- [x] I have searched the [issues](https://github.com/apache/dubbo/issues) of this repository and believe that this is not a duplicate.
- [x] I have checked the [FAQ](https://github.com/apache/dubbo/blob/master/FAQ.md) of this repository and believe that this is not a duplicate.

### Environment

* Dubbo version: 2.7.3
* Operating System version: Mac
* Java version: 1.8

### Steps to reproduce this issue

1.  `org/apache/dubbo/registry/support/ProviderConsumerRegTable.java:65` Type 'ProviderInvokerWrapper<>' does not define hashCode(), but is used in a hashing data-structure.
2. Class overrides equals but not hashCode.
* org.apache.dubbo.config.AbstractConfig
* org.apache.dubbo.registry.support.ProviderInvokerWrapper
* org.apache.dubbo.remoting.buffer.AbstractChannelBuffer

Pls. provide [GitHub address] to reproduce this issue.

### Expected Result

Whether the above suggestions can be fixed or have other considerations

### Actual Result

Is it considered a bug? Will it fix?

}
        return new HeapChannelBuffer(array);
    }
    public static ChannelBuffer wrappedBuffer(ByteBuffer buffer) {
        if (!buffer.hasRemaining()) {
            return EMPTY_BUFFER;
        }
        if (buffer.hasArray()) {
            return wrappedBuffer(buffer.array(), buffer.arrayOffset() + buffer.position(), buffer.remaining());
        } else {
            return new ByteBufferBackedChannelBuffer(buffer);
        }
    }
    public static ChannelBuffer directBuffer(int capacity) {
        if (capacity == 0) {
            return EMPTY_BUFFER;
        }
        ChannelBuffer buffer = new ByteBufferBackedChannelBuffer(
                ByteBuffer.allocateDirect(capacity));
        buffer.clear();
        return buffer;
    }
    public static boolean equals(ChannelBuffer bufferA, ChannelBuffer bufferB) {
        final int aLen = bufferA.readableBytes();
        if (aLen != bufferB.readableBytes()) {
            return false;
        }
        final int byteCount = aLen & 7;
        int aIndex = bufferA.readerIndex();
        int bIndex = bufferB.readerIndex();