本文讲解如何在windows下使用maven编译，以及如何在windows下执行
1、下载 flume 的源文件，地址：http://www.apache.org/dyn/closer.cgi/flume/1.5.0.1/apache-flume-1.5.0.1-src.tar.gz
2、本地安装maven环境
3、切换到源文件路径下执行：mvn clean
mvn package -DskipTests // -DskipTests 使编译跳过测试，不然会报错
4、提示编译成功后，会在*\flume-ng-dist\target 目录下产生文件：apache-flume-1.5.0.1-bin、 apache-flume-1.5.0.1-bin.tar.gz、apache-flume-1.5.0.1-src、apache-flume-1.5.0.1-src.tar.gz，apache-flume-1.5.0.1-bin下的文件就可以用了
5、编译后，发现生成的仍然是linux下的脚本，无法再windows下执行，没关系，只要自己加上windows的执行脚本就行了，简单的脚本示例如下：
rem flume 1.5.0.1 windows script.
set FLUME_HOME=D:\java\apache-flume-1.5.0.1-bin
set JAVA="D:\java\JDK6_2\bin\java.exe"
set JAVA_OPTS=-Xmx60m
set CONF=%FLUME_HOME%\conf\kafka.properties
set AGENT=kafka
%JAVA% %JAVA_OPTS% -Dlog4j.configuration=file:
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6、可能遇到的问题：
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:2.
3.2:testCompile (default-testCompile) on project flume-ng-elasticsearch-sink: Co
mpilation failure
[ERROR] Failure executing javac, but could not parse the error:
[ERROR]
[ERROR]
[ERROR] 系统资源不足。
[ERROR] 有关详细信息, 请参阅以下堆栈跟踪。
[ERROR] java.lang.OutOfMemoryError: PermGen space
[ERROR] at java.lang.ClassLoader.defineClass1(Native Method)
[ERROR] at java.lang.ClassLoader.defineClass(ClassLoader.java:791)
[ERROR] at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:14
2)
……
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当Maven项目很大时，maven运行需要很大的内存，在默认配置下，就可能遇到java的堆溢出，这时指定分配内存大小
windows环境下：找到maven目录\bin\mvn.bat文件，编辑，在行
@REM set MAVEN_OPTS=-Xdebug -Xnoagent -Djava.compiler=NONE... 下设置
set MAVEN_OPTS= -Xms512m -Xmx1024m -XX:PermSize=256m -XX:MaxPermSize=512m
linux环境下：设置环境变量，编辑/etc/profile 增加
export MAVEN_OPTS=-Xmx512m
[ERROR] Failed to execute goal on project flume-ng-morphline-solr-sink: Could no
t resolve dependencies for project org.apache.flume.flume-ng-sinks:flume-ng-morp
hline-solr-sink:jar:1.5.0.1: The following artifacts could not be resolved: net.
sf.saxon:Saxon-HE:jar:9.5.1-4, ua_parser:ua-parser:jar:1.3.0: Could not transfer
artifact net.sf.saxon:Saxon-HE:jar:9.5.1-4 from/to nexus (http:
exus/content/groups/public): Error transferring file: Server returned HTTP respo
nse code: 502 for URL: http:
xon/Saxon-HE/9.5.1-4/Saxon-HE-9.5.1-4.jar -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e swit
ch.
[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 rea
d the following articles:
[ERROR] [Help 1] http:
lutionException
[ERROR]
[ERROR] After correcting the problems, you can resume the build with the command
[ERROR] mvn <goals> -rf :flume-ng-morphline-solr-sink
……
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这个包比较大，重试几把就行了
[ERROR] Failed to execute goal on project flume-ng-morphline-solr-sink: Could no
t resolve dependencies for project org.apache.flume.flume-ng-sinks:flume-ng-morp
hline-solr-sink:jar:1.5.0.1: Failure to find ua_parser:ua-parser:jar:1.3.0 in ht
tp:
, resolution will not be reattempted until the update interval of nexus has elap
sed or updates are forced -> [Help 1]
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal o
n project flume-ng-morphline-solr-sink: Could not resolve dependencies for proje
ct org.apache.flume.flume-ng-sinks:flume-ng-morphline-solr-sink:jar:1.5.0.1: Fai
lure to find ua_parser:ua-parser:jar:1.3.0 in http:
groups/public was cached in the local repository, resolution will not be reattem
pted until the update interval of nexus has elapsed or updates are forced
at org.apache.maven.lifecycle.internal.LifecycleDependencyResolver.getDe
pendencies(LifecycleDependencyResolver.java:196)
at org.apache.maven.lifecycle.internal.LifecycleDependencyResolver.resol
veProjectDependencies(LifecycleDependencyResolver.java:108)
at org.apache.maven.lifecycle.internal.MojoExecutor.ensureDependenciesAr
eResolved(MojoExecutor.java:258)
……
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这个问题搞了好一会，试了几种方法，没搞定。
发现它是对flume-ng-morphline-solr-sink的编译，需要依赖 ua_parser:ua-parser:jar:1.3.0，变通一点，先绕过它再说，在*\apache-flume-1.5.0.1-src\flume-ng-sinks\pom.xml 中，
注释掉 <module>flume-ng-morphline-solr-sink</module>，最后可以愉快的看到 [INFO] BUILD SUCCESS 啦