DemoBench is a standalone desktop application that makes it easy to configure and launch local Corda nodes. It is useful for training sessions, demos or just experimentation.
Installers compatible with the latest Corda release can be downloaded from the Corda website.
- Configuring a Node
Each node must have a unique name to identify it to the network map service. DemoBench will suggest node names, nearest cities and local port numbers to use.
The first node will host the network map service, and we are forcing that node also to be a notary. Hence only notary services will be available to be selected in the
Serviceslist. For subsequent nodes you may also select any of Corda’s other built-in services.
Start nodebutton to launch the Corda node with your configuration.
- Running Nodes
- DemoBench launches each new node in a terminal emulator. The
Launch Web Serverbuttons will all be disabled until the node has finished booting. DemoBench will then display simple statistics about the node such as its cash balance.
It is currently impossible from DemoBench to restart a node that has terminated, e.g. because the user typed “bye” at the node’s shell prompt. However, that node’s data and logs still remain in its directory.
- Exiting DemoBench
- When you terminate DemoBench, it will automatically shut down any nodes and explorers that it has launched and then exit.
- You can save the configurations and CorDapps for all of DemoBench’s currently running nodes into a profile, which is a
ZIPfile with the following layout, e.g.:
notary/ node.conf plugins/ banka/ node.conf plugins/ bankb/ node.conf plugins/ example-cordapp.jar ...
When DemoBench reloads this profile it will close any nodes that it is currently running and then launch these new nodes instead. All nodes will be created with a brand new database. Note that the
node.conffiles within each profile are JSON/HOCON format, and so can be extracted and edited as required.
DemoBench writes a log file to the following location:
Building the Installers¶
Gradle defines tasks that build DemoBench installers using JavaPackager. There are three scripts in the
tools/demobench directory to execute these tasks:
Each script can only be run on its target platform, and each expects the platform’s installation tools already to be available.
- Windows: Inno Setup 5+
- MacOS: The packaging tools should be available automatically. The DMG contents will also be signed if the packager finds a valid
Developer ID Applicationcertificate with a private key on the keyring. (By default, DemoBench’s
build.gradleexpects the signing key’s user name to be “R3CEV”.) You can create such a certificate by generating a Certificate Signing Request and then asking your local “Apple team agent” to upload it to the Apple Developer portal. (See here.)
- Please ensure that the
/usr/bin/codesignapplication always has access to your certificate’s signing key. You may need to reboot your Mac after making any changes via the MacOS Keychain Access application.
- You should use JDK >= 8u152 to build DemoBench on MacOS because this version resolves a warning message that is printed to the terminal when starting each Corda node.
- Ideally, use the JetBrains JDK to build the DMG.
You will also need to define the environment variable
JAVA_HOME to point to the same JDK that you use to run Gradle. The installer will be written to the
tools/demobench/build/javapackage/bundles directory, and can be installed like any other application for your platform.
Mac users should note that the best way to build a DemoBench DMG is with the JetBrains JDK which has binary downloads available from BinTray. This JDK has some useful GUI fixes, most notably, when built with this JDK the DemoBench terminal will support emoji and as such, the nicer coloured ANSI progress renderer. It also resolves some issues with HiDPI rendering on Windows.
This JDK does not include JavaPackager, which means that you will still need to copy
$JAVA_HOME/lib/ant-javafx.jar from an Oracle JDK into the corresponding directory within your JetBrains JDK.
Developers wishing to run DemoBench without building a new installer each time can install it locally using Gradle:
$ gradlew tools:demobench:installDist $ cd tools/demobench/build/install/demobench $ bin/demobench
$CLASSPATH may be too long for the Windows shell . In which case you can still run DemoBench as follows:
> java -Djava.util.logging.config.class=net.corda.demobench.config.LoggingConfig -jar lib/demobench-$version.jar
While DemoBench can be executed within an IDE, it would be up to the Developer to install all of its runtime
dependencies beforehand into their correct locations relative to the value of the
user.dir system property (i.e. the
current working directory of the JVM):
corda/ corda.jar corda-webserver.jar explorer/ node-explorer.jar plugins/ bank-of-corda.jar