Bad_NodeIdUnknown

[ghost]

Hello.
I'm trying to create a java opcua server based on your library. Since there is not much documentation I use the example from your previous project and try to add a SqrtMethod() to HelloWorld of Milo, so here is a modified addNodes() method of the HelloWorldNamespace.java

    private void addNodes(UaFolderNode folderNode) {
        for (Object[] os : STATIC_SCALAR_NODES) {
            String name = (String) os[0];
            NodeId typeId = (NodeId) os[1];
            Variant variant = (Variant) os[2];

        UaMethodNode methodNode = UaMethodNode.builder(server.getNodeManager())
        .setNodeId(new NodeId(namespaceIndex, "/Methods/sqrt(x)"))
        .setBrowseName(new QualifiedName(namespaceIndex, "sqrt(x)"))
        .setDisplayName(new LocalizedText(null, "sqrt(x)"))
        .setDescription(LocalizedText.english("Returns the correctly rounded positive square root of a double value."))
        .build();

        try {
            AnnotationBasedInvocationHandler invocationHandler=AnnotationBasedInvocationHandler.fromAnnotatedObject(server.getNodeManager(),new SqrtMethod());
            methodNode.setProperty(UaMethodNode.InputArguments,invocationHandler.getInputArguments());
            methodNode.setProperty(UaMethodNode.OutputArguments,invocationHandler.getOutputArguments());
            methodNode.setInvocationHandler(invocationHandler);            
            UaVariableNode node = new UaVariableNode.UaVariableNodeBuilder(server.getNodeManager())
                .setNodeId(new NodeId(namespaceIndex, "Methods/" + name))
                .setAccessLevel(ubyte(AccessLevel.getMask(AccessLevel.READ_WRITE)))
                .setBrowseName(new QualifiedName(namespaceIndex, name))
                .setDisplayName(LocalizedText.english(name))
                .setDataType(typeId)
                .setTypeDefinition(Identifiers.BaseDataVariableType)
                .build();

            node.setValue(new DataValue(variant));

            server.getNodeManager().addNode(node);
            server.getNodeManager().addNode(methodNode);
            folderNode.addOrganizes(node);
            folderNode.addOrganizes(methodNode);

            folderNode.addReference(new Reference(folderNode.getNodeId(),Identifiers.HasComponent,methodNode.getNodeId().expanded(),methodNode.getNodeClass(),true));
            } catch (Exception e) {
                logger.error("Error creating sqrt() method.",e);
            }
        }
    }

The class for SqrtMethod is:

public class SqrtMethod {

    private final Logger logger = LoggerFactory.getLogger(getClass());

    @UaMethod
    public void invoke(
            InvocationContext context,

            @UaInputArgument(
                    name = "x",
                    description = "A value.")
            Double x,

            @UaOutputArgument(
                    name = "x_sqrt",
                    description = "The positive square root of x. If the argument is NaN or less than zero, the result is NaN.")
            Out<Double> xSqrt) {

        System.out.println("sqrt(" + x.toString() + ")");
        logger.debug(String.format("Invoking sqrt() method of Object '%s'", context.getObjectNode().getBrowseName().getName()));

        xSqrt.set(Math.sqrt(x));
    }

}

To connect to the server I use Prosys OPC UA Java Client and when I try to call the appropriate method with this client I get:
Failed to call:Bad_NodeIdUnknown (0x80340000) "The node id refers to a node that does not exist in the server address space."

Since variables work correctly and I never had any issues with Prosys I assume something is wrong with your software. Can you please help to solve it? Thanks.

[kevinherron]

ExampleNamespace on the more-examples branch has an example implementation of the sqrt method now: https://github.com/eclipse/milo/blob/more-examples/milo-examples/client-examples/src/main/java/org/eclipse/milo/examples/client/server/ExampleNamespace.java

The part you may have missed is overriding getInvocationHandler, which you can see at the bottom of the example namespace.

There is also a fully runnable example here: https://github.com/eclipse/milo/blob/more-examples/milo-examples/client-examples/src/main/java/org/eclipse/milo/examples/client/MethodExample.java

[ghost]

Thanks. Was not obvious for me and I missed more examples you've provided.

[kevinherron]

The more-examples branch is in progress. Once I finish up a few more things I'll merge it back into master and it won't be so hidden away.