diff --git a/src/brut/androlib/res/ResSmaliUpdater.java b/src/brut/androlib/res/ResSmaliUpdater.java
index c04bc2f1..9771b73d 100644
--- a/src/brut/androlib/res/ResSmaliUpdater.java
+++ b/src/brut/androlib/res/ResSmaliUpdater.java
@@ -18,7 +18,7 @@
 package brut.androlib.res;
 
 import brut.androlib.AndrolibException;
-import brut.androlib.err.UndefinedResourceSpec;
+import brut.androlib.err.UndefinedResObject;
 import brut.androlib.res.data.ResResSpec;
 import brut.androlib.res.data.ResTable;
 import brut.directory.Directory;
@@ -123,7 +123,7 @@ public class ResSmaliUpdater {
                         ResResSpec spec = resTable.getResSpec(resID);
                         out.println(String.format(
                         RES_NAME_FORMAT, spec.getFullName()));
-                    } catch (UndefinedResourceSpec ex) {
+                    } catch (UndefinedResObject ex) {
                         if (! R_FILE_PATTERN.matcher(fileName).matches()) {
                             System.err.println(String.format(
                                 "warning: undefined resource spec in %s: 0x%08x"
diff --git a/src/brut/androlib/res/data/ResConfig.java b/src/brut/androlib/res/data/ResConfig.java
index e0d9d5a7..04f8236e 100644
--- a/src/brut/androlib/res/data/ResConfig.java
+++ b/src/brut/androlib/res/data/ResConfig.java
@@ -18,6 +18,7 @@
 package brut.androlib.res.data;
 
 import brut.androlib.AndrolibException;
+import brut.androlib.err.UndefinedResObject;
 import java.util.*;
 
 /**
@@ -39,8 +40,8 @@ public class ResConfig {
     public ResResource getResource(ResResSpec spec) throws AndrolibException {
         ResResource res = mResources.get(spec);
         if (res == null) {
-            throw new AndrolibException(String.format(
-                "Undefined resource: spec=%s, config=%s", spec, this));
+            throw new UndefinedResObject(String.format(
+                "resource: spec=%s, config=%s", spec, this));
         }
         return res;
     }
diff --git a/src/brut/androlib/res/data/ResPackage.java b/src/brut/androlib/res/data/ResPackage.java
index 84e31298..f2d10081 100644
--- a/src/brut/androlib/res/data/ResPackage.java
+++ b/src/brut/androlib/res/data/ResPackage.java
@@ -17,7 +17,7 @@
 
 package brut.androlib.res.data;
 
-import brut.androlib.err.UndefinedResourceSpec;
+import brut.androlib.err.UndefinedResObject;
 import brut.androlib.AndrolibException;
 import brut.androlib.res.data.value.ResFileValue;
 import brut.androlib.res.data.value.ResValue;
@@ -59,10 +59,10 @@ public class ResPackage {
         return mResSpecs.containsKey(resID);
     }
 
-    public ResResSpec getResSpec(ResID resID) throws UndefinedResourceSpec {
+    public ResResSpec getResSpec(ResID resID) throws UndefinedResObject {
         ResResSpec spec = mResSpecs.get(resID);
         if (spec == null) {
-            throw new UndefinedResourceSpec(resID.toString());
+            throw new UndefinedResObject("resource spec: " + resID.toString());
         }
         return spec;
     }
@@ -78,7 +78,7 @@ public class ResPackage {
     public ResConfig getConfig(ResConfigFlags flags) throws AndrolibException {
         ResConfig config = mConfigs.get(flags);
         if (config == null) {
-            throw new AndrolibException("Undefined config: " + flags);
+            throw new UndefinedResObject("config: " + flags);
         }
         return config;
     }
@@ -94,7 +94,7 @@ public class ResPackage {
     public ResType getType(String typeName) throws AndrolibException {
         ResType type = mTypes.get(typeName);
         if (type == null) {
-            throw new AndrolibException("Undefined type: " + typeName);
+            throw new UndefinedResObject("type: " + typeName);
         }
         return type;
     }
diff --git a/src/brut/androlib/res/data/ResResSpec.java b/src/brut/androlib/res/data/ResResSpec.java
index ade038d9..69a60291 100644
--- a/src/brut/androlib/res/data/ResResSpec.java
+++ b/src/brut/androlib/res/data/ResResSpec.java
@@ -18,6 +18,7 @@
 package brut.androlib.res.data;
 
 import brut.androlib.AndrolibException;
+import brut.androlib.err.UndefinedResObject;
 import java.util.*;
 
 /**
@@ -50,8 +51,8 @@ public class ResResSpec {
             throws AndrolibException {
         ResResource res = mResources.get(config);
         if (res == null) {
-            throw new AndrolibException(String.format(
-                "Undefined resource: spec=%s, config=%s", this, config));
+            throw new UndefinedResObject(String.format(
+                "resource: spec=%s, config=%s", this, config));
         }
         return res;
     }
diff --git a/src/brut/androlib/res/data/ResTable.java b/src/brut/androlib/res/data/ResTable.java
index 68ab4b0d..1d48e65d 100644
--- a/src/brut/androlib/res/data/ResTable.java
+++ b/src/brut/androlib/res/data/ResTable.java
@@ -18,12 +18,10 @@
 package brut.androlib.res.data;
 
 import brut.androlib.AndrolibException;
-import brut.androlib.res.data.value.ResAttr;
+import brut.androlib.err.UndefinedResObject;
 import brut.androlib.res.data.value.ResValue;
-import brut.androlib.res.data.value.ResValueFactory;
 import java.util.HashMap;
 import java.util.LinkedHashSet;
-import java.util.List;
 import java.util.Map;
 import java.util.Set;
 
@@ -56,8 +54,8 @@ public class ResTable {
     public ResPackage getPackage(int id) throws AndrolibException {
         ResPackage pkg = mPackagesById.get(id);
         if (pkg == null) {
-            throw new AndrolibException(String.format(
-                "Undefined package: id=%d", id));
+            throw new UndefinedResObject(String.format(
+                "package: id=%d", id));
         }
         return pkg;
     }
@@ -65,7 +63,7 @@ public class ResTable {
     public ResPackage getPackage(String name) throws AndrolibException {
         ResPackage pkg = mPackagesByName.get(name);
         if (pkg == null) {
-            throw new AndrolibException("Undefined package: name=" + name);
+            throw new UndefinedResObject("package: name=" + name);
         }
         return pkg;
     }
diff --git a/src/brut/androlib/res/data/ResType.java b/src/brut/androlib/res/data/ResType.java
index b71f5281..962b59c3 100644
--- a/src/brut/androlib/res/data/ResType.java
+++ b/src/brut/androlib/res/data/ResType.java
@@ -18,14 +18,8 @@
 package brut.androlib.res.data;
 
 import brut.androlib.AndrolibException;
-import brut.androlib.res.AndrolibResources;
-import brut.androlib.res.decoder.ResFileDecoder;
-import brut.androlib.res.decoder.ResXmlSerializer;
-import brut.directory.Directory;
-import brut.directory.DirectoryException;
-import java.io.IOException;
+import brut.androlib.err.UndefinedResObject;
 import java.util.*;
-import java.util.Map.Entry;
 
 /**
  * @author Ryszard Wiśniewski <brut.alll@gmail.com>
@@ -57,8 +51,8 @@ public final class ResType {
     public ResResSpec getResSpec(String name) throws AndrolibException {
         ResResSpec spec = mResSpecs.get(name);
         if (spec == null) {
-            throw new AndrolibException(String.format(
-                "Undefined resource spec: %s/%s", getName(), name));
+            throw new UndefinedResObject(String.format(
+                "resource spec: %s/%s", getName(), name));
         }
         return spec;
     }