Resulting files are not executable

[cjdelisle]

Data Collectors are executed by invoking java externally to the XWiki instance but none of the jar files which result from the build are executable.

user@blk1:~/riscoss-data-collector$ find ./ -name '*.jar' -exec java -jar {} \;
no main manifest attribute, in ./riscoss-rdc-travis_ci/target/riscoss-rdc-travis_ci-0.0.1-SNAPSHOT.jar
no main manifest attribute, in ./riscoss-rdc-jira/target/riscoss-rdc-jira-0.0.1-SNAPSHOT.jar
no main manifest attribute, in ./riscoss-rdc-github/target/riscoss-rdc-github-0.0.1-SNAPSHOT.jar
no main manifest attribute, in ./riscoss-rdr/target/riscoss-rdr-0.0.1-SNAPSHOT.jar
no main manifest attribute, in ./riscoss-rdc-api/target/riscoss-rdc-api-0.0.1-SNAPSHOT.jar
no main manifest attribute, in ./riscoss-rdc-sonar/target/riscoss-rdc-sonar-0.0.1-SNAPSHOT.jar
no main manifest attribute, in ./riscoss-rdc-fossology/target/riscoss-rdc-fossology-0.0.1-SNAPSHOT.jar
no main manifest attribute, in ./riscoss-rdc-maven/target/riscoss-rdc-maven-0.0.1-SNAPSHOT.jar
no main manifest attribute, in ./riscoss-rdc-markmail/target/riscoss-rdc-markmail-0.0.1-SNAPSHOT.jar
user@blk1:~/riscoss-data-collector$