3 - Dynamic Proxy Layer on Apache Dubbo

3-1 - Failed to convert the address into Invoker

Mon, 01 Jan 0001 00:00:00 +0000

Possible Causes

The protocol configured on the client does not match the protocol configured on the server. (For example, if the protocol configured on the client is Dubbo, but the server can only provide Rest protocol services.)
The registry center (or configuration center) is unreliable and has pushed invalid data.

Troubleshooting and Resolution Steps

Check the protocol configuration on both the provider and consumer sides.
Update the version of the registry center.

3-2 - Failed to publish or push service

Mon, 01 Jan 0001 00:00:00 +0000

Possible Reasons

The registry center is unreachable.
The registry center is unable to provide services externally.

Troubleshooting and Resolution Steps

Check if the service network to the registry center is normal.
Verify whether the registry center has started normally and can be connected using third-party tools.
Confirm if there are any version compatibility issues between the service reference and the registry center’s version.

3-3 - Failure to generate bytecode through Javassist

Mon, 01 Jan 0001 00:00:00 +0000

Possible Reasons

The meaning of this error code has been adjusted. For errors with this error code in Dubbo versions 3.1.4, 3.2.0-beta.3, and earlier, please refer to error code 3-8.

Troubleshooting and Resolution Steps

(This error code is currently vacant)

3-4 - Client request timeout

Mon, 01 Jan 0001 00:00:00 +0000

Possible Causes

The client has too many connections, causing slow response times and unable to timely send requests to the server.
Some network issues.

Troubleshooting and Resolution Steps

Check if the network is functioning properly.
You can analyze stack information using some third-party tools or jstack [PID] > jstack.log for diagnostics.

3-5 - Asynchronous response raises exceptions

Mon, 01 Jan 0001 00:00:00 +0000

Possible Causes

There is indeed a runtime exception in the business logic.
Network issues, such as connection being refused.

Troubleshooting and Resolution Steps

Please trace back based on the stack trace prompt line to locate and investigate the business code.
Check if the network of the service provider is functioning properly.

3-6 - Proxy execution service encountered an exception

Mon, 01 Jan 0001 00:00:00 +0000

Possible Causes

The current service parameter shows the input parameter deprecated.
A generic declared class may trigger this warning.

Troubleshooting and Resolution Steps

Check if the URL contains the input parameter deprecated=true
If this error occurs in a generic declared class, it will attempt to create a proxy without an actual interface class.

3-7 - Server response result timeout

Mon, 01 Jan 0001 00:00:00 +0000

The server did not receive a response within the time set by the client.

Possible Reasons

The server’s business processing logic is too complex to respond within the effective time.
The connection between the server and client is disconnected, causing network packet loss.
The server is under heavy load.

Troubleshooting and Resolution Steps

Check if there is indeed a performance bottleneck in the server’s business processing capability.
Ensure the network is functioning normally.
You can analyze stack information using some third-party tools or jstack [PID] > jstack.log for diagnosis.

3-8 - Proxy Failure

Mon, 01 Jan 0001 00:00:00 +0000

Dynamic proxy creation failed.

Possible Causes

Dynamic class loading exists
Abnormal class format

Troubleshooting and Resolution Steps

If the logs indicate Fallback to use JDK proxy success, it means that Dubbo successfully created the dynamic proxy by falling back to the JDK proxy. If the program runs normally, this can be ignored.
If the logs indicate Fallback to use JDK proxy is also failed, please check the corresponding class loading situation based on the exception stack trace to ensure it is normal. You can use tools like Arthas for assistance in troubleshooting.