flowable/flowable-engine · error · FlowableException

channel definition bytes is null

Error message

channel definition bytes is null

What it means

FlowableException thrown by EventDeploymentBuilderImpl.addChannelDefinitionBytes when the byte[] argument is null. Channel definition bytes are stored as a deployment resource; null payloads are rejected before entity creation.

Solutions

1. Verify the byte[] is non-null (and non-empty) before calling addChannelDefinitionBytes.
2. Check the upstream loader/fetch that produced the bytes and fail fast there.
3. Use addChannelDefinition(String) for classpath resources instead of manually loaded bytes.

Example fix

// before
byte[] bytes = fetchChannelDef("inbound-orders"); // may return null
builder.addChannelDefinitionBytes("inbound-orders.channel", bytes);
// after
byte[] bytes = fetchChannelDef("inbound-orders");
Objects.requireNonNull(bytes, "channel definition bytes missing for inbound-orders");
builder.addChannelDefinitionBytes("inbound-orders.channel", bytes);

if (bytes == null || bytes.length == 0) { throw new IllegalArgumentException("channel definition bytes must be non-empty"); }

boolean ok = bytes != null && bytes.length > 0;

try { builder.addChannelDefinitionBytes(name, bytes); } catch (FlowableException e) { LOG.error("null channel definition bytes"); throw e; }

When it happens

Trigger: Calling deploymentBuilder.addChannelDefinitionBytes(resourceName, null); typically bytes from an unsuccessful file/HTTP load.

Common situations: Channel definition JSON fetched from a service that returned null body; build-time generated bytes not produced due to a failed codegen step.

Related errors

• bytes is null
• event definition bytes is null
• text is null
• text is null
• Business key is null

AI-assisted analysis of flowable/flowable-engine@d6d39ce1c6 (2026-09-11). Data as JSON: /api/errors/2d70275c0906ac21. Report an issue: GitHub.

Appendix: source

Thrown at modules/flowable-event-registry/src/main/java/org/flowable/eventregistry/impl/repository/EventDeploymentBuilderImpl.java:123

        }

        EventResourceEntity resource = resourceEntityManager.create();
        resource.setName(resourceName);
        resource.setBytes(eventDefinitionBytes);
        deployment.addResource(resource);
        return this;
    }

    @Override
    public EventDeploymentBuilder addEventDefinition(String resourceName, String eventDefinition) {
        addString(resourceName, eventDefinition);
        return this;
    }
    
    @Override
    public EventDeploymentBuilder addChannelDefinitionBytes(String resourceName, byte[] channelDefinitionBytes) {
        if (channelDefinitionBytes == null) {
            throw new FlowableException("channel definition bytes is null");
        }

        EventResourceEntity resource = resourceEntityManager.create();
        resource.setName(resourceName);
        resource.setBytes(channelDefinitionBytes);
        deployment.addResource(resource);
        return this;
    }

    @Override
    public EventDeploymentBuilder addChannelDefinition(String resourceName, String channelDefinition) {
        addString(resourceName, channelDefinition);
        return this;
    }

    @Override
    public EventDeploymentBuilder name(String name) {
        deployment.setName(name);

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