Netty io.netty.buffer.ByteBuf.array() throws exception - direct buffer

Question

I wanted to print io.netty.buffer.ByteBuf as string. But io.netty.buffer.ByteBuf.array() throws exception as follows.

java.lang.UnsupportedOperationException: direct buffer at io.netty.buffer.PooledUnsafeDirectByteBuf.array(PooledUnsafeDirectByteBuf.java:343)

Could some one help me to get the byte[] from byte io.netty.buffer.ByteBuf.

Thanks.

mac · Accepted Answer · 2018-10-05 06:19:05Z

3

OK, I have figured out a way to print the values. If anyone is interested,

byte[] bytes = new byte[buf.readableBytes()];
buf.duplicate().readBytes(bytes);
System.out.println(new String(bytes));

answered Oct 5, 2018 at 6:19

mac

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Comments

Nicholas · Accepted Answer · 2018-10-05 10:00:16Z

2

To print the contents of a ByteBuf as a string, you can use buf.toString(java.nio.charset.Charset).

answered Oct 5, 2018 at 10:00

Nicholas

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samthebest · Accepted Answer · 2023-08-25 13:01:38Z

0

Netty has a method for this

io.netty.buffer.ByteBufUtil.hexDump(buf)

answered Aug 25, 2023 at 13:01

samthebest

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