fix: NullPointerException occurred when user dose not exist

wj/src/main/java/com/gm/wj/dao/MenuDAO.java

+package com.gm.wj.dao;
+
+import com.gm.wj.pojo.AdminMenu;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+
+public interface MenuDAO extends JpaRepository<AdminMenu, Integer> {
+     AdminMenu findById(int id);
+}
+

wj/src/main/java/com/gm/wj/pojo/AdminRole.java

+package com.gm.wj.pojo;
+
+import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
+
+import javax.persistence.*;
+
+@Entity
+@Table(name = "admin_role")
+@JsonIgnoreProperties({"handler", "hibernateLazyInitializer"})
+public class AdminRole {
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    @Column(name = "id")
+    int id;
+    String name;
+    String desc_;
+
+    public int getId() {
+        return id;
+    }
+
+    public void setId(int id) {
+        this.id = id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String getDesc_() {
+        return desc_;
+    }
+
+    public void setDesc_(String desc_) {
+        this.desc_ = desc_;
+    }
+}

wj/src/main/java/com/gm/wj/pojo/AdminRoleMenu.java

+package com.gm.wj.pojo;
+
+
+import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
+
+import javax.persistence.*;
+
+@Entity
+@Table(name = "admin_role_menu")
+@JsonIgnoreProperties({"handler", "hibernateLazyInitializer"})
+public class AdminRoleMenu {
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    @Column(name = "id")
+    int id;
+    int rid;
+    int mid;
+
+    public int getId() {
+        return id;
+    }
+
+    public void setId(int id) {
+        this.id = id;
+    }
+
+    public int getRid() {
+        return rid;
+    }
+
+    public void setRid(int rid) {
+        this.rid = rid;
+    }
+
+    public int getMid() {
+        return mid;
+    }
+
+    public void setMid(int mid) {
+        this.mid = mid;
+    }
+}

wj/src/main/java/com/gm/wj/pojo/Menu.java

-package com.gm.wj.pojo;
-
-import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
-
-import javax.persistence.*;
-import java.util.List;
-
-@Entity
-@Table(name = "menu")
-@JsonIgnoreProperties({"handler","hibernateLazyInitializer"})
-public class Menu {
-    @Id
-    @GeneratedValue(strategy = GenerationType.IDENTITY)
-    @Column(name = "id")
-    Long id;
-    String path;
-    String icon;
-    String component;
-    MenuMeta meta;
-    Long parentId;
-    List<Menu> children;
-
-    public Long getId() {
-        return id;
-    }
-
-    public void setId(Long id) {
-        this.id = id;
-    }
-
-    public String getPath() {
-        return path;
-    }
-
-    public void setPath(String path) {
-        this.path = path;
-    }
-
-    public String getIcon() {
-        return icon;
-    }
-
-    public void setIcon(String icon) {
-        this.icon = icon;
-    }
-
-    public String getComponent() {
-        return component;
-    }
-
-    public void setComponent(String component) {
-        this.component = component;
-    }
-
-    public MenuMeta getMeta() {
-        return meta;
-    }
-
-    public void setMeta(MenuMeta meta) {
-        this.meta = meta;
-    }
-
-    public Long getParentId() {
-        return parentId;
-    }
-
-    public void setParentId(Long parentId) {
-        this.parentId = parentId;
-    }
-
-    public List<Menu> getChildren() {
-        return children;
-    }
-
-    public void setChildren(List<Menu> children) {
-        this.children = children;
-    }
-}

wj/src/main/java/com/gm/wj/realm/WJRealm.java

@@ -2,16 +2,14 @@ package com.gm.wj.realm;
 
 import com.gm.wj.pojo.User;
 import com.gm.wj.service.UserService;
-import org.apache.shiro.authc.AuthenticationException;
-import org.apache.shiro.authc.AuthenticationInfo;
-import org.apache.shiro.authc.AuthenticationToken;
-import org.apache.shiro.authc.SimpleAuthenticationInfo;
+import org.apache.shiro.authc.*;
 import org.apache.shiro.authz.AuthorizationInfo;
 import org.apache.shiro.authz.SimpleAuthorizationInfo;
 import org.apache.shiro.realm.AuthorizingRealm;
 import org.apache.shiro.subject.PrincipalCollection;
 import org.apache.shiro.util.ByteSource;
 import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.util.ObjectUtils;
 
 public class WJRealm extends AuthorizingRealm {
 
@@ -30,6 +28,9 @@ public class WJRealm extends AuthorizingRealm {
     protected AuthenticationInfo doGetAuthenticationInfo(AuthenticationToken token) throws AuthenticationException {
         String userName = token.getPrincipal().toString();
         User user = userService.getByUserName(userName);
+        if (ObjectUtils.isEmpty(user)) {
+            throw new UnknownAccountException();
+        }
         String passwordInDB = user.getPassword();
         String salt = user.getSalt();
         SimpleAuthenticationInfo authenticationInfo = new SimpleAuthenticationInfo(userName, passwordInDB, ByteSource.Util.bytes(salt), getName());