Spark——最简单明了的Java Web框架（2）

上一篇简单介绍了Spark Hello World，这一篇主要记录一下怎么获得Spark Java源代码，导入Eclipse，并且用Maven执行。

1、从github checkout 源代码

$git clone git://github.com/perwendel/spark.git

2、把这个项目Eclipse化

$cd spark
$mvn eclipse:eclipse -Dwtpversion=2.0  

这时候可以打开Eclipse，import Existing project，Eclipse的Import Wizard应该可以识别spark是个Eclipse项目。

3、执行Maven build

$mvn clean install

如果这一步失败在

[ERROR] COMPILATION ERROR : 
[INFO] -------------------------------------------------------------
[ERROR] Failure executing javac, but could not parse the error:
javac: invalid target release: 1.7
Usage: javac <options> <source files>
use -help for a list of possible options

[INFO] 1 error
[INFO] -------------------------------------------------------------
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 1.283s
[INFO] Finished at: Mon Apr 15 17:12:45 EDT 2013
[INFO] Final Memory: 5M/81M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:2.3.2:compile (default-compile) on project spark-core: Compilation failure
[ERROR] Failure executing javac, but could not parse the error:
[ERROR] javac: invalid target release: 1.7
[ERROR] Usage: javac <options> <source files>
[ERROR] use -help for a list of possible options
[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

原因是spark需要Java jdk 1.7，没有的可以去Oracle官网下载。

$java -version
java version "1.7.0_17"
Java(TM) SE Runtime Environment (build 1.7.0_17-b02)
Java HotSpot(TM) 64-Bit Server VM (build 23.7-b01, mixed mode)

之后再执行

$mvn clean install

应该可以顺利download dependency，执行compile，test，package，生成一个spark jar。