diff --git a/cmd/cmd_test.go b/cmd/cmd_test.go
index 8733945..86cf4f0 100644
--- a/cmd/cmd_test.go
+++ b/cmd/cmd_test.go
@@ -1,6 +1,7 @@
 package main
 
 import (
+	"errors"
 	"testing"
 
 	"github.com/onsi/gomega"
@@ -126,3 +127,83 @@ func TestIncidentSelector(t *testing.T) {
 	selector = scope.incidentSelector()
 	g.Expect("(!package||package=a||package=b) && !(package=C||package=D)").To(gomega.Equal(selector))
 }
+
+func TestInjectorDefaults(t *testing.T) {
+	g := gomega.NewGomegaWithT(t)
+	inj := ResourceInjector{dict: make(map[string]any)}
+	r := &Resource{
+		Fields: []Field{
+			{
+				Name:    "Name",
+				Key:     "person.name",
+				Default: "Elmer",
+			},
+			{
+				Name: "Age",
+				Key:  "person.age",
+			},
+		},
+	}
+	err := inj.addDefaults(r)
+	g.Expect(err).To(gomega.BeNil())
+	g.Expect(inj.dict[r.Fields[0].Key]).To(gomega.Equal(r.Fields[0].Default))
+	g.Expect(inj.dict[r.Fields[1].Key]).To(gomega.BeNil())
+}
+
+func TestInjectorTypeCast(t *testing.T) {
+	g := gomega.NewGomegaWithT(t)
+	inj := ResourceInjector{dict: make(map[string]any)}
+	r := &Resource{
+		Fields: []Field{
+			{
+				Name:    "Name",
+				Key:     "person.name",
+				Default: "Elmer",
+			},
+			{
+				Name:    "Age",
+				Key:     "person.age",
+				Type:    "integer",
+				Default: "18",
+			},
+			{
+				Name:    "Resident",
+				Key:     "person.resident",
+				Type:    "boolean",
+				Default: "true",
+			},
+			{
+				Name:    "Member",
+				Key:     "person.member",
+				Type:    "boolean",
+				Default: 1,
+			},
+			{
+				Name:    "One",
+				Key:     "person.one",
+				Type:    "integer",
+				Default: true,
+			},
+		},
+	}
+	err := inj.addDefaults(r)
+	g.Expect(err).To(gomega.BeNil())
+	g.Expect(inj.dict[r.Fields[0].Key]).To(gomega.Equal(r.Fields[0].Default))
+	g.Expect(inj.dict[r.Fields[1].Key]).To(gomega.Equal(18))
+	g.Expect(inj.dict[r.Fields[2].Key]).To(gomega.BeTrue())
+	g.Expect(inj.dict[r.Fields[3].Key]).To(gomega.BeTrue())
+	g.Expect(inj.dict[r.Fields[4].Key]).To(gomega.Equal(1))
+
+	// cast error.
+	inj.dict = make(map[string]any)
+	r.Fields = append(
+		r.Fields,
+		Field{
+			Name:    "Resident",
+			Key:     "person.parent",
+			Type:    "integer",
+			Default: "true",
+		})
+	err = inj.addDefaults(r)
+	g.Expect(errors.Is(err, &TypeError{})).To(gomega.BeTrue())
+}
diff --git a/cmd/injector.go b/cmd/injector.go
index 819d39a..faf17ae 100644
--- a/cmd/injector.go
+++ b/cmd/injector.go
@@ -7,6 +7,7 @@ import (
 	"os"
 	pathlib "path"
 	"regexp"
+	"strconv"
 	"strings"
 
 	"github.com/konveyor/analyzer-lsp/provider"
@@ -14,6 +15,7 @@ import (
 	"github.com/konveyor/tackle2-hub/nas"
 )
 
+// KeyRegex $(variable)
 var (
 	KeyRegex = regexp.MustCompile(`(\$\()([^)]+)(\))`)
 )
@@ -49,11 +51,92 @@ func (e *FieldNotMatched) Is(err error) (matched bool) {
 	return
 }
 
+// TypeError used to report resource field cast error.
+type TypeError struct {
+	Field  *Field
+	Reason string
+	Object any
+}
+
+func (e *TypeError) Error() (s string) {
+	return fmt.Sprintf(
+		"Resource injector: cast failed. field=%s type=%s reason=%s, object:%v",
+		e.Field.Name,
+		e.Field.Type,
+		e.Reason,
+		e.Object)
+}
+
+func (e *TypeError) Is(err error) (matched bool) {
+	var inst *TypeError
+	matched = errors.As(err, &inst)
+	return
+}
+
 // Field injection specification.
 type Field struct {
-	Name string `json:"name"`
-	Path string `json:"path"`
-	Key  string `json:"key"`
+	Name    string `json:"name"`
+	Path    string `json:"path"`
+	Key     string `json:"key"`
+	Type    string `json:"type"`
+	Default any    `json:"default"`
+}
+
+// cast returns object cast as defined by Field.Type.
+func (f *Field) cast(object any) (cast any, err error) {
+	cast = object
+	if f.Type == "" {
+		return
+	}
+	defer func() {
+		if err != nil {
+			err = &TypeError{
+				Field:  f,
+				Reason: err.Error(),
+				Object: object,
+			}
+		}
+	}()
+	switch strings.ToLower(f.Type) {
+	case "string":
+		cast = fmt.Sprintf("%v", object)
+	case "integer":
+		switch x := object.(type) {
+		case int,
+			int8,
+			int16,
+			int32,
+			int64:
+			cast = x
+		case bool:
+			cast = 0
+			if x {
+				cast = 1
+			}
+		case string:
+			cast, err = strconv.Atoi(x)
+		default:
+			err = errors.New("expected: integer|boolean|string")
+		}
+	case "boolean":
+		switch x := object.(type) {
+		case bool:
+			cast = x
+		case int,
+			int8,
+			int16,
+			int32,
+			int64:
+			cast = x != 0
+		case string:
+			cast, err = strconv.ParseBool(x)
+		default:
+			err = errors.New("expected: integer|boolean|string")
+		}
+	default:
+		err = errors.New("expected: integer|boolean|string")
+	}
+	return
 }
 
 // Resource injection specification.
@@ -97,8 +180,27 @@ func (p *ParsedSelector) With(s string) {
 }
 
 // ResourceInjector inject resources into extension metadata.
+// Example:
+//   metadata:
+//    provider:
+//      address: localhost:$(PORT)
+//      initConfig:
+//      - providerSpecificConfig:
+//          mavenInsecure: $(maven.insecure)
+//          mavenSettingsFile: $(maven.settings.path)
+//      name: java
+//    resources:
+//    - selector: identity:kind=maven
+//      fields:
+//      - key: maven.settings.path
+//        name: settings
+//        path: /shared/creds/maven/settings.xml
+//    - selector: setting:key=mvn.insecure.enabled
+//      fields:
+//      - key: maven.insecure
+//        name: value
 type ResourceInjector struct {
-	dict map[string]string
+	dict map[string]any
 }
 
 // Inject resources into extension metadata.
@@ -126,11 +228,14 @@ func (r *ResourceInjector) Inject(extension *api.Extension) (p *provider.Config,
 
 // build builds resource dictionary.
 func (r *ResourceInjector) build(md *Metadata) (err error) {
-	r.dict = make(map[string]string)
+	r.dict = make(map[string]any)
 	application, err := addon.Task.Application()
 	if err != nil {
 		return
 	}
+	for _, resource := range md.Resources {
+		err = r.addDefaults(&resource)
+	}
 	for _, resource := range md.Resources {
 		parsed := ParsedSelector{}
 		parsed.With(resource.Selector)
@@ -165,6 +270,20 @@ func (r *ResourceInjector) build(md *Metadata) (err error) {
 	return
 }
 
+// addDefaults adds defaults when specified.
+func (r *ResourceInjector) addDefaults(resource *Resource) (err error) {
+	for _, f := range resource.Fields {
+		if f.Default == nil {
+			continue
+		}
+		err = r.addField(&f, f.Default)
+		if err != nil {
+			return
+		}
+	}
+	return
+}
+
 // add the resource fields specified in the injector.
 func (r *ResourceInjector) add(resource *Resource, object any) (err error) {
 	mp := r.asMap(object)
@@ -177,30 +296,49 @@ func (r *ResourceInjector) add(resource *Resource, object any) (err error) {
 			}
 			return
 		}
-		fv := r.string(v)
-		if f.Path != "" {
-			err = r.write(f.Path, fv)
-			if err != nil {
-				return
-			}
-			fv = f.Path
+		err = r.addField(&f, v)
+		if err != nil {
+			return
 		}
-		r.dict[f.Key] = fv
 	}
 	return
 }
 
+// addField adds field to the dict.
+// When field has a path defined, the values is written to the
+// file and the dict[key] = path.
+func (r *ResourceInjector) addField(f *Field, v any) (err error) {
+	if f.Path != "" {
+		err = r.write(f.Path, v)
+		if err != nil {
+			return
+		}
+		v = f.Path
+	} else {
+		v, err = f.cast(v)
+		if err != nil {
+			return
+		}
+	}
+	r.dict[f.Key] = v
+	return
+}
+
 // write a resource field value to a file.
-func (r *ResourceInjector) write(path string, s string) (err error) {
+func (r *ResourceInjector) write(path string, object any) (err error) {
 	err = nas.MkDir(pathlib.Dir(path), 0755)
 	if err != nil {
 		return
 	}
 	f, err := os.Create(path)
-	if err == nil {
-		_, err = f.Write([]byte(s))
-		_ = f.Close()
+	if err != nil {
+		return
 	}
+	defer func() {
+		_ = f.Close()
+	}()
+	s := r.string(object)
+	_, err = f.Write([]byte(s))
 	return
 }
 
@@ -249,11 +387,17 @@ func (r *ResourceInjector) inject(in any) (out any) {
 			if len(match) < 3 {
 				break
 			}
-			node = strings.Replace(
-				node,
-				match[0],
-				r.dict[match[2]],
-				-1)
+			v := r.dict[match[2]]
+			if len(node) > len(match[0]) {
+				node = strings.Replace(
+					node,
+					match[0],
+					r.string(v),
+					-1)
+			} else {
+				out = v
+				return
+			}
 		}
 		out = node
 	default: