diff --git a/src/main/idea/io/github/linwancen/plugin/show/java/JavaLangDoc.java b/src/main/idea/io/github/linwancen/plugin/show/java/JavaLangDoc.java
index 4fb07f1..020a835 100644
--- a/src/main/idea/io/github/linwancen/plugin/show/java/JavaLangDoc.java
+++ b/src/main/idea/io/github/linwancen/plugin/show/java/JavaLangDoc.java
@@ -170,7 +170,7 @@ public class JavaLangDoc extends BaseTagLangDoc<PsiDocComment> {
             @Nullable PsiDocTagValue value = tag.getValueElement();
             if (value != null) {
                 DocFilter.addHtml(tagStrBuilder, value.getText());
-            } else  {
+            } else {
                 @NotNull PsiElement[] dataElements = tag.getDataElements();
                 if (dataElements.length > 0) {
                     DocFilter.addHtml(tagStrBuilder, dataElements[0].getText());
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 f18754b..35f144d 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
@@ -5,7 +5,13 @@ import com.intellij.json.psi.JsonStringLiteral;
 import com.intellij.openapi.project.Project;
 import com.intellij.openapi.vfs.VirtualFile;
 import com.intellij.patterns.PlatformPatterns;
-import com.intellij.psi.*;
+import com.intellij.psi.PsiClass;
+import com.intellij.psi.PsiElement;
+import com.intellij.psi.PsiField;
+import com.intellij.psi.PsiReference;
+import com.intellij.psi.PsiReferenceContributor;
+import com.intellij.psi.PsiReferenceProvider;
+import com.intellij.psi.PsiReferenceRegistrar;
 import com.intellij.psi.util.PsiTreeUtil;
 import com.intellij.util.ProcessingContext;
 import io.github.linwancen.plugin.show.java.doc.PsiClassUtils;
@@ -38,28 +44,33 @@ public class JsonJumpJava extends PsiReferenceContributor {
                     @Override
                     public @NotNull PsiReference[] getReferencesByElement(@NotNull PsiElement element,
                                                                           @NotNull ProcessingContext context) {
-                        @Nullable JsonProperty jsonProp = PsiTreeUtil.getParentOfType(
-                                element, JsonProperty.class, true);
-                        if (jsonProp == null) {
-                            return PsiReference.EMPTY_ARRAY;
-                        }
-                        VirtualFile virtualFile = element.getContainingFile().getVirtualFile();
-                        if (virtualFile == null) {
-                            return PsiReference.EMPTY_ARRAY;
-                        }
+                        try {
+                            @Nullable JsonProperty jsonProp = PsiTreeUtil.getParentOfType(
+                                    element, JsonProperty.class, true);
+                            if (jsonProp == null) {
+                                return PsiReference.EMPTY_ARRAY;
+                            }
+                            VirtualFile virtualFile = element.getContainingFile().getVirtualFile();
+                            if (virtualFile == null) {
+                                return PsiReference.EMPTY_ARRAY;
+                            }
 
-                        @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 List<String> jsonPath = jsonPath(jsonProp);
-                        put(project, psiFields, tips, psiClasses, jsonPath, jsonPath.size() - 1);
+                            @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 List<String> jsonPath = jsonPath(jsonProp);
+                            put(project, psiFields, tips, psiClasses, jsonPath, jsonPath.size() - 1);
 
-                        @NotNull List<PsiReference> list = new ArrayList<>();
-                        for (@NotNull PsiField psiField : psiFields) {
-                            list.add(new JsonRef<>(element, psiField, tips));
+                            @NotNull List<PsiReference> list = new ArrayList<>();
+                            for (@NotNull PsiField psiField : psiFields) {
+                                list.add(new JsonRef<>(element, psiField, tips));
+                            }
+                            return list.toArray(PsiReference.EMPTY_ARRAY);
+                        } catch (Throwable e) {
+                            LOG.error("JsonJumpJava.register catch Throwable but log to record.", e);
                         }
-                        return list.toArray(PsiReference.EMPTY_ARRAY);
+                        return PsiReference.EMPTY_ARRAY;
                     }
                 });
     }
diff --git a/src/main/java/io/github/linwancen/plugin/show/ext/conf/listener/ConfFileInitListener.java b/src/main/java/io/github/linwancen/plugin/show/ext/conf/listener/ConfFileInitListener.java
index e262eb1..925a57e 100644
--- a/src/main/java/io/github/linwancen/plugin/show/ext/conf/listener/ConfFileInitListener.java
+++ b/src/main/java/io/github/linwancen/plugin/show/ext/conf/listener/ConfFileInitListener.java
@@ -24,7 +24,7 @@ public class ConfFileInitListener implements DumbService.DumbModeListener, Proje
     public void exitDumbMode() {
         try {
             @NotNull Project[] projects = ProjectManager.getInstance().getOpenProjects();
-            for (Project project : projects) {
+            for (@NotNull Project project : projects) {
                 PROJECT_LOAD_MAP.computeIfAbsent(project, k -> {
                     ConfCache.loadAll(project);
                     return true;
diff --git a/src/main/java/io/github/linwancen/plugin/show/lang/RustLangDoc.java b/src/main/java/io/github/linwancen/plugin/show/lang/RustLangDoc.java
index 410aa22..b5b010b 100644
--- a/src/main/java/io/github/linwancen/plugin/show/lang/RustLangDoc.java
+++ b/src/main/java/io/github/linwancen/plugin/show/lang/RustLangDoc.java
@@ -31,7 +31,7 @@ public class RustLangDoc extends BaseLangDoc {
     @Nullable
     @Override
     protected <T extends SettingsInfo> String resolveDocPrint(@NotNull T info, @NotNull PsiElement resolve) {
-        String s = super.resolveDocPrint(info, resolve);
+        @Nullable String s = super.resolveDocPrint(info, resolve);
         if (s != null && s.startsWith("!")) {
             return s.substring(1);
         }
diff --git a/src/main/java/io/github/linwancen/plugin/show/lang/base/BaseLangDoc.java b/src/main/java/io/github/linwancen/plugin/show/lang/base/BaseLangDoc.java
index 63cf4f4..105a2de 100644
--- a/src/main/java/io/github/linwancen/plugin/show/lang/base/BaseLangDoc.java
+++ b/src/main/java/io/github/linwancen/plugin/show/lang/base/BaseLangDoc.java
@@ -181,7 +181,7 @@ public abstract class BaseLangDoc extends EditorLinePainter {
         }
         @NotNull String cutDoc = DocFilter.cutDoc(s, info, true);
         @NotNull String filterDoc = DocFilter.filterDoc(cutDoc, info.globalSettings, info.projectSettings);
-        String trimDoc = filterDoc.trim();
+        @NotNull String trimDoc = filterDoc.trim();
         if (trimDoc.isEmpty()) {
             return null;
         }