diff --git a/jap-core/src/main/java/com/fujieid/jap/core/annotation/NotEmpty.java b/jap-core/src/main/java/com/fujieid/jap/core/annotation/NotEmpty.java
new file mode 100644
index 0000000000000000000000000000000000000000..7124db7896f822feb424f61ea1b28644953c494f
--- /dev/null
+++ b/jap-core/src/main/java/com/fujieid/jap/core/annotation/NotEmpty.java
@@ -0,0 +1,41 @@
+/*
+ * Copyright (c) 2020-2040, 北京符节科技有限公司 (support@fujieid.com & https://www.fujieid.com).
+ * <p>
+ * Licensed under the GNU LESSER GENERAL PUBLIC LICENSE 3.0;
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * <p>
+ * http://www.gnu.org/licenses/lgpl.html
+ * <p>
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.fujieid.jap.core.annotation;
+
+import java.lang.annotation.*;
+
+/**
+ * The annotated element must not be {@code null} nor empty. Supported types are:
+ * <ul>
+ * <li>{@code CharSequence} (length of character sequence is evaluated)</li>
+ * <li>{@code Collection} (collection size is evaluated)</li>
+ * <li>{@code Map} (map size is evaluated)</li>
+ * <li>Array (array length is evaluated)</li>
+ * </ul>
+ *
+ * @author yadong.zhang (yadong.zhang0415(a)gmail.com)
+ * @version 1.0.0
+ * @since 1.0.6
+ */
+@Documented
+@Retention(RetentionPolicy.RUNTIME)
+@Target({ElementType.FIELD, ElementType.PARAMETER})
+public @interface NotEmpty {
+
+    String value() default "";
+
+    String message();
+}
diff --git a/jap-core/src/main/java/com/fujieid/jap/core/util/JapValidator.java b/jap-core/src/main/java/com/fujieid/jap/core/util/JapValidator.java
new file mode 100644
index 0000000000000000000000000000000000000000..27d8db25d80adcbfb26b0fd195982cde9e330054
--- /dev/null
+++ b/jap-core/src/main/java/com/fujieid/jap/core/util/JapValidator.java
@@ -0,0 +1,60 @@
+/*
+ * Copyright (c) 2020-2040, 北京符节科技有限公司 (support@fujieid.com & https://www.fujieid.com).
+ * <p>
+ * Licensed under the GNU LESSER GENERAL PUBLIC LICENSE 3.0;
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * <p>
+ * http://www.gnu.org/licenses/lgpl.html
+ * <p>
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.fujieid.jap.core.util;
+
+import cn.hutool.core.util.ArrayUtil;
+import cn.hutool.core.util.ObjectUtil;
+import cn.hutool.core.util.ReflectUtil;
+import com.fujieid.jap.core.annotation.NotEmpty;
+
+import java.lang.annotation.Annotation;
+import java.lang.reflect.Field;
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * @author yadong.zhang (yadong.zhang0415(a)gmail.com)
+ * @version 1.0.0
+ * @since 1.0.6
+ */
+public class JapValidator {
+
+    public static List<String> validate(Object o) {
+        List<String> errors = new ArrayList<>();
+        if (null == o) {
+            return errors;
+        }
+        Field[] fields = ReflectUtil.getFields(o.getClass());
+        if (ArrayUtil.isEmpty(fields)) {
+            return errors;
+        }
+        for (Field field : fields) {
+            Annotation[] annotations = field.getAnnotations();
+            if (ArrayUtil.isEmpty(annotations)) {
+                return errors;
+            }
+            for (Annotation annotation : annotations) {
+                if (annotation instanceof NotEmpty) {
+                    Object object = ReflectUtil.getFieldValue(o, field);
+                    if (ObjectUtil.isEmpty(object)) {
+                        errors.add(((NotEmpty) annotation).message());
+                    }
+                }
+            }
+        }
+        return errors;
+    }
+}
diff --git a/jap-ldap/src/main/java/com/fujieid/jap/ldap/LdapConfig.java b/jap-ldap/src/main/java/com/fujieid/jap/ldap/LdapConfig.java
index ed0b978e421cac1a1cef23124e93621dc774dc7a..8d82d382cb59a0f8f8973b079c667a5bb1ccb146 100644
--- a/jap-ldap/src/main/java/com/fujieid/jap/ldap/LdapConfig.java
+++ b/jap-ldap/src/main/java/com/fujieid/jap/ldap/LdapConfig.java
@@ -15,6 +15,7 @@
  */
 package com.fujieid.jap.ldap;
 
+import com.fujieid.jap.core.annotation.NotEmpty;
 import com.fujieid.jap.core.config.AuthenticateConfig;
 
 /**
@@ -26,18 +27,22 @@ public class LdapConfig extends AuthenticateConfig {
     /**
      * LDAP data source URL, such as ldap://localhost:389
      */
+    @NotEmpty(message = "LDAP data source URL cannot be empty.")
     private String url;
     /**
      * LDAP user name, such as: cn=admin,dc=example,dc=org
      */
+    @NotEmpty(message = "LDAP bindDn cannot be empty.")
     private String bindDn;
     /**
-     * LDAP user password
+     * LDAP administrator password
      */
+    @NotEmpty(message = "LDAP administrator password cannot be empty")
     private String credentials;
     /**
      * Basic catalog
      */
+    @NotEmpty(message = "LDAP Basic catalog cannot be empty")
     private String baseDn;
     /**
      * Query conditions, such as: (&(objectClass=organizationalPerson)(uid=%s))
diff --git a/jap-ldap/src/test/java/com/fujieid/jap/ldap/LdapConfigTest.java b/jap-ldap/src/test/java/com/fujieid/jap/ldap/LdapConfigTest.java
new file mode 100644
index 0000000000000000000000000000000000000000..f51ae8648c2f3703b2bc2704887956b75dd84caa
--- /dev/null
+++ b/jap-ldap/src/test/java/com/fujieid/jap/ldap/LdapConfigTest.java
@@ -0,0 +1,40 @@
+/*
+ * Copyright (c) 2020-2040, 北京符节科技有限公司 (support@fujieid.com & https://www.fujieid.com).
+ * <p>
+ * Licensed under the GNU LESSER GENERAL PUBLIC LICENSE 3.0;
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * <p>
+ * http://www.gnu.org/licenses/lgpl.html
+ * <p>
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.fujieid.jap.ldap;
+
+import com.fujieid.jap.core.util.JapValidator;
+import org.junit.Test;
+
+import java.util.List;
+
+/**
+ * @author yadong.zhang (yadong.zhang0415(a)gmail.com)
+ * @version 1.0.0
+ * @since 1.0.0
+ */
+public class LdapConfigTest {
+
+    @Test
+    public void annotationTest() {
+        LdapConfig config = new LdapConfig()
+            .setUrl("1")
+            .setCredentials("a");
+        List<String> errors = JapValidator.validate(config);
+        for (String error : errors) {
+            System.out.println(error);
+        }
+    }
+}