[Maven] Fix some mistake in fe/pom.xml (#2818)

fe/pom.xml

@@ -37,6 +37,7 @@ under the License.
         <maven.compiler.source>1.8</maven.compiler.source>
         <maven.compiler.target>1.8</maven.compiler.target>
         <jprotobuf.version>2.2.11</jprotobuf.version>
+        <skip.plugin>false</skip.plugin>
     </properties>
 
     <profiles>
@@ -613,7 +614,7 @@ under the License.
                             <goal>exec</goal>
                         </goals>
                         <configuration>
-                            <executable>${env.JAVA_HOME}/bin/java</executable>
+                            <executable>${java.home}/bin/java</executable>
                             <arguments>
                                 <argument>-jar</argument>
                                 <argument>${settings.localRepository}/com/baidu/jprotobuf/${jprotobuf.version}/jprotobuf-${jprotobuf.version}-jar-with-dependencies.jar</argument>
@@ -643,7 +644,6 @@ under the License.
                                 <!-- add arbitrary num of src dirs here -->
                                 <source>${palo.home}/gensrc/build/java/</source>
                             </sources>
-                            <skip>${skip.plugin}</skip>
                         </configuration>
                     </execution>
                 </executions>
@@ -677,7 +677,9 @@ under the License.
                 <artifactId>cobertura-maven-plugin</artifactId>
                 <version>2.7</version>
                 <configuration>
-                    <cobertura.maxmem>1024m</cobertura.maxmem>
+                    <check>
+                        <maxmem>1024m</maxmem>
+                    </check>
                 </configuration>
             </plugin>