spring - Failed to execute goal org.codehaus.mojo:exec-maven-plugin:1.5.0:java (default-cli) on project nextrtc-signaling-serverrror -

i tested nextrtc-signaling-server opensource java. encountered building maven problem. hope solved.

my console log.

 [info] building jar: d:\signallinserver\nextrtc-signaling-server\target\nextrtc-signaling-server-0.0.4-snapshot-javadoc.jar  [info]   [info] --- exec-maven-plugin:1.5.0:java (default-cli) @ nextrtc-signaling-server ---  [info] ------------------------------------------------------------------------  [info] build failure  [info] ------------------------------------------------------------------------  [info] total time: 12.430 s  [info] finished at: 2016-08-29t11:12:34+09:00  [info] final memory: 26m/223m  [info] ------------------------------------------------------------------------  [error] failed execute goal org.codehaus.mojo:exec-maven-plugin:1.5.0:java (default-cli) on project nextrtc-signaling-server: parameters 'mainclass' goal org.codehaus.mojo:exec-maven-plugin:1.5.0:java missing or invalid -> [help 1]  [error]   [error] see full stack trace of errors, re-run maven -e switch.  [error] re-run maven using -x switch enable full debug logging.  [error]   [error] more information errors , possible solutions, please read following articles:  [error] [help 1]  http://cwiki.apache.org/confluence/display/maven/pluginparameterexception 

pom.xml

http://maven.apache.org/xsd/maven-4.0.0.xsd"> 4.0.0

<groupid>org.nextrtc.signalingserver</groupid> <artifactid>nextrtc-signaling-server</artifactid> <version>0.0.4-snapshot</version> <packaging>jar</packaging>  <name>nextrtc-signaling-server</name> <url>http://nextrtc.org</url> <description>library providing signaling protocol webrtc</description>  <licenses>     <license>         <name>mit license</name>         <url>http://www.opensource.org/licenses/mit-license.php</url>     </license> </licenses>  <developers>     <developer>         <name>marcin Ślósarz</name>         <email>m.slosarz@ahej.pl</email>         <organization>nextrtc</organization>         <organizationurl>http://nextrtc.org</organizationurl>     </developer> </developers>  <issuemanagement>     <url>https://github.com/mslosarz/nextrtc-signaling-server/issues</url>     <system>github issues</system> </issuemanagement>  <scm>     <connection>scm:git:https://github.com/mslosarz/nextrtc-signaling-server.git</connection>     <developerconnection>scm:git:git@github.com:mslosarz/nextrtc-signaling-server.git</developerconnection>     <url>https://github.com/mslosarz/nextrtc-signaling-server</url> </scm>  <properties>     <project.build.sourceencoding>utf-8</project.build.sourceencoding>     <maven.compiler.source>1.8</maven.compiler.source>     <maven.compiler.target>1.8</maven.compiler.target>     <spring-version>4.2.4.release</spring-version> </properties>  <distributionmanagement>     <snapshotrepository>         <id>ossrh</id>         <url>https://oss.sonatype.org/content/repositories/snapshots</url>     </snapshotrepository>     <repository>         <id>ossrh</id>         <url>https://oss.sonatype.org/service/local/staging/deploy/maven2/</url>     </repository> </distributionmanagement>  <build>     <plugins>         <plugin>             <groupid>org.apache.maven.plugins</groupid>             <artifactid>maven-compiler-plugin</artifactid>             <version>3.1</version>         </plugin>         <plugin>             <groupid>org.apache.maven.plugins</groupid>             <artifactid>maven-source-plugin</artifactid>             <version>2.2.1</version>             <executions>                 <execution>                     <id>attach-sources</id>                     <goals>                         <goal>jar</goal>                     </goals>                 </execution>             </executions>         </plugin>         <plugin>             <groupid>org.apache.maven.plugins</groupid>             <artifactid>maven-gpg-plugin</artifactid>             <version>1.5</version>             <executions>                 <execution>                     <id>sign-artifacts</id>                     <phase>verify</phase>                     <goals>                         <goal>sign</goal>                     </goals>                 </execution>             </executions>         </plugin>         <plugin>             <groupid>org.apache.maven.plugins</groupid>             <artifactid>maven-javadoc-plugin</artifactid>             <version>2.9.1</version>             <executions>                 <execution>                     <id>attach-javadocs</id>                     <goals>                         <goal>jar</goal>                     </goals>                 </execution>             </executions>         </plugin>     </plugins> </build>  <dependencies>     <dependency>         <groupid>org.springframework</groupid>         <artifactid>spring-context</artifactid>         <version>${spring-version}</version>     </dependency>     <dependency>         <groupid>org.springframework</groupid>         <artifactid>spring-websocket</artifactid>         <version>${spring-version}</version>     </dependency>     <dependency>         <groupid>log4j</groupid>         <artifactid>log4j</artifactid>         <version>1.2.17</version>     </dependency>     <dependency>         <groupid>joda-time</groupid>         <artifactid>joda-time</artifactid>         <version>2.9.2</version>     </dependency>     <dependency>         <groupid>javax.websocket</groupid>         <artifactid>javax.websocket-api</artifactid>         <version>1.1</version>         <scope>provided</scope>     </dependency>     <dependency>         <groupid>javax.servlet</groupid>         <artifactid>javax.servlet-api</artifactid>         <version>3.1.0</version>         <scope>provided</scope>     </dependency>     <dependency>         <groupid>org.projectlombok</groupid>         <artifactid>lombok</artifactid>         <version>1.16.6</version>         <scope>provided</scope>     </dependency>     <dependency>         <groupid>com.google.guava</groupid>         <artifactid>guava</artifactid>         <version>19.0</version>     </dependency>     <dependency>         <groupid>com.google.code.gson</groupid>         <artifactid>gson</artifactid>         <version>2.5</version>     </dependency>     <dependency>         <groupid>org.apache.commons</groupid>         <artifactid>commons-lang3</artifactid>         <version>3.4</version>     </dependency>     <dependency>         <groupid>com.googlecode.zohhak</groupid>         <artifactid>zohhak</artifactid>         <version>1.1.1</version>         <scope>test</scope>     </dependency>     <dependency>         <groupid>org.mockito</groupid>         <artifactid>mockito-core</artifactid>         <version>1.10.19</version>         <scope>test</scope>         <exclusions>             <exclusion>                 <artifactid>hamcrest-core</artifactid>                 <groupid>org.hamcrest</groupid>             </exclusion>         </exclusions>     </dependency>     <dependency>         <groupid>org.springframework</groupid>         <artifactid>spring-test</artifactid>         <version>${spring-version}</version>         <scope>test</scope>     </dependency>     <dependency>         <groupid>junit</groupid>         <artifactid>junit</artifactid>         <version>4.12</version>         <scope>test</scope>         <exclusions>             <exclusion>                 <groupid>org.hamcrest</groupid>                 <artifactid>hamcrest-core</artifactid>             </exclusion>         </exclusions>     </dependency>     <dependency>         <groupid>org.hamcrest</groupid>         <artifactid>hamcrest-all</artifactid>         <version>1.3</version>         <scope>test</scope>     </dependency> </dependencies> 

i've built source @ "clean package exec: java" (maven goals)

what have do? want fix it.

you can build nextrtc-signaling-server project (https://github.com/mslosarz/nextrtc-signaling-server) using below command.

mvn clean package 

if there main class (for example mysampleapplication.java) in project package (for example com.sample.my) can run using below command.

mvn exec:java -dexec.mainclass="com.sample.my.mysampleapplication" 

if want develop new application using "nextrtc-signaling-server" add below maven dependency in maven project. please refer https://nextrtc.org/archives/85

<dependency>    <groupid>org.nextrtc.signalingserver</groupid>    <artifactid>nextrtc-signaling-server</artifactid>    <version>0.0.3</version> </dependency>