Hi, I would like to add more instructions on how to compile *FileConcatenatorPGE project* on page *https://cwiki.apache.org/confluence/display/OODT/CAS-PGE+Learn+by+Example <https://cwiki.apache.org/confluence/display/OODT/CAS-PGE+Learn+by+Example>*
In the current instruction, step 4,*Build and deploy FileConcatenatorPGE* seems really simple, *cd /usr/local/src/fileconcatenator-pge* *mvn package* *mv target/fileconcatenator-pge-*.jar $WORKFLOW_HOME/lib* however, in practice, the maven fails to build the project. Why? This is because in pom.xml file, it specifies oodt to be 0.3-SNAPSHOT. For those who are using oodt 0.7, there are two ways to fix the problem. One way is really simple, change the oodt version to 0.3 in pom.xml, and *mvn install* again. This will work perfectly compatible with oodt 0.7. The other solution is to change oodt version to 0.7 and follow the steps below: 1. Add a *PgeTaskMetadataKeys.java* file in the fileconcatenator home: *$FILECONCATENATOR_HOME/src/main/java/org/apache/oodt/pge/examples/fileconcatenator.* The *PgeTaskMetadataKey.java *is one of the import source for *FileConcatenatorPGETask.java* file in the same folder. Without the import source, compiler would fail to compile the *FileConcatenatorPGETask.java*. 2. Open the *FileConcatenatorPGETask.java*, add a "*thows Exception*" for the overriden function *updataStatus(String status).* 3. Save the above changes and use *mvn package* or *mvn install* to compile again, this time the build will be successful. Cheers! By the way, the *PgeTaskMetadataKeys.java* can be found at: *http://grepcode.com/file/repo1.maven.org/maven2/org.apache.oodt/cas-pge/0.3/org/apache/oodt/cas/pge/metadata/PgeTaskMetadataKeys.java <http://grepcode.com/file/repo1.maven.org/maven2/org.apache.oodt/cas-pge/0.3/org/apache/oodt/cas/pge/metadata/PgeTaskMetadataKeys.java>*
