diff --git a/pkg/apis/core/v1/types.go b/pkg/apis/core/v1/types.go
index fe9db625..408402fe 100644
--- a/pkg/apis/core/v1/types.go
+++ b/pkg/apis/core/v1/types.go
@@ -19,6 +19,7 @@ package v1
 import (
 	apiv1 "k8s.io/api/core/v1"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/runtime/schema"
 )
 
 //
@@ -675,4 +676,11 @@ type (
 	CanaryConfigStatus struct {
 		Status string `json:"status"`
 	}
+
+	// MetadataAccessor lets you work with object metadata and type metadata
+	// from any of the versioned or internal API objects.
+	MetadataAccessor interface {
+		GetObjectKind() schema.ObjectKind
+		GetObjectMeta() metav1.Object
+	}
 )
diff --git a/pkg/fission-cli/cmd/spec/apply.go b/pkg/fission-cli/cmd/spec/apply.go
index ab9a3b01..f69409ff 100644
--- a/pkg/fission-cli/cmd/spec/apply.go
+++ b/pkg/fission-cli/cmd/spec/apply.go
@@ -115,14 +115,9 @@ func (opts *ApplySubCommand) run(input cli.Input) error {
 			return errors.Wrap(err, "error reading specs")
 		}
 
-		var warnings []string
-		// validate
-		warnings, err = fr.Validate(input)
+		err = Validate(input)
 		if err != nil {
-			return errors.Wrap(err, "error validating specs")
-		}
-		for _, warning := range warnings {
-			console.Warn(warning)
+			return errors.Wrap(err, "abort applying resources")
 		}
 
 		// make changes to the cluster based on the specs
diff --git a/pkg/fission-cli/cmd/spec/list.go b/pkg/fission-cli/cmd/spec/list.go
index 0c165298..7e7c7c11 100644
--- a/pkg/fission-cli/cmd/spec/list.go
+++ b/pkg/fission-cli/cmd/spec/list.go
@@ -26,6 +26,7 @@ import (
 	"github.com/pkg/errors"
 
 	fv1 "github.com/fission/fission/pkg/apis/core/v1"
+	"github.com/fission/fission/pkg/controller/client"
 	"github.com/fission/fission/pkg/fission-cli/cliwrapper/cli"
 	"github.com/fission/fission/pkg/fission-cli/cmd"
 	flagkey "github.com/fission/fission/pkg/fission-cli/flag/key"
@@ -58,56 +59,56 @@ func (opts *ListSubCommand) run(input cli.Input) error {
 		deployID = fr.DeploymentConfig.UID
 	}
 
-	allfn, err := getAllFunctions(opts)
+	allfn, err := getAllFunctions(opts.Client())
 	if err != nil {
 		return errors.Wrap(err, "error getting Functions from all namespaces")
 	}
 	specfns := getAppliedFunctions(allfn, deployID)
 	ShowFunctions(specfns)
 
-	allenvs, err := getAllEnvironments(opts)
+	allenvs, err := getAllEnvironments(opts.Client())
 	if err != nil {
 		return errors.Wrap(err, "error getting Environments from all namespaces")
 	}
 	specenvs := getAppliedEnvironments(allenvs, deployID)
 	ShowEnvironments(specenvs)
 
-	pkglists, err := getAllPackages(opts)
+	pkglists, err := getAllPackages(opts.Client())
 	if err != nil {
 		return errors.Wrap(err, "error getting Packages from all namespaces")
 	}
 	specPkgs := getAppliedPackages(pkglists, deployID)
 	ShowPackages(specPkgs)
 
-	canaryCfgs, err := getAllCanaryConfigs(opts)
+	canaryCfgs, err := getAllCanaryConfigs(opts.Client())
 	if err != nil {
 		return errors.Wrap(err, "error getting Canary Config from all namespaces")
 	}
 	specCanaryCfgs := getAppliedCanaryConfigs(canaryCfgs, deployID)
 	ShowCanaryConfigs(specCanaryCfgs)
 
-	hts, err := getAllHTTPTriggers(opts)
+	hts, err := getAllHTTPTriggers(opts.Client())
 	if err != nil {
 		return errors.Wrap(err, "error getting HTTP Triggers from all namespaces")
 	}
 	specHTTPTriggers := getAppliedHTTPTriggers(hts, deployID)
 	ShowHTTPTriggers(specHTTPTriggers)
 
-	mqts, err := getAllMessageQueueTriggers(opts, input.String(flagkey.MqtMQType))
+	mqts, err := getAllMessageQueueTriggers(opts.Client(), input.String(flagkey.MqtMQType))
 	if err != nil {
 		return errors.Wrap(err, "error getting MessageQueue Triggers from all namespaces")
 	}
 	specMessageQueueTriggers := getAppliedMessageQueueTriggers(mqts, deployID)
 	ShowMQTriggers(specMessageQueueTriggers)
 
-	tts, err := getAllTimeTriggers(opts)
+	tts, err := getAllTimeTriggers(opts.Client())
 	if err != nil {
 		return errors.Wrap(err, "error getting Time Triggers from all namespaces")
 	}
 	specTimeTriggers := getAppliedTimeTriggers(tts, deployID)
 	ShowTimeTriggers(specTimeTriggers)
 
-	kws, err := getAllKubeWatchTriggers(opts)
+	kws, err := getAllKubeWatchTriggers(opts.Client())
 	if err != nil {
 		return errors.Wrap(err, "error getting Kube Watchers from all namespaces")
 	}
@@ -382,8 +383,8 @@ func ShowAppliedKubeWatchers(ws []fv1.KubernetesWatchTrigger) {
 }
 
 // getAllFunctions get lists of functions in all namespaces
-func getAllFunctions(opts *ListSubCommand) ([]fv1.Function, error) {
-	fns, err := opts.Client().V1().Function().List("")
+func getAllFunctions(client client.Interface) ([]fv1.Function, error) {
+	fns, err := client.V1().Function().List("")
 	if err != nil {
 		return nil, errors.Errorf("Unable to get Functions %v", err.Error())
 	}
@@ -391,17 +392,17 @@ func getAllFunctions(opts *ListSubCommand) ([]fv1.Function, error) {
 }
 
 // getAllEnvironments get lists of environments in all namespaces
-func getAllEnvironments(opts *ListSubCommand) ([]fv1.Environment, error) {
-	envs, err := opts.Client().V1().Environment().List("")
+func getAllEnvironments(client client.Interface) ([]fv1.Environment, error) {
+	envs, err := client.V1().Environment().List("")
 	if err != nil {
-		return nil, errors.Errorf("Unable to get Enviornmets %v", err.Error())
+		return nil, errors.Errorf("Unable to get Environments %v", err.Error())
 	}
 	return envs, nil
 }
 
 // getAllPackages get lists of packages in all namespaces
-func getAllPackages(opts *ListSubCommand) ([]fv1.Package, error) {
-	pkgList, err := opts.Client().V1().Package().List("")
+func getAllPackages(client client.Interface) ([]fv1.Package, error) {
+	pkgList, err := client.V1().Package().List("")
 	if err != nil {
 		return nil, errors.Errorf("Unable to get Packages %v", err.Error())
 	}
@@ -409,44 +410,44 @@ func getAllPackages(opts *ListSubCommand) ([]fv1.Package, error) {
 }
 
 // getAllCanaryConfigs get lists of canary configs in all namespaces
-func getAllCanaryConfigs(opts *ListSubCommand) ([]fv1.CanaryConfig, error) {
-	canaryCfgs, err := opts.Client().V1().CanaryConfig().List("")
+func getAllCanaryConfigs(client client.Interface) ([]fv1.CanaryConfig, error) {
+	canaryCfgs, err := client.V1().CanaryConfig().List("")
 	if err != nil {
 		return nil, errors.Errorf("Unable to get Canary Configs %v", err.Error())
 	}
 	return canaryCfgs, nil
 }
 
-// getAllHTTPTriggers get lists of  HTTP Triggers in all namespaces
-func getAllHTTPTriggers(opts *ListSubCommand) ([]fv1.HTTPTrigger, error) {
-	hts, err := opts.Client().V1().HTTPTrigger().List("")
+// getAllHTTPTriggers get lists of HTTP Triggers in all namespaces
+func getAllHTTPTriggers(client client.Interface) ([]fv1.HTTPTrigger, error) {
+	hts, err := client.V1().HTTPTrigger().List("")
 	if err != nil {
 		return nil, errors.Errorf("Unable to get HTTP Triggers %v", err.Error())
 	}
 	return hts, nil
 }
 
-// getAllMessageQueueTriggers get lists of  MessageQueue Triggers in all namespaces
-func getAllMessageQueueTriggers(opts *ListSubCommand, mqttype string) ([]fv1.MessageQueueTrigger, error) {
-	mqts, err := opts.Client().V1().MessageQueueTrigger().List(mqttype, "")
+// getAllMessageQueueTriggers get lists of MessageQueue Triggers in all namespaces
+func getAllMessageQueueTriggers(client client.Interface, mqttype string) ([]fv1.MessageQueueTrigger, error) {
+	mqts, err := client.V1().MessageQueueTrigger().List(mqttype, "")
 	if err != nil {
 		return nil, errors.Errorf("Unable to get MessageQueue Triggers %v", err.Error())
 	}
 	return mqts, nil
 }
 
-// getAllTimeTriggers get lists of  Time Triggers in all namespaces
-func getAllTimeTriggers(opts *ListSubCommand) ([]fv1.TimeTrigger, error) {
-	tts, err := opts.Client().V1().TimeTrigger().List("")
+// getAllTimeTriggers get lists of Time Triggers in all namespaces
+func getAllTimeTriggers(client client.Interface) ([]fv1.TimeTrigger, error) {
+	tts, err := client.V1().TimeTrigger().List("")
 	if err != nil {
 		return nil, errors.Errorf("Unable to get Time Triggers %v", err.Error())
 	}
 	return tts, nil
 }
 
-// getAllKubeWatchTriggers get lists of  Kube Watchers in all namespaces
-func getAllKubeWatchTriggers(opts *ListSubCommand) ([]fv1.KubernetesWatchTrigger, error) {
-	ws, err := opts.Client().V1().KubeWatcher().List("")
+// getAllKubeWatchTriggers get lists of Kube Watchers in all namespaces
+func getAllKubeWatchTriggers(client client.Interface) ([]fv1.KubernetesWatchTrigger, error) {
+	ws, err := client.V1().KubeWatcher().List("")
 	if err != nil {
 		return nil, errors.Errorf("Unable to get Kube Watchers %v", err.Error())
 	}
diff --git a/pkg/fission-cli/cmd/spec/validate.go b/pkg/fission-cli/cmd/spec/validate.go
index 82761702..96a431e5 100644
--- a/pkg/fission-cli/cmd/spec/validate.go
+++ b/pkg/fission-cli/cmd/spec/validate.go
@@ -28,10 +28,12 @@ import (
 	"github.com/pkg/errors"
 
 	fv1 "github.com/fission/fission/pkg/apis/core/v1"
+	"github.com/fission/fission/pkg/controller/client"
 	"github.com/fission/fission/pkg/fission-cli/cliwrapper/cli"
 	"github.com/fission/fission/pkg/fission-cli/cmd"
 	"github.com/fission/fission/pkg/fission-cli/console"
 	"github.com/fission/fission/pkg/fission-cli/util"
+	"github.com/fission/fission/pkg/utils"
 )
 
 type ValidateSubCommand struct {
@@ -57,18 +59,140 @@ func (opts *ValidateSubCommand) run(input cli.Input) error {
 		return errors.Wrap(err, "error reading specs")
 	}
 
+	console.Infof("DeployUID: %v", fr.DeploymentConfig.UID)
+	console.Infof("Resources:\n * %v Functions\n * %v Environments\n * %v Packages \n * %v Http Triggers \n * %v MessageQueue Triggers\n * %v Time Triggers\n * %v Kube Watchers\n * %v ArchiveUploadSpec\n",
+		len(fr.Functions), len(fr.Environments), len(fr.Packages), len(fr.HttpTriggers), len(fr.MessageQueueTriggers), len(fr.TimeTriggers), len(fr.KubernetesWatchTriggers), len(fr.ArchiveUploadSpecs))
+
 	var warnings []string
 	// this does the rest of the checks, like dangling refs
 	warnings, err = fr.Validate(input)
 	if err != nil {
 		return errors.Wrap(err, "error validating specs")
 	}
-	fmt.Printf("Spec validation successful\nSpec contains\n %v Functions\n %v Environments\n %v Packages \n %v Http Triggers \n %v MessageQueue Triggers\n %v Time Triggers\n %v Kube Watchers\n %v ArchiveUploadSpec\n",
-		len(fr.Functions), len(fr.Environments), len(fr.Packages), len(fr.HttpTriggers), len(fr.MessageQueueTriggers), len(fr.TimeTriggers), len(fr.KubernetesWatchTriggers), len(fr.ArchiveUploadSpecs))
+
+	err = resourceConflictCheck(opts.Client(), fr)
+	if err != nil {
+		return errors.Wrap(err, "name conflict error")
+	}
 
 	for _, warning := range warnings {
 		console.Warn(warning)
 	}
+
+	console.Info("Validation Successful")
+
+	return nil
+}
+
+// resourceConflictCheck checks if any of the spec resources with
+// the same name is already present in the same cluster namespace.
+// If a same name resource exists in the same namespace, a name
+// conflict error will be returned.
+func resourceConflictCheck(c client.Interface, fr *FissionResources) error {
+	deployUID := fr.DeploymentConfig.UID
+	result := utils.MultiErrorWithFormat()
+
+	fnList, err := getAllFunctions(c)
+	if err != nil {
+		return errors.Errorf("Unable to get Functions %v", err.Error())
+	}
+	for _, sObj := range fr.Functions {
+		for _, cObj := range fnList {
+			if err := isResourceConflicts(deployUID, &sObj, &cObj); err != nil {
+				result = multierror.Append(result, err)
+				break
+			}
+		}
+	}
+
+	envList, err := getAllEnvironments(c)
+	if err != nil {
+		return errors.Errorf("Unable to get Environments %v", err.Error())
+	}
+	for _, sObj := range fr.Environments {
+		for _, cObj := range envList {
+			if err := isResourceConflicts(deployUID, &sObj, &cObj); err != nil {
+				result = multierror.Append(result, err)
+				break
+			}
+		}
+	}
+
+	pkgList, err := getAllPackages(c)
+	if err != nil {
+		return errors.Errorf("Unable to get Packages %v", err.Error())
+	}
+	for _, sObj := range fr.Packages {
+		for _, cObj := range pkgList {
+			if err := isResourceConflicts(deployUID, &sObj, &cObj); err != nil {
+				result = multierror.Append(result, err)
+				break
+			}
+		}
+	}
+
+	httptriggerList, err := getAllHTTPTriggers(c)
+	if err != nil {
+		return errors.Errorf("Unable to get HTTPTrigger %v", err.Error())
+	}
+	for _, sObj := range fr.HttpTriggers {
+		for _, cObj := range httptriggerList {
+			if err := isResourceConflicts(deployUID, &sObj, &cObj); err != nil {
+				result = multierror.Append(result, err)
+				break
+			}
+		}
+	}
+
+	mqtriggerList, err := getAllMessageQueueTriggers(c, "")
+	if err != nil {
+		return errors.Errorf("Unable to get Message Queue Trigger %v", err.Error())
+	}
+	for _, sObj := range fr.MessageQueueTriggers {
+		for _, cObj := range mqtriggerList {
+			if err := isResourceConflicts(deployUID, &sObj, &cObj); err != nil {
+				result = multierror.Append(result, err)
+				break
+			}
+		}
+	}
+
+	timetriggerList, err := getAllTimeTriggers(c)
+	if err != nil {
+		return errors.Errorf("Unable to get Time Trigger %v", err.Error())
+	}
+	for _, sObj := range fr.TimeTriggers {
+		for _, cObj := range timetriggerList {
+			if err := isResourceConflicts(deployUID, &sObj, &cObj); err != nil {
+				result = multierror.Append(result, err)
+				break
+			}
+		}
+	}
+
+	kubewatchtriggerList, err := getAllKubeWatchTriggers(c)
+	if err != nil {
+		return errors.Errorf("Unable to get Kubernetes Watch Trigger %v", err.Error())
+	}
+	for _, sObj := range fr.KubernetesWatchTriggers {
+		for _, cObj := range kubewatchtriggerList {
+			if err := isResourceConflicts(deployUID, &sObj, &cObj); err != nil {
+				result = multierror.Append(result, err)
+				break
+			}
+		}
+	}
+
+	return result.ErrorOrNil()
+}
+
+func isResourceConflicts(deployUID string, specObj fv1.MetadataAccessor, clusterObj fv1.MetadataAccessor) error {
+	if specObj.GetObjectMeta().GetName() == clusterObj.GetObjectMeta().GetName() &&
+		specObj.GetObjectMeta().GetNamespace() == clusterObj.GetObjectMeta().GetNamespace() &&
+		deployUID != clusterObj.GetObjectMeta().GetAnnotations()[FISSION_DEPLOYMENT_UID_KEY] {
+		return fmt.Errorf("%v: '%v/%v' with different deploy uid already exists",
+			clusterObj.GetObjectKind().GroupVersionKind().Kind, clusterObj.GetObjectMeta().GetName(), clusterObj.GetObjectMeta().GetNamespace())
+	}
 	return nil
 }
 
diff --git a/pkg/fission-cli/console/log.go b/pkg/fission-cli/console/log.go
index e4373113..15a6556d 100644
--- a/pkg/fission-cli/console/log.go
+++ b/pkg/fission-cli/console/log.go
@@ -43,7 +43,11 @@ func Warn(msg interface{}) {
 }
 
 func Info(msg interface{}) {
-	os.Stderr.WriteString(fmt.Sprintf("%v\n", trimNewline(msg)))
+	os.Stdout.WriteString(fmt.Sprintf("%v\n", trimNewline(msg)))
+}
+
+func Infof(format string, args ...interface{}) {
+	os.Stdout.WriteString(fmt.Sprintf("%v\n", trimNewline(fmt.Sprintf(format, args...))))
 }
 
 func Verbose(verbosityLevel int, format string, args ...interface{}) {