diff --git a/src/main/idea/io/github/linwancen/plugin/show/java/JsonJumpJava.java b/src/main/idea/io/github/linwancen/plugin/show/java/JsonJumpJava.java
index 85971dc..b5893cc 100644
--- a/src/main/idea/io/github/linwancen/plugin/show/java/JsonJumpJava.java
+++ b/src/main/idea/io/github/linwancen/plugin/show/java/JsonJumpJava.java
@@ -59,7 +59,7 @@ public class JsonJumpJava extends PsiReferenceContributor {
                             @NotNull Project project = element.getProject();
                             @NotNull List<PsiField> psiFields = new ArrayList<>();
                             @NotNull List<PsiField> tips = new ArrayList<>();
-                            @NotNull PsiClass[] psiClasses = PsiClassUtils.encClass(virtualFile, project);
+                            @NotNull PsiClass[] psiClasses = PsiClassUtils.fileToClasses(virtualFile, project);
                             @NotNull List<String> jsonPath = jsonPath(jsonProp);
                             put(project, psiFields, tips, psiClasses, jsonPath, jsonPath.size() - 1);
 
diff --git a/src/main/idea/io/github/linwancen/plugin/show/java/doc/OwnerToPsiDocUtils.java b/src/main/idea/io/github/linwancen/plugin/show/java/doc/OwnerToPsiDocUtils.java
index 3bfa6f0..7abf834 100644
--- a/src/main/idea/io/github/linwancen/plugin/show/java/doc/OwnerToPsiDocUtils.java
+++ b/src/main/idea/io/github/linwancen/plugin/show/java/doc/OwnerToPsiDocUtils.java
@@ -1,7 +1,13 @@
 package io.github.linwancen.plugin.show.java.doc;
 
 import com.intellij.openapi.vfs.VirtualFile;
-import com.intellij.psi.*;
+import com.intellij.psi.PsiClass;
+import com.intellij.psi.PsiClassOwner;
+import com.intellij.psi.PsiDirectory;
+import com.intellij.psi.PsiDocCommentOwner;
+import com.intellij.psi.PsiElement;
+import com.intellij.psi.PsiFile;
+import com.intellij.psi.PsiPackage;
 import com.intellij.psi.javadoc.PsiDocComment;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
@@ -59,7 +65,7 @@ public class OwnerToPsiDocUtils {
             // for "xxx ClassName.xxx"
             if (psiClasses.length == 0) {
                 VirtualFile virtualFile = psiFile.getVirtualFile();
-                psiClasses = PsiClassUtils.encClass(virtualFile, psiFile.getProject());
+                psiClasses = PsiClassUtils.fileToClasses(virtualFile, psiFile.getProject());
             }
             for (@NotNull PsiClass psiClass : psiClasses) {
                 @Nullable PsiDocComment docComment = srcOrByteCodeDoc(psiClass);
diff --git a/src/main/idea/io/github/linwancen/plugin/show/java/doc/PsiClassUtils.java b/src/main/idea/io/github/linwancen/plugin/show/java/doc/PsiClassUtils.java
index 56742bc..71d720f 100644
--- a/src/main/idea/io/github/linwancen/plugin/show/java/doc/PsiClassUtils.java
+++ b/src/main/idea/io/github/linwancen/plugin/show/java/doc/PsiClassUtils.java
@@ -20,8 +20,12 @@ public class PsiClassUtils {
     private static final Pattern JSON_PATTERN = Pattern.compile("[\\w.]*+$");
 
     @NotNull
-    public static PsiClass[] encClass(@NotNull VirtualFile virtualFile, @NotNull Project project) {
+    public static PsiClass[] fileToClasses(@NotNull VirtualFile virtualFile, @NotNull Project project) {
         @NotNull String fileName = virtualFile.getNameWithoutExtension();
+        @Nullable String ext = virtualFile.getExtension();
+        if (ext == null || (!ext.startsWith("json") && !ext.equals("xml"))) {
+            return PsiClass.EMPTY_ARRAY;
+        }
         @NotNull Matcher matcher = JSON_PATTERN.matcher(fileName);
         if (!matcher.find()) {
             return PsiClass.EMPTY_ARRAY;
@@ -35,7 +39,7 @@ public class PsiClassUtils {
             return psiClasses;
         }
         // issue #23
-        if (virtualFile.getExtension() == null || className.length() != fileName.length()) {
+        if (className.length() != fileName.length()) {
             return PsiClass.EMPTY_ARRAY;
         }
         @NotNull char[] chars = fileName.toCharArray();