Prior to this change it was intermittently failing with:
```
net.corda.client.rpc.RPCException: RPC server is not available.
at net.corda.client.rpc.internal.RPCClientProxyHandler.invoke(RPCClientProxyHandler.kt:222)
at com.sun.proxy.$Proxy79.ping(Unknown Source)
at net.corda.client.rpc.RPCStabilityTests$client reconnects to rebooted server$1$pingFuture$1.invoke(RPCStabilityTests.kt:251)
at net.corda.client.rpc.RPCStabilityTests$client reconnects to rebooted server$1$pingFuture$1.invoke(RPCStabilityTests.kt:36)
at net.corda.core.internal.concurrent.ValueOrException$DefaultImpls.capture(CordaFutureImpl.kt:107)
at net.corda.core.internal.concurrent.OpenFuture$DefaultImpls.capture(CordaFutureImpl.kt:65535)
at net.corda.core.internal.concurrent.CordaFutureImpl.capture(CordaFutureImpl.kt:119)
at net.corda.core.internal.concurrent.CordaFutureImplKt$fork$$inlined$also$lambda$1.run(CordaFutureImpl.kt:22)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:748)
```
* Improve error reporting in case of failure of flaky tests
Also eliminate warnings and other minor changes.
* Address code review comments raised by @exFalso
Also improve output for stack traces.
* rework message handling while connection is down: do not send anything, throw on all obs and futures when failure detected
* RPC calls will throw if used during failover; adapted tests
* CORDA-296: added handler for connection failover
print rpc address during node startup
* address PR comments: typo, whitespace, onError observables
* reworked rpc client msg buffering to avoid race conditions when failure happens while the request is being prepared to be sent; added unit test for 8 threads sharing same client sending 1000 requests
* decreased sleep time in rpc test, code cleanup
- Existing embedded Shell connects via RPC including checking RPC user credentials (before was a direct use of CordaRPCOps): in dev mode when console terminal is enabled, node created `shell` user.
- New Standalone Shell app with the same functionalities as Shell: connects to a node via RPC Client, can use SSL and run SSH server.
* CORDA-986 and CORDA-985 CompositeKey and Signature verification performance fixes (#2467)
* CORDA-696: Create separate transaction types for contract upgrade transactions.
Add rationale around upgrade transactions
Move contract upgrade transaction resolution logic into internal until it's stabilised.
Throw a better exception when contract attachment not found
Default legacy contract constraint to always accepting - needs to be changed to whitelist constraint before merging
Introduce a new upgraded contract interface that allows specifying the legacy constraint.
Remove StateLoader, make all tx resolution functions take in ServicesForResolution
Contract upgrade transactions can handle whitelist by zone constraints
When creating a contract upgrade transaction, make sure the attachment of the old cordapp gets attached when using hash constraints.
Attachment lookup for a given contract class name only scans currently loaded cordapps, and we don't load old versions of cordapps.
CORDA-696: Update upgrade docs
Also for "client/rpc" explicitly specify "jvmTarget" (similar to what "experimental/behave" does) to avoid ambiguity.
Without this change the following compilation error been observed in IntelliJ:
Z:\corda\experimental\behave\src\main\kotlin\net\corda\behave\node\Node.kt
Error:(163, 44) Kotlin: Cannot inline bytecode built with JVM target 1.8 into bytecode that is being built with JVM target 1.6. Please specify proper '-jvm-target' option
* Remove sslConfiguration from public constructor of CordaRPCClient
* Address review comments
* Update api-current.txt
* sslConfiguration doesn't need to be a property
* Don't expose StartedNode via Node Driver
* Dont expose StartedNode/Abstract Node via MockNetwork
* Remove internal var from constructor as it doesn't hide from public api and change to internal initialisation method
* Update api
* Rename MockNode to StartedMockNode to avoid confusion
Update documentation
Update api-current.txt
* Fix typo
* Fix test failure
* Modify flow tests to use internal mock network and remove additional internal exposures from StartedMockNode
* Fix api-current
* Change InProcess and OutOfProcess to interfaces
* Explicitly declare MockNetwork parameters
Dont expose StateMachineManager
Move affected tests to use internal mock network
* Fix api-current
* Changes requested via review
* Fix IRS Demo address
* Fix api
* Remove internal attribute from classes in internal package
* Remove accidentally added code
* Move useHttps into NodeHandleInternal
* Remove duplicated code
* Update api-current
* Make webAddress internal on NodeHandle
* Make sure parameters in public api are explicitly specified
* Use correct address in IRS Demo
* Get webaddress from webserver handle
* Update api-current
Minor tweaks to the invocation context code.
1) Un-deprecate FlowInitiator, move the deprecation to the field. This
eliminates large numbers of warnings and means developers are warned
only once in the place where they obtain one.
2) Add documentation for StateMachineInfo and create a type alias to give
it a better name in an ABI compatible way.
3) Improve markup on InvocationContext
4) Rename field from just "context" to "invocationContext" (Context is vague)
* Align CordaRPCJavaClientTest with Kotlin version of the test ((byte)0 instead of "1".getBytes())
* Refactoring to align with enterprise repo (exceptions).
* Able to send hand coded messages to an Artemis node inbox
Get startup race condition fixed. Start cleanup work.
Fixup after rebase
Remove SASL hack for now
Minor tweaks. Enable AMQP mode manually.
Add configuration control
Slight clean up
Stop timeouts that don't work with AMQP
Rename class
Get TLS constants from :node-api
Primitive integration test
Put back commented line
Session per bridge to alow rollback on remote rejects.
Add more tests and handle multiple IP adddresses
Reduce logging
Fixup after rebase
Add a test to verify the remote end AMQP rejection logic works and does cause message replay.
Allow Artemis to duplicate after session rollback
Reduce number of threads
Move legacy bridge related code over to CoreBridgeManager
Shared threadpool for bridges
Add a test to confirm that no side effects when using a shared thread pool.
Address PR comments and remove dead lines
Rebase and add some comments
Remove a couple of blank lines
Ensure AMQP bridges are used in tests
Fixup after removal of testNodeConfiguration
Add a couple of doc comments
Add a couple of doc comments
Make things internal and use CordaFuture
Address some PR comments
Change comment type
* Use Artemis 2.2 to fix AMQP problems. Add explicit test of legacy core bridges, as marking the factory class private had silently broken them.
* Fix change due to using Artemis 2.2
* Extend unit test on RPCSecurityManager
* Fix corner cases in permission parsing and bug in tryAuthenticate
* Rework docsite page
* Add missing ChangeLog entry
* Add support for external data source of access control data (RPC/Shell users credential and permissions), with optional in-memory caching.
* Support password encoded with Apache Shiro fully reversible Modular Crypt Format.
* Introduce 'security' field in Node configuration and related docsite page.
