Re: Calling methods on Uint8Array is causing a ReferenceError in Super Dev Mode...

I face similar problem, trying to use ArrayBuffer and Uint8Array. JDK 17, GWT 2.12.1, Windows workstation

My original intent was to return bytes of user-selected file from JSNI to GWT code. But now I see even simplest pure GWT java code doesn't work. 

I create ArrayBuffer, then create Uint8Array from it.

Any Uint8Array methods except toString() fail with ReferenceError. I see "devirtual" there, may it give a clue...

I probably do something wrong but I cannot find any example in the internet.

ArrayBuffer arrayBuffer = TypedArrays.createArrayBuffer(20);

GWT.log("ab.length = " + arrayBuffer.byteLength());

Uint8Array uintArray = TypedArrays.createUint8Array(arrayBuffer);

GWT.log("uintArray = " + uintArray);

// ---------- THE CALL BELOW FAILS ---------

GWT.log("uintArray[0] " + uintArray.get(0));

ab.length = 20
uintArray = 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
SEVERE ****MYAPP**** Exception: com.google.gwt.core.client.JavaScriptException: (ReferenceError) : com_google_gwt_typedarrays_client_Uint8ArrayNative_get_1I_1S_1_1devirtual$__Lcom_google_gwt_typedarrays_shared_Uint8Array_2IS is not defined
at Unknown. ***MYAPP*** _testArrayBuffer__V(***MYAPP***-0.js@3:260605)
at ....

--------------

JDK 17

GWT 2.12.1

Code server Command line:

Run GWT Code Server: [-launcherDir, C:\home\ws\MYAPP\.metadata\.plugins\org.eclipse.wst.server.core\tmp0/wtpwebapps/MYAPP, -workDir, MYTMPDIR, -logLevel, INFO, -style, DETAILED, -sourceLevel, 17, -port, 9876, -generateJsInteropExports, MYAPPNAME]

On Saturday, November 11, 2017 at 8:11:08 PM UTC+1 Colin Alworth wrote:

Can you run super dev mode with `-style PRETTY`? The line you are pointing at should only error out like that if createUint8Array returned null, but it would be good to confirm that in PRETTY you see the name of the local variable.

.byteLength() in the native code is just defined as access on the .byteLength field of the view, so that seems sane enough - should only error out of there is no Uint8Array. But createUint8Array should just delegate to Uint8ArrayNative.create(buffer, 0, buffer.byteLength()) anyway, which just calls the JS constructor, so that doesn't make a ton of sense either...

Try PRETTY, and maybe turn off sourcemaps so you can see what is generated - perhaps there is a bug and SDM is making a mistake, or maybe something else will be clear to you once you see the sources (probably in your own JSNI).

Finally, which version of GWT are you using?

On Wednesday, November 8, 2017 at 7:58:09 PM UTC-6, TimOnGmail wrote:

Hmmm, nope - even if I make a copy of the buffer, I still get the above error in Super Dev mode.

Any ideas, anyone?

- Tim

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