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Troubleshooting.md

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Here is a list of common issues encountered during the bootcamp, and how to fix them.

  • java.io.NotSerializableException: net.corda.core.contracts.TransactionState -> data(net.corda.core.contracts.ContractState) -> Constructor parameter - "arg0" - doesn't refer to a property of "class java_bootcamp.TokenState" -> class java_bootcamp.TokenState

    • Cause: The Corda serialisation framework requires the Java compiler to preserve the argument names when generating bytecode, so that objects can be correctly recreated later

    • Fix: In IntelliJ:

      • Open the settings:
        • Windows: File -> Settings
        • osX: IntelliJ IDEA -> Preferences...
      • Go to Build, Execution, Deployment -> Compiler -> Java Compiler
      • Write -parameters in the Additional command line parameters field
      • Completely rebuild the project (Build -> Rebuild Project)

  • java.lang.IllegalStateException: Missing the '-javaagent' JVM argument. when running flow tests

    • Cause: The Quasar library must be used to instrument the flows so that the flows can be checkpointed correctly

    • Fix: Open the run configuration used to run the test and add the -javaagent:lib/quasar.jar flag to VM options: (see here)

  • Invalid Gradle JDK configuration found... Project JDK is not specified. when importing the project using Gradle

    • Cause: You need to tell IntelliJ which JDK to use for your project

    • Fix: Click File > Project Structure… and select the Project SDK. Add a new SDK if required by clicking New… and selecting the folder containing the JDK. You'll need to close and re-open the project before attempting to import the Gradle project again

  • net.corda.core.transactions.MissingContractAttachments: Cannot find contract attachments for [java_bootcamp.TokenContract]. when running contract tests

    • Cause: Your TokenContract does not implement the Contract interface

    • Fix: Implement the Contract interface on TokenContract

  • Error: java: invalid source release 1.9

    • Cause: Your project is compiling against the wrong version of Java

    • Fix: Go to Project Structure > Modules and change Language level: to 8

  • Could not determine java version from 'X.Y.Z'. when building the nodes from the command line

    • Cause: Your terminal is using the wrong version of Java

    • Fix: Repoint your terminal to use Java 8 (e.g. "export JAVA_HOME=/usr/libexec/java_home -v 1.8" on macOS)