You may have encountered outofMemory issues when building source with Maven2. This normally happens when Maven runs out of available system memory.
In such case you have to set MAVEN_OPTS environment variable to increase the available memory.
Open a command prompt in which you build the source and enter the following options. (Change the memory size according to the amount of memory in your system)
Open a shell and set the options as follows.
export MAVEN_OPTS="-Xmx1024m -XX:MaxPermSize=128m"