[hotfix] [build] Force delete corrupt jar files from cache

.travis.yml

@@ -112,7 +112,7 @@ before_install:
  - "export PATH=$M2_HOME/bin:$PATH"
  - "export MAVEN_OPTS=\"-Dorg.slf4j.simpleLogger.showDateTime=true -Dorg.slf4j.simpleLogger.dateTimeFormat=HH:mm:ss.SSS\""
 # just in case: clean up the .m2 home and remove invalid jar files
- - 'test ! -d $HOME/.m2/repository/ || find $HOME/.m2/repository/ -name "*.jar" -exec sh -c ''if ! zip -T {} >/dev/null ; then echo "deleting invalid file: {}"; rm {} ; fi'' \;'
+ - 'test ! -d $HOME/.m2/repository/ || find $HOME/.m2/repository/ -name "*.jar" -exec sh -c ''if ! zip -T {} >/dev/null ; then echo "deleting invalid file: {}"; rm -f {} ; fi'' \;'
 
 # We run mvn and monitor its output. If there is no output for the specified number of seconds, we
 # print the stack traces of all running Java processes.