我无法将元素添加到列表中？UnsupportedOperationException（无法将位于的资源添加到web应用程序的缓存中）

25-02-06 16

在本文中，我们将为您详细介绍我无法将元素添加到列表中？UnsupportedOperationException的相关知识，并且为您解答关于无法将位于的资源添加到web应用程序的缓存中的疑问，此外，我

在本文中，我们将为您详细介绍我无法将元素添加到列表中？UnsupportedOperationException的相关知识，并且为您解答关于无法将位于的资源添加到web应用程序的缓存中的疑问，此外，我们还会提供一些关于Android-无法创建简单的矩形... UnsupportedOperationException？、Android’InvocationTargetException’和’UnsupportedOperationException’、Cause: java.lang.UnsupportedOperationException、Caused by: java.lang.UnsupportedOperationException的有用信息。

本文目录一览：

我无法将元素添加到列表中？UnsupportedOperationException（无法将位于的资源添加到web应用程序的缓存中）
Android-无法创建简单的矩形... UnsupportedOperationException？
Android’InvocationTargetException’和’UnsupportedOperationException’
Cause: java.lang.UnsupportedOperationException
Caused by: java.lang.UnsupportedOperationException

我无法将元素添加到列表中？UnsupportedOperationException（无法将位于的资源添加到web应用程序的缓存中）

这个清单对象在咬我屁股。

每当我尝试向其中添加元素时，它都会产生以下结果：

Caused by: java.lang.UnsupportedOperationException        at java.util.AbstractList.add(AbstractList.java:148)        at java.util.AbstractList.add(AbstractList.java:108)

产生错误的行无关紧要，但无论如何这里都是这样：

AdventureLobbies.players.add(args[0].toLowerCase());

我不应该静态访问它吗？

变量的实际声明：

AdventureLobbies.players =Arrays.asList(rs.getString("players").toLowerCase().split(","));

有任何想法吗？在Google上找不到任何值得的东西。

答案1

小编典典

Arrays.asList（）将给您返回不可修改的列表，这就是为什么添加失败的原因。尝试使用以下方法创建列表：

AdventureLobbies.players = new ArrayList(Arrays.asList(rs.getString("players").toLowerCase().split(",")));

Android-无法创建简单的矩形... UnsupportedOperationException？

我在使用XML创建简单的圆角矩形时遇到麻烦。每当我尝试将“ corners”元素添加到自定义形状时，都会得到：

java.lang.UnsupportedOperationException（位于android.graphics.Path.addRoundRect（Path.java:514）（位于android.graphics.drawable.GradientDrawable.draw（GradientDrawable.java:314））（位于android.view.View.draw（View.java：
6520）…

res / dawable / rounded_rectangle.xml：

 <shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="rectangle"> 
        <solid android:color="#ffffff"/>

        <stroke android:width="3dp"
                android:color="#ff000000"/>

        <padding android:left="1dp"
                 android:top="1dp"
                 android:right="1dp"
                 android:bottom="1dp"/>

        <corners android:bottomRightRadius="7dp" android:bottomLeftRadius="7dp" 
         android:topLeftRadius="7dp" android:topRightRadius="7dp"/> 
    </shape>

使用上述形状的简单layout.xml：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_height="fill_parent" 
    android:layout_width="fill_parent">

<View android:id="@+id/View01" 
    android:background="@drawable/rounded_rectangle" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent">
</View>
</RelativeLayout>

Fyi，我正在尝试针对Android 2.1进行编译，并且已经安装了Eclipse和Android
SDK的所有最新更新。这种形状是我在另一个网站上看到的东西的直接副本，但是由于某种原因，它不想为我工作。

谢谢。

Android’InvocationTargetException’和’UnsupportedOperationException’

我在OPPO X905和OPPO X907上遇到了问题,两者都是 Android 4.0.3(API等级15),我没有使用任何更高级别的API,我在Google和SO上搜索过,都与我的问题不同,下面是我的xml文件和崩溃日志,在此先感谢.
xml文件:(分隔符的边距最初是7.5dp,这可能是问题吗？)

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/item_full"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="#eff0f7"
    android:baselineAligned="false"
    android:orientation="vertical" >
    <RelativeLayout
        android:id="@+id/item_first_half"
        android:layout_width="match_parent"
        android:layout_height="36dp"
        android:orientation="vertical" >
        <View
            android:id="@+id/first_path"
            android:layout_width="4dp"
            android:layout_height="4dp"
            android:layout_marginLeft="40dp"
            android:layout_marginStart="40dp"
            android:background="@drawable/selector_car_action_path" />
        <ImageView
            android:id="@+id/im_car_direction_icon"
            android:layout_width="28dp"
            android:layout_height="28dp"
            android:layout_gravity="top"
            android:layout_marginLeft="28dp"
            android:layout_marginStart="28dp"
            android:layout_marginTop="4dp"
            android:background="@drawable/selector_car_action_background"
            android:padding="2dp"
            android:src="@drawable/selector_navi_icon_63" />
        <View
            android:id="@+id/second_path"
            android:layout_width="4dp"
            android:layout_height="4dp"
            android:layout_below="@id/im_car_direction_icon"
            android:layout_marginLeft="40dp"
            android:layout_marginStart="40dp"
            android:background="@drawable/selector_car_action_path" />
        <TextView
            android:id="@+id/tv_direction"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_centerVertical="true"
            android:layout_marginEnd="15dp"
            android:layout_marginLeft="68dp"
            android:layout_marginRight="15dp"
            android:layout_marginStart="68dp"
            android:singleLine="true"
            android:text=""
            android:textColor="@drawable/selector_car_route_turn_text"
            android:textSize="16sp" />
    </RelativeLayout>
    <RelativeLayout
        android:id="@+id/item_second_half"
        android:layout_width="match_parent"
        android:layout_height="32dp" >
        <View
            android:id="@+id/third_path"
            android:layout_width="4dp"
            android:layout_height="match_parent"
            android:layout_marginLeft="40dp"
            android:layout_marginStart="40dp"
            android:background="@drawable/selector_car_action_path" />
        <TextView
            android:id="@+id/tv_road_name"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginLeft="68dp"
            android:layout_marginStart="68dp"
            android:layout_marginTop="4dp"
            android:singleLine="true"
            android:text=""
            android:textColor="@drawable/selector_car_route_desc"
            android:textSize="16sp" />
        <TextView
            android:id="@+id/divider_for_road_and_distance"
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:layout_marginEnd="7dp"
            android:layout_marginLeft="7dp"
            android:layout_marginRight="7dp"
            android:layout_marginStart="7dp"
            android:layout_marginTop="4dp"
            android:layout_toEndOf="@id/tv_road_name"
            android:layout_toRightOf="@id/tv_road_name"
            android:singleLine="true"
            android:text="|"
            android:textColor="@drawable/selector_car_route_desc"
            android:textSize="16sp" />
        <TextView
            android:id="@+id/tv_ride_distance"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginEnd="15dp"
            android:layout_marginRight="15dp"
            android:layout_marginTop="4dp"
            android:layout_toEndOf="@id/divider_for_road_and_distance"
            android:layout_toRightOf="@id/divider_for_road_and_distance"
            android:singleLine="true"
            android:text=""
            android:textColor="@drawable/selector_car_route_desc"
            android:textSize="16sp" />
        <View
            android:layout_width="match_parent"
            android:layout_height="1px"
            android:layout_alignParentBottom="true"
            android:layout_marginEnd="15dp"
            android:layout_marginLeft="68dp"
            android:layout_marginRight="15dp"
            android:layout_marginStart="68dp"
            android:background="#dee1f0" />
    </RelativeLayout>
</LinearLayout>

drawable / selector_car_route_desc文件是

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">

    <item android:state_selected="true" android:color="@color/color_999999"/>
    <item android:state_selected="false" android:color="@color/color_333333"/>

</selector>

崩溃日志：

android.view.InflateException: Binary XML file line #106: Error inflating class <unkNown>
android.view.LayoutInflater.createView(LayoutInflater.java:606)
com.android.internal.policy.impl.PhoneLayoutInflater.onCreateView(PhoneLayoutInflater.java:56)
android.view.LayoutInflater.onCreateView(LayoutInflater.java:653)
android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:678)
android.view.LayoutInflater.rInflate(LayoutInflater.java:739)
android.view.LayoutInflater.rInflate(LayoutInflater.java:742)
android.view.LayoutInflater.inflate(LayoutInflater.java:489)
android.view.LayoutInflater.inflate(LayoutInflater.java:396)
android.view.LayoutInflater.inflate(LayoutInflater.java:352)
com.tencent.map.ama.route.ui.view.e.<init>(CarRouteShowItem.java:78)
com.tencent.map.ama.route.ui.view.f.a(CarRouteShowView.java:100)
com.tencent.map.ama.route.ui.view.d.a(CarRouteDetailView.java:37)
com.tencent.map.ama.route.ui.MapStateCarRoute.e(MapStateCarRoute.java:418)
com.tencent.map.ama.route.ui.MapStateCarRoute$1.run(MapStateCarRoute.java:255)
android.os.Handler.handleCallback(Handler.java:605)
android.os.Handler.dispatchMessage(Handler.java:92)
android.os.Looper.loop(Looper.java:137)
android.app.ActivityThread.main(ActivityThread.java:4476)
java.lang.reflect.Method.invokeNative(Native Method)
java.lang.reflect.Method.invoke(Method.java:511)
com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:808)
com.android.internal.os.ZygoteInit.main(ZygoteInit.java:575)
dalvik.system.NativeStart.main(Native Method)
cause by:
java.lang.reflect.InvocationTargetException: null
java.lang.reflect.Constructor.constructNative(Native Method)
java.lang.reflect.Constructor.newInstance(Constructor.java:417)
android.view.LayoutInflater.createView(LayoutInflater.java:586)
com.android.internal.policy.impl.PhoneLayoutInflater.onCreateView(PhoneLayoutInflater.java:56)
android.view.LayoutInflater.onCreateView(LayoutInflater.java:653)
android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:678)
android.view.LayoutInflater.rInflate(LayoutInflater.java:739)
android.view.LayoutInflater.rInflate(LayoutInflater.java:742)
android.view.LayoutInflater.inflate(LayoutInflater.java:489)
android.view.LayoutInflater.inflate(LayoutInflater.java:396)
android.view.LayoutInflater.inflate(LayoutInflater.java:352)
com.tencent.map.ama.route.ui.view.e.<init>(CarRouteShowItem.java:78)
com.tencent.map.ama.route.ui.view.f.a(CarRouteShowView.java:100)
com.tencent.map.ama.route.ui.view.d.a(CarRouteDetailView.java:37)
com.tencent.map.ama.route.ui.MapStateCarRoute.e(MapStateCarRoute.java:418)
com.tencent.map.ama.route.ui.MapStateCarRoute$1.run(MapStateCarRoute.java:255)
android.os.Handler.handleCallback(Handler.java:605)
android.os.Handler.dispatchMessage(Handler.java:92)
android.os.Looper.loop(Looper.java:137)
android.app.ActivityThread.main(ActivityThread.java:4476)
java.lang.reflect.Method.invokeNative(Native Method)
java.lang.reflect.Method.invoke(Method.java:511)
com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:808)
com.android.internal.os.ZygoteInit.main(ZygoteInit.java:575)
dalvik.system.NativeStart.main(Native Method)
cause by:
java.lang.UnsupportedOperationException: Can''t convert to dimension: type=0x12
android.content.res.TypedArray.getDimensionPixelSize(TypedArray.java:463)
android.view.View.<init>(View.java:2849)
android.widget.TextView.<init>(TextView.java:499)
android.widget.TextView.<init>(TextView.java:492)
java.lang.reflect.Constructor.constructNative(Native Method)
java.lang.reflect.Constructor.newInstance(Constructor.java:417)
android.view.LayoutInflater.createView(LayoutInflater.java:586)
com.android.internal.policy.impl.PhoneLayoutInflater.onCreateView(PhoneLayoutInflater.java:56)
android.view.LayoutInflater.onCreateView(LayoutInflater.java:653)
android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:678)
android.view.LayoutInflater.rInflate(LayoutInflater.java:739)
android.view.LayoutInflater.rInflate(LayoutInflater.java:742)
android.view.LayoutInflater.inflate(LayoutInflater.java:489)
android.view.LayoutInflater.inflate(LayoutInflater.java:396)
android.view.LayoutInflater.inflate(LayoutInflater.java:352)
com.tencent.map.ama.route.ui.view.e.<init>(CarRouteShowItem.java:78)
com.tencent.map.ama.route.ui.view.f.a(CarRouteShowView.java:100)
com.tencent.map.ama.route.ui.view.d.a(CarRouteDetailView.java:37)
com.tencent.map.ama.route.ui.MapStateCarRoute.e(MapStateCarRoute.java:418)
com.tencent.map.ama.route.ui.MapStateCarRoute$1.run(MapStateCarRoute.java:255)
android.os.Handler.handleCallback(Handler.java:605)
android.os.Handler.dispatchMessage(Handler.java:92)
android.os.Looper.loop(Looper.java:137)
android.app.ActivityThread.main(ActivityThread.java:4476)
java.lang.reflect.Method.invokeNative(Native Method)
java.lang.reflect.Method.invoke(Method.java:511)
com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:808)
com.android.internal.os.ZygoteInit.main(ZygoteInit.java:575)
dalvik.system.NativeStart.main(Native Method)

CarRouteShowItem.java:78的代码是这样的：

View mView = LayoutInflater.from(mContext).inflate(R.layout.car_route_detail_item,null);

CarRouteShowItem不是View的子代,其代码如下：

public class CarRouteShowItem {

    private Context mContext;

    private View mView;

    public CarRouteShowItem(Context context) {
        mContext = context;

        // mView is used by caller 
        mView = LayoutInflater.from(mContext).inflate(R.layout.car_route_detail_item,null);

        // some view finds 
    }

        // some other methods related with specific logic
}

图形布局可以在Eclipse中从API级别8预览到API级别23,但是当我在API级别15的Android Studio中预览时,它会显示错误消息：无法解析资源@style / Widget.TextView,其他API级别没问题,但我没有使用TextView的样式.

解决方法

你需要的只是一个额外的眼睛:-)

android:layout_height="1px"

希望你现在能看到.第二个RelativeLayout中的最后一个子项,其id为item_second_half,类型为< View,将其更改为

android:layout_height="1dp"

让我尽快回顾一下

Cause: java.lang.UnsupportedOperationException

运行web项目的时候出现以下错误：

### Cause: java.lang.UnsupportedOperationException
   at org.mybatis.spring.MyBatisExceptionTranslator.translateExceptionIfPossible(MyBatisExceptionTranslator.java:77)
   at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:446)
   at com.sun.proxy.$Proxy74.selectList(Unknown Source)
   at org.mybatis.spring.SqlSessionTemplate.selectList(SqlSessionTemplate.java:230)
   at org.apache.ibatis.binding.MapperMethod.executeForMany(MapperMethod.java:137)
   at org.apache.ibatis.binding.MapperMethod.execute(MapperMethod.java:75)
   at org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:59)
   at com.sun.proxy.$Proxy81.getEnjoyCourseByUser(Unknown Source)
   at com.ros.serviceimpl.CourseServiceImpl.getCourseByEngoy(CourseServiceImpl.java:1168)
   at com.ros.controller.CourseController.getCourseByEngoy(CourseController.java:427)
   at com.ros.controller.CourseController$$FastClassBySpringCGLIB$$8a9731c4.invoke(<generated>)
   at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204)
   at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:669)
   at com.ros.controller.CourseController$$EnhancerBySpringCGLIB$$3f51ab5d.getCourseByEngoy(<generated>)
   at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
   at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
   at java.lang.reflect.Method.invoke(Method.java:498)
   at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:205)
   at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:133)
   at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:97)
   at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:827)
   at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:738)
   at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85)
   at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:967)
   at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:901)
   at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970)
   at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:872)
   at javax.servlet.http.HttpServlet.service(HttpServlet.java:661)
   at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846)
   at javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
   at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
   at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
   at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
   at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
   at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
   at org.apache.shiro.web.servlet.ProxiedFilterChain.doFilter(ProxiedFilterChain.java:61)
   at org.apache.shiro.web.servlet.AdviceFilter.executeChain(AdviceFilter.java:108)
   at org.apache.shiro.web.servlet.AdviceFilter.doFilterInternal(AdviceFilter.java:137)
   at org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:125)
   at org.apache.shiro.web.servlet.ProxiedFilterChain.doFilter(ProxiedFilterChain.java:66)
   at org.apache.shiro.web.servlet.AbstractShiroFilter.executeChain(AbstractShiroFilter.java:449)
   at org.apache.shiro.web.servlet.AbstractShiroFilter$1.call(AbstractShiroFilter.java:365)
   at org.apache.shiro.subject.support.SubjectCallable.doCall(SubjectCallable.java:90)
   at org.apache.shiro.subject.support.SubjectCallable.call(SubjectCallable.java:83)
   at org.apache.shiro.subject.support.DelegatingSubject.execute(DelegatingSubject.java:387)
   at org.apache.shiro.web.servlet.AbstractShiroFilter.doFilterInternal(AbstractShiroFilter.java:362)
   at org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:125)
   at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
   at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
   at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99)
   at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
   at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
   at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
   at org.springframework.web.filter.HttpPutFormContentFilter.doFilterInternal(HttpPutFormContentFilter.java:108)
   at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
   at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
   at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
   at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:81)
   at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
   at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
   at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
   at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:197)
   at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
   at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
   at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
   at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:199)
   at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
   at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:478)
   at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)
   at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)
   at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
   at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342)
   at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:803)
   at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
   at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868)
   at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1459)
   at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
   at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
   at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
   at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
   at java.lang.Thread.run(Thread.java:748)
Caused by: org.apache.ibatis.exceptions.PersistenceException:
### Error querying database. Cause: java.lang.UnsupportedOperationException
### The error may exist in file [F:\idea\ros1.0\target\classes\mybatis\mapper\CourseMapper.xml]
### The error may involve com.ros.dao.CourseDao.getEnjoyCourseByUser
### The error occurred while handling results
### SQL: SELECT ros_course.id, ros_course.c_image AS image, ros_course.cname, ros_course.remark, ros_course.is_favorite AS isFavorite, ros_course.is_remark AS isRemark, ros_course.classify, ros_course.price, ros_course.visit, ros_course.update_time AS updateTime FROM ros_course WHERE id IN (   SELECT DISTINCT    course_id   FROM    user_course_chartor   WHERE    user_id = ? ) and c_type=? LIMIT ?
### Cause: java.lang.UnsupportedOperationException
   at org.apache.ibatis.exceptions.ExceptionFactory.wrapException(ExceptionFactory.java:30)
   at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:150)
   at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:141)
   at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
   at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
   at java.lang.reflect.Method.invoke(Method.java:498)
   at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:433)
   ... 80 more
Caused by: java.lang.UnsupportedOperationException
   at org.apache.ibatis.reflection.wrapper.CollectionWrapper.findProperty(CollectionWrapper.java:48)
   at org.apache.ibatis.reflection.MetaObject.findProperty(MetaObject.java:85)
   at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.createAutomaticMappings(DefaultResultSetHandler.java:488)
   at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.applyAutomaticMappings(DefaultResultSetHandler.java:512)
   at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.getRowValue(DefaultResultSetHandler.java:397)
   at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.handleRowValuesForSimpleResultMap(DefaultResultSetHandler.java:351)
   at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.handleRowValues(DefaultResultSetHandler.java:326)
   at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.handleResultSet(DefaultResultSetHandler.java:299)
   at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.handleResultSets(DefaultResultSetHandler.java:192)
   at org.apache.ibatis.executor.statement.PreparedStatementHandler.query(PreparedStatementHandler.java:64)
   at org.apache.ibatis.executor.statement.RoutingStatementHandler.query(RoutingStatementHandler.java:79)
   at org.apache.ibatis.executor.SimpleExecutor.doQuery(SimpleExecutor.java:63)
   at org.apache.ibatis.executor.BaseExecutor.queryFromDatabase(BaseExecutor.java:324)
   at org.apache.ibatis.executor.BaseExecutor.query(BaseExecutor.java:156)
   at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:109)
   at com.github.pagehelper.PageInterceptor.intercept(PageInterceptor.java:136)
   at org.apache.ibatis.plugin.Plugin.invoke(Plugin.java:61)
   at com.sun.proxy.$Proxy111.query(Unknown Source)
   at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:148)
   ... 86 more
经过排查可以发现是mybatis中的返回数据错误

在dao的函数定义如下：

在mapper中映射为

调整为：

ok，这个错误解决完成

Caused by: java.lang.UnsupportedOperationException

对Arrays.asList()返回的List进行操作之后报错Caused by: java.lang.UnsupportedOperationException

让我们来看一下Arrays.asList的源码:

/** * Returns a {@code List} of the objects in the specified array. The size of the * {@code List} cannot be modified, i.e. adding and removing are unsupported, but * the elements can be set. Setting an element modifies the underlying * array. * * @param array * the array. * @return a {@code List} of the elements of the specified array. */
    @SafeVarargs
    public static <T> List<T> asList(T... array) {
        return new ArrayList<T>(array);
    }

private static class ArrayList<E> extends AbstractList<E> implements
            List<E>, Serializable, RandomAccess {

        private static final long serialVersionUID = -2764017481108945198L;

        private final E[] a;

        ArrayList(E[] storage) {
            if (storage == null) {
                throw new NullPointerException("storage == null");
            }
            a = storage;
        }

        @Override
        public boolean contains(Object object) {
            if (object != null) {
                for (E element : a) {
                    if (object.equals(element)) {
                        return true;
                    }
                }
            } else {
                for (E element : a) {
                    if (element == null) {
                        return true;
                    }
                }
            }
            return false;
        }

        @Override
        public E get(int location) {
            try {
                return a[location];
            } catch (ArrayIndexOutOfBoundsException e) {
                throw java.util.ArrayList.throwIndexOutOfBoundsException(location, a.length);
            }
        }

        @Override
        public int indexOf(Object object) {
            if (object != null) {
                for (int i = 0; i < a.length; i++) {
                    if (object.equals(a[i])) {
                        return i;
                    }
                }
            } else {
                for (int i = 0; i < a.length; i++) {
                    if (a[i] == null) {
                        return i;
                    }
                }
            }
            return -1;
        }

        @Override
        public int lastIndexOf(Object object) {
            if (object != null) {
                for (int i = a.length - 1; i >= 0; i--) {
                    if (object.equals(a[i])) {
                        return i;
                    }
                }
            } else {
                for (int i = a.length - 1; i >= 0; i--) {
                    if (a[i] == null) {
                        return i;
                    }
                }
            }
            return -1;
        }

        @Override
        public E set(int location, E object) {
            E result = a[location];
            a[location] = object;
            return result;
        }

        @Override
        public int size() {
            return a.length;
        }

        @Override
        public Object[] toArray() {
            return a.clone();
        }

        @Override
        @SuppressWarnings({"unchecked", "SuspiciousSystemArraycopy"})
        public <T> T[] toArray(T[] contents) {
            int size = size();
            if (size > contents.length) {
                Class<?> ct = contents.getClass().getComponentType();
                contents = (T[]) Array.newInstance(ct, size);
            }
            System.arraycopy(a, 0, contents, 0, size);
            if (size < contents.length) {
                contents[size] = null;
            }
            return contents;
        }
    }

索噶，原来返回的是Arrays类的静态内部类！这样能会报错也就正常咯。

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