency> </dependencies>  <!-- license --> <licenses>     <license>         <name>private use</name>         <url>http://choosealicense.com/licenses/no-license/</url>         <comments>this software private use only</comments>     </license> </licenses>  <build>     <plugins>         <plugin>             <groupid>org.apache.maven.plugins</groupid>             <artifactid>maven-jar-plugin</artifactid>             <configuration>                 <archive>                     <manifest>                         <addclasspath>true</addclasspath>                         <mainclass>cf.charly1811.java.main</mainclass>                     </manifest>                 </archive>             </configuration>         </plugin>     </plugins> </build>  </project> 

edit forgot clarify 1 thing: use intellij idea. when try compile project using "run" compile , don't error. happen when use gradle or maven compile project

try mvn clean install try compile classes , try save generated jar of project in local repository if problem occurs should able resolve otherwise post see