yangxujia
commented
7 years ago Closed yangxujia closed 6 years ago
yangxujia
commented
7 years ago 
chickenlj
commented
7 years ago 根据堆栈错误应该发生在反序列化阶段，发序列化调用构造函数生成示例抛NPE。检查一下DTO相关的类，构造函数有没有包含处理逻辑的，有没有可能会抛出异常？
miniFrank
commented
7 years ago +1
miniFrank
commented
7 years ago c.e.a.ControllerMethodTimeActive - URL调用异常. 方法:com.edol.sale.web.GoodsV2Controller#queryPromotionPage, 入参:[EdolRequest(campusId=null, areaId=672687, orgId=268, adminId=null, userId=11789258, userNo=09da17e232834aa05cbbef52f0fbb238e86a7771, deviceNo=400e3066-6062-4bb2-bd2a-50a578d74817, deviceName=iPhone6sPlus, appVersion=IOS_4.0.3, requestIp=null, device_no=null, app_version=IOS_4.0.3, deviceId=null, ip=null, isMiniApp=null)]
java.lang.NullPointerException: null
at sun.reflect.GeneratedConstructorAccessor318.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
at com.alibaba.com.caucho.hessian.io.JavaDeserializer.instantiate(JavaDeserializer.java:271)
at com.alibaba.com.caucho.hessian.io.JavaDeserializer.readObject(JavaDeserializer.java:155)
at com.alibaba.com.caucho.hessian.io.SerializerFactory.readObject(SerializerFactory.java:523)
at com.alibaba.com.caucho.hessian.io.Hessian2Input.readObjectInstance(Hessian2Input.java:2070)
at com.alibaba.com.caucho.hessian.io.Hessian2Input.readObject(Hessian2Input.java:2005)
at com.alibaba.com.caucho.hessian.io.Hessian2Input.readObject(Hessian2Input.java:1990)
at com.alibaba.dubbo.common.serialize.support.hessian.Hessian2ObjectInput.readObject(Hessian2ObjectInput.java:88)
at com.alibaba.dubbo.rpc.protocol.dubbo.DecodeableRpcResult.decode(DecodeableRpcResult.java:104)
at com.alibaba.dubbo.rpc.protocol.dubbo.DecodeableRpcResult.decode(DecodeableRpcResult.java:121)
at com.alibaba.dubbo.rpc.protocol.dubbo.DubboCodec.decodeBody(DubboCodec.java:97)
at com.alibaba.dubbo.remoting.exchange.codec.ExchangeCodec.decode(ExchangeCodec.java:145)
at com.alibaba.dubbo.remoting.exchange.codec.ExchangeCodec.decode(ExchangeCodec.java:91)
at com.alibaba.dubbo.rpc.protocol.dubbo.DubboCountCodec.decode(DubboCountCodec.java:67)
at com.alibaba.dubbo.remoting.transport.netty.NettyCodecAdapter$InternalDecoder.messageReceived(NettyCodecAdapter.java:134)
at org.jboss.netty.channel.SimpleChannelUpstreamHandler.handleUpstream(SimpleChannelUpstreamHandler.java:70)
at org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:564)
at org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:559)
at org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:268)
at org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:255)
at org.jboss.netty.channel.socket.nio.NioWorker.read(NioWorker.java:88)
at org.jboss.netty.channel.socket.nio.AbstractNioWorker.process(AbstractNioWorker.java:108)
at org.jboss.netty.channel.socket.nio.AbstractNioSelector.run(AbstractNioSelector.java:337)
at org.jboss.netty.channel.socket.nio.AbstractNioWorker.run(AbstractNioWorker.java:89)
at org.jboss.netty.channel.socket.nio.NioWorker.run(NioWorker.java:178)
at org.jboss.netty.util.ThreadRenamingRunnable.run(ThreadRenamingRunnable.java:108)
at org.jboss.netty.util.internal.DeadLockProofWorker$1.run(DeadLockProofWorker.java:42)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
footmanFF
commented
6 years ago 
footmanFF
commented
6 years ago +1
jason8888888
commented
6 years ago java.lang.ArithmeticException
at sun.reflect.GeneratedConstructorAccessor62.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
at com.alibaba.com.caucho.hessian.io.JavaDeserializer.instantiate(JavaDeserializer.java:305)
at com.alibaba.com.caucho.hessian.io.JavaDeserializer.readObject(JavaDeserializer.java:194)
at com.alibaba.com.caucho.hessian.io.SerializerFactory.readObject(SerializerFactory.java:481)
at com.alibaba.com.caucho.hessian.io.Hessian2Input.readObjectInstance(Hessian2Input.java:2743)
at com.alibaba.com.caucho.hessian.io.Hessian2Input.readObject(Hessian2Input.java:2683)
at com.alibaba.com.caucho.hessian.io.Hessian2Input.readObject(Hessian2Input.java:2657)
at com.alibaba.dubbo.common.serialize.support.hessian.Hessian2ObjectInput.readObject(Hessian2ObjectInput.java:76)
at com.alibaba.dubbo.rpc.protocol.dubbo.DecodeableRpcResult.decode(DecodeableRpcResult.java:92)
at com.alibaba.dubbo.rpc.protocol.dubbo.DecodeableRpcResult.decode(DecodeableRpcResult.java:109)
at com.alibaba.dubbo.rpc.protocol.dubbo.DubboCodec.decodeBody(DubboCodec.java:90)
at com.alibaba.dubbo.remoting.exchange.codec.ExchangeCodec.decode(ExchangeCodec.java:118)
at com.alibaba.dubbo.remoting.exchange.codec.ExchangeCodec.decode(ExchangeCodec.java:79)
at com.alibaba.dubbo.rpc.protocol.dubbo.DubboCountCodec.decode(DubboCountCodec.java:46)
at com.alibaba.dubbo.remoting.transport.netty.NettyCodecAdapter$InternalDecoder.messageReceived(NettyCodecAdapter.java:134)
at org.jboss.netty.channel.SimpleChannelUpstreamHandler.handleUpstream(SimpleChannelUpstreamHandler.java:80)
at org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:564)
at org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:559)
at org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:274)
at org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:261)
at org.jboss.netty.channel.socket.nio.NioWorker.read(NioWorker.java:349)
at org.jboss.netty.channel.socket.nio.NioWorker.processSelectedKeys(NioWorker.java:280)
at org.jboss.netty.channel.socket.nio.NioWorker.run(NioWorker.java:200)
at org.jboss.netty.util.ThreadRenamingRunnable.run(ThreadRenamingRunnable.java:108)
at org.jboss.netty.util.internal.DeadLockProofWorker$1.run(DeadLockProofWorker.java:44)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
imsunv
commented
6 years ago use -XX:-OmitStackTraceInFastThrow can solve such exception without stack trace.
ralf0131
commented
6 years ago Hi, can you provide an example to reproduce this issue?
ralf0131
commented
6 years ago Please check the link provided in @chickenlj 's comments.
I am going to close this issue, feel free to reopen it if it still exists.
zhaixiaoxiang
commented
6 years ago @chickenlj @ralf0131 大佬们
我们还是有这个问题,偶现的,帖子里面说的加上默认构造方法也试过了,还是偶现有问题
java.lang.NullPointerException: null at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) at java.lang.reflect.Constructor.newInstance(Constructor.java:423) at com.alibaba.com.caucho.hessian.io.JavaDeserializer.instantiate(JavaDeserializer.java:271) at com.alibaba.com.caucho.hessian.io.JavaDeserializer.readObject(JavaDeserializer.java:155) at com.alibaba.com.caucho.hessian.io.SerializerFactory.readObject(SerializerFactory.java:397) at com.alibaba.com.caucho.hessian.io.Hessian2Input.readObjectInstance(Hessian2Input.java:2070) at com.alibaba.com.caucho.hessian.io.Hessian2Input.readObject(Hessian2Input.java:2005) at com.alibaba.com.caucho.hessian.io.Hessian2Input.readObject(Hessian2Input.java:1990) at com.alibaba.dubbo.common.serialize.support.hessian.Hessian2ObjectInput.readObject(Hessian2ObjectInput.java:88) at com.alibaba.dubbo.rpc.protocol.dubbo.DecodeableRpcResult.decode(DecodeableRpcResult.java:92) at com.alibaba.dubbo.rpc.protocol.dubbo.DecodeableRpcResult.decode(DecodeableRpcResult.java:109) at com.alibaba.dubbo.rpc.protocol.dubbo.DubboCodec.decodeBody(DubboCodec.java:97) at com.alibaba.dubbo.remoting.exchange.codec.ExchangeCodec.decode(ExchangeCodec.java:129) at com.alibaba.dubbo.remoting.exchange.codec.ExchangeCodec.decode(ExchangeCodec.java:90) at com.alibaba.dubbo.rpc.protocol.dubbo.DubboCountCodec.decode(DubboCountCodec.java:46) at com.alibaba.dubbo.remoting.transport.netty.NettyCodecAdapter$InternalDecoder.messageReceived(NettyCodecAdapter.java:134) at org.jboss.netty.channel.SimpleChannelUpstreamHandler.handleUpstream(SimpleChannelUpstreamHandler.java:70) at org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:564) at org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:559) at org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:268) at org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:255) at org.jboss.netty.channel.socket.nio.NioWorker.read(NioWorker.java:88) at org.jboss.netty.channel.socket.nio.AbstractNioWorker.process(AbstractNioWorker.java:108) at org.jboss.netty.channel.socket.nio.AbstractNioSelector.run(AbstractNioSelector.java:337) at org.jboss.netty.channel.socket.nio.AbstractNioWorker.run(AbstractNioWorker.java:89) at org.jboss.netty.channel.socket.nio.NioWorker.run(NioWorker.java:178) at org.jboss.netty.util.ThreadRenamingRunnable.run(ThreadRenamingRunnable.java:108) at org.jboss.netty.util.internal.DeadLockProofWorker$1.run(DeadLockProofWorker.java:42) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at java.lang.Thread.run(Thread.java:745)
我们的DTO如下:
`
@Setter
@Getter
@ToString
public class ModelPriceDTO extends BaseModelDTO implements Serializable {
private static final long serialVersionUID = 3714041108118216990L;
/**
* 官方指导价(元)
*/
private Integer guidePrice;
/**
* 经销商指导价(元)
*/
private Integer dealerPrice;
/**
* 平均价格(元)
*/
private Integer avgPrice;
/**
* 购置税(元)
*/
private Integer purchase;
/**
* 价格别名
*/
private String alias;
public ModelPriceDTO() {
}
public ModelPriceDTO(String modelCode) {
super.setModelCode(modelCode);
}}
BaseModelDTO如下:
@Setter
@Getter
@ToString
public abstract class BaseModelDTO {
/**
* 车型编码
*/
private String modelCode;} `
bert82503
commented
5 years ago @yangxujia @miniFrank @footmanFF @zhaixiaoxiang
我们在生产环境也遇到这个问题，其实问题根源是提供者报了大量的 NPE 异常，JVM 为了性能会做优化，如果频繁地抛出某个异常，会重新编译，不再打印异常堆栈。 这样提供者端会发现看不到异常的stackTrace：
java.lang.NullPointerException: null提供者返回：RpcResult {"result":null,"exception":java.lang.NullPointerException(null)实例}。
而消费者使用的Hessian2在反序列化时使用Constructor.newInstance()反射构造异常实例：
protected Object instantiate()
throws Exception {
try {
if (_constructor != null)
// 通过构造器反射实例化异常实例
return _constructor.newInstance(_constructorArgs);
else
return _type.newInstance();
} catch (Exception e) {
throw new HessianProtocolException("'" + _type.getName() + "' could not be instantiated", e);
}
}
// 实例化异常对象
public NullPointerException() {
super();
}
public RuntimeException() {
super();
}
public Exception() {
super();
}
public Throwable() {
fillInStackTrace();
}
public synchronized Throwable fillInStackTrace() {
if (stackTrace != null ||
backtrace != null /* Out of protocol state */ ) {
fillInStackTrace(0);
stackTrace = UNASSIGNED_STACK;
}
return this;
}
// 因为提供者返回的NPE异常信息为null，结果正好使用了Java异常初始化堆栈跟踪StackTrace。结果我们看到的是假的调用堆栈跟踪
private native Throwable fillInStackTrace(int dummy);
因为提供者返回的NPE异常信息为null，结果正好使用了Java异常初始化堆栈跟踪StackTrace。结果我们看到的是假的调用堆栈跟踪，很凑巧。
zhaixiaoxiang
commented
5 years ago Hi, can you provide an example to reproduce this issue?
Hi, This demo can recur this issue: https://github.com/zhaixiaoxiang/dubbo-examples/tree/master/hessian-npe-demo. And this is my analysis for this issue: https://www.yuque.com/fa902k/id5z6r/sr041v
bert82503
commented
5 years ago Hi, can you provide an example to reproduce this issue?
Hi, This demo can recur this issue: https://github.com/zhaixiaoxiang/dubbo-examples/tree/master/hessian-npe-demo. And this is my analysis for this issue: https://www.yuque.com/fa902k/id5z6r/sr041v
我确实只列出了关键点，但你的文章很棒👍，非常细致完整地分析。你的第5步之后，我就没再代码走读下去。 @zhaixiaoxiang