* Support Java 11

* config travis to use oracle jdk 11

* Add check jdk version

Change insert gc_options

Update list

Fix gc-logging

* Support Java 11

* config travis to use oracle jdk 11

* Add check jdk version

Change insert gc_options

Update list

Fix gc-logging

…etheus-metrics' of https://github.com/thinker0/heron into feature/fix-prometheus-metrics

* 'feature/fix-prometheus-metrics' of https://github.com/thinker0/heron:
  Remove unused
  Fix checkstyle
  Support jmx_exporter format configuration.
  wip
  Fix command arguments.
  Java 11 support (apache#3399)
  Update README for Java 11 (apache#3464)
  Update website for java 11 (apache#3462)
  Java 11 support (apache#3454)
  adding examples folder to classpath (apache#3458)
  removing symlink.  Adding contributing guidelines back (apache#3450)
  adding new committers (apache#3451)
  Bump mixin-deep from 1.3.1 to 1.3.2 in /website2/website (apache#3391)
  Add redirect from github pages to new apache site (apache#3448)
  remove old site (apache#3446)
  Use netcat-bsd in Debian (apache#3447)
  Added execute permission to dev-env-create.sh (apache#3443)

* 'feature/fix-prometheus-metrics' of https://github.com/thinker0/heron:
  Remove unused
  Fix checkstyle
  Support jmx_exporter format configuration.
  wip
  Fix command arguments.
  Java 11 support (apache#3399)
  Update README for Java 11 (apache#3464)
  Update website for java 11 (apache#3462)
  Java 11 support (apache#3454)
  adding examples folder to classpath (apache#3458)
  removing symlink.  Adding contributing guidelines back (apache#3450)
  adding new committers (apache#3451)
  Bump mixin-deep from 1.3.1 to 1.3.2 in /website2/website (apache#3391)
  Add redirect from github pages to new apache site (apache#3448)
  remove old site (apache#3446)
  Use netcat-bsd in Debian (apache#3447)
  Added execute permission to dev-env-create.sh (apache#3443)

# Conflicts:
#	.travis.yml

* master:
  Improve concurrency for needed parts. (apache#3107)
  Add documents for setting up a docker based development environment (apache#3475)
  Patch to fix cppcheck with newer glibc (apache#3471)
  Make log/sink/consume Streamlet component support setName and setNumPartitions (apache#3459)

…artitions (apache#3459)

…pache#3475)

* Change concurrent Map

* Change concurrent Map

* HashMap changes for unneeded parts.

* HashMap changes for unneeded parts.

* Review changes

* Changes HashMap for unneeded parts.

* Improve concurrency for needed parts.

* Remove unused imports.

* Remove unused imports.

* Remove unused imports.

* Fix NPE

(cherry picked from commit 545d381)

* Fix WhitespaceAround

* Add dummy Object

* Fix ConstantName

(cherry picked from commit 8d6d506)

…hinker0/heron into feature/support-custom-metrics-rules-for-prometheus-sink

* 'feature/fix-prometheus-metrics' of https://github.com/thinker0/heron:
  Add Rules
  Update kafkaOffset metrics
  Improve concurrency for needed parts. (apache#3107)
  Add documents for setting up a docker based development environment (apache#3475)
  Patch to fix cppcheck with newer glibc (apache#3471)
  Make log/sink/consume Streamlet component support setName and setNumPartitions (apache#3459)