maven 强制jdk的版本

<build>
	<plugins>
		<plugin>
		<groupId>org.apache.maven.plugins</groupId>
		<artifactId>maven-enforcer-plugin</artifactId>
		<version>1.2</version>
		<executions>
			<execution>
			<id>enforce-versions</id>
			<goals>
				<goal>enforce</goal>
			</goals>
			<configuration>
				<rules>
					<requireMavenVersion>
						<version>2.0.6</version>
					</requireMavenVersion>
					<requireJavaVersion>
						<version>1.5</version>
					</requireJavaVersion>
					<requireOs>
						<family>unix</family>
					</requireOs>
				</rules>
			</configuration>
			</execution>
		</executions>
		</plugin>
	</plugins>
</build>