Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:2.3.2:该如何解决

[INFO] ------------------------------------------------------------------------[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:2.3.2:compile (default-compile) on project clothing: Compilation failure[ERROR] Unable to locate the Javac Compiler in:[ERROR] C:\Program Files\Java\jre6\..\lib\tools.jar[ERROR] Please ensure you are using JDK 1.4 or above and[ERROR] not a JRE (the com.sun.tools.javac.Main class is required).[ERROR] In most cases you can change the location of your Java[ERROR] installation by setting the JAVA_HOME environment variable.[ERROR] -> [Help 1][ERROR] [ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.[ERROR] Re-run Maven using the -X switch to enable full debug logging.[ERROR] [ERROR] For more information about the errors and possible solutions, please read the following articles:[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoFailureException

    <build>        <plugins>            <plugin>                <groupId>org.apache.maven.plugins</groupId>                <artifactId>maven-compiler-plugin</artifactId>                <version>2.3.2</version>                <configuration>                    <source>1.6</source>                    <target>1.6</target>                    <encoding>UTF-8</encoding>                </configuration>            </plugin>            <plugin>                <groupId>org.apache.maven.plugins</groupId>                <artifactId>maven-war-plugin</artifactId>                <version>2.1.1</version>                <configuration>                    <warName>test</warName>                </configuration>            </plugin>            <plugin>                <groupId>org.apache.maven.plugins</groupId>                <artifactId>maven-dependency-plugin</artifactId>                <executions>                    <execution>                        <id>install</id>                        <phase>install</phase>                        <goals>                            <goal>sources</goal>                        </goals>                    </execution>                </executions>            </plugin>            <plugin>                <groupId>org.mortbay.jetty</groupId>                <artifactId>maven-jetty-plugin</artifactId>                <version>6.1.10</version>                <configuration>                    <scanIntervalSeconds>0</scanIntervalSeconds>                    <stopKey>foo</stopKey>                    <stopPort>9999</stopPort>                </configuration>                <executions>                    <execution>                        <id>start-jetty</id>                        <phase>pre-integration-test</phase>                        <goals>                            <goal>run</goal>                        </goals>                        <configuration>                            <scanIntervalSeconds>0</scanIntervalSeconds>                            <daemon>true</daemon>                        </configuration>                    </execution>                </executions>            </plugin>        </plugins>    </build>