java - Maven project "maven install" error -

[error] failed execute goal on project xserver-api:  not resolve dependencies project xgroup:xserver-api:war:1.0.1-snapshot:  failed collect dependencies @ xgroup:xserver-lib:jar:1.0.1-snapshot:  failed read artifact descriptor xgroup:xserver-lib:jar:1.0.1-snapshot:  not find artifact xgroup:xserver:pom:1.0.1-snapshot -> [help 1] 

who can me solve problem? thank much!

blow pom file : don't know has problem:

   <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/maven-v4_0_0.xsd">    <modelversion>4.0.0</modelversion>    <name>xserver api</name>  <packaging>war</packaging>  <artifactid>xserver-api</artifactid>    <parent>  	<groupid>xgroup</groupid>  	<artifactid>xserver</artifactid>  	<version>1.0.1-snapshot</version>  </parent>    <properties>  	<javax.servlet-api>3.0.1</javax.servlet-api>  	<javax.servlet-jstl>1.2</javax.servlet-jstl>  	<maven-war-plugin>2.4</maven-war-plugin>  </properties>

here pom of xgroup:xserver-lib.jar:1.0.1-snapshot

<modelversion>4.0.0</modelversion>  <name>xserver lib</name> <packaging>jar</packaging> <artifactid>xserver-lib</artifactid>  <!-- parent --> <parent>     <groupid>xgroup</groupid>     <artifactid>xserver</artifactid>     <version>1.0.1-snapshot</version> </parent>  <!-- properties --> <properties>     <!-- dependencies -->     <javax.servlet-api>3.0.1</javax.servlet-api>     <org.springframework>3.2.13.release</org.springframework>     <org.codehaus.jackson>1.9.7</org.codehaus.jackson>     <org.mybatis-mybatis>3.1.1</org.mybatis-mybatis>     <org.mybatis-mybatis-spring>1.1.1</org.mybatis-mybatis-spring>     <mysql>5.1.20</mysql>     <c3p0>0.9.1.2</c3p0>     <commons-httpclient>3.1</commons-httpclient>     <org.slf4j>1.6.6</org.slf4j>     <log4j>1.2.17</log4j>     <cglib>3.1</cglib>     <commons-net>3.3</commons-net>     <javax.jms>2.0</javax.jms>     <com.rabbitmq>3.4.4</com.rabbitmq>     <activemq>5.9.1</activemq>     <jedis>2.6.0</jedis>     <xmemcached>2.0.0</xmemcached> </properties>  <!-- dependencies --> <dependencies>     <dependency>         <groupid>javax.servlet</groupid>         <artifactid>javax.servlet-api</artifactid>         <version>${javax.servlet-api}</version>         <scope>provided</scope>     </dependency>      <dependency>         <groupid>org.springframework</groupid>         <artifactid>spring-oxm</artifactid>         <version>${org.springframework}</version>         <scope>compile</scope>     </dependency>     <dependency>         <groupid>org.springframework</groupid>         <artifactid>spring-context</artifactid>         <version>${org.springframework}</version>         <scope>compile</scope>     </dependency>     <dependency>         <groupid>org.springframework</groupid>         <artifactid>spring-webmvc</artifactid>         <version>${org.springframework}</version>         <scope>compile</scope>     </dependency>      <dependency>         <groupid>org.codehaus.jackson</groupid>         <artifactid>jackson-mapper-asl</artifactid>         <version>${org.codehaus.jackson}</version>         <scope>compile</scope>     </dependency>      <dependency>         <groupid>org.mybatis</groupid>         <artifactid>mybatis</artifactid>         <version>${org.mybatis-mybatis}</version>         <scope>compile</scope>     </dependency>     <dependency>         <groupid>org.mybatis</groupid>         <artifactid>mybatis-spring</artifactid>         <version>${org.mybatis-mybatis-spring}</version>         <scope>compile</scope>     </dependency>     <dependency>         <groupid>mysql</groupid>         <artifactid>mysql-connector-java</artifactid>         <version>${mysql}</version>         <scope>compile</scope>     </dependency>     <dependency>         <groupid>c3p0</groupid>         <artifactid>c3p0</artifactid>         <version>${c3p0}</version>         <scope>compile</scope>     </dependency>      <dependency>         <groupid>commons-httpclient</groupid>         <artifactid>commons-httpclient</artifactid>         <version>${commons-httpclient}</version>         <scope>compile</scope>     </dependency>      <dependency>         <groupid>org.slf4j</groupid>         <artifactid>slf4j-api</artifactid>         <version>${org.slf4j}</version>         <scope>compile</scope>     </dependency>     <dependency>         <groupid>org.slf4j</groupid>         <artifactid>slf4j-log4j12</artifactid>         <version>${org.slf4j}</version>         <scope>compile</scope>     </dependency>     <dependency>         <groupid>log4j</groupid>         <artifactid>log4j</artifactid>         <version>${log4j} </version>         <scope>compile</scope>     </dependency>      <dependency>         <groupid>cglib</groupid>         <artifactid>cglib</artifactid>         <version>${cglib}</version>     </dependency>      <dependency>         <groupid>commons-net</groupid>         <artifactid>commons-net</artifactid>         <version>${commons-net}</version>         <scope>compile</scope>     </dependency>      <dependency>         <groupid>javax.jms</groupid>         <artifactid>javax.jms-api</artifactid>         <version>${javax.jms}</version>         <scope>compile</scope>     </dependency>     <dependency>         <groupid>org.apache.activemq</groupid>         <artifactid>activemq-all</artifactid>         <version>${activemq}</version>     </dependency>     <dependency>         <groupid>com.rabbitmq</groupid>         <artifactid>amqp-client</artifactid>         <version>${com.rabbitmq}</version>     </dependency>      <dependency>         <groupid>redis.clients</groupid>         <artifactid>jedis</artifactid>         <version>${jedis}</version>         <scope>compile</scope>     </dependency>     <dependency>         <groupid>com.googlecode.xmemcached</groupid>         <artifactid>xmemcached</artifactid>         <version>${xmemcached}</version>         <scope>compile</scope>     </dependency> </dependencies> 

your maven project structure seems broken. if first clean install parent project (which xgroup:xserver:pom:1.0.1-snapshot) , clean install child project , problem fixed. but, better if fix root problem. if post project structure, parent.pom etc. can give more detailed answer.