1. object is not an instance of declaring class

错误日日志

 2016-06-01 10:55:59,612 [RMI TCP Connection(127.0.0.1:2181)] DEBUG org.apache.zookeeper.ClientCnxn - Got ping response for sessionid: 0x154ff32b10a0058 after 0ms
[01/06/16 10:56:05:005 CST] http-nio-8090-exec-6 DEBUG core.SynchronousDispatcher: PathInfo: /tianji/items/pulloffshelf
2016-06-01 10:56:05,589 [http-nio-8090-exec-6] WARN  cn.company.test.exceptions.RestExceptionMapper - [runtime exception] : %s
2016-06-01 10:56:05,589 [http-nio-8090-exec-6] DEBUG cn.company.test.exceptions.RestExceptionMapper - [runtime exception] :
org.jboss.resteasy.spi.InternalServerErrorException: Bad arguments passed to org.jboss.resteasy.spi.metadata.ResourceMethod@6b9e0ff4  ( cn.company.goods.pojos.PullOffShelves cn.company.goods.pojos.PullOffShelves@2e1cb83d )
    at org.jboss.resteasy.core.MethodInjectorImpl.invoke(MethodInjectorImpl.java:177) ~[resteasy-jaxrs-3.0.7.Final.jar:?]
    at org.jboss.resteasy.core.ResourceMethodInvoker.invokeOnTarget(ResourceMethodInvoker.java:288) ~[resteasy-jaxrs-3.0.7.Final.jar:?]
    at org.jboss.resteasy.core.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:242) ~[resteasy-jaxrs-3.0.7.Final.jar:?]
    at org.jboss.resteasy.core.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:229) ~[resteasy-jaxrs-3.0.7.Final.jar:?]
    at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:356) [resteasy-jaxrs-3.0.7.Final.jar:?]
    at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:179) [resteasy-jaxrs-3.0.7.Final.jar:?]
    at org.jboss.resteasy.plugins.server.servlet.ServletContainerDispatcher.service(ServletContainerDispatcher.java:220) [resteasy-jaxrs-3.0.7.Final.jar:?]
    at org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:56) [resteasy-jaxrs-3.0.7.Final.jar:?]
    at org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:51) [resteasy-jaxrs-3.0.7.Final.jar:?]
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:729) [servlet-api.jar:?]
    at com.alibaba.dubbo.rpc.protocol.rest.DubboHttpServer$RestHandler.handle(DubboHttpServer.java:86) [dubbo-2.8.4.jar:2.8.4]
    at com.alibaba.dubbo.remoting.http.servlet.DispatcherServlet.service(DispatcherServlet.java:64) [dubbo-2.8.4.jar:2.8.4]
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:729) [servlet-api.jar:?]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:292) [catalina.jar:8.0.35]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207) [catalina.jar:8.0.35]
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) [tomcat-websocket.jar:8.0.35]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240) [catalina.jar:8.0.35]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207) [catalina.jar:8.0.35]
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:212) [catalina.jar:8.0.35]
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106) [catalina.jar:8.0.35]
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502) [catalina.jar:8.0.35]
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:141) [catalina.jar:8.0.35]
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79) [catalina.jar:8.0.35]
    at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:616) [catalina.jar:8.0.35]
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88) [catalina.jar:8.0.35]
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:528) [catalina.jar:8.0.35]
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1099) [tomcat-coyote.jar:8.0.35]
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:672) [tomcat-coyote.jar:8.0.35]
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1520) [tomcat-coyote.jar:8.0.35]
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1476) [tomcat-coyote.jar:8.0.35]
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [?:1.8.0_91]
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [?:1.8.0_91]
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-util.jar:8.0.35]
    at java.lang.Thread.run(Thread.java:745) [?:1.8.0_91]
Caused by: java.lang.IllegalArgumentException: object is not an instance of declaring class
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_91]
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_91]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_91]
    at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_91]
    at org.jboss.resteasy.core.MethodInjectorImpl.invoke(MethodInjectorImpl.java:137) ~[resteasy-jaxrs-3.0.7.Final.jar:?]
    ... 33 more
2016-06-01 10:56:12,950 [RMI TCP Connection(127.0.0.1:2181)] DEBUG org.apache.zookeeper.ClientCnxn - Got ping response for sessionid: 0x154ff32b10a0058 after 0ms

通篇错误最明显的两个地方：

org.jboss.resteasy.spi.InternalServerErrorException: Bad arguments passed to org.jboss.resteasy.spi.metadata.ResourceMethod@6b9e0ff4 ( cn.company.goods.pojos.PullOffShelves cn.company.goods.pojos.PullOffShelves@2e1cb83d和Caused by: java.lang.IllegalArgumentException: object is not an instance of declaring class。

错误原因

在dubbox的service（itemServiceImpl）中实现了两个接口（itemervice,itemPullOffShelfService）,dubbox暴露给zk的服务（dubbo:service）有两个，但是实现的bean有一个（ref），zk虽然注册了服务，但是rest（暂且当作消费方）调用接口的时候，不知道调用的是哪一个资源接口。

如果是其它方式引发的错误，此处的解决方法不可用。

解决方法

将两个接口合并到同一个接口或者分别实现两个接口。问题即可解决。

2. Could not find message body reader for type

错误日志

[02/06/16 04:34:38:038 CST] http-nio-8080-exec-5  INFO support.LoggingFilter:  [DUBBO] The contents of request body is: 

, dubbo version: 2.8.4, current host: 127.0.0.1
[02/06/16 04:34:38:038 CST] http-nio-8080-exec-5  WARN core.ExceptionHandler: failed to execute
javax.ws.rs.NotSupportedException: Could not find message body reader for type: class cn.company.common.query.BaseSearch of content type: */*
    at org.jboss.resteasy.core.interception.ServerReaderInterceptorContext.throwReaderNotFound(ServerReaderInterceptorContext.java:52)
    at org.jboss.resteasy.core.interception.AbstractReaderInterceptorContext.getReader(AbstractReaderInterceptorContext.java:73)
    at org.jboss.resteasy.core.interception.AbstractReaderInterceptorContext.proceed(AbstractReaderInterceptorContext.java:50)
    at com.alibaba.dubbo.rpc.protocol.rest.support.LoggingFilter.aroundReadFrom(LoggingFilter.java:75)
    at org.jboss.resteasy.core.interception.AbstractReaderInterceptorContext.proceed(AbstractReaderInterceptorContext.java:53)
    at org.jboss.resteasy.plugins.interceptors.encoding.GZIPDecodingInterceptor.aroundReadFrom(GZIPDecodingInterceptor.java:59)
    at org.jboss.resteasy.core.interception.AbstractReaderInterceptorContext.proceed(AbstractReaderInterceptorContext.java:53)
    at org.jboss.resteasy.core.MessageBodyParameterInjector.inject(MessageBodyParameterInjector.java:150)
    at org.jboss.resteasy.core.MethodInjectorImpl.injectArguments(MethodInjectorImpl.java:89)
    at org.jboss.resteasy.core.MethodInjectorImpl.invoke(MethodInjectorImpl.java:112)
    at org.jboss.resteasy.core.ResourceMethodInvoker.invokeOnTarget(ResourceMethodInvoker.java:288)
    at org.jboss.resteasy.core.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:242)
    at org.jboss.resteasy.core.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:229)
    at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:356)
    at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:179)
    at org.jboss.resteasy.plugins.server.servlet.ServletContainerDispatcher.service(ServletContainerDispatcher.java:220)
    at org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:56)
    at org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:51)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
    at com.alibaba.dubbo.rpc.protocol.rest.DubboHttpServer$RestHandler.handle(DubboHttpServer.java:86)
    at com.alibaba.dubbo.remoting.http.servlet.DispatcherServlet.service(DispatcherServlet.java:64)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:292)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:212)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:141)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
    at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:616)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:528)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1099)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:672)
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1520)
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1476)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    at java.lang.Thread.run(Thread.java:745)
[02/06/16 04:34:38:038 CST] http-nio-8080-exec-5  INFO support.LoggingFilter:  [DUBBO] The HTTP headers are: 
, dubbo version: 2.8.4, current host: 127.0.0.1

错误原因

这是由于在接口实现中没有添加相应的注解：@QueryParam,@BeanParam,@Component,@Consumes,@Produces等注解。最与该错误重要便是前两个。

我的错误指出来了，是不能找到消息体类型，这说明传入的参数出错，或者接口获取参数出错。仔细检查发现，在接口中将request参数转化为一个对象，但没有指出该对象就是@BeanParam.

错误代码：

@Component("loginRegisterService")
@Path("statistics")
@Produces({ContentType.APPLICATION_JSON_UTF_8})
public class LoginRegisterServiceImpl implements LoginRegisterService {
    Log logger = LogFactory.getLog(LoginRegisterServiceImpl.class);

    @Resource
    private LoginRegisterStRepo login;
    /**
     * 根据查询条件查询登录注册访问统计数据
     *
     * @param search
     * @return
     */
    @Override
    @GET
    @Path("login_reg")
    public List<LoginRegisterSt> getLoginRegSt(final BaseSearch search) {
        this.getDebugInfo();
        return login.getLoginRegsiterSt(search);
    }
}

解决办法

接口中添加相应的注解。

改正后的代码：

@Component("loginRegisterService")
@Path("statistics")
@Produces({ContentType.APPLICATION_JSON_UTF_8})
public class LoginRegisterServiceImpl implements LoginRegisterService {
    Log logger = LogFactory.getLog(LoginRegisterServiceImpl.class);

    @Resource
    private LoginRegisterStRepo login;
    /**
     * 根据查询条件查询登录注册访问统计数据
     *
     * @param search
     * @return
     */
    @Override
    @GET
    @Path("login_reg")
    public List<LoginRegisterSt> getLoginRegSt(@BeanParam final BaseSearch search) {
        this.getDebugInfo();
        return login.getLoginRegsiterSt(search);
    }
｝

3.java.io.EOFException: No content to map to Object due to end of input

错误日志

当请求一个rest服务api时，服务器报错：

java.io.EOFException: No content to map to Object due to end of input

错误原因

对于service的实现，接收参数没有注解为javax.ws.rs.* 类型之一，*包括：BeanParam和QueryParam,至于注解哪一种，需要根据情况而定，如果参数是Bean，用前者，是单个接收参数，用后者。

注意：这种错误出现时整个service没有注解，如果一个service中单个方法没有注解，则会出现#2的情况。

解决办法

加入上述相应的注解。

/**
     * 订单复购率订单数统计数据
     *
     * @param search
     * @return
     */
    @Override
    @GET
    @Path("reorder")
    public List<Map<String, Object>> getReOrder(@BeanParam final BaseSearch search) {
        return null;
    }

4.Due to limitations of the BasicDBObject, you can’t add a second ‘$and’

错误日志

首先这是一个mongodb的错误，暂且放到这里面。

java.lang.RuntimeException: org.springframework.data.mongodb.InvalidMongoDbApiUsageException: Due to limitations of the com.mongodb.BasicDBObject, you can't add a second '$and' expression specified as '$and : [ { "time" : { "$gte" : null }}]'. Criteria already contains '$and : [ { "appid" : { "$regex" : "fgdarr561puu" , "$options" : "i"}}]'.

错误原因

在一个Criteria实例中只能使用一次andOperator方法,而我这里使用了两次，因为appid和mobile都不为空。

if (share.getAppid() != null && StringUtils.isNotEmpty(share.getAppid())) {
                criteria.andOperator(Criteria.where("appid").regex(share.getAppid(), "i"));
if (share.getMobile() != null) {
   criteria.andOperator(Criteria.where("mobile").regex(share.getMobile(), "i"));

如果要使用过个字段的操作，请看mkyong的解决方法：

Problem

Using Spring data and Mongodb, below is a function to find data within a date range.

public List<RequestAudit> findByIpAndDate(String ip, Date startDate, Date endDate) {

    Query query = new Query(
        Criteria.where("ip").is(ip)
        .andOperator(Criteria.where("createdDate").gte(startDate))
        .andOperator(Criteria.where("createdDate").lt(endDate))
    );
                
    return mongoOperation.find(query, RequestAudit.class);

}

It hits following error message :

org.springframework.data.mongodb.InvalidMongoDbApiUsageException: 
    Due to limitations of the com.mongodb.BasicDBObject, you can't add a second '$and' 
    expression specified as '$and : [ { "createdDate" : { "$lt" : { "$date" : "2013-02-25T16:00:00.000Z"}}}]'. 
    Criteria already contains '$and : [ { "createdDate" : { "$gte" : { "$date" : "2013-02-24T16:00:00.000Z"}}}]'

### Solution
Adding multiple “$and” operators on the same field “createdDate” will make Spring interprets it into a wrong mongodb query. To fix it, change the query to follow :

Query query = new Query(
    Criteria.where("ip").is(ip)
    .andOperator(
        Criteria.where("createdDate").lt(endDate),
        Criteria.where("createdDate").gte(startDate)
    )
);

For multiple criteria on the same field, uses a “comma” to combine them.

解决方法

如果你的需要和mkyong的一样，可以使使用合并字段到andOperator()方法中，当然你可以使用and()方法，由于我这里要对参数过滤，选择使用and()操作。
扩展：类似的错误经常在我们判断的时间字段上，比如我们需要做开始时间和结束时间范围内的操作，此时我们是不是要判断开始时间和结束时间，如下：。

if (share.getStart() != null && share.getStart() != 0) {
    criteria.and("time").lt(share.getEnd());
}
if (share.getEnd() != null && share.getEnd() != 0) {
    criteria.and("time").gte(share.getStart());
}

这段代码也会报错，Criteria不允许同一字段多次出现在操作（and,andOperator,etc）中。
修改上述逻辑：

if (share.getStart() != null && share.getStart() != 0 && share.getEnd() != null && share.getEnd() != 0) {
    criteria.and("time").gte(share.getStart()).lt(share.getEnd());
} else if (share.getStart() != null && share.getStart() != 0 && (share.getEnd() == null || share.getEnd() == 0)) {
    criteria.and("time").lt(share.getEnd());
} else if ((share.getStart() == null || share.getStart() == 0) && share.getEnd() != null && share.getEnd() != 0) {
    criteria.and("time").gte(share.getStart());
}

6. java.net.SocketTimeoutException: connect timed out

错误日志

com.mongodb.MongoTimeoutException: Timed out after 30000 ms while waiting for a server that matches ReadPreferenceServerSelector{readPreference=primary}. Client view of cluster state is {type=UNKNOWN, servers=[{address=10.132.0.169:27017, type=UNKNOWN, state=CONNECTING, exception={com.mongodb.MongoSocketOpenException: Exception opening socket}, caused by {java.net.SocketTimeoutException: connect timed out}}]

错误原因

出现这类情况，大概有以下几种情况：

• mongo地址开启了bind_ip

• 操作系统开启了防火墙，shell可以连接，但是java程序不能连接

• 程序连接配置错误，比如ip，port

• 程序本身写法错误

解决办法

• 如果开启了bind_ip，请加入你的服务器ip地址到该配置，或者，如果没有必要的时候，配置成0.0.0.0，这样任意机器均可访问

• 具体请看这里：centos7防火墙导致java程序访问mongodb3.0.1时报错的问题

• 配置mongo的连接，仔细检查ip、port的配置，有时候会把169写成196类似的错误

• 程序错误，请修改bug在连接

7.Unable to create a Configuration, because no Bean Validation provider could be found.

错误日志

2016-08-15 13:54:30,369 [ConsumeMessageThread_1] WARN  cn.joyven.kuaidi.mq.consumer.ImportShipHandler - Failed to invoke the method ship in the service cn.joyven.test.api.OrderService. Tried 3 times of the providers [192.168.2.245:8091] (1/1) from the registry 127.0.0.1:2181 on the consumer 192.168.2.47 using the dubbo version 2.8.4. Last error is: Unable to create a Configuration, because no Bean Validation provider could be found. Add a provider like Hibernate Validator (RI) to your classpath.

错误原因

未知

解决办法

在stackover上看到了一个解决方案：http://stackoverflow.com/ques…
这里给出一个此类问题的确认方法：
在dubbo的xml配置中，直接使url配置直接访问dubbo服务，看是否能够正常使用，如果能够正常使用，则说明就是验证器的问题引起的。
一般情况我们是通过zk去注册中心订阅服务的，不需要url配置，但为了定位问题，如下配置（增加url配置）：

<dubbo:reference interface="cn.joyven.test.api.OrderService"  id="orderService" check="false" protocol="dubbo,rest" url="dubbo://192.168.2.245:8091"/>

gradle项目：在gradle.build中增加

compile 'org.hibernate:hibernate-validator:5.2.0.Final'

maven项目：在pom.xml中增加

<dependency>
    <groupId>org.hibernate</groupId>
    <artifactId>hibernate-validator</artifactId>
    <version>5.2.0.Final</version>
</dependency>