[jboss-jira] [JBoss JIRA] (AS7-4126) double values cannot be read from dmr response

[Rob Cernich (JIRA)]

    [ https://issues.jboss.org/browse/AS7-4126?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12761643#comment-12761643 ] 

Rob Cernich commented on AS7-4126:
----------------------------------

I recommend changing the signature to use JsArrayInteger, as this works in both dev and production modes.  The current input can easily be converting using JsArrayUtils.readOnlyJsArray(doubleBytes).
                
> double values cannot be read from dmr response
> ----------------------------------------------
>
>                 Key: AS7-4126
>                 URL: https://issues.jboss.org/browse/AS7-4126
>             Project: Application Server 7
>          Issue Type: Bug
>          Components: Console
>    Affects Versions: 7.1.0.Final
>            Reporter: Rob Cernich
>            Assignee: Heiko Braun
>             Fix For: 7.1.2.Final (EAP)
>
>
> This appears to be a bug in the GWT compiler.  The compiler turns the following:
> {code:java|title=DataInput.readDouble()}
> return IEEE754.toDouble(bytes[pos++], bytes[pos++], bytes[pos++], bytes[pos++], bytes[pos++], bytes[pos++], bytes[pos++], bytes[pos++]);
> {code}
> into: (effectively; the GWT compiler is adding a set of parentheses around the parameters passed to the native function)
> {code:java|title=DataInput.readDouble() compiled}
> return IEEE754.toDouble(new byte[] {bytes[pos++], bytes[pos++], bytes[pos++], bytes[pos++], bytes[pos++], bytes[pos++], bytes[pos++], bytes[pos++]});
> {code}
> This results in all double values in the model being interpreted as NaN.
> I've patched the code I'm using in SwitchYard as follows:
> {code:java|title=DataInput.java}
> public double readDouble() throws IOException {
>     byte doubleBytes[] = new byte[8];
>     readFully(doubleBytes);
>     return IEEE754.toDouble(doubleBytes);
> }
> {code}
> {code:java|title=IEEE754.java}
> public static native double toDouble(byte[] bytes) /*-{
>     var ebits = 11;
>     var fbits = 52;
>     // Bytes to bits
>     var bits = [];
>     //snip...
> }
> {code}

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