Netty: java.lang.UnsupportedOperationException: direct buffer

[esfomeado]

Hi,

I'm having the following problem on netty 4.1.0.CR7:
java.lang.UnsupportedOperationException: direct buffer
at io.netty.buffer.PooledUnsafeDirectByteBuf.array(PooledUnsafeDirectByteBuf.java:343)
at io.netty.buffer.SwappedByteBuf.array(SwappedByteBuf.java:916)

With this code (works fine on other versions):
return new String(msg.readBytes(strLength).array());

msg is a ByteBuf

[normanmaurer]

That is because its a direct buffer and so hasArray() returns false. This is expected as stated in the javadocs

[zhaoxi1988]

I upgrade netty-all-4.0.36.Final to 4.1.0.Final so that meet the problem.

[esfomeado]

@normanmaurer How do i get a byte[] from a ByteBuffer now since array(); gives this error?

Thanks

[Scottmitch]

The ByteBuf interface offers readBytes(byte[] dst); and getBytes(int index, byte[] dst); which will copy the data to a byte[] if that is what you need. See the javadocs in ByteBuf for more info.

[gotev]

If you use kotlin you can make an extension and use that instead

fun ByteBuf.toByteArraySafe(): ByteArray {
    if (this.hasArray()) {
        return this.array()
    }

    val bytes = ByteArray(this.readableBytes())
    this.getBytes(this.readerIndex(), bytes)

    return bytes
}

[vainly]

Hi, you can use that instead
new String(ByteBufUtil.getBytes(buf), Charset.forName("UTF-8"))