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  • Jackson报错

    2015-05-19 22:36:22
    报错信息: ContainerSerializers$AsArraySerializer.serialize(ContainerSerializers.java:130) 原因是Json的那个对象存在一对多的字段。。造成递归。。 解决方法,忽略字段 在那个字段get方法前加注解 ...

    报错信息:

    ContainerSerializers$AsArraySerializer.serialize(ContainerSerializers.java:130)


    原因是Json的那个对象存在一对多的字段。。造成递归。。

    解决方法,忽略字段

    在那个字段get方法前加注解

    @JsonIgnore  
        public Task getTask() {
            return task;
        }



    展开全文
  • Jackson报错org.codehaus.jackson.map.JsonMappingException /* Markdown.css */ /* Authors: Kevin Burke: http://kev.inburke.com/, modified by Evan Wondrasek */ /* https://bitbucket.org/kevinburke/ma

      在使用Spring MVC + Jackson-1.9.12时报的一个异常,本文暂时也只是描述一下如何绕开这个异常,并简单说明一下出错原因。希望如果有大神碰巧看过这个问题,不吝赐教。

    异常详细描述

    主要是Jackson的异常:

    org.springframework.http.converter.HttpMessageNotWritableException: Could not write JSON: No serializer found for class org.springframework.validation.DefaultMessageCodesResolver and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationConfig.Feature.FAIL_ON_EMPTY_BEANS) ) (through reference chain: org.springframework.validation.support.BindingAwareModelMap["org.springframework.validation.BindingResult.GStation"]->org.springframework.validation.BeanPropertyBindingResult["messageCodesResolver"]); nested exception is org.codehaus.jackson.map.JsonMappingException: No serializer found for class org.springframework.validation.DefaultMessageCodesResolver and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationConfig.Feature.FAIL_ON_EMPTY_BEANS) ) (through reference chain: org.springframework.validation.support.BindingAwareModelMap["org.springframework.validation.BindingResult.GStation"]->org.springframework.validation.BeanPropertyBindingResult["messageCodesResolver"])
    	org.springframework.http.converter.json.MappingJacksonHttpMessageConverter.writeInternal(MappingJacksonHttpMessageConverter.java:194)
    	org.springframework.http.converter.AbstractHttpMessageConverter.write(AbstractHttpMessageConverter.java:179)
    	org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter$ServletHandlerMethodInvoker.writeWithMessageConverters(AnnotationMethodHandlerAdapter.java:1037)
    	org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter$ServletHandlerMethodInvoker.handleResponseBody(AnnotationMethodHandlerAdapter.java:995)
    	org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter$ServletHandlerMethodInvoker.getModelAndView(AnnotationMethodHandlerAdapter.java:944)
    	org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:441)
    	org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:428)
    	org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:925)
    	org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:856)
    	org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:936)
    	org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:838)
    	javax.servlet.http.HttpServlet.service(HttpServlet.java:710)
    	org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:812)
    	javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
    	org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
    	org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    

    因为使用Spring MVC框架控制器处理请求,所以同时会报Spring的异常:

    org.codehaus.jackson.map.JsonMappingException: No serializer found for class org.springframework.validation.DefaultMessageCodesResolver and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationConfig.Feature.FAIL_ON_EMPTY_BEANS) ) (through reference chain: org.springframework.validation.support.BindingAwareModelMap["org.springframework.validation.BindingResult.GStation"]->org.springframework.validation.BeanPropertyBindingResult["messageCodesResolver"])
    	org.codehaus.jackson.map.ser.impl.UnknownSerializer.failForEmpty(UnknownSerializer.java:52)
    	org.codehaus.jackson.map.ser.impl.UnknownSerializer.serialize(UnknownSerializer.java:25)
    	org.codehaus.jackson.map.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:446)
    	org.codehaus.jackson.map.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:150)
    	org.codehaus.jackson.map.ser.BeanSerializer.serialize(BeanSerializer.java:112)
    	org.codehaus.jackson.map.ser.std.MapSerializer.serializeFields(MapSerializer.java:262)
    	org.codehaus.jackson.map.ser.std.MapSerializer.serialize(MapSerializer.java:186)
    	org.codehaus.jackson.map.ser.std.MapSerializer.serialize(MapSerializer.java:23)
    	org.codehaus.jackson.map.ser.StdSerializerProvider._serializeValue(StdSerializerProvider.java:610)
    	org.codehaus.jackson.map.ser.StdSerializerProvider.serializeValue(StdSerializerProvider.java:256)
    	org.codehaus.jackson.map.ObjectMapper.writeValue(ObjectMapper.java:1613)
    	org.springframework.http.converter.json.MappingJacksonHttpMessageConverter.writeInternal(MappingJacksonHttpMessageConverter.java:191)
    	org.springframework.http.converter.AbstractHttpMessageConverter.write(AbstractHttpMessageConverter.java:179)
    	org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter$ServletHandlerMethodInvoker.writeWithMessageConverters(AnnotationMethodHandlerAdapter.java:1037)
    	org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter$ServletHandlerMethodInvoker.handleResponseBody(AnnotationMethodHandlerAdapter.java:995)
    	org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter$ServletHandlerMethodInvoker.getModelAndView(AnnotationMethodHandlerAdapter.java:944)
    	org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:441)
    	org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:428)
    	org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:925)
    	org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:856)
    	org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:936)
    	org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:838)
    	javax.servlet.http.HttpServlet.service(HttpServlet.java:710)
    	org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:812)
    	javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
    	org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
    	org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    

    代码

      前台代码使用jQuery的ajax异步调用,代码中利用Spring MVC可以直接将data数据赋值到pojo对象属性中。

    $.ajax({
        type : "post",
        url : "/businesssite/updStation",
        data : station,
        dataType : "json",
        success : function(data) {
            if(data && data.msg == "s") {
                alert("成功");
            } else {
                alert("失败");
            }
        },
        error : function(e) {
            alert("错误:" + e.responseText);
        }
    });
    

      后台代码Spring MVC的注解定义控制器请求路径及参数,station为需要获取ajax参数的对象,map为需要返回的对象(此处的map默认情况下会是Spring定义的BindingAwareModelMap的实例,Map、Model、ModelMap都是一样的。但由于Model接口没有clear方法,会影响其中一种处理bug的方法,下面会讲到。)

    @RequestMapping(value = "/updStation", method = POST)
    @ResponseBody
    public Map<String, Object> updStation(GStation station, Map<String, Object> map) {
        try {
            log.debug(station);
            map.put("msg", "s");
        } catch (Exception e) {
            log.error(e.getMessage(), e);
            map.put("msg", "e");
        }
        return map;
    }
    

    此时就会报出本文开头提到的异常。

    现象

      通过打断点,查看进入控制器的方法中各个对象实例的状态,发现正常程序与异常程序之间的区别:

    1. 把自定义类换成Java自带的封装类都能够正确运行;
    2. 当程序正常运行时,map是空的(不是null)。而异常程序的map包含两个值,一个是GStation对象的值,一个是org.springframework.validation.BindingResult.GStation=org.springframework.validation.BeanPropertyBindingResult: 0 errors。

      有图为证:

             1. 出现异常的代码中map或model的值

             2. 未出现异常的代码中map或model的值


      因此做出大胆假设,出错的原因是ajax传递多值至对象中时,Spring MVC会在map里面增加两个值(一个是传输的数据对象,一个是对于对象属性绑定的验证结果),而这两个值是Jackson将map处理成json格式时出错 。通过Spring文档中的内容也验证了这一说法,内容如下:

    Command or form objects to bind request parameters to bean properties (via setters) or directly to fields, with customizable type conversion, depending on@InitBinder methods and/or the HandlerAdapter configuration. See thewebBindingInitializer property on RequestMappingHandlerAdapter. Such command objects along with their validation results will be exposed as model attributes by default, using the command class class name - e.g. model attribute "orderAddress" for a command object of type "some.package.OrderAddress". The ModelAttribute annotation can be used on a method argument to customize the model attribute name used.

    所以,只要map是空的(非null)就行了。

    解决办法

      既然找到了解决思路,那方法就有多种了:

    1. 通过map.clear()方法将map清空(此方法适用于Map及MedalMap);

      @RequestMapping(value = "/updStation", method = POST)
      @ResponseBody
      public Map<String, Object> updStation(GStation station, Map<String, Object> map) {
          map.clear();
          try {
              log.debug(station);
              map.put("msg", "s");
          } catch (Exception e) {
              log.error(e.getMessage(), e);
              map.put("msg", "e");
          }
          return map;
      }
      
    2. 不需要Spring帮忙创建map,自己new一个。

      @RequestMapping(value = "/updStation", method = POST)
      @ResponseBody
      public Map<String, Object> updStation(GStation station) {
          Map<String, Object> map = new HashMap<String, Object>();
          try {
              log.debug(station);
              map.put("msg", "s");
          } catch (Exception e) {
              log.error(e.getMessage(), e);
              map.put("msg", "e");
          }
          return map;
      }
      

    注:Spring MVC帮助定义的对象是BindingAwareModelMap,通过源码或API可以知道,这个类是LinkedHashMap的子类,也算是HashMap的子类,所以这的地方创建HashMap对象不算错。

    后语

      这个异常开始的时候感觉是Jackson的异常,但是起因似乎还是Spring MVC。在Map中多出的数据是Spring MVC对于向对象中赋值时增加的校验信息,当这些校验信息提交给Jackson时,Jackson无法将其转换成json数据,所以报出异常。

      如果有大神路过,跪求指正。

    展开全文
  • 有关Jackson报错总结

    2020-12-21 14:18:13
    报错原因:在springmvc中默认没有引入Jackson,需要在pom.xml中手动导入 解决办法:在pom.xml中手动导入相关的依赖 <dependency> <groupId>com.fasterxml.jackson.core</groupId> <a.
    错误:No converter found for return value of type: class java.util.ArrayList
    

    报错原因:在springmvc中默认没有引入Jackson,需要在pom.xml中手动导入

    解决办法:在pom.xml中手动导入相关的依赖

    <dependency>
                <groupId>com.fasterxml.jackson.core</groupId>
                <artifactId>jackson-core</artifactId>
                <version>2.11.0</version>
    </dependency>
    <dependency>
                <groupId>com.fasterxml.jackson.core</groupId>
                <artifactId>jackson-databind</artifactId>
                <version>2.11.0</version>
    </dependency>
    <dependency>
                <groupId>com.fasterxml.jackson.core</groupId>
                <artifactId>jackson-annotations</artifactId>
                <version>2.11.0</version>
    </dependency>

     

     

     

     


    使用Jackson时遇到此错误,可能时springmvc的版本与Jackson的版本冲突导致的

    java.lang.NoClassDefFoundError: com/fasterxml/jackson/databind/exc/InvalidDefinitionException

    解决方法:在pom.xml中引入版本更高或者更低的Jackson,引入完成后要记得在文件结构中的lib重新导入相应的jar包

     

     


    错误:java.lang.NoSuchMethodError: com.fasterxml.jackson.core.JsonGenerator.writeStartArray(Ljava/lang/Object;I)V

    报错原因:jackson的版本相差过大

    解决办法:把将各个版本同一即可

     

     

    展开全文
  • studio引入jackson报错

    2017-10-25 19:09:24
    jackson 添加忽略 app:transformResourcesWithMergeJavaResForDebu

    最近,需要在项目中引用jackson开发库,为什么要引入这个库,不能使用Gson吗?可以使用Gson,但是为了使用jackson的忽略实体类字段的功能,而我不知道Gson该如何设置忽略,这是前提。

    需要引入的jackson文件:

    这里写图片描述

    运行时报错:

    Error:Execution failed for task ‘:app:transformResourcesWithMergeJavaResForDebug’.
    com.android.build.api.transform.TransformException: com.android.builder.packaging.DuplicateFileException: Duplicate files copied in APK META-INF/LICENSE
    File1: D:\work\studiopro\SevenCalendar\app\libs\jackson-annotations-2.7.5.jar
    File2: D:\work\studiopro\SevenCalendar\app\libs\jackson-core-2.7.5.jar
    File3: D:\work\studiopro\SevenCalendar\app\libs\jackson-databind-2.7.5.jar

    截图如下:

    这里写图片描述

    报错看来是因为三个jar中包含了同样的LICENSE.txt文件,这样打包的时候有可能会相互覆盖,studio检测到这种情况,就抛出错误。

    解决办法:

    在app的build.gradle中增加配置:

    packagingOptions {
    exclude ‘META-INF/LICENSE’
    exclude ‘META-INF/NOTICE’
    }

    添加配置之后的build.gradle:

    apply plugin: 'com.android.application'
    
    android {
        compileSdkVersion 25
        buildToolsVersion "26.0.1"
        defaultConfig {
            applicationId "com.seven.sevencalendar"
            minSdkVersion 15
            targetSdkVersion 25
            versionCode 1
            versionName "1.0"
            testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
        }
        buildTypes {
            release {
                minifyEnabled false
                proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
            }
        }
    
        packagingOptions {
            exclude 'META-INF/LICENSE'
            exclude 'META-INF/NOTICE'
        }
    }
    
    dependencies {
        compile fileTree(include: ['*.jar'], dir: 'libs')
        androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
            exclude group: 'com.android.support', module: 'support-annotations'
        })
        compile 'com.android.support:appcompat-v7:25.3.1'
        compile 'com.android.support.constraint:constraint-layout:1.0.2'
        testCompile 'junit:junit:4.12'
        compile 'com.google.code.gson:gson:2.3.1'
        compile project(':calendar')
        compile files('libs/jackson-core-2.7.5.jar')
        compile files('libs/jackson-annotations-2.7.5.jar')
        compile files('libs/jackson-databind-2.7.5.jar')
        compile 'com.nineoldandroids:library:2.4.0'
        compile 'com.zhy:okhttputils:2.6.2'
    }
    

    ok,报错问题到此解决。

    备注:

    为什么要设置忽略呢?答案是为了避免后台返回的字段跟前端定义的不一致(有可能是后台添加或者减少字段而没有通知前端),而导致前端解析数据抛出异常的情况。

    使用jackson设置忽略很简单,一行代码足矣。

    package com.seven.sevencalendar.bean;
    
    import java.io.Serializable;
    
    import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
    
    //就是下面这一行代码**************
    @JsonIgnoreProperties(ignoreUnknown = true)
    public class TimeSchedule implements Serializable {
        private static final long serialVersionUID = 1L;
    
        //2017.10.11新增字段
        String threeState;
    
        String overdueDay;
    
        public String getThreeState() {
            return threeState;
        }
    
        public void setThreeState(String threeState) {
            this.threeState = threeState;
        }
    
        public String getOverdueDay() {
            return overdueDay;
        }
    
        public void setOverdueDay(String overdueDay) {
            this.overdueDay = overdueDay;
        }
    
        /**
         * 待办事项ID
         */
        String _id;
        /**
         * 经销商代码
         */
        String delearCode;
        /**
         * 销售顾问代码
         */
        String scCode;
        /**
         * 待办分类 ( '店内事务','完善资料','联系客户','预约接待','外出')
         */
        String scheduleHead;
        /**
         * 待办子类(因公外出 因私外出 店内市场活动 推送预约到店 自建线索预约 交车 未到店邀约 已到店跟进)
         */
        String scheduleSub;
        /**
         * 待办小类 (休假 外展 外拓 其他)
         */
        String scheduleSmall;
        /**
         * 开始时间(2016/08/16 06:55:34)
         */
        String startTime;
        /**
         * 结束时间
         */
        String endTime;
        /**
         * 内容
         */
        String content;
        /**
         * 备注
         */
        String remark;
        /**
         * 属性类型(活动 顾客 线索)
         */
        String attrType;
        /**
         * 属性id
         */
        String attrNum;
        /**
         * 更新人
         */
        String user;
    
    
        /**
         * 顾客性别
         */
        String custSex;
        /**
         * 顾客姓名
         */
        String custName;
        /**
         * 上次进店日期
         */
        String custLastInroomDate;
        /**
         * 顾客级别
         * 
         */
        String custLevel;
        /**
         * 顾客意向车型
         */
        String custCar;
        /**
         * 顾客状态
         */
        String custState;
        /**
         * 顾客联系电话
         */
        String custPhone;
    
    
        public TimeSchedule() {
            super();
        }
    
        public TimeSchedule(String delearCode, String scCode, String scheduleHead,
                String scheduleSub, String scheduleSmall, String startTime,
                String endTime, String content, String remark, String attrType,
                String attrNum, String user) {
            super();
            this.delearCode = delearCode;
            this.scCode = scCode;
            this.scheduleHead = scheduleHead;
            this.scheduleSub = scheduleSub;
            this.scheduleSmall = scheduleSmall;
            this.startTime = startTime;
            this.endTime = endTime;
            this.content = content;
            this.remark = remark;
            this.attrType = attrType;
            this.attrNum = attrNum;
            this.user = user;
        }
    
        /**
         * 获取日历时使用
         */
        public TimeSchedule(String id, String delearCode, String scCode,
                String scheduleHead, String scheduleSub, String scheduleSmall,
                String startTime, String endTime, String content, String remark,
                String attrType, String attrNum, String user) {
            super();
            this._id = id;
            this.delearCode = delearCode;
            this.scCode = scCode;
            this.scheduleHead = scheduleHead;
            this.scheduleSub = scheduleSub;
            this.scheduleSmall = scheduleSmall;
            this.startTime = startTime;
            this.endTime = endTime;
            this.content = content;
            this.remark = remark;
            this.attrType = attrType;
            this.attrNum = attrNum;
            this.user = user;
        }
        public String getCustName() {
            return custName;
        }
    
        public void setCustName(String custName) {
            this.custName = custName;
        }
    
    
        public String getCustSex() {
            return custSex;
        }
    
        public void setCustSex(String custSex) {
            this.custSex = custSex;
        }
    
        public String getCustLastInroomDate() {
            return custLastInroomDate;
        }
    
        public void setCustLastInroomDate(String custLastInroomDate) {
            this.custLastInroomDate = custLastInroomDate;
        }
    
        public String getCustLevel() {
            return custLevel;
        }
    
        public void setCustLevel(String custLevel) {
            this.custLevel = custLevel;
        }
    
        public String getCustCar() {
            return custCar;
        }
    
        public void setCustCar(String custCar) {
            this.custCar = custCar;
        }
    
        public String getCustState() {
            return custState;
        }
    
        public void setCustState(String custState) {
            this.custState = custState;
        }
    
        public String getId() {
            return _id;
        }
    
        public void setId(String id) {
            this._id = id;
        }
    
        public String getDelearCode() {
            return delearCode;
        }
    
        public void setDelearCode(String delearCode) {
            this.delearCode = delearCode;
        }
    
        public String getScCode() {
            return scCode;
        }
    
        public void setScCode(String scCode) {
            this.scCode = scCode;
        }
    
        public String getScheduleHead() {
            return scheduleHead;
        }
    
        public void setScheduleHead(String scheduleHead) {
            this.scheduleHead = scheduleHead;
        }
    
        public String getScheduleSub() {
            return scheduleSub;
        }
    
        public void setScheduleSub(String scheduleSub) {
            this.scheduleSub = scheduleSub;
        }
    
        public String getScheduleSmall() {
            return scheduleSmall;
        }
    
        public void setScheduleSmall(String scheduleSmall) {
            this.scheduleSmall = scheduleSmall;
        }
    
        public String getStartTime() {
            return startTime;
        }
    
        public void setStartTime(String startTime) {
            this.startTime = startTime;
        }
    
        public String getEndTime() {
            return endTime;
        }
    
        public void setEndTime(String endTime) {
            this.endTime = endTime;
        }
    
        public String getContent() {
            return content;
        }
    
        public void setContent(String content) {
            this.content = content;
        }
    
        public String getRemark() {
            return remark;
        }
    
        public void setRemark(String remark) {
            this.remark = remark;
        }
    
        public String getAttrType() {
            return attrType;
        }
    
        public void setAttrType(String attrType) {
            this.attrType = attrType;
        }
    
        public String getAttrNum() {
            return attrNum;
        }
    
        public void setAttrNum(String attrNum) {
            this.attrNum = attrNum;
        }
    
        public String getUser() {
            return user;
        }
    
        public void setUser(String user) {
            this.user = user;
        }
    
        public String getCustPhone() {
            return custPhone;
        }
    
        public void setCustPhone(String custPhone) {
            this.custPhone = custPhone;
        }
    
        @Override
        public String toString() {
            return String
                    .format("TimeSchedule [id=%s, delearCode=%s, scCode=%s, scheduleHead=%s, scheduleSub=%s, scheduleSmall=%s, startTime=%s, endTime=%s, content=%s, remark=%s, attrType=%s, attrNum=%s, user=%s, custSex=%s, custName=%s, custLastInroomDate=%s, custLevel=%s, custCar=%s, custState=%s, custPhone=%s]",
                            _id, delearCode, scCode, scheduleHead, scheduleSub,
                            scheduleSmall, startTime, endTime, content, remark,
                            attrType, attrNum, user, custSex, custName,
                            custLastInroomDate, custLevel, custCar, custState,
                            custPhone);
        }
    
    }
    展开全文
  • 最近用spring4.x整合Jackson,结果莫名其妙的一直报错,网上收索的结果都是在maven或者gradle的环境下配置依赖条件解决的;但是eclipseIDE环境下的jar包应该是会自动依赖影射的。结果一直也没找到可以解决的答案。 ...
  • java.lang.NoSuchMethodError: com.fasterxml.jackson.databind.JavaType.isReferenceType()Z 出现这个错误的就是你的jackson在maven中的配置出了问题。
  • 在使用SpringMVC和jackson时,如果报错No converter found for return value of type 解决方案: 检查有没有jackson-core,jackson-annotations,jackson-databind这三个包 检查SpringMVC与Jackson的兼容问题:...
  • 解决 Jackson 报错:can not access a member of class com.fasterxml.jackson.databind.ser.std.NullSerializer with modifiers "private"   一、问题描述 1、在使用 ssm 框架,返回 json 数据时候,...
  • 背景:java -jar启动报错,但是本地idea运行正常。 环境: jdk1.8 jackson: <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-core</artifactId&...
  • spring4配置jackson报错解决

    千次阅读 2016-03-20 15:26:28
    对于spring4当中,jackson配置调用的方法变为了MappingJackson2JsonView,若出现对应问题需要更改。如下 class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter"
  • 采用2.6的jar包即可解决,自行到maven仓库下载。 链接地址:
  • java.lang.NoSuchMethodError:com.fasterxml.jackson.core.JsonParser.getReadCapabilities() redisTemplate.opsForValue().set(“name”,“lisa”);执行没有问题 redisTemplate.opsForValue().get(“name
  • java.lang.ClassNotFoundException: com.fasterxml.jackson.databind.exc.InvalidDefinitionEx
  • 版本兼容问题 ...jackson版本为2.6.7 将jackson版本改为2.10.0即可 <!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-databind --> <dependency> <groupId>...
  • 一、错误信息 这里两个实体类:Dep(部门) 和 emps(员工) 是一对多双向关联 刚开始在Dep.java中...尽然还是报错。 第二次报错: No serializer found for class org.hibernate.proxy.pojo.javassist.Java
  • nested exception is java.lang.NoClassDefFoundError: com/fasterxml/jackson/databind/exc/InvalidDefinitionException 2017-12-31 13:23:06,385 ERROR [org.springframework.web.servlet.DispatcherServlet] - ...
  • 出现这种问题有两种原因, 就是jackson的版本和spring的版本 spring4.x的好像要求jackson也要2.x以上, 而spring5.x的对有的jackson2.9.x的也没有用, 得降低spring的版本...
  • 如果你的spring使用的是4.0以上的,jackson使用的是2.7以上的,那么就会报错。 解决办法:  &lt;properties&gt;  &lt;!-- spring版本号 --&gt;  &lt;spring.version&gt;4.3.16....
  • spring3MVC中@ResponseBody一个对象,但是会报:Infinite recursion (StackOverflowError)的问题. 原因是对象有关联关系造成无限循环. 解决办法之一: 在返回对象的entity中找到有关联关系的对象,在其get方法上...

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