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Dmitry Maslennikov · Aug 26, 2016

I did not show how you made connection to the Caché, and looks like, your Java application has hardcoded login password which used to connect to server. 

so, I may only suggest, that you use code like this

Class.forName ("com.intersys.jdbc.CacheDriver").newInstance();
CacheDataSource ds = new CacheDataSource();
ds.setURL("jdbc:Cache://127.0.0.1:1972/SAMPLES");
Connection dbconn = ds.getConnection("_SYSTEM","SYS");

Last string is Caché login password, so you should use here user's login and password. Any works from your application should be with user's login.

Dmitry Maslennikov · Aug 24, 2016

UDL format is for classes only, and this format how that classes looks in Studio.

Export web files, available as any others in XML format with $system.OBJ.Export()

USER>d $system.OBJ.Export("/csp/user/*.*","export.xml")

Exporting to XML started on 08/24/2016 20:52:44
Exporting CSP/CSR or file: /csp/user/ML_Util.js
Exporting CSP/CSR or file: /csp/user/menu.csp
Exporting CSP/CSR or file: /csp/user/showsource.csp
Export finished successfully.

And all web files stores as files in the directory for this web-application, so you can get it directly, but native export/import works only in XML

Dmitry Maslennikov · Aug 18, 2016

Why do you name it macro ?
Maybe you mean MAC routine ?

I highly recommend to read this tutorial about CacheObjectScript

usually you can call routine by simple command

do ^routine

but sometime you need to call directly to concrete label in that routine

do label^routine()

but in this case if you use curly brace style, you should public such method in routine

label() public {
 write "Hello World!"
​}

or in old style

label()
 write "Hello world!"
 quit
Dmitry Maslennikov · Aug 17, 2016

So, you had to start with such explanation.

Well, does not matter what do you set in Accept header, if you don't use it by yourself. Like, you should check incoming content type and send an error if it is not accepted. This Header change nothing in incoming data,  if data was sent in another format.

To read data, you should know that %request has three different ways for getting data. You have already known in %request.Content, which usually contains binary streams. Then %request.MimeData, and %request.Data, it is a Multidimensional properties, and %request has some getters for them, %request.GetMimeData and %request.Get. MimeData, needs when client send data in multipart mime format, such as several files or so on. And %request.Data, in all most cases, and you should look at this property and method %request.Get("somename")

Dmitry Maslennikov · Aug 17, 2016

If you use %CSP.REST, you can set needed ContentType in any called method

XData UrlMap
{
<Routes>
  <Route Url="/text" Method="GET" Call="GetText" Cors="false" />
</Routes>
}

ClassMethod GetText() 
{
    set %response.ContentType="text/plain"
    
    write "test"
    
    quit $$$OK
}

and test

➜  ~ curl -v http://localhost:57774/api/app/text
*   Trying ::1...
* Connected to localhost (::1) port 57774 (#0)
> GET /api/ambulance/text HTTP/1.1
> Host: localhost:57774
> User-Agent: curl/7.49.1
> Accept: */*
>
< HTTP/1.1 200 OK
< Date: Wed, 17 Aug 2016 17:54:28 GMT
< Server: Apache
< CACHE-CONTROL: no-cache
< EXPIRES: Thu, 29 Oct 1998 17:04:19 GMT
< PRAGMA: no-cache
< CONTENT-LENGTH: 4
< Content-Type: text/plain; charset=utf-8
<
* Connection #0 to host localhost left intact
test%
Dmitry Maslennikov · Aug 17, 2016

Macro is $$$. Anyway, a little excerpt from documentation  

$
 

Dollar sign (36): Intrinsic (system) function prefix: $name(parameters).

Special variable prefix: $name.

$Znnn (a name beginning with $Z) can be a user-defined function or special variable defined using %ZLANG language extension library. It can also be an intrinsic (InterSystems supplied) function or special variable.

Regular expression end of string anchor; for example, (USA)$.

In ZBREAK debugging, a single-step breakpoint.

As first character at terminal prompt, load interactive subshell.

$$
 

Double dollar sign: Extrinsic (user-written) function prefix: $$name(parameters). $$ is returned by $STACK when context was established by an extrinsic function reference.

Prefix to a routine name to directly invoke that routine.

$$$ Triple dollar sign: Macro invocation prefix.