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Prerequisites

1. Download Oracle jdk-6u45-linux-i586.bin from Oracle website. Openjdk is unsuitable here because some package like sun.net.dns.ResolverConfiguration only exists in rt.jar of Oracle jdk;

2. Install (./jdk.bin) this jdk at ~/apps/jdk with current user (do not install it into /opt with root user, because this will cause access restriction of rt.jar of jdk);

3. Add $JAVA_HOME and $CLASSPATH into /etc/profile and re-log into OS to validate;

4. Add this jdk to eclipse (Preferences -> Install JREs);

Method 8-10

Follow Working with Hadoop under Eclipse

1. make sure your maven version is 3.x (mvn --version), if not:

sudo apt-get remove maven2 sudo apt-get update sudo apt-get install maven

1. git clone git://git.apache.org/hadoop-common.git ()

2. mvn install -DskipTests

3. mvn eclipse:eclipse -DdownloadSources=true -DdownloadJavadocs=true

Method 8-9

1. Create a Java Project in Eclipse, modify default output folder to $PROJECT_HOME/out (because "bin" is a script folder in hadoop source pack);

2. Exclude src from source folder and create "lib", "conf" folder under $PROJECT_HOME;

3. Import $HADOOP_HOME/src, lib, conf into $PROJECT_HOME;

4. Add all jar files under lib to build path;

5. Add ant.jar to build path;

6. Add mapred, tools, ant, core, hdfs under src folder as source folder;

Verify

1. modify config files;

2. run hadoop

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