Specs for JVM example (#825)

examples/jvm/java/specs/README

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+
+Fission Specs
+=============
+
+This is a set of specifications for a Fission app.  This includes functions,
+environments, and triggers; we collectively call these things "resources".
+
+How to use these specs
+----------------------
+
+These specs are handled with the 'fission spec' command.  See 'fission spec --help'.
+
+'fission spec apply' will "apply" all resources specified in this directory to your
+cluster.  That means it checks what resources exist on your cluster, what resources are
+specified in the specs directory, and reconciles the difference by creating, updating or
+deleting resources on the cluster.
+
+'fission spec apply' will also package up your source code (or compiled binaries) and
+upload the archives to the cluster if needed.  It uses 'ArchiveUploadSpec' resources in
+this directory to figure out which files to archive.
+
+You can use 'fission spec apply --watch' to watch for file changes and continuously keep
+the cluster updated.
+
+You can add YAMLs to this directory by writing them manually, but it's easier to generate
+them.  Use 'fission function create --spec' to generate a function spec,
+'fission environment create --spec' to generate an environment spec, and so on.
+
+You can edit any of the files in this directory, except 'fission-deployment-config.yaml',
+which contains a UID that you should never change.  To apply your changes simply use
+'fission spec apply'.
+
+fission-deployment-config.yaml
+------------------------------
+
+fission-deployment-config.yaml contains a UID.  This UID is what fission uses to correlate
+resources on the cluster to resources in this directory.
+
+All resources created by 'fission spec apply' are annotated with this UID.  Resources on
+the cluster that are _not_ annotated with this UID are never modified or deleted by
+fission.
+

examples/jvm/java/specs/fission-deployment-config.yaml

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+# This file is generated by the 'fission spec init' command.
+# See the README in this directory for background and usage information.
+# Do not edit the UID below: that will break 'fission spec apply'
+apiVersion: fission.io/v1
+kind: DeploymentConfig
+name: java
+uid: 3305cef5-21e6-4a55-b977-5c76ee62b0a6

examples/jvm/java/specs/function-hello-java.yaml

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+include:
+- src/
+- pom.xml
+kind: ArchiveUploadSpec
+name: helloworld-java
+
+---
+apiVersion: fission.io/v1
+kind: Package
+metadata:
+  creationTimestamp: null
+  name: helloworld-java-127w
+  namespace: default
+spec:
+  deployment:
+    checksum: {}
+  environment:
+    name: java
+    namespace: default
+  source:
+    checksum: {}
+    type: url
+    url: archive://helloworld-java
+status:
+  buildstatus: pending
+
+---
+apiVersion: fission.io/v1
+kind: Function
+metadata:
+  creationTimestamp: null
+  name: hello-java
+  namespace: default
+spec:
+  InvokeStrategy:
+    ExecutionStrategy:
+      ExecutorType: poolmgr
+      MaxScale: 1
+      MinScale: 0
+      TargetCPUPercent: 80
+    StrategyType: execution
+  configmaps: null
+  environment:
+    name: java
+    namespace: default
+  package:
+    functionName: io.fission.HelloWorld
+    packageref:
+      name: helloworld-java-127w
+      namespace: default
+  resources: {}
+  secrets: null