原因解决方法
错误异常
我们在使用Netty过程中是不是经常遇到如下异常：
io
.netty
.util
.IllegalReferenceCountException
: refCnt
: 0, increment
: 1
at io
.netty
.buffer
.AbstractReferenceCountedByteBuf
.release0(
AbstractReferenceCountedByteBuf
.java
:100)
...
原因
SimpleChannelInboundHandler 它会自动进行一次释放(即引用计数减1). 源码如下:
@Override
public void channelRead(ChannelHandlerContext ctx
,
Object msg
) throws Exception
{
boolean release
= true;
try {
if (acceptInboundMessage(msg
)) {
@SuppressWarnings("unchecked")
I imsg
= (I
) msg
;
channelRead0(ctx
, imsg
);
} else {
release
= false;
ctx
.fireChannelRead(msg
);
}
} finally {
if (autoRelease
&& release
) {
ReferenceCountUtil
.release(msg
);
}
}
}
解决办法
((FullHttpRequest) msg).retain();调用 msg.retain() 方法进行手动计数器加1
