io.netty.handler.codec.DefaultHeaders.remove(DefaultHeaders.java 1074) java.lang.NullPointerException : Cannot read field ""hash"" because ""e"" is null #14159

jeffcf · 2024-07-03T14:15:15Z

jeffcf
Jul 3, 2024

I have a question and I want to ask an expert.
When I use SpringBoot webflux, I sometimes get the following error:

Exception :
io.netty.handler.codec.DefaultHeaders.remove0(DefaultHeaders.java 1074) java.lang.NullPointerException : Cannot read field ""hash"" because ""e"" is null

Env:
SpringBoot 3.2 with WebFlux
netty-codec-4.1.109Final.jar

DefaultHeaders.java SourceCode

/**
 * @return the first value inserted whose hash code equals {@code h} and whose name is equal to {@code name}.
 */
private V remove0(int h, int i, K name) {
    HeaderEntry<K, V> e = entries[i];
    if (e == null) {
        return null;
    }

    V value = null;
    HeaderEntry<K, V> next = e.next;
    while (next != null) {
        if (next.hash == h && hashingStrategy.equals(name, next.key)) {
            value = next.value;
            e.next = next.next;
            next.remove();
            --size;
        } else {
            e = next;
        }

        next = e.next;
    }

    e = entries[i];
    if (e.hash == h && hashingStrategy.equals(name, e.key)) {      // <-------------------1074 Exception Line
        if (value == null) {
            value = e.value;
        }
        entries[i] = e.next;
        e.remove();
        --size;
    }

    return value;
}

It"s hard for me to reproduce this error, it happens occasionally

Has anyone encountered this error?
thank you all.

jeffcf · 2024-07-08T13:35:03Z

jeffcf
Jul 8, 2024
Author

Now there is a new discovery that this bug can be reproduced when the http header has Except:100-continue.

Use .net http client or jmeter to perform a stress test. Netty NPE errors will appear in about 2-5 minutes.

By default, the ".net" http client will contain Except: in the http header Except:100-continue.

( PS: .net core does not have this http header by default)

0 replies

normanmaurer · 2024-07-08T13:38:45Z

normanmaurer
Jul 8, 2024
Maintainer

I wonder if you might send the same HttpObject down the pipeline without duplicating it ?

0 replies

jeffcf · 2024-07-09T00:55:23Z

jeffcf
Jul 9, 2024
Author

Hi normanmaurer,

The two methods testing are as follows

JMeter --> .net http api --> netty server
JMeter --> netty server

Http Object should be unique.

The same test method,when I remove Except:100-Contine, this error will not occur.

Thanks

0 replies

normanmaurer · 2024-07-12T13:13:52Z

normanmaurer
Jul 12, 2024
Maintainer

@violetagg can you check... for me it looks like the same object might be shared across threads.

0 replies

violetagg · 2024-07-12T13:35:54Z

violetagg
Jul 12, 2024
Collaborator

@jeffcf @normanmaurer Without some example code it is hard to say. We have fixes related to Except:100-Continue handling, but here it is not obvious the version of Reactor Netty.

0 replies

jeffcf · 2024-07-15T12:52:32Z

jeffcf
Jul 15, 2024
Author

@violetagg

SpringBoot 3.2 with WebFlux
netty-codec-4.1.109Final.jar

io.netty.handler.codec.DefaultHeaders.remove0(DefaultHeaders.java 1074) java.lang.NullPointerException : Cannot read field ""hash"" because ""e"" is null

pom.xml

maven depency

Thanks

2 replies

violetagg Jul 15, 2024
Collaborator

Spring Boot 3.2.5 comes with Reactor Netty 1.1.18 (io.projectreactor.netty:reactor-netty-http) which mean you have all fixes related to Expect. Can you provide some example code?

jeffcf Jul 16, 2024
Author

@violetagg

If I don"t need the Except 100-continue feature, is there a way to turn it off directly and avoid this error?

I retested and made my example code simpler.

sample code as attachments (Java Maven Project)

new-netty-gw.zip

startup springboot netty-gw instances

8080 port for test endpoint http://127.0.0.1:8080/rest (update application.yml server:port:8080)

use jmeter call http://127.0.0.1:8080/rest

http header
--> Expect: 100-continue

http body
{
"HEADER" : {
"APID": "XX",
"APID": "XX"
},
"BODY" : {
"BOOK_NAME" : "test"
}
}

error log

Thanks

jeffcf · 2024-07-21T11:02:43Z

jeffcf
Jul 21, 2024
Author

@violetagg
I"m sorry to bother you. I have attached the test code to the discussion stream. I would like your help to see if I can find the problem.

thank you

3 replies

violetagg Jul 22, 2024
Collaborator

@jeffcf What are your exact configurations for the Thread Group?

violetagg Jul 22, 2024
Collaborator

Actually I might have an idea ... Can you open an issue here https://github.com/reactor/reactor-netty/issues

jeffcf Jul 22, 2024
Author

@violetagg
What are your exact configurations for the Thread Group?
----> Default value, no special setting Thread Group

Actually I might have an idea ... Can you open an issue here https://github.com/reactor/reactor-netty/issues
---> OK
---> reactor/reactor-netty#3363

violetagg · 2024-07-23T09:27:34Z

violetagg
Jul 23, 2024
Collaborator

@normanmaurer We are sure that the object is new (no reuse), in the picture below (provided by @jeffcf),

1 reply

violetagg Jul 23, 2024
Collaborator

@normanmaurer Please ignore the comment above. It seems that the fix in Reactor Netty is working as expected.

normanmaurer · 2024-07-23T21:42:17Z

normanmaurer
Jul 23, 2024
Maintainer

Have an link ?Am 23.07.2024 um 08:29 schrieb Violeta Georgieva ***@***.***>: @normanmaurer Please ignore the comment above. It seems that the fix in Reactor Netty is working as expected. —Reply to this email directly, view it on GitHub, or unsubscribe.You are receiving this because you were mentioned.Message ID: ***@***.***>

1 reply

violetagg Jul 24, 2024
Collaborator

reactor/reactor-netty#3363

Provide feedback

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io.netty.handler.codec.DefaultHeaders.remove(DefaultHeaders.java 1074) java.lang.NullPointerException : Cannot read field ""hash"" because ""e"" is null #14159

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io.netty.handler.codec.DefaultHeaders.remove(DefaultHeaders.java 1074) java.lang.NullPointerException : Cannot read field ""hash"" because ""e"" is null #14159

jeffcf Jul 3, 2024

I have a question and I want to ask an expert. When I use SpringBoot webflux, I sometimes get the following error:

Env: SpringBoot 3.2 with WebFlux netty-codec-4.1.109Final.jar

Replies: 9 comments · 7 replies

jeffcf Jul 8, 2024 Author

normanmaurer Jul 8, 2024 Maintainer

jeffcf Jul 9, 2024 Author

normanmaurer Jul 12, 2024 Maintainer

violetagg Jul 12, 2024 Collaborator

jeffcf Jul 15, 2024 Author

violetagg Jul 15, 2024 Collaborator

jeffcf Jul 16, 2024 Author

use jmeter call http://127.0.0.1:8080/rest

jeffcf Jul 21, 2024 Author

violetagg Jul 22, 2024 Collaborator

violetagg Jul 22, 2024 Collaborator

jeffcf Jul 22, 2024 Author

violetagg Jul 23, 2024 Collaborator

violetagg Jul 23, 2024 Collaborator

normanmaurer Jul 23, 2024 Maintainer

violetagg Jul 24, 2024 Collaborator

jeffcf
Jul 3, 2024

I have a question and I want to ask an expert.
When I use SpringBoot webflux, I sometimes get the following error:

Env:
SpringBoot 3.2 with WebFlux
netty-codec-4.1.109Final.jar

Replies: 9 comments 7 replies

jeffcf
Jul 8, 2024
Author

normanmaurer
Jul 8, 2024
Maintainer

jeffcf
Jul 9, 2024
Author

normanmaurer
Jul 12, 2024
Maintainer

violetagg
Jul 12, 2024
Collaborator

jeffcf
Jul 15, 2024
Author

violetagg Jul 15, 2024
Collaborator

jeffcf Jul 16, 2024
Author

jeffcf
Jul 21, 2024
Author

violetagg Jul 22, 2024
Collaborator

violetagg Jul 22, 2024
Collaborator

jeffcf Jul 22, 2024
Author

violetagg
Jul 23, 2024
Collaborator

violetagg Jul 23, 2024
Collaborator

normanmaurer
Jul 23, 2024
Maintainer

violetagg Jul 24, 2024
Collaborator