revise compile error.

sharding-jdbc-example/sharding-example/sharding-raw-jdbc-example/pom.xml

@@ -21,5 +21,4 @@
             <artifactId>sharding-jdbc-core</artifactId>
         </dependency>
     </dependencies>
-
 </project>

sharding-jdbc-example/sharding-example/sharding-spring-boot-jpa-example/pom.xml

@@ -5,7 +5,7 @@
     <modelVersion>4.0.0</modelVersion>
     <parent>
         <groupId>io.shardingsphere</groupId>
-        <artifactId>sharding-data-spring-boot</artifactId>
+        <artifactId>sharding-example</artifactId>
         <version>4.0.0-RC1-SNAPSHOT</version>
     </parent>
     <artifactId>sharding-spring-boot-jpa-example</artifactId>

sharding-jdbc-example/sharding-example/sharding-spring-boot-mybatis-example/pom.xml

@@ -5,7 +5,7 @@
     <modelVersion>4.0.0</modelVersion>
     <parent>
         <groupId>io.shardingsphere</groupId>
-        <artifactId>sharding-data-spring-boot</artifactId>
+        <artifactId>sharding-example</artifactId>
         <version>4.0.0-RC1-SNAPSHOT</version>
     </parent>
     <artifactId>sharding-spring-boot-mybatis-example</artifactId>

sharding-jdbc-example/sharding-example/sharding-spring-namespace-jpa-example/pom.xml

@@ -5,7 +5,7 @@
     <modelVersion>4.0.0</modelVersion>
     <parent>
         <groupId>io.shardingsphere</groupId>
-        <artifactId>sharding-data-spring-namespace</artifactId>
+        <artifactId>sharding-example</artifactId>
         <version>4.0.0-RC1-SNAPSHOT</version>
     </parent>
     <artifactId>sharding-spring-namespace-jpa-example</artifactId>

sharding-jdbc-example/sharding-example/sharding-spring-namespace-mybatis-example/pom.xml

@@ -5,7 +5,7 @@
     <modelVersion>4.0.0</modelVersion>
     <parent>
         <groupId>io.shardingsphere</groupId>
-        <artifactId>sharding-data-spring-namespace</artifactId>
+        <artifactId>sharding-example</artifactId>
         <version>4.0.0-RC1-SNAPSHOT</version>
     </parent>
     <artifactId>sharding-spring-namespace-mybatis-example</artifactId>