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Exception:spring boot+Restful AP

Exception:spring boot+Restful AP

作者: 黑小白少爷 | 来源:发表于2019-01-30 11:05 被阅读6次
    内容
    • 异常场景
    • 异常信息
    • 原因
    • 解决方案
    • 相关链接
    异常场景

    spring boot+Restful API

    在使用quarzt的时候,我想要在调用相关api接口时能够返回job的trigger信息

    于是我在自定义的job bean中加了如下代码

    @Transient
private Trigger trigger;

public void setTrigger(Trigger trigger) {
    this.trigger = trigger;
}

public Trigger getTrigger() {
    return this.trigger;
}

    当然,这里我是偷懒,直接用的Trigger类型(这个习惯并不好,因为我对Trigger的数据结构一开始并不熟悉)

    果然,我在调用相关接口的时候,出现了异常

    异常信息

    (https://github.com/prestodb/presto/issues/8457 与这个问题相同)

    com.fasterxml.jackson.databind.JsonMappingException: No serializer found for class org.quartz.JobBuilder and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationFeature.FAIL_ON_EMPTY_BEANS) (through reference chain: net.skycloud.nap.common.vo.PageInfo["list"]->java.util.ArrayList[0]->net.skycloud.nap.job.model.Job["jobDetailMessage"]->org.quartz.impl.JobDetailImpl["jobBuilder"])
    com.fasterxml.jackson.databind.JsonMappingException.from(JsonMappingException.java:284)
    com.fasterxml.jackson.databind.SerializerProvider.mappingException(SerializerProvider.java:1110)
    com.fasterxml.jackson.databind.SerializerProvider.reportMappingProblem(SerializerProvider.java:1135)
    com.fasterxml.jackson.databind.ser.impl.UnknownSerializer.failForEmpty(UnknownSerializer.java:69)
    com.fasterxml.jackson.databind.ser.impl.UnknownSerializer.serialize(UnknownSerializer.java:32)
    com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:704)
    com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:690)
    com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:155)
    com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:704)
    com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:690)
    com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:155)
    com.fasterxml.jackson.databind.ser.impl.IndexedListSerializer.serializeContents(IndexedListSerializer.java:119)
    com.fasterxml.jackson.databind.ser.impl.IndexedListSerializer.serialize(IndexedListSerializer.java:79)
    com.fasterxml.jackson.databind.ser.impl.IndexedListSerializer.serialize(IndexedListSerializer.java:18)
    com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:704)
    com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:690)
    com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:155)
    com.fasterxml.jackson.databind.ser.DefaultSerializerProvider.serializeValue(DefaultSerializerProvider.java:292)
    com.fasterxml.jackson.databind.ObjectWriter$Prefetch.serialize(ObjectWriter.java:1429)
    com.fasterxml.jackson.databind.ObjectWriter.writeValue(ObjectWriter.java:951)
    org.springframework.http.converter.json.AbstractJackson2HttpMessageConverter.writeInternal(AbstractJackson2HttpMessageConverter.java:279)
    org.springframework.http.converter.AbstractGenericHttpMessageConverter.write(AbstractGenericHttpMessageConverter.java:106)
    org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodProcessor.writeWithMessageConverters(AbstractMessageConverterMethodProcessor.java:231)
    org.springframework.web.servlet.mvc.method.annotation.RequestResponseBodyMethodProcessor.handleReturnValue(RequestResponseBodyMethodProcessor.java:174)
    org.springframework.web.method.support.HandlerMethodReturnValueHandlerComposite.handleReturnValue(HandlerMethodReturnValueHandlerComposite.java:81)
    org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:113)
    org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:827)
    org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:738)
    org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85)
    org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:963)
    org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:897)
    org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970)
    org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:861)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:635)
    org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
    org.springframework.boot.web.filter.ApplicationContextHeaderFilter.doFilterInternal(ApplicationContextHeaderFilter.java:55)
    org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:101)
    net.skycloud.nap.auth.security.AuthFilter.doFilterInternal(AuthFilter.java:109)
    org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    org.springframework.boot.actuate.trace.WebRequestTraceFilter.doFilterInternal(WebRequestTraceFilter.java:110)
    org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:317)
    org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:127)
    org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:91)
    org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
    org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:114)
    org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
    org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:137)
    org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
    org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:111)
    org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
    org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:170)
    org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
    org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:63)
    org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
    net.skycloud.nap.auth.security.AuthFilter.doFilterInternal(AuthFilter.java:109)
    org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
    org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:116)
    org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
    org.springframework.security.web.header.HeaderWriterFilter.doFilterInternal(HeaderWriterFilter.java:64)
    org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
    org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:105)
    org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
    org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:56)
    org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
    org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:214)
    org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:177)
    org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:346)
    org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:262)
    org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99)
    org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    org.springframework.web.filter.HttpPutFormContentFilter.doFilterInternal(HttpPutFormContentFilter.java:105)
    org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:81)
    org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:197)
    org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    org.springframework.boot.actuate.autoconfigure.MetricsFilter.doFilterInternal(MetricsFilter.java:106)
    org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    原因

    首先让我们看一下spring boot创建restful 风格的api时他是怎么做的

    • 通过controller 方法返回的值类型找到相应的bean
    • 通过bean中的get方法获得json格式的数据,这就是接口返回的http reponse body
    • ....

    也就是说框架在返回http reponse的时候需要将接口对应的方法返回值转成json格式

    而出现上面异常信息的原因就是框架无法直接将Trigger对象转成相应的json格式

    解决方案

    解决方案有三种

    • 一.在定义一个bean,专门用来存放trigger的信息,并且这个bean可以被框架转成json格式

      class TriggerBean{
    //自己对Trigger信息提取封装
}

@Transient
private TriggerBean triggerBean;

public void setTriggerBean(TriggerBean triggerBean) {
    this.triggerBean = triggerBean;
}

public TriggerBean getTriggerBean() {
    return this.triggerBean;
}

    • 二.直接定义triggerInfo属性类型,在set的时候将trigger中的信息提取出,当然,我这里的List<Map<String,Object>>类型只是因为需求,不同需求就会有不同类型

      @Transient
private List<Map<String,Object>> triggerInfo;

public List<Map<String,Object>> setTriggerInfo(TriggerInfo triggerInfo) {
    this.triggerInfo = triggerInfo;
}

public List<Map<String,Object>> getTriggerInfo() {
    return this.triggerInfo;
}

    • 三.如果此时我想在这个job类中有这个Trigger属性,又想在接口返回其有用信息怎么办呢

      在异常原因可以看见框架是通过bean的get方法转化成相应的json,在这里我们可以通过@JsonIgnore注解使得框架不返回getTrigger方法对应的属性,再使用@JsonProperty("trigger")注解,这样框架就会将getTriggerInfo方法对应的属性转化成json中trigger字段对应的数据(关于这两个注解可以了解一下)

      @Transient
private Trigger trigger;
public void setTrigger(Trigger trigger) {
    this.trigger = trigger;
}
@JsonIgnore
public Trigger getTrigger() {
    return this.trigger;
}

@Transient
private List<Map<String,Object>> triggerInfo;
public List<Map<String,Object>> setTriggerInfo(TriggerInfo triggerInfo) {
    this.triggerInfo = triggerInfo;
}
@JsonProperty("trigger")
public List<Map<String,Object>> getTriggerInfo() {
    return this.triggerInfo;
}
      相关链接

      https://github.com/prestodb/presto/issues/8457

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