flowable/flowable-engine · error · FlowableIllegalArgumentException

The channel definition id is mandatory, but '' has been prov

Error message

The channel definition id is mandatory, but '' has been provided.

What it means

The GetChannelDefinitionResourceCmd constructor requires a non-empty channelDefinitionId; a null or empty string throws FlowableIllegalArgumentException. The command fetches the deployed resource stream for a channel definition, which is meaningless without an id.

Source

Thrown at modules/flowable-event-registry/src/main/java/org/flowable/eventregistry/impl/cmd/GetChannelDefinitionResourceCmd.java:37

import org.flowable.common.engine.api.FlowableIllegalArgumentException;
import org.flowable.common.engine.impl.interceptor.Command;
import org.flowable.common.engine.impl.interceptor.CommandContext;
import org.flowable.eventregistry.impl.persistence.entity.ChannelDefinitionEntity;
import org.flowable.eventregistry.impl.util.CommandContextUtil;

/**
 * Gives access to a deployed event model, e.g., an Event definition JSON file, through a stream of bytes.
 * 
 * @author Tijs Rademakers
 */
public class GetChannelDefinitionResourceCmd implements Command<InputStream>, Serializable {

    private static final long serialVersionUID = 1L;
    protected String channelDefinitionId;

    public GetChannelDefinitionResourceCmd(String channelDefinitionId) {
        if (channelDefinitionId == null || channelDefinitionId.length() < 1) {
            throw new FlowableIllegalArgumentException("The channel definition id is mandatory, but '" + channelDefinitionId + "' has been provided.");
        }
        this.channelDefinitionId = channelDefinitionId;
    }

    @Override
    public InputStream execute(CommandContext commandContext) {
        ChannelDefinitionEntity channelDefinition = CommandContextUtil.getEventRegistryConfiguration().getDeploymentManager()
                .findDeployedChannelDefinitionById(channelDefinitionId);

        String deploymentId = channelDefinition.getDeploymentId();
        String resourceName = channelDefinition.getResourceName();
        InputStream channelDefinitionStream = new GetDeploymentResourceCmd(deploymentId, resourceName).execute(commandContext);
        return channelDefinitionStream;
    }

}

View on GitHub (pinned to d6d39ce1c6)

Solutions

1. Pass the actual channel definition id obtained from a query or deployment result
2. Validate the id is non-null and non-empty at the caller before invoking the command

Example fix

// before
String id = request.getParameter("channelId"); // may be null/empty
InputStream is = repositoryService.getChannelDefinitionResource(id);
// after
String id = request.getParameter("channelId");
if (id == null || id.isEmpty()) throw new IllegalArgumentException("channelId required");
InputStream is = repositoryService.getChannelDefinitionResource(id);

boolean validId(String id) { return id != null && !id.trim().isEmpty(); }

try {
    InputStream is = repositoryService.getChannelDefinitionResource(channelDefinitionId);
} catch (FlowableIllegalArgumentException e) {
    LOGGER.error("invalid channel definition id supplied");
}

When it happens

Trigger: Constructing new GetChannelDefinitionResourceCmd(null) or new GetChannelDefinitionResourceCmd("") directly, or calling repositoryService.getChannelDefinitionResource("") / with a null id.

Common situations: Id field never populated from a request path variable; trimming stripped an id down to empty; a default empty-string initialization leaked into the command.

Understand the failure class

Background: "missing required argument" and "the following required arguments were not provided": what required-argument errors mean and how to fix them — this error's family across 20 libraries.

Related errors

• The case definition id is mandatory, but '' has been provide
• The task definition key is mandatory, but '${taskDefinitionK
• The process instance id is mandatory, but '<processInstanceI
• variableName is null
• caseInstanceId is null

AI-assisted analysis of flowable/flowable-engine@d6d39ce1c6 (2026-09-11). Data as JSON: /api/errors/883cacee5e0c4b79. Report an issue: GitHub.