[ivy:resolve] :: commons-logging#commons-logging;1.1.1: several problems occurred while resolving dependency: commons-logging#commons-logging;1.1.1 {common=[default]}:
[ivy:resolve] reactor-repo: unable to get resource for commons-logging#commons-logging;1.1.1: res=${reactor.repo}/commons-logging/commons-logging/1.1.1/commons-logging-1.1.1.pom: java.net.MalformedURLException: no protocol: ${reactor.repo}/commons-logging/commons-logging/1.1.1/commons-logging-1.1.1.pom
[ivy:resolve] several problems occurred while resolving dependency: org.apache.commons#commons-parent;5 {}:
[ivy:resolve] reactor-repo: unable to get resource for org/apache/commons#commons-parent;5: res=${reactor.repo}/org/apache/commons/commons-parent/5/commons-parent-5.pom: java.net.MalformedURLException: no protocol: ${reactor.repo}/org/apache/commons/commons-parent/5/commons-parent-5.pom
[ivy:resolve] several problems occurred while resolving dependency: org.apache#apache;4 {}:
[ivy:resolve] reactor-repo: unable to get resource for org/apache#apache;4: res=${reactor.repo}/org/apache/apache/4/apache-4.pom: java.net.MalformedURLException: no protocol: ${reactor.repo}/org/apache/apache/4/apache-4.pom
[ivy:resolve] reactor-repo: unable to get resource for org/apache#apache;4: res=${reactor.repo}/org/apache/apache/4/apache-4.jar: java.net.MalformedURLException: no protocol: ${reactor.repo}/org/apache/apache/4/apache-4.jar
[ivy:resolve] :: log4j#log4j;1.2.16: several problems occurred while resolving dependency: log4j#log4j;1.2.16 {common=[master]}:
[ivy:resolve] reactor-repo: unable to get resource for log4j#log4j;1.2.16: res=${reactor.repo}/log4j/log4j/1.2.16/log4j-1.2.16.pom: java.net.MalformedURLException: no protocol: ${reactor.repo}/log4j/log4j/1.2.16/log4j-1.2.16.pom
[ivy:resolve] reactor-repo: unable to get resource for log4j#log4j;1.2.16: res=${reactor.repo}/log4j/log4j/1.2.16/log4j-1.2.16.jar: java.net.MalformedURLException: no protocol: ${reactor.repo}/log4j/log4j/1.2.16/log4j-1.2.16.jar
[ivy:resolve] ::::::::::::::::::::::::::::::::::::::::::::::
[ivy:resolve]
[ivy:resolve] :: USE VERBOSE OR DEBUG MESSAGE LEVEL FOR MORE DETAILS
解决方式：
找到hadoop_source_pack/src/hadoop-mapreduce1-project/src/contrib/eclipse-plugin/build.properties
增加如下：
eclipse.home=/home/cloudera/eclipse
reactor.repo=https://repository.cloudera.com/content/repositories/snapshots
version=2.0.0-cdh4.4.0
参考
http://stackoverflow.com/questions/18852338/ant-build-for-eclipse-cant-resolve-log4j