hyperledger/fabric · error

ChaincodeSpec's path cannot be empty

Error message

ChaincodeSpec's path cannot be empty

What it means

A guard in the Java platform's GetDeploymentPayload: it rejects the packaging request when the ChaincodeSpec path argument is an empty string, so there is no directory to walk for the java project. The input at fault is the chaincode path supplied to the deploy/package command.

Source

Thrown at core/chaincode/platforms/java/platform.go:95

		//      ISREG      == 0100000
		//      -rw-rw-rw- == 0666
		//
		// Anything else is suspect in this context and will be rejected
		// --------------------------------------------------------------------------------------
		if header.Mode&^0o100666 != 0 {
			return fmt.Errorf("illegal file mode detected for file %s: %o", header.Name, header.Mode)
		}
	}
	return nil
}

// WritePackage writes the java chaincode package
func (p *Platform) GetDeploymentPayload(path string) ([]byte, error) {
	logger.Debugf("Packaging java project from path %s", path)

	if path == "" {
		logger.Error("ChaincodeSpec's path cannot be empty")
		return nil, errors.New("ChaincodeSpec's path cannot be empty")
	}

	// trim trailing slash if it exists
	if path[len(path)-1] == '/' {
		path = path[:len(path)-1]
	}

	buf := &bytes.Buffer{}
	gw := gzip.NewWriter(buf)
	tw := tar.NewWriter(gw)

	excludedDirs := []string{"target", "build", "out"}
	excludedFileTypes := map[string]bool{".class": true}
	err := util.WriteFolderToTarPackage(tw, path, excludedDirs, nil, excludedFileTypes)
	if err != nil {
		logger.Errorf("Error writing java project to tar package %s", err)
		return nil, fmt.Errorf("failed to create chaincode package: %s", err)
	}

View on GitHub (pinned to 2736b63f8f)

Solutions

1. Set the chaincode path in the ChaincodeSpec/deploy request to the Java project root
2. Fix client/CLI flags so the chaincode path is actually passed
3. Check your configuration/templating for a dropped or empty path value

Example fix

// before
spec := &pb.ChaincodeSpec{ChaincodeId: &pb.ChaincodeID{Name: "mycc"}} // Path missing
payload, err := platform.GetDeploymentPayload(spec.ChaincodeId.Path)
// after
spec := &pb.ChaincodeSpec{ChaincodeId: &pb.ChaincodeID{Name: "mycc", Path: "src/chaincode/java/mycc"}}
payload, err := platform.GetDeploymentPayload(spec.ChaincodeId.Path)

func safeGetPayload(p *javaPlatform, path string) ([]byte, error) {
    if strings.TrimSpace(path) == "" { return nil, errors.New("chaincode path must be set before packaging") }
    return p.GetDeploymentPayload(path)
}

payload, err := platform.GetDeploymentPayload(path)
if err != nil && err.Error() == "ChaincodeSpec's path cannot be empty" {
    // surface a config error: the deploy request lacked a path
}

When it happens

Trigger: Calling GetDeploymentPayload("") — typically when the ChaincodeSpec in an install/deploy request omitted the chaincode path field.

Common situations: A client (SDK, CLI) constructing the install request without setting Path; a config file with an empty chaincode.path value; a template that failed to fill in the path field.

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

• failure opening codepackage gzip stream: %s
• illegal file detected in payload: "%s"
• failed to create chaincode package: %s
• did not find a code package inside the package
• did not find any package metadata (missing %s)

AI-assisted analysis of hyperledger/fabric@2736b63f8f (2026-09-04). Data as JSON: /api/errors/bccd5dce4d3600ef. Report an issue: GitHub.