diff --git a/idea-plugin/p3c-common/src/main/java/icons/P3cIcons.java b/idea-plugin/p3c-common/src/main/java/icons/P3cIcons.java
index 71a3d6a9df93b03c43195b23b7681bbd7fbce9c1..a4908c6774e8ec99748dd9dcd03a29883c172b52 100644
--- a/idea-plugin/p3c-common/src/main/java/icons/P3cIcons.java
+++ b/idea-plugin/p3c-common/src/main/java/icons/P3cIcons.java
@@ -23,11 +23,16 @@ import com.intellij.openapi.util.IconLoader;
  * @author caikang
  * @date 2016/12/28
  */
-public interface P3cIcons {
-    Icon ANALYSIS_ACTION = IconLoader.getIcon("/icons/ali-ide-run.png");
+public final class P3cIcons {
+    private P3cIcons() {
+        throw new AssertionError("icons.P3cIcons"
+            + " instances for you!");
+    }
 
-    Icon PROJECT_INSPECTION_ON = IconLoader.getIcon("/icons/qiyong.png");
-    Icon PROJECT_INSPECTION_OFF = IconLoader.getIcon("/icons/tingyong.png");
-    Icon LANGUAGE = IconLoader.getIcon("/icons/language.png");
-    Icon ALIBABA = IconLoader.getIcon("/icons/alibaba.png");
+    public static final Icon ANALYSIS_ACTION = IconLoader.getIcon("/icons/ali-ide-run.png");
+
+    public static final Icon PROJECT_INSPECTION_ON = IconLoader.getIcon("/icons/qiyong.png");
+    public static final Icon PROJECT_INSPECTION_OFF = IconLoader.getIcon("/icons/tingyong.png");
+    public static final Icon LANGUAGE = IconLoader.getIcon("/icons/language.png");
+    public static final Icon ALIBABA = IconLoader.getIcon("/icons/alibaba.png");
 }
diff --git a/idea-plugin/p3c-common/src/main/kotlin/com/alibaba/p3c/idea/action/AliInspectionAction.kt b/idea-plugin/p3c-common/src/main/kotlin/com/alibaba/p3c/idea/action/AliInspectionAction.kt
index 260a232e17eea8d9d3a3321fe01e7d0ca40d6bab..a3ddff9e41d9fb37770e068a877e9eb6abcd84f7 100644
--- a/idea-plugin/p3c-common/src/main/kotlin/com/alibaba/p3c/idea/action/AliInspectionAction.kt
+++ b/idea-plugin/p3c-common/src/main/kotlin/com/alibaba/p3c/idea/action/AliInspectionAction.kt
@@ -20,6 +20,7 @@ import com.alibaba.p3c.idea.compatible.inspection.Inspections
 import com.alibaba.p3c.idea.ep.InspectionActionExtensionPoint
 import com.alibaba.p3c.idea.i18n.P3cBundle
 import com.alibaba.p3c.idea.inspection.AliBaseInspection
+import com.alibaba.p3c.idea.util.NumberConstants
 import com.beust.jcommander.internal.Lists
 import com.intellij.analysis.AnalysisScope
 import com.intellij.analysis.AnalysisUIOptions
@@ -68,7 +69,7 @@ class AliInspectionAction : AnAction() {
         if (psiFile != null) {
             analysisScope = AnalysisScope(psiFile)
             projectDir = isBaseDir(psiFile.virtualFile, project)
-        } else if (virtualFiles != null && virtualFiles.size > com.alibaba.p3c.idea.NumberConstants.INTEGER_SIZE_OR_LENGTH_0) {
+        } else if (virtualFiles != null && virtualFiles.size > NumberConstants.INTEGER_SIZE_OR_LENGTH_0) {
             analysisScope = AnalysisScope(project, Lists.newArrayList<VirtualFile>(*virtualFiles))
             projectDir = virtualFiles.any {
                 isBaseDir(it, project)
diff --git a/idea-plugin/p3c-common/src/main/kotlin/com/alibaba/p3c/idea/compatible/inspection/Inspections.kt b/idea-plugin/p3c-common/src/main/kotlin/com/alibaba/p3c/idea/compatible/inspection/Inspections.kt
index 42d624dad34c001ace688795b6d46525c2b726a9..1c186c4959eb1e5c4b8d6ab88a9339e90e32b587 100644
--- a/idea-plugin/p3c-common/src/main/kotlin/com/alibaba/p3c/idea/compatible/inspection/Inspections.kt
+++ b/idea-plugin/p3c-common/src/main/kotlin/com/alibaba/p3c/idea/compatible/inspection/Inspections.kt
@@ -15,9 +15,11 @@
  */
 package com.alibaba.p3c.idea.compatible.inspection
 
+import com.google.common.base.Splitter
 import com.intellij.codeInspection.ex.InspectionProfileImpl
 import com.intellij.codeInspection.ex.InspectionToolWrapper
 import com.intellij.codeInspection.ex.ScopeToolState
+import com.intellij.codeInspection.javaDoc.JavaDocLocalInspection
 import com.intellij.openapi.project.Project
 
 /**
@@ -32,6 +34,24 @@ object Inspections {
         return getAllTools(project, profile).filter(filter)
     }
 
+    fun addCustomTag(project: Project, tag: String) {
+        val profile = InspectionProfileService.getProjectInspectionProfile(project)
+        val javaDocLocalInspection = profile.getInspectionTool("JavaDoc", project)?.tool
+                as? JavaDocLocalInspection ?: return
+        if (javaDocLocalInspection.myAdditionalJavadocTags.isEmpty()) {
+            javaDocLocalInspection.myAdditionalJavadocTags = tag
+            return
+        }
+
+        val tags = Splitter.on(',').splitToList(javaDocLocalInspection.myAdditionalJavadocTags)
+        if (tags.contains(tag)) {
+            return
+        }
+        javaDocLocalInspection.myAdditionalJavadocTags += "," + tag
+        profile.profileChanged()
+        profile.scopesChanged()
+    }
+
     private fun getAllTools(project: Project, profile: InspectionProfileImpl): List<InspectionToolWrapper<*, *>> {
         val method = InspectionProfileImpl::class.java.methods.first {
             it.name == "getAllTools"
diff --git a/idea-plugin/p3c-common/src/main/kotlin/com/alibaba/p3c/idea/component/AliProjectComponent.kt b/idea-plugin/p3c-common/src/main/kotlin/com/alibaba/p3c/idea/component/AliProjectComponent.kt
index f5ce84931024670fb764fca5d886b70ca5096fbd..ef51918190f637ff4a96bd00413316134d4fdb06 100644
--- a/idea-plugin/p3c-common/src/main/kotlin/com/alibaba/p3c/idea/component/AliProjectComponent.kt
+++ b/idea-plugin/p3c-common/src/main/kotlin/com/alibaba/p3c/idea/component/AliProjectComponent.kt
@@ -15,6 +15,7 @@
  */
 package com.alibaba.p3c.idea.component
 
+import com.alibaba.p3c.idea.compatible.inspection.Inspections
 import com.alibaba.p3c.idea.config.P3cConfig
 import com.alibaba.p3c.idea.inspection.AliPmdInspectionInvoker
 import com.alibaba.p3c.idea.pmd.SourceCodeProcessor
@@ -30,8 +31,10 @@ import com.intellij.psi.PsiManager
  * @author caikang
  * @date 2016/12/13
  */
-class AliProjectComponent(private val project: Project,
-        val p3cConfig: P3cConfig) : AliBaseProjectComponent {
+class AliProjectComponent(
+        private val project: Project,
+        val p3cConfig: P3cConfig
+) : AliBaseProjectComponent {
     private val listener: VirtualFileListener
     private val javaExtension = ".java"
     private val velocityExtension = ".vm"
@@ -56,6 +59,7 @@ class AliProjectComponent(private val project: Project,
     }
 
     override fun projectOpened() {
+        Inspections.addCustomTag(project, "date")
         VirtualFileManager.getInstance().addVirtualFileListener(listener)
     }
 
diff --git a/idea-plugin/p3c-common/src/main/kotlin/com/alibaba/p3c/idea/inspection/AliPmdInspection.kt b/idea-plugin/p3c-common/src/main/kotlin/com/alibaba/p3c/idea/inspection/AliPmdInspection.kt
index 1f170e4da8841561f633ce72407550d44e2b6a9f..54c6b33342a103df4bef01adbe77e174c0a7925f 100644
--- a/idea-plugin/p3c-common/src/main/kotlin/com/alibaba/p3c/idea/inspection/AliPmdInspection.kt
+++ b/idea-plugin/p3c-common/src/main/kotlin/com/alibaba/p3c/idea/inspection/AliPmdInspection.kt
@@ -16,6 +16,7 @@
 package com.alibaba.p3c.idea.inspection
 
 import com.alibaba.p3c.idea.inspection.AliLocalInspectionToolProvider.ShouldInspectChecker
+import com.alibaba.p3c.idea.util.NumberConstants
 import com.alibaba.p3c.idea.util.QuickFixes
 import com.intellij.codeHighlighting.HighlightDisplayLevel
 import com.intellij.codeInspection.InspectionManager
@@ -103,8 +104,8 @@ class AliPmdInspection(private val ruleName: String)
 
         var shortName = "Alibaba" + ruleName
         val index = shortName.lastIndexOf("Rule")
-        if (index > com.alibaba.p3c.idea.NumberConstants.INDEX_0) {
-            shortName = shortName.substring(com.alibaba.p3c.idea.NumberConstants.INDEX_0, index)
+        if (index > NumberConstants.INDEX_0) {
+            shortName = shortName.substring(NumberConstants.INDEX_0, index)
         }
         return shortName
     }
diff --git a/idea-plugin/p3c-common/src/main/kotlin/com/alibaba/p3c/idea/inspection/RuleInspectionUtils.kt b/idea-plugin/p3c-common/src/main/kotlin/com/alibaba/p3c/idea/inspection/RuleInspectionUtils.kt
index fce0372ec256cb0288118a5d10d15752685be3dd..3f0693d7620fb632ae60a9dd1ef5016d74f96810 100644
--- a/idea-plugin/p3c-common/src/main/kotlin/com/alibaba/p3c/idea/inspection/RuleInspectionUtils.kt
+++ b/idea-plugin/p3c-common/src/main/kotlin/com/alibaba/p3c/idea/inspection/RuleInspectionUtils.kt
@@ -17,6 +17,7 @@ package com.alibaba.p3c.idea.inspection
 
 import com.alibaba.p3c.idea.config.P3cConfig
 import com.alibaba.p3c.idea.util.HighlightDisplayLevels
+import com.alibaba.p3c.idea.util.NumberConstants
 import com.alibaba.p3c.pmd.I18nResources
 import com.alibaba.smartfox.idea.common.util.getService
 import com.google.common.base.Joiner
@@ -177,7 +178,7 @@ object RuleInspectionUtils {
         logger.info("start to find rule sets from jar " + url)
         var path = URLDecoder.decode(url.path, StandardCharsets.UTF_8.name())
         val index = path.lastIndexOf(URLUtil.JAR_SEPARATOR)
-        if (index > com.alibaba.p3c.idea.NumberConstants.INDEX_0) {
+        if (index > NumberConstants.INDEX_0) {
             path = path.substring("file:".length, index)
         }
         val jarFile = JarFile(path)
diff --git a/idea-plugin/p3c-common/src/main/kotlin/com/alibaba/p3c/idea/inspection/standalone/MapOrSetKeyShouldOverrideHashCodeEqualsInspection.kt b/idea-plugin/p3c-common/src/main/kotlin/com/alibaba/p3c/idea/inspection/standalone/MapOrSetKeyShouldOverrideHashCodeEqualsInspection.kt
index b0cdd5ccf4a812e2593baefdc0268f18b6d7ec0c..3ecbb31079e4e35a94fa938d1caa4e504119b353 100644
--- a/idea-plugin/p3c-common/src/main/kotlin/com/alibaba/p3c/idea/inspection/standalone/MapOrSetKeyShouldOverrideHashCodeEqualsInspection.kt
+++ b/idea-plugin/p3c-common/src/main/kotlin/com/alibaba/p3c/idea/inspection/standalone/MapOrSetKeyShouldOverrideHashCodeEqualsInspection.kt
@@ -15,8 +15,8 @@
  */
 package com.alibaba.p3c.idea.inspection.standalone
 
-import com.alibaba.p3c.idea.NumberConstants
-import com.alibaba.p3c.idea.ObjectConstants
+import com.alibaba.p3c.idea.util.NumberConstants
+import com.alibaba.p3c.idea.util.ObjectConstants
 import com.alibaba.p3c.idea.i18n.P3cBundle
 import com.alibaba.p3c.idea.inspection.AliBaseInspection
 import com.alibaba.p3c.idea.util.HighlightDisplayLevels
diff --git a/idea-plugin/p3c-common/src/main/java/com/alibaba/p3c/idea/NumberConstants.java b/idea-plugin/p3c-common/src/main/kotlin/com/alibaba/p3c/idea/util/NumberConstants.kt
similarity index 74%
rename from idea-plugin/p3c-common/src/main/java/com/alibaba/p3c/idea/NumberConstants.java
rename to idea-plugin/p3c-common/src/main/kotlin/com/alibaba/p3c/idea/util/NumberConstants.kt
index 7a3610e0620c9dafecb725f5ad6fd596206c76bd..b71c8db7950385cd8ce289d45f41748329eab7cb 100644
--- a/idea-plugin/p3c-common/src/main/java/com/alibaba/p3c/idea/NumberConstants.java
+++ b/idea-plugin/p3c-common/src/main/kotlin/com/alibaba/p3c/idea/util/NumberConstants.kt
@@ -13,17 +13,17 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package com.alibaba.p3c.idea;
+package com.alibaba.p3c.idea.util
 
 /**
  * @author caikang
  * @date 2016/12/28
  */
-public interface NumberConstants {
-    int INTEGER_SIZE_OR_LENGTH_0 = 0;
-    int INTEGER_SIZE_OR_LENGTH_1 = 1;
-    int INTEGER_SIZE_OR_LENGTH_2 = 2;
+object NumberConstants {
+    val INTEGER_SIZE_OR_LENGTH_0 = 0
+    val INTEGER_SIZE_OR_LENGTH_1 = 1
+    val INTEGER_SIZE_OR_LENGTH_2 = 2
 
-    int INDEX_0 = 0;
-    int INDEX_1 = 1;
+    val INDEX_0 = 0
+    val INDEX_1 = 1
 }
diff --git a/idea-plugin/p3c-common/src/main/java/com/alibaba/p3c/idea/ObjectConstants.java b/idea-plugin/p3c-common/src/main/kotlin/com/alibaba/p3c/idea/util/ObjectConstants.kt
similarity index 65%
rename from idea-plugin/p3c-common/src/main/java/com/alibaba/p3c/idea/ObjectConstants.java
rename to idea-plugin/p3c-common/src/main/kotlin/com/alibaba/p3c/idea/util/ObjectConstants.kt
index 2e09e384ca111b09ccc4432e8ebfd43ad4b6cb24..b54ea3fcf9108f3dd3525e98187097583a1b7116 100644
--- a/idea-plugin/p3c-common/src/main/java/com/alibaba/p3c/idea/ObjectConstants.java
+++ b/idea-plugin/p3c-common/src/main/kotlin/com/alibaba/p3c/idea/util/ObjectConstants.kt
@@ -13,18 +13,18 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package com.alibaba.p3c.idea;
+package com.alibaba.p3c.idea.util
 
 /**
  * @author caikang
  * @date 2016/12/28
  */
-public interface ObjectConstants {
-    String METHOD_NAME_EQUALS = "equals";
-    String METHOD_NAME_HASHCODE = "hashCode";
-    String METHOD_NAME_ADD = "add";
-    String METHOD_NAME_PUT = "put";
-    String CLASS_LITERAL = "class";
-    String INTERFACE_LITERAL = "interface";
-    String ENUM_LITERAL = "enum";
+object ObjectConstants {
+    val METHOD_NAME_EQUALS = "equals"
+    val METHOD_NAME_HASHCODE = "hashCode"
+    val METHOD_NAME_ADD = "add"
+    val METHOD_NAME_PUT = "put"
+    val CLASS_LITERAL = "class"
+    val INTERFACE_LITERAL = "interface"
+    val ENUM_LITERAL = "enum"
 }
diff --git a/idea-plugin/p3c-common/src/main/kotlin/com/alibaba/p3c/idea/util/ProblemsUtils.kt b/idea-plugin/p3c-common/src/main/kotlin/com/alibaba/p3c/idea/util/ProblemsUtils.kt
index bdf59da2ce02b4e487d8ddb7f61420f087b5a3d0..75971782b875e79ad6c0bb556ba644bec5fb9f4f 100644
--- a/idea-plugin/p3c-common/src/main/kotlin/com/alibaba/p3c/idea/util/ProblemsUtils.kt
+++ b/idea-plugin/p3c-common/src/main/kotlin/com/alibaba/p3c/idea/util/ProblemsUtils.kt
@@ -111,9 +111,9 @@ object ProblemsUtils {
         if (psiElement == null) {
             return null
         }
-        if (psiElement is PsiKeyword && psiElement.text != null && (com.alibaba.p3c.idea.ObjectConstants.CLASS_LITERAL == psiElement.text
-                || com.alibaba.p3c.idea.ObjectConstants.INTERFACE_LITERAL == psiElement.text
-                || com.alibaba.p3c.idea.ObjectConstants.ENUM_LITERAL == psiElement.text) && psiElement.parent is PsiClass) {
+        if (psiElement is PsiKeyword && psiElement.text != null && (ObjectConstants.CLASS_LITERAL == psiElement.text
+                || ObjectConstants.INTERFACE_LITERAL == psiElement.text
+                || ObjectConstants.ENUM_LITERAL == psiElement.text) && psiElement.parent is PsiClass) {
             val parent = psiElement.parent as PsiClass
             val identifier = parent.nameIdentifier
             return identifier ?: psiElement
@@ -131,4 +131,4 @@ object ProblemsUtils {
                 desc, ProblemHighlightType.GENERIC_ERROR_OR_WARNING,
                 isOnTheFly, quickFix())
     }
-}
\ No newline at end of file
+}
diff --git a/p3c-pmd/src/main/java/com/alibaba/p3c/pmd/lang/java/util/NumberConstants.java b/p3c-pmd/src/main/java/com/alibaba/p3c/pmd/lang/java/util/NumberConstants.java
index d6737fc9b175e79994ccdd904f5d221cc690d286..8316260e8328f4d3c7b9da79d65cf707215446d2 100644
--- a/p3c-pmd/src/main/java/com/alibaba/p3c/pmd/lang/java/util/NumberConstants.java
+++ b/p3c-pmd/src/main/java/com/alibaba/p3c/pmd/lang/java/util/NumberConstants.java
@@ -19,13 +19,18 @@ package com.alibaba.p3c.pmd.lang.java.util;
  * @author caikang
  * @date 2016/12/28
  */
-public interface NumberConstants {
-    int INTEGER_SIZE_OR_LENGTH_0 = 0;
-    int INTEGER_SIZE_OR_LENGTH_1 = 1;
-    int INTEGER_SIZE_OR_LENGTH_2 = 2;
-    int INTEGER_SIZE_OR_LENGTH_3 = 3;
+public final class NumberConstants {
+    private NumberConstants() {
+        throw new AssertionError("com.alibaba.p3c.pmd.lang.java.util.NumberConstants"
+            + " instances for you!");
+    }
 
-    int INDEX_0 = 0;
-    int INDEX_1 = 1;
-    int INDEX_2 = 2;
+    public static final int INTEGER_SIZE_OR_LENGTH_0 = 0;
+    public static final int INTEGER_SIZE_OR_LENGTH_1 = 1;
+    public static final int INTEGER_SIZE_OR_LENGTH_2 = 2;
+    public static final int INTEGER_SIZE_OR_LENGTH_3 = 3;
+
+    public static final int INDEX_0 = 0;
+    public static final int INDEX_1 = 1;
+    public static final int INDEX_2 = 2;
 }
diff --git a/p3c-pmd/src/main/java/com/alibaba/p3c/pmd/lang/java/util/StringAndCharConstants.java b/p3c-pmd/src/main/java/com/alibaba/p3c/pmd/lang/java/util/StringAndCharConstants.java
index a0fe3cfc29aab3ed2dc4c4645d6a6d54a04b1bb4..c7b4757db51f1f07827c8832708f6245c1ae4999 100644
--- a/p3c-pmd/src/main/java/com/alibaba/p3c/pmd/lang/java/util/StringAndCharConstants.java
+++ b/p3c-pmd/src/main/java/com/alibaba/p3c/pmd/lang/java/util/StringAndCharConstants.java
@@ -19,6 +19,11 @@ package com.alibaba.p3c.pmd.lang.java.util;
  * @author caikang
  * @date 2017/03/28
  */
-public interface StringAndCharConstants {
-    char DOT = '.';
+public final class StringAndCharConstants {
+    private StringAndCharConstants(){
+        throw new AssertionError("com.alibaba.p3c.pmd.lang.java.util.StringAndCharConstants"
+            + " instances for you!");
+    }
+
+    public static final char DOT = '.';
 }